16 Clock Generators 1,112

Reset All
Part RoHS Manufacturer Peripheral IC Type Temperature Grade Terminal Form No. of Terminals Package Code Package Shape Package Body Material Surface Mount Maximum Supply Voltage Screening Level Address Bus Width Maximum Output Clock Frequency DAC Channels Power Supplies (V) Package Style (Meter) Package Equivalence Code Minimum Supply Voltage Maximum Operating Temperature Minimum Operating Temperature Terminal Finish ADC Channels Terminal Position DMA Channels Maximum Seated Height Width Additional Features External Data Bus Width Maximum Time At Peak Reflow Temperature (s) Peak Reflow Temperature (C) Length Total Dose (V) Technology Maximum Supply Current Nominal Supply Voltage PWM Channels Sub-Category ROM Programmability Terminal Pitch JESD-30 Code Moisture Sensitivity Level (MSL) Qualification Speed Nominal Primary Clock/Crystal Frequency JESD-609 Code No. of I/O Lines

ASM3P622S00EF-16-ST

Onsemi

CLOCK GENERATOR, OTHER

COMMERCIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.6 V

20 MHz

SMALL OUTLINE

3 V

70 Cel

0 Cel

DUAL

1.75 mm

3.9 mm

NOT SPECIFIED

NOT SPECIFIED

9.905 mm

CMOS

3.3 V

1.27 mm

R-PDSO-G16

Not Qualified

20 MHz

FS7140-01G-XTP

Onsemi

CLOCK GENERATOR, PROCESSOR SPECIFIC

COMMERCIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.6 V

300 MHz

3.3

SMALL OUTLINE

SOP16,.25

3 V

70 Cel

0 Cel

DUAL

1.7272 mm

3.937 mm

9.9314 mm

CMOS

3.3 V

Clock Generators

1.27 mm

R-PDSO-G16

Not Qualified

35 MHz

13715-102

Onsemi

CLOCK GENERATOR, OTHER

COMMERCIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.6 V

300 MHz

SMALL OUTLINE

3 V

70 Cel

0 Cel

DUAL

1.73 mm

3.9 mm

9.89 mm

CMOS

3.3 V

1.27 mm

R-PDSO-G16

Not Qualified

80 MHz

13715-201

Onsemi

CLOCK GENERATOR, OTHER

COMMERCIAL

GULL WING

16

SSOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.6 V

300 MHz

SMALL OUTLINE, SHRINK PITCH

3 V

70 Cel

0 Cel

DUAL

1.99 mm

5.29 mm

6.2 mm

CMOS

3.3 V

.65 mm

R-PDSO-G16

Not Qualified

80 MHz

PCS1P2859AG-16TR

Onsemi

CLOCK GENERATOR, OTHER

COMMERCIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.465 V

127 MHz

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

3.135 V

70 Cel

0 Cel

DUAL

1.2 mm

4.4 mm

5 mm

CMOS

3.3 V

.65 mm

R-PDSO-G16

Not Qualified

25 MHz

FS6131-01TR

Onsemi

COMMERCIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

5

SMALL OUTLINE

SOP16,.25

70 Cel

0 Cel

DUAL

CMOS

5 V

Clock Generators

1.27 mm

R-PDSO-G16

Not Qualified

ASM3P622S00EG-16-ST

Onsemi

CLOCK GENERATOR, OTHER

COMMERCIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.6 V

20 MHz

SMALL OUTLINE

3 V

70 Cel

0 Cel

DUAL

1.75 mm

3.9 mm

9.905 mm

CMOS

3.3 V

1.27 mm

R-PDSO-G16

Not Qualified

20 MHz

FS7140-01-XTP(16SSOP)

