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參數(shù)資料
| 型號： | STK22C48-W25 |
| 英文描述： | NVRAM (EEPROM Based) |
| 中文描述： | NVRAM中（EEPROM的基礎(chǔ)） |
| 文件頁數(shù)： | 1/10頁 |
| 文件大?。?/td> | 110K |
| 代理商： | STK22C48-W25 |
July 1999
3-21
PIN CONFIGURATIONS
V
CAP
NC
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
DQ
0
DQ
1
DQ
2
V
SS
V
CCX
W
HSB
A
8
A
9
NC
G
A
10
E
DQ
7
DQ
6
DQ
5
DQ
4
DQ
3
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
28 - 300 PDIP
28 - 600 PDIP
28 - 300 SOIC
28 - 350 SOIC
PIN NAMES
A
0
- A
10
DQ
0
-DQ
7
E
W
G
HSB
V
CCX
V
CAP
V
SS
Address Inputs
Data In/Out
Chip Enable
Write Enable
Output Enable
Hardware Store Busy (I/O)
Power (+ 5V)
Capacitor
Ground
STK22C48
2K x 8
AutoStore
nvSRAM
QuantumTrap
CMOS
Nonvolatile Static RAM
FEATURES
20ns, 25ns, 35ns and 45ns Access Times
“
Hands-off
”
Automatic
STORE
with External
68
μ
F Capacitor on Power Down
STORE
to EEPROM Initiated by Hardware or
AutoStore
on Power Down
Automatic
RECALL
on
Power Up
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 in EEPROM
Single 5V + 10% Operation
Not Sensitive to Power On/Off Ramp Rates
No Data Loss from Undershoot
Commercial and Industrial Temperatures
28-Pin DIP and SOIC Packages
DESCRIPTION
The Simtek STK22C48 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
EEPROM
. Data transfers from the
SRAM
to the
EEPROM
(the
STORE
operation) can take place
automatically on power down. A 68
μ
F or larger
capacitor tied from V
CAP
to ground guarantees the
STORE
operation, regardless of power-down slew
rate or loss of power from “hot swapping”. Transfers
from the
EEPROM
to the
SRAM
(the
RECALL
opera-
tion) take place automatically on restoration of
power. A hardware
STORE
may be initiated with the
HSB pin.
BLOCK DIAGRAM
COLUMN I/O
COLUMN DEC
STATIC RAM
ARRAY
32 x 512
R
I
EEPROM ARRAY
32 x 512
STORE/
RECALL
CONTROL
STORE
RECALL
POWER
CONTROL
A
5
A
6
A
7
A
9
DQ
0
DQ
1
DQ
2
DQ
3
DQ
4
DQ
5
DQ
6
DQ
7
G
E
W
A
8
A
10
A
3
A
2
A
0
A
1
A
4
V
CCX
V
CAP
HSB
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| STK22C48-W25I | DIODE TVS 300V 400W UNI 5% SMA |
| STK22C48-W35 | DIODE TVS 30V 400W BIDIR 5% SMA |
| STK22C48-W35I | DIODE TVS 350V 400W UNI 5% SMA |
| STK22C48-W45 | DIODE TVS 36V 400W UNI 5% SMA |
| STK22C48-W45I | DIODE TVS 400V 400W UNI 5% SMA |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| STK22C48W25I | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:2K x 8 AutoStore? nvSRAM QuantumTrap? CMOS Nonvolatile Static RAM |
| STK22C48-W25I | 制造商:SIMTEK 制造商全稱:Simtek Corporation 功能描述:2K x 8 AutoStore⑩ nvSRAM QuantumTrap⑩ CMOS Nonvolatile Static RAM |
| STK22C48W35 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:2K x 8 AutoStore⑩ nvSRAM QuantumTrap⑩ CMOS Nonvolatile Static RAM |
| STK22C48-W35 | 制造商:SIMTEK 制造商全稱:Simtek Corporation 功能描述:2K x 8 AutoStore⑩ nvSRAM QuantumTrap⑩ CMOS Nonvolatile Static RAM |
| STK22C48W35I | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:2K x 8 AutoStore⑩ nvSRAM QuantumTrap⑩ CMOS Nonvolatile Static RAM |
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