Timers & Real-Time Clocks

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Manufacturers
    • Ablic
    • Abracon
    • Analog Devices
    • Dallas Semiconductor
    • Diodes Incorporated
    • Epson Toyocom
    • Fairchild Semiconductor
    • Fox Electronics
    • Fujitsu
    • Hitachi
    • IXYS Corporation
    • Infineon Technologies
    • Intel
    • Intersil
    • Lapis Semiconductor
    • Maxim Integrated
    • Micro Crystal Ag
    • Microchip Technology
    • Motorola
    • NXP Semiconductors
    • National Semiconductor
    • Oki Electric Industry
    • Onsemi
    • Philips Semiconductors
    • ROHM
    • Renesas Electronics
    • Rochester Electronics
    • STMicroelectronics
    • Samsung
    • Seiko Epson
    • Silicon Labs
    • Texas Instruments
    • Toshiba
    • Toyocom U S A
Peripheral IC Type
    • TIMER, MEMORY REFRESH
    • TIMER, PROGRAMMABLE
    • TIMER, REAL TIME CLOCK
    • TIMER, TIME RECORDER
Temperature Grade
    • AUTOMOTIVE
    • COMMERCIAL
    • COMMERCIAL EXTENDED
    • INDUSTRIAL
    • MILITARY
    • OTHER
Terminal Form
    • BALL
    • BUTT
    • C BEND
    • FLAT
    • GULL WING
    • J BEND
    • J INVERTED
    • L BEND
    • NO LEAD
    • PIN/PEG
    • S BEND
    • THROUGH-HOLE
No. of Terminals
    • 10
    • 12
    • 14
    • 16
    • 168
    • 18
    • 2
    • 20
    • 22
    • 24
    • 26
    • 28
    • 32
    • 34
    • 36
    • 4
    • 40
    • 41
    • 44
    • 48
    • 5
    • 52
    • 6
    • 7
    • 8
    • 9
Package Code
    • BGA
    • DFP
    • DIE
    • DIP
    • HLSON
    • HSON
    • HTSON
    • HVQCCN
    • HVSON
    • HVSSOP
    • LQFP
    • LSOC
    • LSOJ
    • LSOP
    • LSSOP
    • QCCJ
    • QCCN
    • QFP
    • QIP
    • SIP
    • SOC
    • SOJ
    • SOJ-I
    • SON
    • SOP
    • SOS
    • SSOP
    • TFQFP
    • TQFP
    • TSOJ
    • TSOP
    • TSOP1
    • TSSOP
    • VBCC
    • VBGA
    • VFBGA
    • VQCCN
    • VSOF
    • VSON
    • VSSOP
Package Shape
    • RECTANGULAR
    • ROUND
    • SQUARE
    • UNSPECIFIED
Package Body Material
    • CERAMIC, GLASS-SEALED
    • CERAMIC, METAL-SEALED COFIRED
    • METAL
    • PLASTIC/EPOXY
    • UNSPECIFIED
Surface Mount
    • NO
    • YES
Information Access Method
    • I2C
    • I2C, SPI
    • I2C; SERIAL
    • I2C; SERIAL, 4-WIRE/3-WIRE
    • PARALLEL
    • PARALLEL, DIRECT ADDRESS
    • PARALLEL, DIRECT ADDRESS/MUXED BUS
    • PARALLEL, MUXED BUS
    • SERIAL
    • SERIAL(I2C)
    • SERIAL(SPI)
    • SERIAL, 1-WIRE
    • SERIAL, 2 WIRE/I2C
    • SERIAL, 2-WIRE/I2C
    • SERIAL, 3-WIRE
    • SERIAL, 3-WIRE/SPI
    • SERIAL, 4 WIRE/SPI
    • SERIAL, 4-WIRE/SPI
    • SERIAL, FIXED PROTOCOL
Maximum Supply Voltage
    • 1.89 V
    • 15 V
    • 18 V
    • 2.2 V
    • 3 V
    • 3.3 V
    • 3.6 V
    • 3.63 V
    • 3.7 V
    • 4 V
    • 4.2 V
    • 4.4 V
    • 4.5 V
    • 40 V
    • 42 V
    • 5 V
    • 5.25 V
    • 5.5 V
    • 6 V
    • 7 V
On Chip Data RAM Width
    • 4
    • 8
Screening Level
    • AEC-Q100
    • AEC-Q100; TS 16949
    • AEC-Q200
    • MIL-PRF-38535 Class Q
    • MIL-PRF-38535 Class V
    • MIL-STD-883
    • MIL-STD-883 Class B
    • TS 16949
No. of Bits
    • 1
    • 16
    • 4
    • 8
Maximum Output Clock Frequency
    • .000512 MHz
    • .002048 MHz
    • .008192 MHz
    • .032768 MHz
Power Supplies (V)
    • 1.1/5.5
    • 1.2/5
    • 1.2/5.5
    • 1.5/3
    • 1.5/3.3
    • 1.5/4
    • 1.5/5
    • 1.8
    • 1.8/3.3
    • 1.8/4.2
    • 1.8/5
    • 1/4.4
    • 2
    • 2.4/5.5
    • 2.5/4
    • 2.5/5
    • 2/3.3
    • 2/4
    • 2/5
    • 2/5.5
    • 3
    • 3,5
    • 3.15
    • 3.3
    • 3.3/5
    • 3.3/5.5
    • 3.6/5
    • 3/3.3
    • 3/5
    • 5
Package Style (Meter)
    • CHIP CARRIER
    • CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
