16 Parallel I/O Ports 714

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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 No. of Bits Bit Size Power Supplies (V) Package Style (Meter) Package Equivalence Code Minimum Supply Voltage Maximum Operating Temperature CPU Family Minimum Operating Temperature Terminal Finish Ultraviolet Erasable Terminal Position No. of Ports Maximum Seated Height ROM 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) ROM Bits Size No. of Timers RAM Bytes Technology Maximum Supply Current Nominal Supply Voltage Memory Organization Sub-Category ROM Programmability Terminal Pitch JESD-30 Code Moisture Sensitivity Level (MSL) Qualification Speed JESD-609 Code Maximum Standby Current No. of I/O Lines Maximum Access Time

935275049518

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE

2.3 V

85 Cel

-40 Cel

DUAL

1

2.65 mm

7.5 mm

10.3 mm

CMOS

3 V

1.27 mm

R-PDSO-G16

8

935270674112

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE

2.3 V

85 Cel

-40 Cel

NICKEL PALLADIUM GOLD

DUAL

1

1.75 mm

3.9 mm

9.9 mm

CMOS

1.27 mm

R-PDSO-G16

1

Not Qualified

e4

8

935282747118

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

2.3 V

85 Cel

-40 Cel

DUAL

1

1.1 mm

4.4 mm

5 mm

CMOS

3 V

.65 mm

R-PDSO-G16

8

935275051118

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

2.3 V

85 Cel

-40 Cel

NICKEL PALLADIUM GOLD

DUAL

1

1.1 mm

4.4 mm

30

260

5 mm

CMOS

3 V

.65 mm

R-PDSO-G16

1

e4

8

935283047118

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

NO LEAD

16

HVQCCN

SQUARE

PLASTIC/EPOXY

YES

5.5 V

CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE

2.3 V

85 Cel

-40 Cel

QUAD

1

1 mm

3 mm

3 mm

CMOS

3 V

.5 mm

S-PQCC-N16

8

935276422518

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE

2.3 V

85 Cel

-40 Cel

DUAL

1

2.65 mm

7.5 mm

10.3 mm

CMOS

3 V

1.27 mm

R-PDSO-G16

8

935272775118

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

NO LEAD

16

HVQCCN

SQUARE

PLASTIC/EPOXY

YES

5.5 V

CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE

2.3 V

85 Cel

-40 Cel

NICKEL PALLADIUM GOLD

QUAD

1

1 mm

4 mm

4 mm

CMOS

.65 mm

S-PQCC-N16

1

Not Qualified

e4

8

935271534118

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.6 V

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

2.5 V

85 Cel

-40 Cel

NICKEL PALLADIUM GOLD

DUAL

1

1.1 mm

4.4 mm

5 mm

CMOS

3.3 V

.65 mm

R-PDSO-G16

1

Not Qualified

e4

8

935269201112

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

SSOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE, SHRINK PITCH

2.3 V

85 Cel

-40 Cel

NICKEL PALLADIUM GOLD

DUAL

1

2 mm

5.3 mm

6.2 mm

CMOS

3 V

.65 mm

R-PDSO-G16

1

Not Qualified

e4

8

935283049118

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

NO LEAD

16

HVQCCN

SQUARE

PLASTIC/EPOXY

YES

5.5 V

CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE

2.3 V

85 Cel

-40 Cel

NICKEL PALLADIUM GOLD

QUAD

1

1 mm

3 mm

30

260

3 mm

CMOS

3 V

.5 mm

S-PQCC-N16

1

e4

8

935282715512

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE

2.3 V

85 Cel

-40 Cel

DUAL

1

2.65 mm

7.5 mm

10.3 mm

CMOS

3 V

1.27 mm

R-PDSO-G16

8

935269195118

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE

2.3 V

85 Cel

