M51955A Просмотр технического описания (PDF) - Renesas Electronics

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M51955A

Voltage Detecting, System Resetting IC Series

Renesas Electronics 

M51955A,B/M51956A,B

Example of Application Circuit

Reset Circuit of M5195xx Series

R1

Input

R2

Power-

supply

RL

M51955x

Output

M51956x

GND

VCC

Power-

supply

RESET (RESET)

Logic circuit

GND

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,

R1 and R2 are not necessary.

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 × (R1 +R2)/R2 (V) approximately. The detecting supply voltage can be

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.

4. The logic circuit preferably should not have a pull-down resistor, but if one is present, add load resistor RL to

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.

REJ03D0777-0200 Rev.2.00 Aug 20, 2007

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