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Mitsubishi - SYSTEM RESET IC WITH SWITCH FOR MEMORY BACK-UP

Numéro de référence M62021
Description SYSTEM RESET IC WITH SWITCH FOR MEMORY BACK-UP
Fabricant Mitsubishi 
Logo Mitsubishi 





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M62021 fiche technique
MITSUBISHI<Dig.Ana.INTERFACE>
M62021L,P,FP
SYSTEM RESET IC WITH SWITCH FOR MEMORY BACK-UP
DESCRIPTION
The M62021 is a system IC that controls the memory backup
function of SRAM and 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.
PIN CONFIGURATION (TOP VIEW)
8 CS
7 RES
6 GND
5 RES
4 Ct(DELAY CAPACITANCE)
3 VIN
2 VBAT
FEATURES
•Built-in switch for selection between main power supply and
backup power supply to RAM.
•Small difference between input and output voltage
(IOUT=80mA,VIN=5V)0.2V typ
•Detection voltage (power supply monitor voltage)4.40V±0.2V
•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
1 VOUT
Outline 8P5(L)
VOUT 1
VBAT 2
VIN 3
Ct(DELAY CAPACITANCE) 4
8 CS
7 RES
6 GND
5 RES
Outline 8P4(P)
8P2S-A(FP)
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
VIN 3
RES 7
RES 5
SW
R1
- Com
RESET
R2 + CIRCUIT
1.24V
DELAY
CIRCUIT
6
GND
MITSUBISHI
ELECTRIC
1 VOUT
D1
2 VBAT
8 CS
4 Ct
( 1 /9)

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