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參數(shù)資料
| 型號(hào)： | bq2201 |
| 廠商： | Benchmark Technology Group |
| 英文描述： | SRAM Nonvolatile Controller Unit(靜態(tài)RAM非易失性控制器單元) |
| 中文描述： | 非易失SRAM的控制器單元（靜態(tài)RAM的非易失性控制器單元） |
| 文件頁(yè)數(shù)： | 1/12頁(yè) |
| 文件大小： | 117K |
| 代理商： | BQ2201 |
Features
Power monitoring and switching
for 3-volt battery-backup applica-
tions
Write-protect control
3-volt primary cell inputs
Less than 10ns chip-enable
propagation delay
5% or 10% supply operation
General Description
The CMOS bq2201 SRAM Nonvolatile
Controller Unit provides all necessary
functions for converting a standard
CMOS SRAM into nonvolatile
read/writememory.
A precision comparator monitors the
5V V
CC
input for an out-of-tolerance
condition. When out of tolerance is
detected, a conditioned chip-enable
output is forced inactive to write-
protect any standard CMOS SRAM.
During a power failure, the external
SRAM is switched from the V
CC
supply to one of two 3V backup sup-
plies. On a subsequent power-up, the
SRAM is write-protected until a
power-valid condition exists.
The bq2201 is footprint- and timing-
compatible with industry stan-
dards with the added benefit of a
chip-enable propagation delay of
less than 10ns.
1
SRAM Nonvolatile Controller Unit
bq2201
Oct. 1998 D
Pin Names
V
OUT
Supply output
BC
1
—BC
2
3-volt primary backup cell inputs
THS
Threshold select input
CE
chip-enable active low input
CE
CON
Conditioned chip-enable output
V
CC
+5-volt supply input
V
SS
Ground
NC
No Connect
Functional Description
Pin Connections
An external CMOS static RAM can be battery-backed
using the V
OUT
and the conditioned chip-enable output
pin from the bq2201. As V
CC
slews down during a power
failure, the conditioned chip-enable output CE
CON
is
forced inactive independent of the chip-enable input CE.
This activity unconditionally write-protects external
SRAM as V
CC
falls to an out-of-tolerance threshold V
PFD
.
V
PFD
is selected by the threshold select input pin,THS.
If THS is tied to V
SS
, power-fail detection occurs at 4.62V
typical for 5% supply operation. If THS is tied to V
CC
,
power-fail detection occurs at 4.37V typical for 10% sup-
ply operation. The THS pin must be tied to V
SS
or V
CC
for
proper operation.
If a memory access is in process during power-fail detec-
tion, that memory cycle continues to completion before the
memory is write-protected. If the memory cycle is not ter-
minated within time t
WPT
, the CE
CON
output is uncondi-
tionally driven high,write-protecting the memory.
1
PN220101.eps
8-Pin Narrow DIP or SOIC
2
3
4
8
7
6
5
VCC
BC1
CECON
CE
VOUT
BC2
THS
VSS
1
PN2201E.eps
16-Pin SOIC
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
NC
V
CC
NC
BC
1
NC
CE
CON
NC
CE
NC
V
OUT
NC
BC
2
NC
THS
NC
VSS
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BQ2201PN | 功能描述:存儲(chǔ)器控制器 SRAM Nonvolatile Controller IC RoHS:否 制造商:Maxim Integrated |
| BQ2201PNE4 | 功能描述:IC SRAM NONVOLATILE CNTRLR 8DIP RoHS:是 類別:集成電路 (IC) >> 存儲(chǔ)器 - 控制器 系列:- 標(biāo)準(zhǔn)包裝:45 系列:- 控制器類型:靜態(tài) RAM（SRAM） 電源電壓:4.5 V ~ 5.5 V 工作溫度:0°C ~ 70°C 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC W 包裝:管件 |
| BQ2201PNG4 | 功能描述:IC SRAM NONVOLATILE CNTRLR 8DIP 制造商:texas instruments 系列:- 包裝:管件 零件狀態(tài):停產(chǎn) 控制器類型:非易失性 SRAM 電壓 - 電源:4.5 V ~ 5.5 V 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商器件封裝:8-PDIP 基本零件編號(hào):BQ2201 標(biāo)準(zhǔn)包裝:50 |
| BQ2201PNN | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SRAM Nonvolatile Controller Unit |
| BQ2201PN-N | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Nonvolatile Controller |
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