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STK11C68-P20I Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers

Part # STK11C68-P20I
Description  8K x 8 nvSRAM QuantumTrap??CMOS Nonvolatile Static RAM
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Manufacturer  ETC [List of Unclassifed Manufacturers]
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STK11C68-P20I Datasheet(HTML) 1 Page - List of Unclassifed Manufacturers

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June 1999
4-21
STK11C68
8K x 8 nvSRAM
QuantumTrap™ CMOS
Nonvolatile Static RAM
FEATURES
• 20ns, 25ns, 35ns and 45ns Access Times
• STORE to EEPROM Initiated by Software
• RECALL to SRAM Initiated by Software or
Power Restore
• 10mA Typical 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 Temperatures
• 28-Pin DIP and SOIC Packages
DESCRIPTION
The Simtek STK11C68 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), or from EEPROM to
SRAM
(the RECALL operation), take place using a
software sequence. Transfers from the EEPROM to
the SRAM (the RECALL operation) also take place
automatically on restoration of power.
The STK11C68 is pin-compatible with industry-
standard SRAMs. MIL-STD-883 device is also
available (STK11C68-M).
BLOCK DIAGRAM
COLUMN I/O
COLUMN DEC
STATIC RAM
ARRAY
128 x 512
EEPROM ARRAY
128 x 512
STORE/
RECALL
CONTROL
STORE
RECALL
A5
A6
A9
A11
A12
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
SOFTWARE
DETECT
A0 -A12
G
E
W
A8
A7
A10
A3
A2
A0 A1
A4
PIN CONFIGURATIONS
NC
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
VSS
VCC
NC
A8
A9
A11
G
W
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
A10
E
DQ7
DQ6
DQ5
DQ4
DQ3
28 - 300 PDIP
28 - 300 CDIP
28 - 350 SOIC
PIN NAMES
A0 - A12
Address Inputs
W
Write Enable
DQ0 - DQ7
Data In/Out
E
Chip Enable
G
Output Enable
VCC
Power (+ 5V)
VSS
Ground


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