TC1232 Datasheet, PDF (4/20 Pages) TelCom Semiconductor, Inc – MICROPROCESSOR MONITOR

TC1232
t_PB
ST
t_ST
t_TD
PB RST
t_PBD
V_IL
RST
RST
V_IH
t_RST
RST (when t_TD ≤ t_TD (min))
“H”
RST
(when t_TD(min) ≤ t_TD ≤ t_TD(max))
RST
(when t_TD ≥ t_TD(max))
The debounced PB RST input ignores input pulses less
than 1 ms and is designed to recognize pulses of
20 ms or greater.
RST (when t_TD ≤ t_TD(min))
“L”
RST
(when t_TD(min) ≤ t_TD ≤ t_TD(max))
RST
(when t_TD ≥ t_TD(max))
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
PB RST Falling Edge Low to
Reset Active
t_PB
20
—
t_PBD
1
4
—
ms Note 1
20
ms
PB RST Rising Edge High to
Reset Inactive
t_RST
250 610
1000
ms
ST Pulse Width
ST Time-out Period
t_ST
20
—
—
ns
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.
DS21370C-page 4
Preliminary
© 2005 Microchip Technology Inc.