    • CHIP CARRIER, VERY THIN PROFILE
    • DISK BUTTON
    • FLATPACK
    • FLATPACK, LOW PROFILE
    • FLATPACK, THIN PROFILE
    • FLATPACK, THIN PROFILE, FINE PITCH
    • GRID ARRAY
    • GRID ARRAY, VERY THIN PROFILE
    • GRID ARRAY, VERY THIN PROFILE, FINE PITCH
    • IN-LINE
    • MICROELECTRONIC ASSEMBLY
    • SMALL OUTLINE
    • SMALL OUTLINE, HEAT SINK/SLUG
    • SMALL OUTLINE, HEAT SINK/SLUG, LOW PROFILE
    • SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE
    • SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE
    • SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE, SHRINK PITCH
    • SMALL OUTLINE, LOW PROFILE
    • SMALL OUTLINE, LOW PROFILE, SHRINK PITCH
    • SMALL OUTLINE, SHRINK PITCH
    • SMALL OUTLINE, THIN PROFILE
    • SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
    • SMALL OUTLINE, VERY THIN PROFILE
    • SMALL OUTLINE, VERY THIN PROFILE, SHRINK PITCH
    • SPECIAL SHAPE
    • UNCASED CHIP
Package Equivalence Code
    • BGA12,3X4,10
    • BGA12,3X4,16
    • BGA12,3X4,20
    • BGA168(UNSPEC)
    • BGA168,19X23,50
    • BGA36,9X8,50
    • BGA48,8X11,50
    • DIE OR CHIP
    • DIP14,.3
    • DIP16,.3
    • DIP18,.3
    • DIP20,.3
    • DIP24,.3
    • DIP24,.6
    • DIP28,.6
    • DIP32,.6
    • DIP32,.8
    • DIP36,.6
    • DIP40(UNSPEC)
    • DIP8,.3
    • FLIP CHIP
    • LCC10,.1X.12,27
    • LCC16,.12SQ,20
    • LCC16,.16SQ,25
    • LCC20,.20SQ,25
    • LCC28,.5SQ
    • LDCC28,.5SQ
    • MODULE,26LEAD,.80
    • MODULE,34LEAD,1.0
    • QFP44,.57SQ,32
    • SOJ20,.24,25
    • SOLCC10,.098,27
    • SOLCC10,.098,35
    • SOLCC10,.1,28
    • SOLCC10,.1,32
    • SOLCC10,.11,20
    • SOLCC10,.12,20
    • SOLCC10,.12,40
    • SOLCC10,.12SQ,20
    • SOLCC14,.12,16
    • SOLCC16,.14,20
    • SOLCC16,.16,20
    • SOLCC20,.16,20
    • SOLCC22,.2,20
    • SOLCC6,.11,37
    • SOLCC8,.06,31
    • SOLCC8,.06,35
    • SOLCC8,.07,20
    • SOLCC8,.08,20
    • SOLCC8,.11,20
    • SOLCC8,.12,20
    • SOLCC8,.12,25
    • SOLCC8,.16,31
    • SOLCC8,.16,32
    • SOP14,.24
    • SOP14,.25
    • SOP14,.3
    • SOP16,.25
    • SOP16,.3
    • SOP16,.4
    • SOP18,.4
    • SOP20,.3
    • SOP20,.4
    • SOP24,.4
    • SOP24,.5
    • SOP28,.4
    • SOP28,.45
    • SOP28,.5
    • SOP44,.5,32
    • SOP8,.19
    • SOP8,.2,25
    • SOP8,.23
    • SOP8,.25
    • SOP8,.3
    • SOP8,.4
    • SSOJ20,.25
    • SSOP20,.25
    • SSOP20,.3
    • SSOP24,.24
    • SSOP8,.25
    • TQFP32,.35SQ,32
    • TQFP44,.47SQ,32
    • TQFP48,.35SQ
    • TSOP32,.46
    • TSOP6,.11,37
    • TSSOJ12,.11,20
    • TSSOP10,.19,20
    • TSSOP10,.2,20
    • TSSOP14,.25
    • TSSOP16,.25
    • TSSOP20,.25
    • TSSOP24,.25
    • TSSOP28,.25
    • TSSOP28,.53,22
    • TSSOP32,.8,20
    • TSSOP8,.1
    • TSSOP8,.19
    • TSSOP8,.2
    • TSSOP8,.25
    • WAFER
Interrupt Capability
    • N
    • Y
Minimum Supply Voltage
    • -.3 V
    • .9 V
    • 1 V
    • 1.1 V
    • 1.2 V
    • 1.25 V
    • 1.3 V
    • 1.35 V
    • 1.4 V
    • 1.5 V
    • 1.55 V
    • 1.6 V
    • 1.7 V
    • 1.71 V
    • 1.8 V
    • 2 V
    • 2.2 V
    • 2.3 V
    • 2.38 V
    • 2.4 V
    • 2.45 V
    • 2.5 V
    • 2.7 V
    • 2.8 V
    • 2.97 V
    • 3 V
    • 3.3 V
    • 3.5 V
    • 4 V
    • 4.5 V
    • 4.75 V
    • 5 V
Maximum Operating Temperature
    • 100 Cel
    • 105 Cel
    • 125 Cel
    • 70 Cel
    • 75 Cel
    • 85 Cel
Minimum Operating Temperature
    • -10 Cel
    • -15 Cel
    • -20 Cel
    • -25 Cel
    • -30 Cel
    • -40 Cel
    • -45 Cel
    • -55 Cel
    • 0 Cel
Terminal Finish
    • GOLD
    • GOLD OVER NICKEL
    • Gold (Au)
    • Gold (Au) - with Nickel (Ni) barrier
    • MATTE TIN
    • Matte Tin (Sn)
    • Matte Tin (Sn) - annealed
    • NICKEL GOLD
