TC1232 Datasheet, PDF (5/6 Pages) TelCom Semiconductor, Inc – MICROPROCESSOR MONITOR

MICROPROCESSOR MONITOR
t_PB
PB RST
t_PBD
V_IL
RST
RST
V_IH
t_RST
t_F
V_CC
+4.75V
+4.25V
1
TC1232
2
3
Figure 3. Push-button Reset. The debounced PB RST input
ignores input pulses less than 1msec and is guaranteed
to recognize pulses of 20msec or greater
PUSH-BUTTON RESET
t_ST
ST
t_TD
NOTE:
t_{TD IS THE MAXIMUM ELAPSED TIME BETWEEN ST HIGH-TO-LOW}
TRANSITIONS (ST IS ACTIVATED BY FALLING EDGES ONLY) WHICH
WILL KEEP THE WATCHDOG TIMER FROM FORCING THE RESET
OUTPUTS ACTIVE FOR A TIME OF ^{tRST. tTD} IS A FUNCTION OF THE
VOLTAGE AT THE TD PIN, AS TABULATED BELOW.
CONDITON
t_TD
MIN
TYP
MAX
TD PIN = 0V
TD PIN = OPEN
TD PIN = VCC
62.5msec
250msec
500msec
150msec
600msec
1200msec
250msec
1000msec
2000msec
Figure 4. Strobe Input
V_CC
TELCOM SEMICONDUCTOR, INC.
4
Figure 5. Power-Down Slew Rate
5
t_R
+4.75V
6
+4.25V
Figure 6. Power-Up Slew Rate
7
8
5-23