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STK12C68-IM Datasheet, PDF (1/10 Pages) List of Unclassifed Manufacturers – CMOS nvSRAM 8K x 8 AutoStore Nonvolatile Static RAM Industrial Temperature/Military Screen
STK12C68-IM
STK12C68-IM
CMOS nvSRAM
8K x 8 AutoStore™
Nonvolatile Static RAM
Industrial Temperature/Military Screen
FEATURES
DESCRIPTION
• Industrial Temperature with Military Screening
• 25, 35 and 45ns Access Times
• 15 mA ICC at 200ns Access Speed
• Automatic STORE to EEPROM on Power Down
• Hardware or Software initiated STORE to
EEPROM
• Automatic STORE Timing
• 100,000 STORE cycles to EEPROM
• 10 year data retention in EEPROM
• Automatic RECALL on Power Up
• Software initiated RECALL from EEPROM
• Unlimited RECALL cycles from EEPROM
• Single 5V±10% Operation
• Commercial and Industrial Temperatures
• Available in multiple standard packages
LOGIC BLOCK DIAGRAM
The Simtek STK12C68-IM is a fast static RAM (25, 35
and 45ns), with a nonvolatile EEPROM element incor-
porated 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) take place automatically upon power down
using charge stored in an external 100 µF capacitor.
Transfers from the EEPROM to the SRAM (the RECALL
operation) take place automatically on power up. Soft-
ware sequences may also be used to initiate both
STORE and RECALL operations. A STORE can also be
initiated via a single pin.
The STK12C68-IM is available in the following
packages: a 28-pin 300 mil ceramic DIP and a 28-pad
LCC. MIL-STD-883 and Standard Military Drawing
(SMD 5962-94599) devices are also available.
PIN CONFIGURATIONS
A3
A4
A
5
A6
A7
A8
A9
A12
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
EEPROM ARRAY
256 x 256
STATIC RAM
ARRAY
256 x 256
STORE
RECALL
COLUMN I/O
COLUMN DECODER
A 0 A 1 A 2 A10 A11
A 0 A 12
STORE/
RECALL
CONTROL
HSB
G
E
W
41
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
32
28 27
4
1
26
5
25
6
24
7
23
8 TOP VIEW 22
9
21
10
20
11
19
12
18
13 14 15 16 17
HSB
A8
A9
A11
G
A10
E
DQ7
DQ 6
VCAP 1
A 12 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
VSS 14
28 VCCX
27 W
26 HSB
25 A 8
24 A 9
23 A 11
22 G
21 A 10
20 E
19 DQ 7
18 DQ 6
17 DQ 5
16 DQ 4
15 DQ 3
28 - LCC
28 - 300 CDIP
PIN NAMES
A0 - A12
W
Address Inputs
Write Enable
DQ0 - DQ7
E
Data In/Out
Chip Enable
G
Output Enable
VCCX
VSS
VCAP
HSB
Power (+5V)
Ground
Capacitor
Hardware Store/Busy
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