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STK25CA8 View Datasheet(PDF) - Simtek Corporation

Part Name
Description
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STK25CA8 Datasheet PDF : 8 Pages
1 2 3 4 5 6 7 8
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 ICC 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
A15
MODULE
A16
DECODER
EEPROM ARRAY
512 x 512
A5
A6
STORE
A7
A8
A9
STATIC RAM
ARRAY
RECALL
A11
512 x 512
A12
A13
A14
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
COLUMN I/O
COLUMN DEC
A0 A1 A2 A3 A4 A10
STORE/
RECALL
CONTROL
VCC
POWER
CONTROL
G
E
W
PIN CONFIGURATIONS
NC 1
A16 2
A14 3
A12 4
A7 5
A6 6
A5 7
A4 8
A3 9
A2 10
A1 11
A0 12
DQ0 13
DQ1 14
DQ2 15
VSS 16
32 VCC
31 A15
30 NC
29 W
28 A13
27 A8
26 A9
25 A11
24 G
23 A10
22 E
21 DQ7
20
19
DQ6
DQ5
32 - 600 mil
18 DQ4 Dual In-Line
17 DQ3 Module
PIN NAMES
A0 - A16
W
Address Inputs
Write Enable
DQ0 - DQ7
E
Data In/Out
Chip Enable
G
Output Enable
VCC
Power (+ 5V)
VSS
Ground
August 1999
6-1
 

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