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M62021FP 参数 Datasheet PDF下载

M62021FP图片预览
型号: M62021FP
PDF下载: 下载PDF文件 查看货源
内容描述: 系统复位IC,带有开关,用于存储备份 [System Reset IC with Switch for Memory Backup]
分类和应用: 存储开关
文件页数/大小: 14 页 / 183 K
品牌: RENESAS [ RENESAS TECHNOLOGY CORP ]
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M62021L/P/FP
System Reset IC with Switch for Memory Backup
REJ03D0784-0200
Rev.2.00
Jun 15, 2007
Description
The M62021 is a system IC that controls the memory backup function of microcomputer (internal RAM).
The IC outputs reset signals (RES/RES) to a microcomputer at power-down and power failure. It also shifts the power
supply to RAM from main to backup, outputs a signal (CS) that invokes standby mode, and alters RAM to backup
circuit mode.
The M62021 contains, in a single chip, power supply monitor and RAM backup functions needed for a microcomputer
system, so that the IC makes it possible to construct a system easily and with fewer components compared with a
conventional case that uses individual ICs and discrete components.
Features
Built-in switch for selection between main power supply and backup power supply to RAM.
Small difference between input and output voltage (I
OUT
= 80 mA, V
IN
= 5 V) 0.2 V Typ
Detection voltage (power supply monitor voltage) 4.40 V
±
0.2 V
Chip select signal output (CS)
Two channels of reset outputs (RES/RES)
Power on reset circuit built-in
Delay time variable by an external capacitance connected to Ct pin
Facilitates to form backup function with a few number of components
Application
Power supply control systems for memory backup of microcomputer system and SRAM boards with built-in backup
function that require switching between external power supply and battery.
Block Diagram
SW
V
IN
3
R
1
R
2
+
1.24V
8
CS
Com
Reset
circuit
D
1
2 V
BAT
1 V
OUT
RES
7
RES 5
Delay
circuit
4 Ct
6
GND
REJ03D0784-0200 Rev.2.00 Jun 15, 2007
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