RNA51951A Datasheet, PDF (6/10 Pages) Renesas Technology Corp – Voltage Detecting, System Resetting IC Series

RNA51951A, B
Circuit Current vs. Ambient Temperature
(RNA51951B)
700
600
V_CC = 5 V
500
400
300
200
100
0
–40 –20 0 20 40 60 80 100
Ambient Temperature Ta (°C)
Example of Application Circuit
Reset Circuit of RNA51951
Power-
supply
R_L
Output
RNA51951x
GND
V_CC
Power-
supply
RESET
Logic circuit
GND
Preliminary
Figure 1 Reset Circuit of RNA51951
Notes: 1. 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  (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, 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.
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.
4. The logic circuit preferably should not have a pull-down resistor, but if one is present, add load resistor R_L to
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.
R03DS0003EJ0301 Rev.3.01
Apr 19, 2011
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