Onsemi

COMMERCIAL

GULL WING

16

SSOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.3

SMALL OUTLINE, SHRINK PITCH

SSOP16,.3

70 Cel

0 Cel

DUAL

CMOS

3.3 V

Clock Generators

.635 mm

R-PDSO-G16

Not Qualified

FS7140-01G(16SSOP)TR

Onsemi

COMMERCIAL

GULL WING

16

SSOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.3

SMALL OUTLINE, SHRINK PITCH

SSOP16,.25

70 Cel

0 Cel

DUAL

CMOS

3.3 V

Clock Generators

.635 mm

R-PDSO-G16

Not Qualified

PCS1P2860AG-16TR

Onsemi

CLOCK GENERATOR, OTHER

COMMERCIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.465 V

127 MHz

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

3.135 V

70 Cel

0 Cel

TIN

DUAL

1.2 mm

4.4 mm

30

260

5 mm

CMOS

3.3 V

.65 mm

R-PDSO-G16

1

Not Qualified

25 MHz

e3

PCS3P2191AF-16TR

Onsemi

CLOCK GENERATOR, OTHER

COMMERCIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.6 V

60 MHz

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

3 V

70 Cel

0 Cel

DUAL

1.2 mm

4.4 mm

5 mm

CMOS

3.3 V

.65 mm

R-PDSO-G16

Not Qualified

15 MHz

13715-808-XTP

Onsemi

CLOCK GENERATOR, OTHER

COMMERCIAL

GULL WING

16

SSOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.6 V

300 MHz

SMALL OUTLINE, SHRINK PITCH

3 V

70 Cel

0 Cel

Tin (Sn)

DUAL

1.99 mm

5.29 mm

6.2 mm

CMOS

3.3 V

.65 mm

R-PDSO-G16

2

Not Qualified

80 MHz

e3

ASM3P2855BG-16TR

Onsemi

CLOCK GENERATOR, OTHER

COMMERCIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.6 V

50 MHz

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

3 V

70 Cel

0 Cel

DUAL

1.2 mm

4.4 mm

5 mm

CMOS

3.3 V

.65 mm

R-PDSO-G16

Not Qualified

24 MHz

PCS3P2191AF-16TT

Onsemi

CLOCK GENERATOR, OTHER

COMMERCIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.6 V

60 MHz

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

3 V

70 Cel

0 Cel

DUAL

1.2 mm

4.4 mm

5 mm

CMOS

3.3 V

.65 mm

R-PDSO-G16

Not Qualified

15 MHz

PCS3P2191AG-16TT

Onsemi

CLOCK GENERATOR, OTHER

COMMERCIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.6 V

60 MHz

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

3 V

70 Cel

0 Cel

DUAL

1.2 mm

4.4 mm

5 mm

CMOS

3.3 V

.65 mm

R-PDSO-G16

Not Qualified

15 MHz

FS7140-01-XTD(16SOIC)

Onsemi

COMMERCIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.3

SMALL OUTLINE

SOP16,.25

70 Cel

0 Cel

DUAL

CMOS

3.3 V

Clock Generators

1.27 mm

R-PDSO-G16

Not Qualified

FS7145-XTD(16SOIC)