    • NICKEL PALLADIUM
    • NICKEL PALLADIUM GOLD
    • NICKEL PALLADIUM GOLD SILVER
    • Nickel/Palladium/Gold (Ni/Pd/Au)
    • TIN
    • TIN BISMUTH
    • TIN LEAD
    • TIN SILVER
    • TIN SILVER COPPER
    • TIN SILVER COPPER NICKEL
    • TIN/NICKEL PALLADIUM GOLD
    • TIN/TIN SILVER
    • Tin (Sn)
    • Tin/Bismuth (Sn/Bi)
    • Tin/Lead (Sn/Pb)
    • Tin/Lead (Sn80Pb20)
    • Tin/Lead (Sn85Pb15)
    • Tin/Silver (Sn/Ag)
Terminal Position
    • BOTTOM
    • DUAL
    • END
    • QUAD
    • SINGLE
    • UPPER
Maximum Seated Height
    • .17 mm
    • .2 mm
    • .215 mm
    • .22 mm
    • .24 mm
    • .5 mm
    • .55 mm
    • .625 mm
    • .69 mm
    • .8 mm
    • .835 mm
    • .845 mm
    • .864 mm
    • .9 mm
    • 1 mm
    • 1.05 mm
    • 1.1 mm
    • 1.2 mm
    • 1.24 mm
    • 1.25 mm
    • 1.3 mm
    • 1.4 mm
    • 1.45 mm
    • 1.5 mm
    • 1.65 mm
    • 1.71 mm
    • 1.7272 mm
    • 1.73 mm
    • 1.75 mm
    • 1.8 mm
    • 1.99 mm
    • 10.28 mm
    • 10.42 mm
    • 10.668 mm
    • 10.67 mm
    • 10.922 mm
    • 11.88 mm
    • 11.94 mm
    • 12.04 mm
    • 2 mm
    • 2.03 mm
    • 2.05 mm
    • 2.13 mm
    • 2.25 mm
    • 2.3368 mm
    • 2.45 mm
    • 2.5 mm
    • 2.54 mm
    • 2.64 mm
    • 2.65 mm
    • 2.667 mm
    • 2.67 mm
    • 2.68 mm
    • 2.69 mm
    • 2.7 mm
    • 2.79 mm
    • 2.8 mm
    • 2.92 mm
    • 3 mm
    • 3.05 mm
    • 3.3 mm
    • 3.68 mm
    • 4.2 mm
    • 4.44 mm
    • 4.5 mm
    • 4.52 mm
    • 4.57 mm
    • 4.572 mm
    • 4.6 mm
    • 4.69 mm
    • 4.7 mm
    • 4.8 mm
    • 4.826 mm
    • 4.96 mm
    • 5 mm
    • 5.08 mm
    • 5.3 mm
    • 5.33 mm
    • 5.334 mm
    • 5.588 mm
    • 5.7 mm
    • 5.715 mm
    • 5.72 mm
    • 5.842 mm
    • 5.92 mm
    • 6.35 mm
    • 6.858 mm
    • 7.62 mm
    • 8.128 mm
    • 8.38 mm
    • 8.51 mm
    • 9.02 mm
    • 9.27 mm
    • 9.398 mm
    • 9.52 mm
    • 9.53 mm
    • 9.65 mm
    • 9.652 mm
RAM Words
    • 1
    • 114
    • 128
    • 128K
    • 16384
    • 2
    • 2040
    • 236
    • 248
    • 256
    • 268288
    • 30
    • 32
    • 32760
    • 4096
    • 50
    • 56
    • 64
    • 65536
    • 7
    • 8
    • 8176
    • 8179
    • 8184
Width
    • .935 mm
    • 1 mm
    • 1.09 mm
    • 1.14 mm
    • 1.228 mm
    • 1.25 mm
    • 1.27 mm
    • 1.31 mm
    • 1.4 mm
    • 1.449 mm
    • 1.468 mm
    • 1.5 mm
    • 1.6 mm
    • 1.625 mm
    • 1.91 mm
    • 1.97 mm
    • 10 mm
    • 11.43 mm
    • 11.455 mm
    • 11.4808 mm
    • 11.5 mm
    • 11.505 mm
    • 11.5062 mm
    • 11.51 mm
    • 11.8 mm
    • 12.7 mm
    • 15.24 mm
    • 16.5862 mm
    • 16.6 mm
    • 16.765 mm
    • 17.653 mm
    • 18.085 mm
    • 18.415 mm
    • 2 mm
    • 2.4 mm
    • 2.5 mm
    • 2.6 mm
    • 2.8 mm
    • 2.962 mm
    • 21.5265 mm
    • 21.59 mm
    • 23.495 mm
    • 3 mm
    • 3.2 mm
    • 3.5 mm
    • 3.6 mm
    • 3.65 mm
    • 3.76 mm
    • 3.81 mm
    • 3.885 mm
    • 3.9 mm
    • 3.905 mm
    • 3.91 mm
    • 3.9116 mm
    • 4 mm
    • 4.4 mm
    • 4.8 mm
    • 40 mm
    • 42.5 mm
    • 43.815 mm
    • 44.5 mm
    • 5 mm
    • 5.23 mm
    • 5.275 mm
    • 5.285 mm
    • 5.29 mm
    • 5.3 mm
    • 5.4 mm
    • 5.6 mm
    • 7 mm
    • 7.49 mm
    • 7.495 mm
    • 7.5 mm
    • 7.51 mm
    • 7.52 mm
    • 7.5565 mm
    • 7.56 mm
    • 7.62 mm
    • 7.9 mm
    • 8 mm
    • 8.4 mm
    • 8.56 mm
    • 8.565 mm
    • 8.8 mm
    • 8.89 mm
    • 8.9662 mm
    • 9.905 mm
    • 9.95 mm
Additional Features
    • 1 HZ FIXED O/P; 64-BIT LASERED ROM; TIMEKEEPING CURRENT = 350NA
    • 10 YEARS DATA RETENTION; ACCURACY 1 MIN/MONTH @ 25 DEGREE C; SOFTWARE CLOCK CALIBRATION
    • 10 YEARS DATA RETENTION; ACCURACY 1 MIN/MONTH @ 25 DEGREE C; WRITE PROTECT VOLTAGE = 4.2V
    • 10 YEARS DATA RETENTION; ACCURACY 1 MIN/MONTH @ 25 DEGREE C; WRITE PROTECT VOLTAGE = 4.5V
