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STK25C48-W35I 数据表(PDF) 1 Page - List of Unclassifed Manufacturers

部件名 STK25C48-W35I
功能描述  2K X 8 AUTOSTORE NVSRAM
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制造商  ETC [List of Unclassifed Manufacturers]
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标志 ETC - List of Unclassifed Manufacturers

STK25C48-W35I 数据表(HTML) 1 Page - List of Unclassifed Manufacturers

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July 1999
3-31
STK25C48
2K x 8 AutoStore™ nvSRAM
QuantumTrap™ CMOS
Nonvolatile Static RAM
FEATURES
• Nonvolatile Storage without Battery Problems
• Directly Replaces 2K x 8 Static RAM, Battery-
Backed RAM or EEPROM
• 20ns, 25ns, 35ns and 45ns Access Times
• STORE to EEPROM Initiated by AutoStore™
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 EEPROM
• 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
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 the EEPROM. Data transfers from the SRAM to
the EEPROM (the STORE operation) can take place auto-
matically on power down using charge stored in system
capacitance. Transfers from the EEPROM to the SRAM
(the RECALL operation) take place automatically on res-
toration 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.
There is no limit on the number of read or write cycles that
can be executed, and no support circuitry is required for
microprocessor interfacing.
BLOCK DIAGRAM
COLUMN I/O
COLUMN DEC
STATIC RAM
ARRAY
32 x 512
EEPROM ARRAY
32 x 512
STORE/
RECALL
CONTROL
STORE
RECALL
POWER
CONTROL
A5
A6
A9
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
VCC
G
E
W
A8
A7
A10
A3
A2
A0 A1
A4
PIN CONFIGURATIONS
VCC
A9
W
G
A10
E
A8
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
DQ7
DQ6
DQ5
DQ4
DQ3
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
VSS
A6
24 - 600 PDIP
PIN NAMES
A0 - A10
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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