ncp1232dr2 ON Semiconductor, ncp1232dr2 Datasheet - Page 5

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

CONDITION
TD PIN = 0 V
TD PIN = OPEN
TD PIN = V CC
guaranteed to recognized pulses of 20 msec or greater
NOTE: t TD is the maximum elapsed time between ST high–to–low
Figure 3. Push–button Reset. The debounced PB RST
ST
input ignores input pulses less than 1 msec and is
PB RST
RST
RST
transistions (ST is activated by falling edges only) which will
keep the watchdog timer from forcing the reset outputs active
for a time of t RST . t TD is a function of the voltage at the TD pin,
as tabulated below.
t ST
V IL
t PBD
PUSH–BUTTON RESET
Figure 4. Strobe Input
http://onsemi.com
t PB
62.5 msec
250 msec
500 msec
MIN
t TD
NCP1232
5
1200 msec
150 msec
600 msec
V IH
t RST
TYP
t
TD
1000 msec
2000 msec
250 msec
MAX