    • 10 YEARS DATA RETENTION; SERIAL 64-BIT PROTOCOL; ACCURACY 1 MIN/MONTH @ 25 DEGREE C
    • 128HZ & SEC FIXED O/P'S
    • 128HZ, SEC & MIN FIXED O/P'S
    • 3-CHANNEL, 8-BIT ADC
    • 4 PROGRAMMABLE MODES FOR TIMER; 4 SELECTABLE OSCILLATOR FREQUENCIES
    • 6 PROGRAMMABLE MODES
    • A POWERCAP MODULE CONTAINING CRYSTAL AND BATTERY REQUIRED
    • ACCURACY 1 MIN/MONTH @ 25 DEGREE C; 10 YEARS DATA RETENTION
    • ACCURACY 1 MIN/MONTH @ 25 DEGREE C; 10 YEARS DATA RETENTION; SERIAL 64-BIT PROTOCOL
    • ACCURACY 1 MIN/MONTH @ 25 DEGREE C; 1024 HZ FIXED O/P; 10 YEARS DATA RETENTION
    • ACCURACY 1 MIN/MONTH @ 25 DEGREE C; WRITE PROTECT VOLTAGE = 4.2V; SNAPHAT HOUSING FOR XTAL & BATTERY
    • ACCURACY 2 MIN/MONTH @ 25 DEGREE C; 1024 HZ FIXED O/P
    • ALSO OPEARTES AT 1.8 V MINIMUM SUPPLY AT 3 MHZ
    • ALSO OPEARTES AT 1.8V MIN SUPPLY AT 3MHZ CLOCK FREQ
    • ALSO OPERATES AT 1.8 V AT 400KHZ
    • ALSO OPERATES AT 100KHZ WITH 1.8 V NOMINAL
    • ALSO OPERATES AT 5 V TYP SUPPLY
    • ALSO OPERATES AT 5V SUPPLY
    • ALSO OPERATES WITH 5 V NOMINAL
    • ALSO REQUIRED 1.3V-4.4V SUPPLY FOR I2C BUS ACTIVE
    • ALSO REQUIRED 1.4V-5.5V SUPPLY FOR I2C BUS ACTIVE
    • ALSO REQUIRES 4.5 TO 5.5 VOLTS
    • AUTO WORD INCREMENTING; ACCURACY 1 MIN/MONTH @ 25 DEGREE C; SOFTWARE CLOCK CALIBRATION
    • AUXILIARY BATTERY I/P; POWER ON INTRPT WITH KICK START; RAM CLEAR I/P; 64-BIT SILICON SERIAL NUMBER
    • BURST MODE RAM DATA TRANSFER; TIMEKEEPING CURRENT = 0.3UA
    • CAN ALSO OPERATE AT 5V
    • CAN ALSO OPERATE WITH 5V SUPPLY
    • CASE NO : 64026634
    • CORRECT SUBGROUP IS TMR STD
    • DAISY CHAIN INTERRUPT STRUCTURE; PRESCALED /16, /256 TIMER I/P'S
    • DAISY CHAIN INTERRUPT STRUCTURE; PRESCALED /16, /256 TIMER I/P'S; SELECTABLE TIMER, COUNTER MODES
    • DAYLIGHT SAVINGS OPTION; SELECTABLE MOTOROLA/INTEL TIMING
    • DAYLIGHT SAVINGS OPTION; SELECTABLE MOTOROLA/INTEL TIMING; 10 YEARS DATA RETENTION
    • DAYLIGHT SAVINGS OPTION; SELECTABLE MOTOROLA/INTEL TIMING; 10 YEARS DATA RETENTION; RAM CLEAR I/P
    • FIXED FREQUENCY TEST O/P; SNAPHAT HOUSING FOR XTAL & BATTERY
    • IT ALSO OPERATES AT 2 TO 5.5 POWER SUPPLY VOLTAGE
    • IT CAN ALSO OPERATE WITH 5V
    • LENGTH_MAX
    • LG-MAX
    • ONE BYTE PROTOCOL; 1 HZ FIXED O/P; 10 YEARS DATA RETENTION; ACCURACY 2 MIN/MONTH
    • PRESCALED /8 TIMER 3 I/P
    • PRESCALED XTAL OSCILLATOR OUTPUT FOR RTC
    • PRESCALED XTAL OSCILLATOR OUTPUT FOR RTC; POWER FAIL I/P FOR BUS LOCK-OUT
    • PROGRAMMABLE MODES
    • REQUIRES BATTERY PACKAGE (SNAPHAT)
    • SEATED HGT-NOM
    • SEATED-HGT CALCULATED
    • SELECTABLE INTEL/MOTOROLA TIMING; ACCURACY 1 MIN/MONTH @ 25 DEGREE C; 10 YEARS DATA RETENTION
    • TIMEKEEPING CURRENT = 10UA; AUTO WORD INCREMENTING
    • TIMEKEEPING CURRENT = 10UA; MIN PROGRAMMABLE DELAY = 0.01562S; 30 SEC ADJUSTMENT
    • TIMEKEEPING CURRENT = 1UA; 10 YEARS DATA RETENTION; ACCURACY 1 MIN/MONTH @ 25 DEGREE C
    • TWO 32-BIT COUNTERS TO TRACK REAL & ELAPSED TIME; ONE BYTE PROTOCOL; TIMEKEEPING CURRENT = 400NA
    • USE DS9034PCX TO ORDER POWERCAP
    • WATCHDOG OUTPUT; LOW BATTERY DETECTOR; SNAPHAT HOUSING FOR XTAL & BATTERY
    • WATCHDOG TIMER
    • WRITE PROTECT VOLTAGE = 4.2V; ACCURACY 1 MIN/MONTH @ 25 DEGREE C; 11 YEARS DATA RETENTION @ 70 DEG C
    • WRITE PROTECT VOLTAGE = 4.5V; ACCURACY 1 MIN/MONTH @ 25 DEGREE C; 11 YEARS DATA RETENTION @ 70 DEG C
    • WRITE PROTECT; 10 YEARS OF DATA RETENTION
    • also operates with 0.5 mhz @ 1.2v min supply
External Data Bus Width
    • 0
    • 1
    • 16
    • 32
    • 4
    • 8
Maximum Clock Frequency
    • .000032768 MHz
    • .008 MHz
    • .032 MHz
    • .032768 MHz
    • .06 MHz
    • .08 MHz
    • .1 MHz
