81C55 View Datasheet(PDF) - Intersil

Part Name

Description

Manufacturer

81C55

Radiation Hardened 256 x 8 CMOS RAM

Intersil 

HS-81C55RH, HS-81C56RH

Pinouts

40 LEAD DUAL-IN-LINE METAL SEAL PACKAGE (SBDIP)

MIL-STD-1835 CDIP2-T40

TOP VIEW

PC3 1

PC4 2

TIMER IN 3

RESET 4

PC5 5

TIMER OUT 6

IO / M 7

CE or CE† 8

RD 9

WR 10

ALE 11

AD0 12

AD1 13

AD2 14

AD3 15

AD4 16

AD5 17

AD6 18

AD7 19

GND 20

40 VDD

39 PC2

38 PC1

37 PC0

36 PB7

35 PB6

34 PB5

33 PB4

32 PB3

31 PB2

30 PB1

29 PB0

28 PA7

27 PA6

26 PA5

25 PA4

24 PA3

23 PA2

22 PA1

21 PA0

42 LEAD CERAMIC METAL SEAL FLATPACK PACKAGE

INTERSIL OUTLINE K42.A

TOP VIEW

PC3

1

PC4

2

TIMER IN

3

RESET

4

PC5

5

TIMER OUT

6

IO/M

7

CE OR CE

8

RD

9

WR

10

ALE

11

AD0

12

AD1

13

AD2

14

AD3

15

NC

16

AD4

17

AD5

18

AD6

19

AD7

20

GND

21

42

VDD

41

PC2

40

PC1

39

PC0

38

PB7

37

PB6

36

PB5

35

PB4

34

PB3

33

PB2

32

PB1

31

PB0

30

PA7

29

PA6

28

PA5

27

NC

26

PA4

25

PA3

24

PA2

23

PA1

22

PA0

† 81C55RH = CE

81C56RH = CE

2

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