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STK20C04 Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers

Part No. STK20C04
Description  CMOS nvSRAM High Performance 512 x 8 Nonvolatile Static RAM
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STK20C04 Datasheet(HTML) 1 Page - List of Unclassifed Manufacturers

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STK20C04
2-39
DESCRIPTION
The Simtek STK20C04 is a fast static RAM (30, 35,
45ns), with a nonvolatile electrically-erasable PROM
(EEPROM) 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 may easily be transferred
from the SRAM to the EEPROM (STORE), or from the
EEPROM
to the SRAM (RECALL) using the NE pin. It
combines the high performance and ease of use of a
fast SRAM with nonvolatile data integrity.
The STK20C04 features the industry standard pinout
for nonvolatile RAMs in a 28-pin 600 mil plastic DIP.
PIN NAMES
A0 - A8
Address Inputs
W
Write Enable
DQ0 - DQ7
Data In/Out
E
Chip Enable
G
Output Enable
NE
Nonvolatile Enable
VCC
Power (+5V)
VSS
Ground
STK20C04
CMOS nvSRAM
High Performance
512 x 8 Nonvolatile Static RAM
FEATURES
• 30, 35 and 45ns Access Times
• 15, 20 and 25ns Output Enable Access
• Unlimited Read and Write to SRAM
• Hardware STORE Initiation
• Automatic STORE Timing
• 105 STORE cycles to EEPROM
• 10 year data retention in EEPROM
• Automatic RECALL on Power Up
• Hardware RECALL Initiation
• Unlimited RECALL cycles from EEPROM
• Single 5V
±10% Operation
• Commercial and Industrial Temperatures
• Available in 600 mil PDIP package
28
27
26
25
24
23
22
21
20
19
18
17
16
15
DQ
DQ
DQ
DQ
DQ
V
W
NC
A
NC
NC
G
NC
E
8
7
6
5
4
3
CC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
NE
NC
A
A
A
A
A
A
A
A
DQ
DQ
DO
VSS
7
6
5
4
3
2
1
0
0
1
2
LOGIC BLOCK DIAGRAM
PIN CONFIGURATIONS
28 - 600 PDIP
A
A
A
A
A
A
3
4
5
6
7
8
EEPROM ARRAY
64 X 64
STORE
RECALL
STATIC RAM
ARRAY
64 X 64
STORE/
RECALL
CONTROL
AA
A
01
2
DQ
DQ
DQ
DQ
DQ
DQ
DQ
DQ
0
1
2
3
4
5
6
7
G
NE
E
W
COLUMN I/O
COLUMN DECODER


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