    • .3 MHz
    • .32768 MHz
    • .4 MHz
    • 1 MHz
    • 10 MHz
    • 12 MHz
    • 14.285 MHz
    • 2 MHz
    • 2.1 MHz
    • 2.5 MHz
    • 3 MHz
    • 4 MHz
    • 4.1943 MHz
    • 4.2 MHz
    • 5 MHz
    • 6 MHz
    • 6.17 MHz
    • 6.5 MHz
    • 6.67 MHz
    • 8 MHz
    • 8.3 MHz
Maximum Time At Peak Reflow Temperature (s)
    • 10
    • 20
    • 30
    • 40
    • NOT SPECIFIED
Peak Reflow Temperature (C)
    • 220
    • 225
    • 235
    • 240
    • 245
    • 250
    • 260
    • 265
    • NOT SPECIFIED
Length
    • 1 mm
    • 1.185 mm
    • 1.19 mm
    • 1.37 mm
    • 1.45 mm
    • 1.492 mm
    • 1.615 mm
    • 1.628 mm
    • 1.8 mm
    • 1.9 mm
    • 1.968 mm
    • 10 mm
    • 10.1 mm
    • 10.15 mm
    • 10.2 mm
    • 10.21 mm
    • 10.285 mm
    • 10.3 mm
    • 10.31 mm
    • 10.335 mm
    • 11.43 mm
    • 11.455 mm
    • 11.4808 mm
    • 11.5 mm
    • 11.505 mm
    • 11.5062 mm
    • 11.51 mm
    • 11.6 mm
    • 11.61 mm
    • 11.8 mm
    • 12.7 mm
    • 12.8 mm
    • 12.82 mm
    • 15.24 mm
    • 15.3 mm
    • 15.365 mm
    • 15.4 mm
    • 15.415 mm
    • 15.43 mm
    • 15.88 mm
    • 15.95 mm
    • 16 mm
    • 16.3 mm
    • 16.5862 mm
    • 16.6 mm
    • 17.9 mm
    • 17.96 mm
    • 17.9705 mm
    • 18.095 mm
    • 18.1 mm
    • 18.4 mm
    • 18.5 mm
    • 18.86 mm
    • 19.025 mm
    • 19.17 mm
    • 19.175 mm
    • 19.9 mm
    • 19.94 mm
    • 2 mm
    • 2.23 mm
    • 2.6 mm
    • 2.85 mm
    • 2.9 mm
    • 2.92 mm
    • 2.995 mm
    • 21.335 mm
    • 21.463 mm
    • 21.6 mm
    • 21.755 mm
    • 22 mm
    • 22.6 mm
    • 22.606 mm
    • 23.1 mm
    • 23.495 mm
    • 24.384 mm
    • 24.4475 mm
    • 24.5745 mm
    • 25.019 mm
    • 3 mm
    • 3.2 mm
    • 3.6 mm
    • 3.7 mm
    • 3.937 mm
    • 3.94 mm
    • 31 mm
    • 31.75 mm
    • 31.915 mm
    • 32 mm
    • 32.77 mm
    • 33.02 mm
    • 33.782 mm
    • 34.545 mm
    • 35.6 mm
    • 35.69 mm
    • 36.83 mm
    • 36.96 mm
    • 37 mm
    • 37.02 mm
    • 37.084 mm
    • 37.085 mm
    • 37.595 mm
    • 38.1 mm
    • 38.225 mm
    • 38.227 mm
    • 38.675 mm
    • 38.862 mm
    • 38.865 mm
    • 39.625 mm
    • 4 mm
    • 4.4 mm
    • 4.462 mm
    • 4.5 mm
    • 4.88 mm
    • 4.9 mm
    • 4.9022 mm
    • 40 mm
    • 40.635 mm
    • 42.5 mm
    • 42.8 mm
    • 42.925 mm
    • 43.053 mm
    • 43.815 mm
    • 44.5 mm
    • 5 mm
    • 5.02 mm
    • 5.13 mm
    • 5.255 mm
    • 5.31 mm
    • 5.5 mm
    • 52.324 mm
    • 52.96 mm
    • 6.2 mm
    • 6.3 mm
    • 6.5 mm
    • 7 mm
    • 7.2 mm
    • 7.55 mm
    • 7.8 mm
    • 8.2 mm
    • 8.65 mm
    • 8.6614 mm
    • 8.89 mm
    • 8.9662 mm
    • 9.27 mm
    • 9.271 mm
    • 9.375 mm
    • 9.5 mm
    • 9.55 mm
    • 9.585 mm
    • 9.7 mm
    • 9.9 mm
    • 9.95 mm
Total Dose (V)
    • 100k Rad(Si)
No. of Timers
    • 0
    • 1
    • 2
    • 3
    • 4
    • 5
    • 6
Technology
    • BICMOS
    • CMOS
    • MOS
    • NMOS
Maximum Supply Current
    • .00000006 mA
    • .00008 mA
    • .00012 mA
    • .0005 mA
    • .0008 mA
    • .000885 mA
    • .0009 mA
    • .0012 mA
    • .004 mA
    • .01 mA
    • .015 mA
    • .025 mA
    • .035 mA
    • .05 mA
    • .06 mA
    • .1 mA
    • .15 mA
    • .2 mA
    • .3 mA
    • .325 mA
    • .4 mA
    • .45 mA
    • .5 mA
    • .8 mA
    • 1 mA
    • 1.2 mA
    • 1.28 mA
    • 1.5 mA
    • 10 mA
    • 100 mA
    • 140 mA
    • 15 mA
    • 170 mA
    • 2 mA
    • 20 mA
    • 25 mA
    • 3 mA
    • 3.5 mA
    • 30 mA
    • 5 mA
    • 50 mA
    • 7 mA
    • 80 mA
    • 9 mA
Minimum Time
    • 1/10 SECOND
    • 1/100 SECOND
    • 1/1024 SECOND
    • 1/64 SECOND
    • MINUTES
    • SECONDS
Nominal Supply Voltage
    • 1.6 V
    • 1.8 V
    • 13 V
    • 14 V
    • 2 V
    • 2.5 V
    • 2.7 V
    • 2.8 V
    • 3 V
