STK25CA8-D45I datasheet(1/8 Pages) ETC

部件名	STK25CA8-D45I

功能描述	128K x 8 AutoStore nvSRAM CMOS Nonvolatile Static RAM Module

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August 1999

6-1

PIN CONFIGURATIONS

PIN NAMES

A0 - A16

Address Inputs

W

Write Enable

DQ0 - DQ7

Data In/Out

E

Chip Enable

G

Output Enable

VCC

Power (+ 5V)

VSS

Ground

A13

A8

A9

A11

NC

A16

A12

A7

A6

A5

A4

A3

A2

A1

A0

DQ0

DQ1

DQ2

VSS

VCC

A15

W

A10

E

DQ7

DQ6

DQ5

DQ4

DQ3

NC

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

32

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

A14

VCC

A15

G

A10

E

DQ7

DQ6

DQ5

DQ4

DQ3

NC

STK25CA8

128K x 8

AutoStore™ nvSRAM

QuantumTrap™ CMOS

Nonvolatile Static RAM Module

FEATURES

• Nonvolatile Storage without Battery Problems

• Directly Replaces 128K x 8 Static RAM, Battery-

Backed RAM or EEPROM

• 35ns and 45ns Access Times

•

STORE to EEPROM Initiated by AutoStore™

on Power Down

•

RECALL to SRAM on Power Restore

• 22mA I

CC at 200ns Cycle Time

• Unlimited READ, WRITE and

RECALL Cycles

• 1,000,000

STORE Cycles to EEPROM

• 100-Year Data Retention Over Full Commercial

Temperature Range

• Commercial and Industrial Temperatures

• 32-Pin 600 mil Dual In-Line Module

DESCRIPTION

The Simtek STK25CA8 is a fast static RAM with a

nonvolatile, electrically erasable PROM element

incorporated in each static memory cell. The SRAM

can be read and written an unlimited number of

times, while independent nonvolatile data resides in

the EEPROM. Data transfers from the SRAM to the

EEPROM

(the STORE operation) can take place auto-

matically on power down using charge stored in sys-

tem capacitance. Transfers from the EEPROM to the

SRAM

(the RECALL operation) take place automati-

cally on restoration of power.

BLOCK DIAGRAM

A6

A7

A2

COLUMN I/O

COLUMN DEC

STATIC RAM

ARRAY

512 x 512

EEPROM ARRAY

512 x 512

STORE/

RECALL

CONTROL

POWER

CONTROL

A11

A12

A13

A14

DQ0

DQ1

DQ2

DQ3

DQ4

DQ5

DQ6

DQ7

VCC

G

E

W

A9

A8

A10

A3

A0 A1

A4

A5

A15

A16

MODULE

DECODER

512 x 512

STORE

RECALL

32 - 600 mil

Dual In-Line

Module

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