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

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

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

+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

7

RES

5

RES

2

4

Ct

8

CS

–

+

1.24V

+5V

(Main power supply)

Com

SW

M62021

Reset

circuit

Delay

circuit

6

GND

Battery

3V

+

+

+

Note)1

Notes: *

1.

2.

When it is necessary to charge the back-up power supply such as using the large-capacity capacitor,

+

Note)2

MCU

or

CPU

CMOS

RAM

Figure 2 Application Example