CY7C1021B

Document #: 38-05145 Rev. *C

Page 2 of 10

Pin Configurations

Selection Guide

-12

-15

Maximum Access Time (ns)

12

15

Maximum Operating Current (mA)

Com’l/Ind’l

140

130

Automotive

130

Maximum CMOS Standby Current (mA)

Com’l/Ind’l

10

10

Automotive

15

L Version

0.5

0.5

WE

1

2

3

4

5

6

7

8

9

10

11

14

31

32

36

35

34

33

37

40

39

38

Top View

SOJ/TSOP II

12

13

41

44

43

42

16

15

29

30

NC

OE

CE

BHE

NC

18

17

20

19

27

28

25

26

22

21

23

24

NC

BLE

Pin Definitions

Pin Name

SOJ, TSOP–Pin Number

I/O Type

Description

1–5,18–21, 24–27, 42–44

Input

Address Inputs used to select one of the address locations.

7–10, 13–16, 29–32,

35–38

Input/Output Bidirectional Data I/O lines. Used as input or output lines depending

on operation.

NC

22, 23, 28

No Connect

No Connects. Not connected to the die.

WE

17

Input/Control Write Enable Input, active LOW. When selected LOW, a Write is

conducted. When deselected HIGH, a Read is conducted.

CE

6

Input/Control Chip Enable Input, active LOW. When LOW, selects the chip. When

HIGH, deselects the chip.

BHE, BLE

40, 39

OE

41

Input/Control Output Enable, active LOW. Controls the direction of the I/O pins.

When LOW, the I/O pins are allowed to behave as outputs. When

deasserted HIGH, I/O pins are tri-stated, and act as input data pins.

12, 34

Ground

Ground for the device. Should be connected to ground of the

system.

11, 33

Power Supply Power Supply inputs to the device.

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