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| STK15C88 Datasheet, PDF (1/9 Pages) List of Unclassifed Manufacturers – 32K x 8 AutoStore nvSRAM High Performance CMOS Nonvolatile Static RAM | |||
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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 ICC 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
A6
A7
A8
A9
A11
A12
A13
A14
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
EEPROM ARRAY
256 x 1024
STORE
STATIC RAM
ARRAY
256 x 1024
RECALL
STORE/
RECALL
CONTROL
VCC
POWER
CONTROL
COLUMN I/O
COLUMN DEC
SOFTWARE
DETECT
A0 A13
A0 A1 A2 A3 A4 A5 A10
G
E
W
PIN CONFIGURATIONS
A14 1
A12 2
A7 3
A6 4
A5 5
A4 6
A3 7
A2 8
A1 9
A 0 10
DQ 0 11
DQ 1 12
DQ 2 13
V SS 14
28 VCC
27 W
26 A13
25 A8
24 A9
23 A11
22 G
21 A10
20 E
19 DQ 7
18 DQ 6
17 DQ 5
16 DQ 4
15 DQ 3
28 - 300 PDIP
28 - 600 PDIP
28 - 350 SOIC
28 - 300 SOIC
PIN NAMES
A0 - A14
W
Address Inputs
Write Enable
DQ0 - DQ7
E
Data In/Out
Chip Enable
G
Output Enable
VCC
Power (+5V)
VSS
Ground
August 1998
5-35
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