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M62021 データシート(PDF) 1 Page - Mitsubishi Electric Semiconductor

部品番号 M62021
部品情報  SYSTEM RESET IC WITH SWITCH FOR MEMORY BACK-UP
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メーカー  MITSUBISHI [Mitsubishi Electric Semiconductor]
ホームページ  http://www.mitsubishichips.com
Logo MITSUBISHI - Mitsubishi Electric Semiconductor

M62021 データシート(HTML) 1 Page - Mitsubishi Electric Semiconductor

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ELECTRIC
MITSUBISHI
M62021L,P,FP
MITSUBISHI<Dig.Ana.INTERFACE>
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.
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
BLOCK DIAGRAM
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.
1
PIN CONFIGURATION (TOP VIEW)
8
5
6
7
1
4
3
2
Outline 8P5(L)
Outline 8P4(P)
8P2S-A(FP)
+
-
3
8
4
6
GND
VIN
RES
GND
8
5
4
6
7
3
2
1
RES
VBAT
VOUT
Ct(DELAY CAPACITANCE)
CS
VOUT
VBAT
VIN
Ct(DELAY CAPACITANCE)
RES
GND
RES
CS
RESET
CIRCUIT
DELAY
CIRCUIT
7
5
1
2
SW
Ct
CS
VBAT
VOUT
VIN
RES
RES
Com
1.24V
R1
R2
D1


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