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STK16C68-WF25 Fiches technique(PDF) 1 Page - Simtek Corporation

No de pièce STK16C68-WF25
Description  8K x 8 AutoStorePlus??nvSRAM QuantumTrap??CMOS Nonvolatile Static RAM
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Fabricant  SIMTEK [Simtek Corporation]
Site Internet  http://www.simtek.com
Logo SIMTEK - Simtek Corporation

STK16C68-WF25 Fiches technique(HTML) 1 Page - Simtek Corporation

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March 2006
1
Document Control # ML0010 rev 0.2
STK16C68
8K x 8 AutoStorePlus™ nvSRAM
QuantumTrap™ CMOS
Nonvolatile Static RAM
Obsolete - Not Recommend for new Designs
FEATURES
• Internal Capacitor Guarantees AutoStore™
Regardless of Power-Down Slew Rate
• Nonvolatile Storage without Battery Problems
• Directly Replaces 8K x 8 Static RAM, Battery-
Backed RAM or EEPROM
• 25ns, 35ns and 45ns Access Times
• STORE to Nonvolatile Elements Initiated by
Software or AutoStorePlus™ on Power Down
• 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 Nonvolatile Ele-
ments
• 100-Year Data Retention over Full Industrial
Temperature Range
• No Data Loss from Undershoot
• Commercial and Industrial Temperatures
• 28-Pin 600 mil PDIP Package
DESCRIPTION
The STK16C68 is a fast SRAM with a nonvolatile ele-
ment incorporated in each static memory cell. The
SRAM
can be read and written an unlimited number of
times, while independent nonvolatile data resides in
Nonvolatile Elements. Data transfers from the SRAM to
the Nonvolatile Elements (the STORE operation) can
take place automatically on power down. An internal
capacitor guarantees the STORE operation regardless
of power-down slew rate. Transfers from the Nonvola-
tile Elements to the SRAM (the RECALL operation) take
place automatically on restoration of power. Initiation
of STORE and RECALL cycles can also be controlled by
entering control sequences on the SRAM inputs. The
STK16C68 is pin-compatible with 8k x 8 SRAMs and
battery-backed SRAMs, allowing direct substitution
while enhancing performance. The STK12C68, which
uses an external capacitor, and the STK15C68, which
uses charge stored in system capacitance, are alter-
natives for systems needing AutoStore™ operation.
BLOCK DIAGRAM
COLUMN I/O
COLUMN DEC
STATIC RAM
ARRAY
128 x 512
QUANTUM TRAP
128 x 512
STORE/
RECALL
CONTROL
STORE
RECALL
POWER
CONTROL
A5
A6
A9
A11
A12
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
SOFTWARE
DETECT
VCC
A0 - A12
G
E
W
A8
A7
A10
A3
A2
A0 A1
A4
INTERNAL
CAPACITOR
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
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 - 600 PDIP


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