Onsemi

COMMERCIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.3

SMALL OUTLINE

SOP16,.25

70 Cel

0 Cel

DUAL

CMOS

3.3 V

Clock Generators

1.27 mm

R-PDSO-G16

Not Qualified

13715-201-XTD

Onsemi

CLOCK GENERATOR, OTHER

COMMERCIAL

GULL WING

16

SSOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.6 V

300 MHz

SMALL OUTLINE, SHRINK PITCH

3 V

70 Cel

0 Cel

TIN LEAD

DUAL

1.99 mm

5.29 mm

6.2 mm

CMOS

3.3 V

.65 mm

R-PDSO-G16

Not Qualified

80 MHz

e0

11825-818

Onsemi

CLOCK GENERATOR, OTHER

COMMERCIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.6 V

73.728 MHz

SMALL OUTLINE

3 V

70 Cel

0 Cel

DUAL

1.73 mm

3.9 mm

9.89 mm

CMOS

3.3 V

1.27 mm

R-PDSO-G16

Not Qualified

30 MHz

13715-802-XTP

Onsemi

CLOCK GENERATOR, OTHER

COMMERCIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.6 V

300 MHz

SMALL OUTLINE

3 V

70 Cel

0 Cel

TIN LEAD

DUAL

1.73 mm

3.9 mm

9.89 mm

CMOS

3.3 V

1.27 mm

R-PDSO-G16

Not Qualified

80 MHz

e0

ASM3P622S00EG-16-TR

Onsemi

CLOCK GENERATOR, OTHER

COMMERCIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.6 V

20 MHz

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

3 V

70 Cel

0 Cel

DUAL

1.2 mm

4.4 mm

5 mm

CMOS

3.3 V

.65 mm

R-PDSO-G16

Not Qualified

20 MHz

ASM3P2855BG-16TT

Onsemi

CLOCK GENERATOR, OTHER

COMMERCIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.6 V

50 MHz

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

3 V

70 Cel

0 Cel

DUAL

1.2 mm

4.4 mm

5 mm

CMOS

3.3 V

.65 mm

R-PDSO-G16

Not Qualified

24 MHz

FS6322-04

Onsemi

CLOCK GENERATOR, OTHER

COMMERCIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.6 V

48.00026 MHz

SMALL OUTLINE

3 V

70 Cel

0 Cel

DUAL

1.75 mm

3.9 mm

9.9 mm

CMOS

3.3 V

1.27 mm

R-PDSO-G16

Not Qualified

30 MHz

FS6322-02

Onsemi

CLOCK GENERATOR, OTHER

COMMERCIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.6 V

83.00071 MHz

SMALL OUTLINE

3 V

70 Cel

0 Cel

DUAL

1.75 mm

3.9 mm

CAN ALSO OPERATE AT 5V SUPPLY

9.9 mm

CMOS

3.3 V

1.27 mm

R-PDSO-G16

Not Qualified

30 MHz

PCS3I2191AG-16TR

Onsemi

INDUSTRIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.3

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

TSSOP16,.25

85 Cel

-40 Cel

DUAL

CMOS

26 mA

3.3 V

Clock Generators

.635 mm

R-PDSO-G16

Not Qualified

11640-837

Onsemi

CLOCK GENERATOR, OTHER

COMMERCIAL

GULL WING

16

SSOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.25 V

54 MHz

SMALL OUTLINE, SHRINK PITCH

4.75 V

70 Cel

0 Cel

DUAL

2 mm

5.3 mm

6.2 mm

CMOS

5 V

.65 mm

R-PDSO-G16

Not Qualified

18 MHz

ASM3I622S00EG-16-TT

Onsemi

CLOCK GENERATOR, OTHER

INDUSTRIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.6 V

20 MHz

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

3 V

85 Cel

-40 Cel

DUAL

1.1 mm

4.4 mm

5 mm

CMOS

3.3 V

.65 mm

R-PDSO-G16

20 MHz

11486-902

Onsemi

CLOCK GENERATOR, OTHER

INDUSTRIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

150 MHz

SMALL OUTLINE

4.5 V

85 Cel

-40 Cel

DUAL

1.73 mm

3.9 mm

ALSO OPERATES AT 3.3V SUPPLY

9.89 mm

CMOS

5 V

1.27 mm

R-PDSO-G16

Not Qualified

27 MHz

FS7140-01G-XTD(16SSOP)

