M51957A,B/M51958A,B

REJ03D0778-0200 Rev.2.00 Aug 20, 2007

Page 6 of 13

Example of Application Circuit

Reset Circuit of M5195xx Series

M51957x

M51958x

RESET (

RESET)

Logic circuit

Input

GND

GND

Delay capacitor

Cd

Power-

supply

Power-

supply

Output

Figure 1 Reset Circuit of M5195xx Series

Notes: 1. When the detecting supply voltage is 4.25 V, M51951, M51952, M51953 and M51954 are used. In this case,

When the voltage is anything except 4.25 V, M51955, M51956, M51957 and M51958 are used. In this case,

the detecting supply voltage is 1.25

× (R

set between 2 V and 15 V.

2. When the delay time is short, M51951, M51952, M51955 and M51956 are available. These ICs have a

delay capacity and the delay time is about 200

µs.

If a longer delay time is necessary, M51953, M51954, M51957 and M51958 are used. In this case, the delay

time is about 0.34

× Cd (pF) µs.

3. If the M5195xx and the logic circuit share a common power source, type A (built-in load type) can be used

whether a pull-up resistor is included in the logic circuit or not.

overcome the pull-down resistor.

5. When the reset terminal in the logic circuit is of the low reset type, M51951, M51953, M51955 and M51957

are used and when the terminal is of the high reset type, M51952, M51954, M51956 and M51958 are used.

6. When a negative supply voltage is used, the supply voltage side of M5195xx and the GND side are

connected to negative supply voltage respectively.

Case of Using Reset Signal except Supply Voltage in the M5195xx Series

(a) Reset at ON

(b) Reset at transistor ON

Input

RESET (

RESET)

Logic circuit

Input

GND

Delay capacitor

GND

Cd

RESET (

RESET)

Logic circuit

GND

Delay capacitor

GND

Cd

Out

put

Out

put

M5195xx

(External delay

capacitor type)

M5195xx

(External delay

capacitor type)

Control

signal

Power-

supply

Power-

supply

Power-

supply

Power-

supply

Figure 2 Case of Using Reset Signal except Supply Voltage in the M5195xx Series