    • 3.15 V
    • 3.3 V
    • 4 V
    • 5 V
Sub-Category
    • Timer or RTC
    • Timers or RTCs
Bus Compatibility
    • 10MHZ 8086/88; 10MHZ 80186/188
    • 6800
    • 8048; 8051; 8085
    • 8080; 8085; 8086; 8088; 80286; 80386; 68000
    • 8085; 8048; 8049; MC3870; MC6805; MC146805; S2000; 8021
    • 8085; Z80; MCS48; 80C49
    • CDP6805D2
    • HMCS6800
    • I2C
    • SPI
    • Z80
    • Z80C
Terminal Pitch
    • .25 mm
    • .35 mm
    • .4 mm
    • .44 mm
    • .5 mm
    • .55 mm
    • .635 mm
    • .65 mm
    • .7 mm
    • .8 mm
    • .81 mm
    • .9 mm
    • .95 mm
    • 1 mm
    • 1.27 mm
    • 2.54 mm
JESD-30 Code
    • O-MEDB-N2
    • R-CDFP-F24
    • R-CDIP-T14
    • R-CDIP-T24
    • R-CDIP-T28
    • R-CDSO-N10
    • R-CDSO-N8
    • R-CQCC-N10
    • R-GDIP-T14
    • R-GDIP-T16
    • R-GDIP-T24
    • R-GDIP-T28
    • R-PBGA-B12
    • R-PBGA-B36
    • R-PBGA-B48
    • R-PBGA-B6
    • R-PDIP-P24
    • R-PDIP-P28
    • R-PDIP-P32
    • R-PDIP-T14
    • R-PDIP-T16
    • R-PDIP-T18
    • R-PDIP-T20
    • R-PDIP-T24
    • R-PDIP-T28
    • R-PDIP-T32
    • R-PDIP-T36
    • R-PDIP-T40
    • R-PDIP-T8
    • R-PDMA-P24
    • R-PDMA-P32
    • R-PDMA-T28
    • R-PDMA-T32
    • R-PDMA-T36
    • R-PDSO-C6
    • R-PDSO-F8
    • R-PDSO-G10
    • R-PDSO-G14
    • R-PDSO-G16
    • R-PDSO-G18
    • R-PDSO-G20
    • R-PDSO-G24
    • R-PDSO-G28
    • R-PDSO-G32
    • R-PDSO-G44
    • R-PDSO-G48
    • R-PDSO-G5
    • R-PDSO-G6
    • R-PDSO-G8
    • R-PDSO-J12
    • R-PDSO-J20
    • R-PDSO-J22
    • R-PDSO-N10
    • R-PDSO-N16
    • R-PDSO-N20
    • R-PDSO-N22
    • R-PDSO-N6
    • R-PDSO-N8
    • R-PDSO-S34
    • R-PDSO-U34
    • R-PSIP-T4
    • R-XBCC-B12
    • R-XBCC-B6
    • R-XBCC-B8
    • R-XDIP-P28
    • R-XDIP-P32
    • R-XDIP-T28
    • R-XDIP-T32
    • R-XDMA-L34
    • R-XDMA-N34
    • R-XDMA-P28
    • R-XDMA-P32
    • R-XDMA-P34
    • R-XDMA-P40
    • R-XDMA-T24
    • R-XDMA-T28
    • R-XDMA-T32
    • R-XDMA-T36
    • R-XDMA-U28
    • R-XDMA-U34
    • R-XDSO-N16
    • R-XDSO-N6
    • R-XDSO-U34
    • R-XDSS-P4
    • R-XQCC-N
    • R-XQMA-N10
    • R-XSIP-T7
    • R-XUUC-N12
    • R-XUUC-N9
    • S-CQCC-N28
    • S-PBGA-B168
    • S-PBGA-B41
    • S-PDSO-G10
    • S-PDSO-G8
    • S-PDSO-N10
    • S-PDSO-N14
    • S-PDSO-N6
    • S-PDSO-N8
    • S-PQCC-J20
    • S-PQCC-J28
    • S-PQCC-J44
    • S-PQCC-N16
    • S-PQCC-N20
    • S-PQFP-G32
    • S-PQFP-G44
    • S-PQFP-G48
    • S-PQFP-G52
    • S-XDSO-N12
    • S-XDSO-N6
    • S-XDSO-N8
    • S-XQCC-N16
    • S-XQCC-N8
    • X-XDMA-U34
    • X-XUUC-N
    • X-XUUC-N12
Moisture Sensitivity Level (MSL)
    • 1
    • 2
    • 2A
    • 3
    • 5
Qualification
    • Not Qualified
    • Qualified
Volatile
    • NO
    • YES
JESD-609 Code
    • e0
    • e1
    • e2
    • e3
    • e3/e2
    • e3/e4
    • e4
    • e6
Reset All
Part RoHS Manufacturer Peripheral IC Type Temperature Grade Terminal Form No. of Terminals Package Code Package Shape Package Body Material Surface Mount Information Access Method Maximum Supply Voltage On Chip Data RAM Width Screening Level No. of Bits Maximum Output Clock Frequency Power Supplies (V) Package Style (Meter) Package Equivalence Code Interrupt Capability Minimum Supply Voltage Maximum Operating Temperature Minimum Operating Temperature Terminal Finish Terminal Position Maximum Seated Height RAM Words Width Additional Features External Data Bus Width Maximum Clock Frequency Maximum Time At Peak Reflow Temperature (s) Peak Reflow Temperature (C) Length Total Dose (V) No. of Timers Technology Maximum Supply Current Minimum Time Nominal Supply Voltage Sub-Category Bus Compatibility Terminal Pitch JESD-30 Code Moisture Sensitivity Level (MSL) Qualification Volatile JESD-609 Code

