1

Features

• Pin Compatible with NMOS 8255A

• 24 Programmable I/O Pins

• Fully TTL Compatible

• High Speed, No “Wait State” Operation with 5MHz

• Direct Bit Set/Reset Capability

• Enhanced Control Word Read Capability

• L7 Process

• 2.5mA Drive Capability on All I/O Ports

• Low Standby Power (ICCSB) . . . . . . . . . . . . . . . . .10

µA

Description

the industry standard 8255A and is manufactured using a

self-aligned silicon gate CMOS process (Scaled SAJI IV). It

is a general purpose programmable I/O device which may be

used with many different microprocessors. There are 24 I/O

pins which may be individually programmed in 2 groups of

12 and used in 3 major modes of operation. The high

performance and industry standard configuration of the

make it compatible with the 80C86, and

other microprocessors.

Static CMOS circuit design insures low operating power. TTL

compatibility over the full military temperature range and bus

hold circuitry eliminate the need for pull-up resistors. The

advanced SAJI process results in performance equal

to or greater than existing functionally equivalent products at

a fraction of the power.

PA3

PA2

PA1

PA0

RD

CS

GND

A1

A0

PC7

PC6

PC5

PC4

PC0

PC1

PC2

PC3

PB0

PB1

PB2

PA4

PA5

PA6

PA7

WR

RESET

D0

D1

D2

D3

D4

D5

D6

D7

PB7

PB6

PB5

PB4

PB3

13

1

2

3

4

5

6

7

8

9

10

11

12

14

15

16

17

18

19

20

28

40

39

38

37

36

35

34

33

32

31

30

29

27

26

25

24

23

22

21

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

Wing Shing Computer Components Co., (H.K.)Ltd.

Tel:(852)2341 9276

Fax:(852)2797 8153

E-mail:

wsccltd@hkstar.com

33

32

31

30

29

28

27

RESET

CS

GND

1

2

3

4

5

6

7

26

25

24

23

8

9

10

11

CS

GND

A1

A0

PC7

PC6

PC5

PC4

PC0

PC1

NC

RESET

D0

D1

D2

D3

D4

D5

D6

D7

NC

44 43 42 41 40

39

38

37

36

35

34

33

32

31

30

29

28

27

1

2

3

4

5

6

26

25

24

23

22

21

20

19

18

7

8

9

10

11

12

13

14

15

16

17

CMOS Programmable peripheral

Interface

80C86

DIP-40

Pinouts

SPEED

QFP-44

44 QFP

44 PLCC

0 C to 70 C

0 C to 70 C

o

o

o

o

PLCC-44

WS82C55A-5P

WS82C55A-5Q

WS82C55A-5C

WS82C55A-5P

WS82C55A-5Q

WS82C55A-5C

0 C to 70 C

o

o

PKG.

TEMPERATURE

RANGE

SPEED

8MHz

8MHz

8MHz

5MHz

5MHz

5MHz

PART NUMBERS

PART NUMBERS

40DIP

Ordering Information

and 8MHz 80C88

The WS82C55A is a high performance CMOS version of

WS82C55A

WS82C55A

WS82C55AP

WS82C55AC

WS82C55AQ

WS82C55AP

WS82C55AQ

WS82C55AC