Datasheet

TC1232
DS21370D-page 4 Preliminary  2002-2012 Microchip Technology Inc.
FIGURE 1-2: Push Button Reset and Watchdog Timer Reset Timing Waveforms.
AC CHARACTERISTICS (CONTINUED)
Electrical Specifications: Unless otherwise noted, T
A
= T
MIN
to T
MAX
; V
CC
= +4.0V to 5.5V.
Parameters Sym Min Typ Max Units Conditions
PB RST Pulse Width t
PB
20 — — ms Note 1
PB RST
Falling Edge Low to
Reset Active
t
PBD
14 20ms
PB RST Rising Edge High to
Reset Inactive
t
RST
250 610 1000 ms
ST Pulse Width t
ST
20 — — ns
ST
Time-out Period t
TD
62.5 150 250 ms TD Pin = 0V
250 600 1000 ms TD Pin = Open
500 1200 2000 ms TD Pin = V
CC
Note 1: PB RST must be held low for a minimum of 20 ms to ensure a reset.
RST
V
IL
t
PB
RST
t
PBD
V
IH
t
RST
PB RST
The debounced PB RST input ignores input pulses less
than 1 ms and is designed to recognize pulses of
20 ms or greater.
t
ST
ST
t
TD
RST (when t
TD
 t
TD
(min))
“H”
RST
(when t
TD
(min)  t
TD
 t
TD
(max))
(when t
TD
 t
TD
(max))
RST
RST (when t
TD
 t
TD
(min))
“L”
RST
(when t
TD
(min)  t
TD
 t
TD
(max))
(when t
TD
 t
TD
(max))
RST