ncp1232dr2 ON Semiconductor, ncp1232dr2 Datasheet - Page 2

• Manufacturer Part Number: ncp1232dr2
• Description: Microprocessor Monitor
• Manufacturer: ON Semiconductor

(8–Pin SOIC)
Pin No.
1
2
3
4
5
6
7
8
PB RST
VD CC
TOL
TD
Symbol
PB RST
GND
V CC
TOL
RST
RST
TD
ST
TOLERANCE
WATCHDOG
DEBOUNCE
TIMEBASE
SELECT
SELECT
5%/10%
Push–button Reset Input. A debounced active–low input that ignores pulses less than 1 msec in
duration and is guaranteed to recognize inputs of 20 msec or greater.
Time Delay Set. The watchdog time–out select input (t TD = 150 msec for
TD = 0 V, t TD = 600 msec for TD = open, t TD = 1.2 sec for TD = V CC .)
Tolerance Input. Connect to GND for 5% tolerance or to V CC for 10% tolerance.
Ground.
Reset Output (Active High) – goes active:
1. If V CC falls below the selected reset voltage threshold
2. If PB RST is forced low
3. If ST is not strobed within the minimum time–out period
4. During power–up
Reset Output (Active Low, Open Drain) – see RST.
Strobe Input. Input for watchdog timer.
The +5 V Power Supply Input.
REF
FUNCTIONAL BLOCK DIAGRAM
PIN DESCRIPTION
http://onsemi.com
NCP1232
GND
2
GENERATOR
NCP1232
RESET
Description
WATCHDOG
TIMER
RST
RST
ST