-40 Cel

NICKEL PALLADIUM GOLD

DUAL

1

2.65 mm

7.5 mm

10.3 mm

CMOS

3 V

1.27 mm

R-PDSO-G16

1

Not Qualified

e4

8

935282735118

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

2.3 V

85 Cel

-40 Cel

DUAL

1

1.1 mm

4.4 mm

5 mm

CMOS

3 V

.65 mm

R-PDSO-G16

8

933851670112

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

THROUGH-HOLE

16

DIP

RECTANGULAR

PLASTIC/EPOXY

NO

6 V

IN-LINE

2.5 V

85 Cel

-40 Cel

NICKEL PALLADIUM GOLD

DUAL

1

4.2 mm

7.62 mm

19.025 mm

CMOS

5 V

2.54 mm

R-PDIP-T16

Not Qualified

e4

8

935269193118

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

SSOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE, SHRINK PITCH

2.3 V

85 Cel

-40 Cel

NICKEL PALLADIUM GOLD

DUAL

1

2 mm

5.3 mm

6.2 mm

CMOS

3 V

.65 mm

R-PDSO-G16

1

Not Qualified

e4

8

935283761118

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

2.3 V

85 Cel

-40 Cel

DUAL

1

1.1 mm

4.4 mm

5 mm

CMOS

3 V

.65 mm

R-PDSO-G16

8

935269202112

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

2.3 V

85 Cel

-40 Cel

NICKEL PALLADIUM GOLD

DUAL

1

1.1 mm

4.4 mm

5 mm

CMOS

3 V

.65 mm

R-PDSO-G16

1

Not Qualified

e4

8

935282743112

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

2.3 V

85 Cel

-40 Cel

DUAL

1

1.1 mm

4.4 mm

5 mm

CMOS

3 V

.65 mm

R-PDSO-G16

8

935282741518

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE

2.3 V

85 Cel

-40 Cel

DUAL

1

2.65 mm

7.5 mm

10.3 mm

CMOS

3 V

1.27 mm

R-PDSO-G16

8

935277417118

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

NO LEAD

16

HVQCCN

SQUARE

PLASTIC/EPOXY

YES

5.5 V

CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE

2.3 V

85 Cel

-40 Cel

QUAD

1

1 mm

4 mm

4 mm

CMOS

3 V

.65 mm

S-PQCC-N16

8

935276422528

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE

2.3 V

85 Cel

-40 Cel

DUAL

1

2.65 mm

7.5 mm

10.3 mm

CMOS

3 V

1.27 mm

R-PDSO-G16

8

935275581112

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

6 V

SMALL OUTLINE

2.5 V

85 Cel

-40 Cel

DUAL

1

2.65 mm

7.5 mm

10.3 mm

CMOS

5 V

1.27 mm

R-PDSO-G16

Not Qualified

8

935275581118

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

6 V

SMALL OUTLINE

2.5 V

85 Cel

-40 Cel

DUAL

1

2.65 mm

7.5 mm

10.3 mm

CMOS

5 V

1.27 mm

R-PDSO-G16

Not Qualified

8

935282736518

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE

2.3 V

85 Cel

-40 Cel

DUAL

1

2.65 mm

7.5 mm

10.3 mm

CMOS

3 V

1.27 mm

R-PDSO-G16

8

935275051112

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

2.3 V

85 Cel

-40 Cel

NICKEL PALLADIUM GOLD

DUAL

1

1.1 mm

4.4 mm

30

260

5 mm

CMOS

3 V

.65 mm

R-PDSO-G16

1

e4

8

935262899112

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

COMMERCIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.6 V

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

3 V

70 Cel

0 Cel

NICKEL PALLADIUM GOLD

DUAL

1

1.1 mm

4.4 mm

5 mm

CMOS

3.3 V

.65 mm

R-PDSO-G16

1

Not Qualified

e4

8

935276423528

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE

2.3 V

85 Cel

-40 Cel

DUAL

1

2.65 mm

7.5 mm

10.3 mm

CMOS

3 V

1.27 mm

R-PDSO-G16

8

935270669112

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

2.3 V

85 Cel

-40 Cel

Nickel/Palladium/Gold (Ni/Pd/Au)

