M62023L/P/FP
System Reset IC with Switch for 3V Memory Back-up
REJ03D0528-0200
Rev.2.00
Jun 15, 2007
General Description
The M62023L/P/FP is a system reset IC that controls the memory backup function of an SRAM and an embedded RAM
of a microcontroller.
The IC outputs reset signals (RES/RES) to a microcontroller at power-down and power failure. It also shifts the power
supply to RAMs from main to backup, outputs a signal (CS) that invokes standby mode, and alters RAMs to backup
circuit mode.
Features
•
•
•
•
•
•
Built-in switch for selection between main power supply and backup power supply to RAMs
Small difference between input and output voltages (I
OUT
= 80mA, V
IN
=3V): 0.15V typ.
Detection voltage (power supply monitor voltage): 2.57V typ.
Chip select signal output (CS)
Two channels of reset outputs (RES/RES)
Power on reset circuit.
Application
Power supply control systems for memory of microcontroller systems in electronic equipment such as OA equipment,
industrial equipment, and home-use electronic appliances and SRAM boards with built-in backup function that require
switching between external power supply and battery.
Block Diagram
SW
V
IN
3
R1
Com
Reset Circuit
R2
1.24V
8
CS
D1
2
V
BAT
1
V
OUT
RES
RES
7
5
Delay Circuit
4
C
t
6
GND
REJ03D0528-0200 Rev.2.00 Jun 15, 2007
Page 1 of 12
RENESAS [ RENESAS TECHNOLOGY CORP ]