Onsemi

CLOCK GENERATOR, PROCESSOR SPECIFIC

COMMERCIAL

GULL WING

16

SSOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.6 V

300 MHz

3.3

SMALL OUTLINE, SHRINK PITCH

SSOP16,.3

3 V

70 Cel

0 Cel

DUAL

2.79 mm

6.2 mm

CMOS

3.3 V

Clock Generators

.635 mm

R-PDSO-G16

Not Qualified

35 MHz

11486-801

Onsemi

CLOCK GENERATOR, PROCESSOR SPECIFIC

COMMERCIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

150 MHz

SMALL OUTLINE

4.5 V

70 Cel

0 Cel

TIN LEAD

DUAL

1.73 mm

3.9 mm

ALSO OPERATES AT 3.3V SUPPLY

9.89 mm

CMOS

5 V

1.27 mm

R-PDSO-G16

Not Qualified

27 MHz

e0

FS7145-01-XTD

Onsemi

CLOCK GENERATOR, PROCESSOR SPECIFIC

COMMERCIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.6 V

300 MHz

3.3

SMALL OUTLINE

SOP16,.25

3 V

70 Cel

0 Cel

DUAL

1.7272 mm

3.937 mm

9.9314 mm

CMOS

3.3 V

Clock Generators

1.27 mm

R-PDSO-G16

1

Not Qualified

35 MHz

FS6377-01

Onsemi

CLOCK GENERATOR, OTHER

COMMERCIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

150 MHz

3.3/5

SMALL OUTLINE

SOP16,.25

4.5 V

70 Cel

0 Cel

Tin/Lead (Sn/Pb)

DUAL

1.73 mm

3.9 mm

ALSO OPERATES AT 3.3V SUPPLY

30

240

9.89 mm

CMOS

5 V

Clock Generators

1.27 mm

R-PDSO-G16

Not Qualified

27 MHz

e0

PCS1P2858AG-16TR

Onsemi

CLOCK GENERATOR, OTHER

COMMERCIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.465 V

27 MHz

3.3

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

TSSOP16,.25

3.135 V

70 Cel

0 Cel

DUAL

1.2 mm

4.4 mm

5 mm

CMOS

30 mA

3.3 V

Clock Generators

.65 mm

R-PDSO-G16

Not Qualified

27 MHz

11486-901

Onsemi

CLOCK GENERATOR, PROCESSOR SPECIFIC

INDUSTRIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

150 MHz

SMALL OUTLINE

4.5 V

85 Cel

-40 Cel

DUAL

1.73 mm

3.9 mm

ALSO OPERATES AT 3.3V SUPPLY

9.89 mm

CMOS

5 V

1.27 mm

R-PDSO-G16

Not Qualified

27 MHz

FS7140-01(16SSOP)

Onsemi

COMMERCIAL

GULL WING

16

SSOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.3

SMALL OUTLINE, SHRINK PITCH

SSOP16,.3

70 Cel

0 Cel

DUAL

CMOS

3.3 V

Clock Generators

.635 mm

R-PDSO-G16

Not Qualified

11486-912

Onsemi

CLOCK GENERATOR, OTHER

COMMERCIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

150 MHz

SMALL OUTLINE

4.5 V

70 Cel

0 Cel

MATTE TIN/NICKEL PALLADIUM GOLD

DUAL

1.73 mm

3.9 mm

ALSO OPERATES AT 3.3V SUPPLY

40

260

9.89 mm

CMOS

5 V

1.27 mm

R-PDSO-G16

Not Qualified

27 MHz

e3/e4

FS6377-01I

Onsemi

CLOCK GENERATOR, OTHER

INDUSTRIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

150 MHz

3.3/5

SMALL OUTLINE

SOP16,.25

4.5 V

85 Cel

-40 Cel

Tin/Lead (Sn/Pb)

DUAL

1.73 mm

3.9 mm

ALSO OPERATES AT 3.3V SUPPLY

30

240

9.89 mm

CMOS

5 V

Clock Generators

1.27 mm

R-PDSO-G16

Not Qualified

27 MHz

e0

11825-808

Onsemi

CLOCK GENERATOR, OTHER

COMMERCIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.6 V

73.728 MHz

SMALL OUTLINE

3 V

70 Cel

0 Cel

DUAL

1.73 mm

3.9 mm

9.89 mm

CMOS

3.3 V

1.27 mm

R-PDSO-G16

Not Qualified

30 MHz

FS7140-01-XTP(16SOIC)

