RNA51955A, B

Preliminary

R03DS0004EJ0202 Rev.2.02

Page 7 of 11

Apr 19, 2011

Example of Application Circuit

Reset Circuit of RNA51955

RNA51955x

RESET

Logic circuit

Input

GND

GND

Power-

supply

Power-

supply

Output

Figure 1 Reset Circuit of RNA51955

are not necessary.

When the voltage is anything except 4.25 V, RNA51955, RNA51957, and RNA51958 are used. In this case,

the detecting supply voltage is 1.25

 (R

The detecting supply voltage can be set between 2 V and 15 V.

2. When the delay time is short, RNA51951 and RNA51955 are available. These ICs have a delay capacity

and the delay time is about 200

s.

If a longer delay time is necessary, RNA51953, RNA51957, and RNA51958 are used. In this case, the delay

time is about 0.34

 Cd (pF) s.

3. If the RNA5195xx 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, RNA51951, RNA51953, RNA51955,

and RNA51957 are used and when the terminal is of the high reset type, RNA51958 are used.

6. When a negative supply voltage is used, the supply voltage side of RNA5195xx and the GND side are

connected to negative supply voltage respectively.