UA555HMQB

Fairchild Semiconductor

TIN LEAD

CMOS

2A

e0

SA555P3

Texas Instruments

TIMER, MEMORY REFRESH

NOT SPECIFIED

NOT SPECIFIED

CMOS

DP8573AV

Texas Instruments

TIMER, REAL TIME CLOCK

INDUSTRIAL

J BEND

28

QCCJ

SQUARE

PLASTIC/EPOXY

YES

PARALLEL, DIRECT ADDRESS

5.5 V

3/5

CHIP CARRIER

LDCC28,.5SQ

Y

4.5 V

85 Cel

-40 Cel

TIN LEAD

QUAD

4.57 mm

11.43 mm

PRESCALED XTAL OSCILLATOR OUTPUT FOR RTC; POWER FAIL I/P FOR BUS LOCK-OUT

8

245

11.43 mm

0

CMOS

1/100 SECOND

5 V

Timer or RTC

1.27 mm

S-PQCC-J28

2A

Not Qualified

YES

e0

BQ4285LQ

Texas Instruments

TIMER, REAL TIME CLOCK

COMMERCIAL

J BEND

28

QCCJ

SQUARE

PLASTIC/EPOXY

YES

PARALLEL, MUXED BUS

3.6 V

3.15

CHIP CARRIER

LDCC28,.5SQ

Y

2.7 V

70 Cel

0 Cel

QUAD

8

.032 MHz

1

CMOS

SECONDS

3.15 V

Timer or RTC

1.27 mm

S-PQCC-J28

Not Qualified

YES

TLC555MJG/883B

Texas Instruments

NOT SPECIFIED

NOT SPECIFIED

CMOS

SE555CJG/883B

Texas Instruments

TIMER, MEMORY REFRESH

NOT SPECIFIED

NOT SPECIFIED

CMOS

TLC552CN3

Texas Instruments

NOT SPECIFIED

NOT SPECIFIED

CMOS

BQ4285ESNTR

Texas Instruments

TIMER, REAL TIME CLOCK

INDUSTRIAL

GULL WING

24

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

PARALLEL, MUXED BUS

5.5 V

SMALL OUTLINE

4.5 V

85 Cel

-40 Cel

DUAL

8

.032 MHz

1

CMOS

5 V

R-PDSO-G24

Not Qualified

DP8570AVX

Texas Instruments

TIMER, REAL TIME CLOCK

INDUSTRIAL

J BEND

28

QCCJ

SQUARE

PLASTIC/EPOXY

YES

PARALLEL, DIRECT ADDRESS

5.5 V

16

3/5

CHIP CARRIER

LDCC28,.5SQ

Y

4.5 V

85 Cel

-40 Cel

TIN LEAD

QUAD

4.57 mm

11.43 mm

4 PROGRAMMABLE MODES FOR TIMER; 4 SELECTABLE OSCILLATOR FREQUENCIES

8

10 MHz

245

11.43 mm

2

CMOS

1/100 SECOND

5 V

Timer or RTC

1.27 mm

S-PQCC-J28

2A

Not Qualified

YES

e0

NE555P3

Texas Instruments

TIMER, MEMORY REFRESH

NOT SPECIFIED

NOT SPECIFIED

CMOS

NE555DP3

Texas Instruments

TIMER, MEMORY REFRESH

NOT SPECIFIED

NOT SPECIFIED

CMOS

DP8570AN

Texas Instruments

TIMER, REAL TIME CLOCK

INDUSTRIAL

THROUGH-HOLE

28

DIP

RECTANGULAR

PLASTIC/EPOXY

NO

PARALLEL

3,5

IN-LINE

DIP28,.6

Y

85 Cel

-40 Cel

DUAL

NOT SPECIFIED

NOT SPECIFIED

2

CMOS

1/100 SECOND

Timers or RTCs

2.54 mm

R-PDIP-T28

Not Qualified

YES

5962-01-049-0349

Texas Instruments

TIMER, MEMORY REFRESH

NOT SPECIFIED

NOT SPECIFIED

CMOS

Not Qualified

TLC551CJGP4

Texas Instruments

NOT SPECIFIED

NOT SPECIFIED

CMOS

NE555JG/P4

Texas Instruments

TIMER, MEMORY REFRESH

NOT SPECIFIED

NOT SPECIFIED

CMOS

5962-01-131-7956

Texas Instruments

NOT SPECIFIED

NOT SPECIFIED

CMOS

Not Qualified

DP8570AVX/NOPB

Texas Instruments

TIMER, REAL TIME CLOCK

INDUSTRIAL

J BEND

28

QCCJ

SQUARE

PLASTIC/EPOXY

YES

PARALLEL, DIRECT ADDRESS

5.5 V

16

3/5

CHIP CARRIER

LDCC28,.5SQ

Y

4.5 V

85 Cel

-40 Cel

MATTE TIN

QUAD

4.57 mm

11.43 mm

4 PROGRAMMABLE MODES FOR TIMER; 4 SELECTABLE OSCILLATOR FREQUENCIES

8

10 MHz

30

245

11.43 mm

2

CMOS

1/100 SECOND

5 V

Timer or RTC

1.27 mm

S-PQCC-J28

2A

Not Qualified

YES

e3

SN72555JP

Texas Instruments

TIMER, MEMORY REFRESH

NOT SPECIFIED

NOT SPECIFIED

CMOS

BQ4285LSNTR

Texas Instruments

TIMER, REAL TIME CLOCK

INDUSTRIAL

GULL WING

24

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

PARALLEL, MUXED BUS

3.6 V

SMALL OUTLINE

2.7 V

85 Cel

-40 Cel

DUAL

8

.032 MHz

1

CMOS

3.15 V

R-PDSO-G24

Not Qualified

BQ4285ES

Texas Instruments

TIMER, REAL TIME CLOCK

COMMERCIAL

GULL WING

24

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

PARALLEL, MUXED BUS

5.5 V

5

SMALL OUTLINE

SOP24,.4

Y

4.5 V

70 Cel

0 Cel

DUAL

2.67 mm

7.56 mm

8

.032 MHz

15.43 mm

1

CMOS

SECONDS

5 V

Timer or RTC

1.27 mm

R-PDSO-G24

Not Qualified

YES

BQ4285LP

Texas Instruments

TIMER, REAL TIME CLOCK

COMMERCIAL

THROUGH-HOLE

24

DIP

RECTANGULAR

PLASTIC/EPOXY

NO

PARALLEL, MUXED BUS

3.6 V

3.15

IN-LINE

DIP24,.6

Y

2.7 V

70 Cel

0 Cel

DUAL

5.08 mm

15.24 mm

8

.032 MHz

NOT SPECIFIED

NOT SPECIFIED

31.75 mm

1

CMOS

SECONDS

3.15 V

Timer or RTC

2.54 mm

R-PDIP-T24

Not Qualified

YES

BQ4285ESTR

Texas Instruments

TIMER, REAL TIME CLOCK

COMMERCIAL

GULL WING

24

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

PARALLEL, MUXED BUS

5.5 V

SMALL OUTLINE

4.5 V

70 Cel

0 Cel

DUAL

2.67 mm

7.56 mm

8

.032 MHz

15.43 mm

1

CMOS

5 V

1.27 mm

R-PDSO-G24

Not Qualified

BQ4285EPN

Texas Instruments

TIMER, REAL TIME CLOCK

INDUSTRIAL

THROUGH-HOLE

24

DIP

RECTANGULAR

PLASTIC/EPOXY

NO

PARALLEL, MUXED BUS

5.5 V

5

IN-LINE

DIP24,.6

Y

4.5 V

85 Cel

-40 Cel

DUAL

8

.032 MHz

1

CMOS

SECONDS

5 V

Timer or RTC

2.54 mm

R-PDIP-T24

Not Qualified

YES

NE555P/P3

Texas Instruments

