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M62021L Datasheet(PDF) 5 Page - Renesas Technology Corp

Part # M62021L
Description  System Reset IC with Switch for Memory Backup
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

M62021L Datasheet(HTML) 5 Page - Renesas Technology Corp

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M62021L/P/FP
REJ03D0784-0200 Rev.2.00 Jun 15, 2007
Page 5 of 13
Pin Description
Pin No.
Pin Name
Symbol
Function
1
Power supply output
VOUT
VIN and VBAT are controlled by means of an internal switch and output
through VOUT.
The pin is capable of outputting up to 100 mA. Use it as VDD of CMOS
RAM and the like.
2
Backup power supply
input
VBAT
Backup power supply is connected to this pin.
If a lithium battery is used, insert a resistor in series for safety purposes.
3
Power supply input
VIN
+5 V input pin. Connect to a logic power supply.
4
Delay capacitor
connection pin
Ct
A delay capacitor is connected to this pin. By connecting a capacitor, it is
possible to delay each output.
5
Positive reset output
RES
Connect to the positive reset input of a microcomputer. The pin is capable
of flowing 1 mA sink current.
6
Ground
GND
Reference for all signals.
7
Negative reset output
RES
Connect to the negative reset input of a microcomputer. The pin is
capable of flowing 1 mA sink current.
8
Chip select output
CS
Connect to the chip select of RAM. The CS output is at low level in normal
state thereby letting RAM be active. Under failure or backup condition, the
CS output is set to high level, then RAM enters standby state disabling
read/write function. The pin is capable of flowing a 1 mA sink current.
Application Example
3
1
R1
VIN
7
RES
5
RES
VOUT
2
VBAT
COUT
4
Ct
8
CS
R2
D1
+
1.24V
+5V
(Main power supply)
Com
SW
M62021
Reset
circuit
Delay
circuit
6
GND
Battery
3V
+
+
CIN
+
C1
Note)1
Notes: *
1.
2.
Capacitance to be connected: CIN: 10µF, COUT: 4.7µF, Ct: 4.7µF
If connecting a zener diode, select one of VZ ≈ 2V to 3V. (IZ = 0.1mA)
When it is necessary to charge the back-up power supply such as using the large-capacity capacitor,
connect it to VIN via a diode and a protection resistor.
+
Note)2
VDD
VDD
MCU
or
CPU
CMOS
RAM
Figure 2 Application Example


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