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參數(shù)資料
| 型號： | MM1134 |
| 廠商： | MITSUMI ELECTRIC |
| 英文描述： | IC for System Reset (battery backup) |
| 中文描述： | 集成電路系統(tǒng)復(fù)位（電池備份） |
| 文件頁數(shù)： | 1/8頁 |
| 文件大?。?/td> | 99K |
| 代理商： | MM1134 |
MITSUMI
IC for System Reset (battery backup) MM1134
IC for System Reset (battery backup)
Monolithic IC MM1134
Outline
This IC protects SRAM data by setting SRAM in backup mode (setting the CE pin of SRAM low and CE
high with CS signal) when supply voltage falls below a predetermined voltage (detection voltage 3.5V, 4.2V
typ.). Then, when supply voltage is getting lower, the main power supply is switched to a battery (switching
voltage 3.3V typ.) to enter backup mode with the battery. Meanwhile, when the power supply rises, first it
switches to the main power supply (switching voltage 3.3V typ.) from the battey backup mode, then switches
SRAM from backup mode to normal mode (by setting the CE pin of SRAM high and CE
damage can be reliably prevented by this signal processing.
pin
pin low). Data
Features
1. Power supply switching circuit (switching between the main power supply and a battery)
2. CS control for SRAM
Normal mode: Enables access to SRAM
Backup mode: Disables access to SRAM, low current consumption mode
3. With CS signal gate circuit
Characteristics
1. Battery back-up
1. Low IC current consumption (loss current)
2. Drop voltage inside IC (input/output voltage difference)
3. Reverse current (reverse leak current)
2. Normal operation
1. Drop voltage inside IC (input/output voltage difference)
2. Output voltage V
CC
=5V
3. Battery-V
CC
switching voltage
4. Detection voltage (CS, CS
0.3μA typ.
0.3V typ.
0.1μA max.
I
O
=100μA
I
O
=50μA
I
O
=50mA
0.2V typ.
4.8V typ.
3.3V typ.
, reset output)
A : 3.5V typ.
B : 4.2V typ.
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