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參數(shù)資料
| 型號： | DS1249AB |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | DRAM |
| 英文描述： | 2048K Nonvolatile SRAM(2048K 非易失性靜態(tài)RAM) |
| 中文描述： | 256K X 8 NON-VOLATILE SRAM MODULE, 70 ns, PDIP32 |
| 文件頁數(shù)： | 1/9頁 |
| 文件大小： | 68K |
| 代理商： | DS1249AB |
DS1249Y/AB
2048K Nonvolatile SRAM
DS1249Y/AB
021998 1/9
FEATURES
10 years minimum data retention in the absence of
external power
Data is automatically protected during power loss
Unlimited write cycles
Low–power CMOS operation
Read and write access times as fast as 70 ns
Lithium energy source is electrically disconnected to
retain freshness until power is applied for the first time
Full
±
10% V
CC
operating range (DS1249Y)
Optional
±
5% V
CC
operating range (DS1249AB)
Optional industrial temperature range of –40
°
C to
+85
°
C, designated IND
JEDEC standard 32–pin DIP package
PIN ASSIGNMENT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
V
CC
A15
A17
WE
A13
A8
A9
A11
OE
A10
CE
DQ7
DQ6
DQ5
DQ4
DQ3
NC
A16
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
GND
32–PIN ENCAPSULATED PACKAGE
740 MIL EXTENDED
PIN DESCRIPTION
A0 – A17
DQ0 – DQ7
CE
WE
OE
V
CC
GND
NC
– Address Inputs
– Data In/Data Out
– Chip Enable
– Write Enable
– Output Enable
– Power (+5V)
– Ground
– No Connect
DESCRIPTION
The DS1249 2048K Nonvolatile SRAMs are
2,097,152–bit, fully static, nonvolatile SRAMs orga-
nized as 262,144 words by 8 bits. Each NV SRAM has a
self–contained lithium energy source and control cir-
cuitry which constantly monitors V
CC
for an out–of–tol-
erance condition. When such a condition occurs, the
lithium energy source is automatically switched on and
write protection is unconditionally enabled to prevent
data corruption. There is no limit on the number of write
cycles which can be executed and no additional support
circuitry is required for microprocessor interfacing.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1249Y | 2048K Nonvolatile SRAM(2048K 非易失性靜態(tài)RAM) |
| DS1267 | Dual Digital Potentiometer Chip(雙路數(shù)字電位器芯片) |
| DS1280 | 3-Wire to Bytewide Converter Chip(3線至字節(jié)寬度（8位）轉(zhuǎn)換芯片) |
| DS1284 | Watchdog Timekeeper Chip(看門狗計(jì)時器芯片) |
| DS1286 | Watchdog Timekeeper(看門狗計(jì)時器芯片) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1249AB100 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:2048k Nonvolatile SRAM |
| DS1249AB-100 | 功能描述:NVRAM 2048K NV SRAM RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)總線寬度:8 bit 存儲容量:1024 Kbit 組織:128 K x 8 接口類型:Parallel 訪問時間:70 ns 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 工作電流:85 mA 最大工作溫度:+ 70 C 最小工作溫度:0 C 封裝 / 箱體:EDIP 封裝:Tube |
| DS1249AB-100# | 功能描述:NVRAM 2048K NV SRAM RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)總線寬度:8 bit 存儲容量:1024 Kbit 組織:128 K x 8 接口類型:Parallel 訪問時間:70 ns 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 工作電流:85 mA 最大工作溫度:+ 70 C 最小工作溫度:0 C 封裝 / 箱體:EDIP 封裝:Tube |
| DS1249AB-100-IND | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:NVRAM (Battery Based) |
| DS1249AB70 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:2048k Nonvolatile SRAM |
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