Onsemi

COMMERCIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.3

SMALL OUTLINE

SOP16,.25

70 Cel

0 Cel

DUAL

CMOS

3.3 V

Clock Generators

1.27 mm

R-PDSO-G16

Not Qualified

11274-911

Onsemi

CLOCK GENERATOR, OTHER

INDUSTRIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

230 MHz

SMALL OUTLINE

4.5 V

85 Cel

-40 Cel

DUAL

1.75 mm

3.9 mm

9.9 mm

CMOS

5 V

1.27 mm

R-PDSO-G16

Not Qualified

28 MHz

NB3V63143GXXMNR2G

Onsemi

CLOCK GENERATOR, OTHER

INDUSTRIAL

NO LEAD

16

HVQCCN

SQUARE

PLASTIC/EPOXY

YES

1.9 V

200 MHz

CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE

LCC16,.12SQ,20

1.7 V

85 Cel

-40 Cel

QUAD

1 mm

3 mm

NOT SPECIFIED

NOT SPECIFIED

3 mm

CMOS

1.8 V

.5 mm

S-PQCC-N16

50 MHz

FS7145-XTD(16SSOP)

Onsemi

COMMERCIAL

GULL WING

16

SSOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.3

SMALL OUTLINE, SHRINK PITCH

SSOP16,.3

70 Cel

0 Cel

DUAL

CMOS

3.3 V

Clock Generators

.635 mm

R-PDSO-G16

Not Qualified

PCS1P2860AG-16TT

Onsemi

CLOCK GENERATOR, OTHER

COMMERCIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.465 V

127 MHz

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

3.135 V

70 Cel

0 Cel

DUAL

1.2 mm

4.4 mm

5 mm

CMOS

3.3 V

.65 mm

R-PDSO-G16

Not Qualified

25 MHz

11575-801-XTD

Onsemi

CLOCK GENERATOR, OTHER

COMMERCIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

150 MHz

SMALL OUTLINE

4.5 V

70 Cel

0 Cel

DUAL

1.73 mm

3.9 mm

OPERATES AT 3.3V MINIMUM SUPPLY

9.89 mm

CMOS

5 V

1.27 mm

R-PDSO-G16

Not Qualified

27 MHz

11825-804

Onsemi

CLOCK GENERATOR, OTHER

COMMERCIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.6 V

54 MHz

SMALL OUTLINE

3 V

70 Cel

0 Cel

DUAL

1.73 mm

3.9 mm

9.89 mm

CMOS

3.3 V

1.27 mm

R-PDSO-G16

Not Qualified

15 MHz

13715-805-XTD

Onsemi

CLOCK GENERATOR, OTHER

COMMERCIAL

GULL WING

16

SSOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.6 V

300 MHz

SMALL OUTLINE, SHRINK PITCH

3 V

70 Cel

0 Cel

MATTE TIN/NICKEL PALLADIUM GOLD

DUAL

1.99 mm

5.29 mm

40

260

6.2 mm

CMOS

3.3 V

.65 mm

R-PDSO-G16

Not Qualified

80 MHz

e3/e4

FS6131-01I

Onsemi

CLOCK GENERATOR, OTHER

INDUSTRIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

230 MHz

SMALL OUTLINE

4.5 V

85 Cel

-40 Cel

DUAL

1.73 mm

3.9 mm

9.89 mm

CMOS

5 V

1.27 mm

R-PDSO-G16

28 MHz

11825-112

Onsemi

CLOCK GENERATOR, OTHER

COMMERCIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.6 V

48.00026 MHz

SMALL OUTLINE

3 V

70 Cel

0 Cel

DUAL

1.73 mm

3.9 mm

9.9 mm

CMOS

3.3 V

1.27 mm

R-PDSO-G16

Not Qualified

30 MHz

Clock Generators

A clock generator is an electronic circuit that generates an electrical signal that serves as a timing reference for other circuits in a system. Clock generators are used in many electronic devices, such as computers, cell phones, and digital cameras. The clock signal is used to synchronize the operation of different components in the system, such as microprocessors, memory devices, and input/output interfaces.

Clock generators can be classified based on their output frequency and stability. Some clock generators produce a fixed frequency output, while others have a programmable output frequency. The stability of the clock signal is also an important parameter, and clock generators can be designed to produce a stable frequency output over a wide range of temperature and voltage conditions.

Clock generators can also include additional features such as frequency multiplication, frequency division, and phase locking. Frequency multiplication allows the output frequency to be multiplied by an integer value, while frequency division allows the output frequency to be divided by an integer value. Phase locking is used to ensure that the output frequency of the clock generator is synchronized with an external reference signal.