DUAL

1

1.1 mm

4.4 mm

30

260

5 mm

CMOS

.65 mm

R-PDSO-G16

1

Not Qualified

e4

8

935270674118

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE

2.3 V

85 Cel

-40 Cel

NICKEL PALLADIUM GOLD

DUAL

1

1.75 mm

3.9 mm

9.9 mm

CMOS

1.27 mm

R-PDSO-G16

1

Not Qualified

e4

8

935269192112

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE

2.3 V

85 Cel

-40 Cel

NICKEL PALLADIUM GOLD

DUAL

1

2.65 mm

7.5 mm

10.3 mm

CMOS

3 V

1.27 mm

R-PDSO-G16

1

Not Qualified

e4

8

935285892118

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE

2.3 V

85 Cel

-40 Cel

DUAL

1

1.75 mm

3.9 mm

9.9 mm

CMOS

1.27 mm

R-PDSO-G16

8

935283485512

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE

2.3 V

85 Cel

-40 Cel

DUAL

1

2.65 mm

7.5 mm

10.3 mm

CMOS

3 V

1.27 mm

R-PDSO-G16

8

935282746518

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE

2.3 V

85 Cel

-40 Cel

DUAL

1

2.65 mm

7.5 mm

10.3 mm

CMOS

3 V

1.27 mm

R-PDSO-G16

8

935282743118

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

2.3 V

85 Cel

-40 Cel

DUAL

1

1.1 mm

4.4 mm

5 mm

CMOS

3 V

.65 mm

R-PDSO-G16

8

935283489512

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE

2.3 V

85 Cel

-40 Cel

DUAL

1

2.65 mm

7.5 mm

10.3 mm

CMOS

3 V

1.27 mm

R-PDSO-G16

8

935282742112

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

THROUGH-HOLE

16

DIP

RECTANGULAR

PLASTIC/EPOXY

NO

5.5 V

IN-LINE

2.3 V

85 Cel

-40 Cel

DUAL

1

4.7 mm

7.62 mm

21.6 mm

CMOS

3 V

2.54 mm

R-PDIP-T16

8

935282747112

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

2.3 V

85 Cel

-40 Cel

DUAL

1

1.1 mm

4.4 mm

5 mm

CMOS

3 V

.65 mm

R-PDSO-G16

8

935282746512

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE

2.3 V

85 Cel

-40 Cel

DUAL

1

2.65 mm

7.5 mm

10.3 mm

CMOS

3 V

1.27 mm

R-PDSO-G16

8

935272003115

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

NO LEAD

16

HVQCCN

SQUARE

PLASTIC/EPOXY

YES

5.5 V

CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE

2.3 V

85 Cel

-40 Cel

QUAD

1

1 mm

4 mm

4 mm

CMOS

3 V

.65 mm

S-PQCC-N16

8

935285896118

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

2.3 V

85 Cel

-40 Cel

DUAL

1

1.1 mm

4.4 mm

5 mm

CMOS

3 V

.65 mm

R-PDSO-G16

8

935283489112

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE

2.3 V

85 Cel

-40 Cel

DUAL

1

2.65 mm

7.5 mm

10.3 mm

CMOS

3 V

1.27 mm

R-PDSO-G16

8

933728080112

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

SOP

RECTANGULAR

PLASTIC/EPOXY

YES

6 V

SMALL OUTLINE

2.5 V

85 Cel

-40 Cel

DUAL

1

2.65 mm

7.5 mm

NOT SPECIFIED

NOT SPECIFIED

10.3 mm

CMOS

5 V

1.27 mm

R-PDSO-G16

Not Qualified

8

935262899118

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

COMMERCIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.6 V

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

3 V

70 Cel

0 Cel

NICKEL PALLADIUM GOLD

DUAL

1

1.1 mm

4.4 mm

5 mm

CMOS

3.3 V

.65 mm

R-PDSO-G16

1

Not Qualified

e4

8

935276427118

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

2.3 V

85 Cel

-40 Cel

DUAL

1

1.1 mm

4.4 mm

5 mm

CMOS

.65 mm

R-PDSO-G16

8

935271534112

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

3.6 V

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

2.5 V

85 Cel

-40 Cel

NICKEL PALLADIUM GOLD

DUAL

1

1.1 mm

4.4 mm

5 mm

CMOS

3.3 V

.65 mm

R-PDSO-G16

1

Not Qualified

e4

8

935279918118

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

SSOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE, SHRINK PITCH

2.3 V

85 Cel

-40 Cel

DUAL

1

2 mm

5.3 mm

6.2 mm

CMOS

3 V

.65 mm

R-PDSO-G16

8

935283188112

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

THROUGH-HOLE

16

DIP

RECTANGULAR

PLASTIC/EPOXY

NO

5.5 V

IN-LINE

2.3 V

85 Cel

-40 Cel

DUAL

1

4.7 mm

7.62 mm

21.6 mm

CMOS

3 V

2.54 mm

R-PDIP-T16

8

935277419112

NXP Semiconductors

PARALLEL IO PORT, GENERAL PURPOSE

INDUSTRIAL

GULL WING

16

TSSOP

RECTANGULAR

PLASTIC/EPOXY

YES

5.5 V

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

2.3 V

85 Cel

-40 Cel

DUAL

1

1.1 mm

4.4 mm

5 mm

CMOS

3 V

.65 mm

R-PDSO-G16

8

Parallel I/O Ports

Parallel I/O (Input/Output) ports are a type of interface that allows a microcontroller or microprocessor to communicate with other devices in a parallel fashion. This means that multiple bits of data can be transmitted or received simultaneously, as opposed to serial communication which transmits or receives data one bit at a time.

Parallel I/O ports are commonly found in a wide range of electronic devices, including computers, printers, and industrial control systems. They typically consist of a number of input and output lines, with each line representing a single bit of data. The number of lines can vary depending on the specific device, with some systems having only a few lines while others may have dozens or even hundreds.

One of the advantages of parallel I/O ports is their ability to transfer large amounts of data quickly and efficiently. This makes them particularly useful in applications where real-time data acquisition or high-speed communication is required. For example, parallel ports are commonly used in printers and other peripherals to transfer large amounts of data quickly.

However, one of the limitations of parallel I/O ports is that they require a large number of pins on the microcontroller or microprocessor to accommodate all of the data lines. This can make them difficult to implement in systems with limited space or where a large number of I/O lines are required. In addition, parallel I/O ports can be more susceptible to noise and interference compared to serial communication, which can affect data integrity and transmission speeds.