STK25C48 Datasheet, PDF (1/10 Pages) List of Unclassifed Manufacturers – 2K X 8 AUTOSTORE NVSRAM

STK25C48
2K x 8 AutoStore™ nvSRAM
QuantumTrap™ CMOS
Nonvolatile Static RAM
Obsolete - Not Recommend for new Designs
FEATURES
• Nonvolatile Storage without Battery Problems
• Directly Replaces 2K x 8 Static RAM, Battery-
Backed RAM or EEPROMs
• 25ns, 35ns and 45ns Access Times
• STORE to Nonvolatile Elements Initiated by
AutoStore™ on Power Down
• RECALL to SRAM Initiated by 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
• Commercial and Industrial Temperatures
• 24-Pin 600 PDIP Package
DESCRIPTION
The STK25C48 is a fast SRAM with a nonvolatile 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 Nonvolatile
Elements. Data transfers from the SRAM to the Nonvola-
tile Elements (the STORE operation) can take place auto-
matically on power down using charge stored in system
capacitance. Transfers from the Nonvolatile Elements to
the SRAM (the RECALL operation) take place automati-
cally on restoration of power. The nvSRAM can be used in
place of existing 2K x 8 SRAMs and also matches the
pinout of 2K x 8 battery-backed SRAMs, EPROMs and
EEPROMs, allowing direct substitution while enhancing
performance. No support circuitry is required for micro-
processor interfacing.
BLOCK DIAGRAM
QUANTUM TRAP
32 x 512
A₅
STORE
A₆
STATIC RAM
A₇
ARRAY
RECALL
A₈
32 x 512
A₉
STORE/
RECALL
CONTROL
V_CC
POWER
CONTROL
DQ₀
DQ₁
DQ₂
COLUMN I/O
COLUMN DEC
DQ₃
DQ₄
DQ₅
DQ₆
A₀ A₁ A₂ A₃ A₄ A₁₀
G
DQ₇
E
W
PIN CONFIGURATIONS
1
24
2
23
A₇ 3
22
A₆ 4
21
A₅ 5
20
A₄ 6
19
A₃ 7
18
A₂ ⁸
17
A₁ ⁹
16
A₀ ¹⁰
15
DQ₀ 11
14
DQ₁ 12
13
DQ
PIN NAMES
V_CC
A₈
A₉
W
G
A₁₀
E
DQ₇
DQ₆
DQ₅
DQ₄
DQ₃ 24 - 600 PDIP
A₀ - A₁₀
W
DQ₀ - DQ₇
E
G
V_CC
V_SS
Address Inputs
Write Enable
Data In/Out
Chip Enable
Output Enable
Power (+ 5V)
Ground
March 2006
1 Document Control # ML0005 rev 0.2