TIMER, MEMORY REFRESH

NOT SPECIFIED

NOT SPECIFIED

CMOS

BQ4285LQN

Texas Instruments

TIMER, REAL TIME CLOCK

INDUSTRIAL

J BEND

28

QCCJ

SQUARE

PLASTIC/EPOXY

YES

PARALLEL, MUXED BUS

3.6 V

3.15

CHIP CARRIER

LDCC28,.5SQ

Y

2.7 V

85 Cel

-40 Cel

QUAD

8

.032 MHz

1

CMOS

SECONDS

3.15 V

Timer or RTC

1.27 mm

S-PQCC-J28

Not Qualified

YES

SN52555JP

Texas Instruments

TIMER, MEMORY REFRESH

NOT SPECIFIED

NOT SPECIFIED

CMOS

BQ4285S-SB2TR

Texas Instruments

TIMER, REAL TIME CLOCK

COMMERCIAL

GULL WING

24

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

PARALLEL, MUXED BUS

5.5 V

5

SMALL OUTLINE

SOP24,.4

Y

4.5 V

70 Cel

0 Cel

NICKEL PALLADIUM GOLD

DUAL

2.65 mm

7.5 mm

8

.032 MHz

30

260

15.4 mm

1

CMOS

SECONDS

5 V

Timer or RTC

1.27 mm

R-PDSO-G24

1

Not Qualified

NO

e4

BQ4285LSTR

Texas Instruments

TIMER, REAL TIME CLOCK

COMMERCIAL

GULL WING

24

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

PARALLEL, MUXED BUS

3.6 V

SMALL OUTLINE

2.7 V

70 Cel

0 Cel

DUAL

2.65 mm

7.5 mm

8

.032 MHz

15.4 mm

1

CMOS

3.15 V

1.27 mm

R-PDSO-G24

Not Qualified

5962-01-039-7297

Texas Instruments

TIMER, MEMORY REFRESH

NOT SPECIFIED

NOT SPECIFIED

CMOS

Not Qualified

NE555JG4

Texas Instruments

TIMER, MEMORY REFRESH

NOT SPECIFIED

NOT SPECIFIED

CMOS

DP8573AN

Texas Instruments

TIMER, REAL TIME CLOCK

INDUSTRIAL

THROUGH-HOLE

24

DIP

RECTANGULAR

PLASTIC/EPOXY

NO

PARALLEL

3/5

IN-LINE

DIP24,.3

Y

85 Cel

-40 Cel

DUAL

NOT SPECIFIED

NOT SPECIFIED

CMOS

1/100 SECOND

Timer or RTC

2.54 mm

R-PDIP-T24

Not Qualified

YES

SN72555N

Texas Instruments

TIMER, MEMORY REFRESH

NOT SPECIFIED

NOT SPECIFIED

CMOS

SE555CFH/883B

Texas Instruments

TIMER, MEMORY REFRESH

NOT SPECIFIED

NOT SPECIFIED

CMOS

TLC551CP3

Texas Instruments

NOT SPECIFIED

NOT SPECIFIED

CMOS

NE555L

Texas Instruments

TIMER, MEMORY REFRESH

NOT SPECIFIED

NOT SPECIFIED

CMOS

BQ4287EMT

Texas Instruments

COMMERCIAL

THROUGH-HOLE

24

DIP

RECTANGULAR

PLASTIC/EPOXY

NO

PARALLEL

5

IN-LINE

DIP24,.6

Y

70 Cel

0 Cel

DUAL

CMOS

SECONDS

5 V

Timer or RTC

2.54 mm

R-PDIP-T24

Not Qualified

NO

TLC551CDP3

Texas Instruments

NOT SPECIFIED

NOT SPECIFIED

CMOS

UA2240CNP3

Texas Instruments

NOT SPECIFIED

NOT SPECIFIED

CMOS

TLC551CJG

Texas Instruments

NOT SPECIFIED

NOT SPECIFIED

CMOS

SN72555L

Texas Instruments

TIMER, MEMORY REFRESH

NOT SPECIFIED

NOT SPECIFIED

CMOS

INS8253J

Texas Instruments

TIN LEAD

CMOS

e0

TLC552CD3

Texas Instruments

NOT SPECIFIED

NOT SPECIFIED

CMOS

BQ4285LPN

Texas Instruments

TIMER, REAL TIME CLOCK

INDUSTRIAL

THROUGH-HOLE

24

DIP

RECTANGULAR

PLASTIC/EPOXY

NO

PARALLEL, MUXED BUS

3.6 V

3.15

IN-LINE

DIP24,.6

Y

2.7 V

85 Cel

-40 Cel

DUAL

8

.032 MHz

1

CMOS

SECONDS

3.15 V

Timer or RTC

2.54 mm

R-PDIP-T24

Not Qualified

YES

TLC551CPP3

Texas Instruments

NOT SPECIFIED

NOT SPECIFIED

CMOS

SE555FK/883B

Texas Instruments

TIMER, MEMORY REFRESH

NOT SPECIFIED

NOT SPECIFIED

CMOS

UA2240CN3

Texas Instruments

NOT SPECIFIED

NOT SPECIFIED

CMOS

BQ4285EQ

Texas Instruments

TIMER, REAL TIME CLOCK

COMMERCIAL

J BEND

28

QCCJ

SQUARE

PLASTIC/EPOXY

YES

PARALLEL, MUXED BUS

5.5 V

5

CHIP CARRIER

LDCC28,.5SQ

Y

4.5 V

70 Cel

0 Cel

QUAD

8

.032 MHz

1

CMOS

SECONDS

5 V

Timer or RTC

1.27 mm

S-PQCC-J28

Not Qualified

YES

BQ4285LSN

Texas Instruments

TIMER, REAL TIME CLOCK

INDUSTRIAL

GULL WING

24

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

PARALLEL, MUXED BUS

3.6 V

3.15

SMALL OUTLINE

SOP24,.4

Y

2.7 V

85 Cel

-40 Cel

DUAL

8

.032 MHz

1

CMOS

SECONDS

3.15 V

Timer or RTC

1.27 mm

R-PDSO-G24

Not Qualified

YES

Timers & Real-Time Clocks

Timers and real-time clocks (RTCs) are electronic devices that are used to measure and track time intervals in electronic systems. They are crucial components in many applications, such as control systems, automation systems, and consumer electronics.

A timer is an electronic device that is used to measure the duration of time intervals. Timers can be either digital or analog and can be used to measure time intervals ranging from microseconds to hours or even days. They can be used for a variety of applications, such as controlling the duration of a signal or triggering an event after a specified time interval.

A real-time clock (RTC) is a clock that keeps track of the current time and date. Unlike a timer, an RTC is capable of keeping track of time even when the system is powered off. RTCs are commonly used in consumer electronics such as watches, clocks, and digital cameras, as well as in control systems, data loggers, and other applications that require accurate timekeeping.