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STK15C88 Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers

Part No. STK15C88
Description  32K x 8 AutoStore nvSRAM High Performance CMOS Nonvolatile Static RAM
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STK15C88 Datasheet(HTML) 1 Page - List of Unclassifed Manufacturers

   
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August 1998
5-35
STK15C88
32K x 8
AutoStore™ nvSRAM
High Performance CMOS
Nonvolatile Static RAM
FEATURES
• Nonvolatile Storage Without Battery Problems
• Directly Replaces 32K x 8 static RAM, Battery
Backed RAM or EEPROM
• 25ns, 35ns and 45ns Access Times
• Store to EEPROM Initiated by Software or
AutoStore™ on Power Down
• Recall to SRAM by Software or Power Restore
• 15mA 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 Industrial
Temperature Range
• Commercial and Industrial Temp. Ranges
• 28 Pin 600 or 300 mil PDIP and 350 mil SOIC
DESCRIPTION
The Simtek STK15C88 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
EEPROM. Data transfers from the SRAM to the
EEPROM (the
STORE operation) can take place
automatically on power down using charge stored in
system capacitance. Transfers from the EEPROM to
the SRAM (the
RECALL operation) take place auto-
matically on restoration of power. Initiation of
STORE and RECALL cycles can also be controlled
by entering control sequences on the SRAM inputs.
BLOCK DIAGRAM
RECALL
STORE/
CONTROL
CONTROL
VCC
POWER
013
A
A
DETECT
SOFTWARE
STORE
2
COLUMN I/O
1
A
RECALL
DQ
A
0
A
COLUMN DEC
DQ
10
5
9
A
A
4
3
DQ
STATIC RAM
3
4
A
256 x 1024
A
5
DQ
DQ
6
A
7
2
DQ
A
13
12
A
11
A
14
A
DQ
256 x 1024
A
8
ARRAY
A
0
EEPROM ARRAY
7
6
A
1
DQ
W
E
G
PIN NAMES
A0 - A14
Address Inputs
W
Write Enable
DQ0 - DQ7
Data In/Out
E
Chip Enable
G
Output Enable
VCC
Power (+5V)
VSS
Ground
26
20
24
27
19
18
15
22
25
23
16
17
21
28
DQ
DQ
4
DQ
3
E
7
DQ
DQ 6
5
A10
A
A
A
A
11
13
8
9
G
CC
V
14
3
2
A
0
DQ
DQ
V
0
1
1
2
A
SS
A
DQ
A
A
A 7
14
A
A 6
12
5
A
A 4
W
11
2
1
3
7
13
8
12
10
6
9
4
5
28 - 300 PDIP
28 - 600 PDIP
28 - 350 SOIC
28 - 300 SOIC
PIN CONFIGURATIONS


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