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STK25CA8 Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers

Part No. STK25CA8
Description  128K x 8 AutoStore nvSRAM CMOS Nonvolatile Static RAM Module
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Maker  ETC [List of Unclassifed Manufacturers]
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STK25CA8 Datasheet(HTML) 1 Page - List of Unclassifed Manufacturers

   
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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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