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| LP3470 Datasheet, PDF (5/8 Pages) National Semiconductor (TI) – Tiny Power On Reset Circuit | |||
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Typical Operating Characteristics TA = +25ËC, unless otherwise specified. (Continued)
VHYST vs VRTH
VHYST vs Temperature
10001614
10001609
Pin Description
Pin
Name
Function
1
SRT
Set Reset Time-out Input. Connect a capacitor between this input and ground to select the Reset
Time-out period (tRP). tRP = 2000 x C1 (C1 in µF and tRP in ms). If no capacitor is connected,
leave this pin floating.
2
GND
Ground pin.
3
VCC1
Always connect to pin VCC (Pin 4).
4
VCC
Supply voltage, and reset threshold monitor input.
5
Reset
Open-Drain, Active-Low reset output. Connect to an external pull-up resistor. Reset changes from
high to low whenever the monitored voltage (VCC) drops below the reset threshold voltage (VRTH).
Once VCC exceeds VRTH, Reset remains low for the reset timeout period (tRP) and then goes high.
Functional Block Diagram
10001603
5
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