TC1232_13 Datasheet, PDF (6/20 Pages) Microchip Technology – Microprocessor Monitor

TC1232
3.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1: PIN FUNCTION TABLES
Pin No.
8-pin
PDIP,
SOIC
16-pin
SOIC
Symbol
Pin
Type
Buffer/
Driver
Type
Function
1
2 PB RST I
2
4
TD
I
3
6
TOL
I
4
8
GND —
5
9
RST O
6
11
RST O
7 13
ST
I
8
15
V_CC
—
— 1,3,5, NC —
7,10,1
2,16
ST Push-button Reset Input.
Input for a Manual Reset Switch. This input debounces (ignores) pulses
less than 1 ms in duration and is ensured to recognize inputs of 20 ms or
greater.
L = Manual Reset Switch is Active, Force RST/RST pins Active
H = Manual Reset Switch is Inactive. State of RST/RST pins determined by
other system conditions.
ST Time Delay Input.
The voltage level on this input determines the watchdog timer time-out
period.
TD = 0V  t_TD = 150 ms
TD = Open  t_TD = 600 ms
TD = V_CC  t_TD = 1.2 sec
ST Tolerance Input.
TOL = GND, Max Voltage Trip Point (V_CCTP) = 4.75V (5% tolerance)
TOL = V_CC, Max Voltage Trip Point (V_CCTP) = 4.5V (10% tolerance)
P The ground reference for the device.
Push
Pull
Reset Output (Active-High)
Goes active (High) if one of these conditions occurs:
1. If V_CC falls below the selected reset voltage threshold.
2. If PB RST pin is forced low.
3. If ST pin is not strobed within the minimum selected time-out period.
(see TD pin)
4. During power-up
Open
Drain
Reset Output (Active-Low)
Goes active (Low) if one of these conditions occurs:
1. If V_CC falls below the selected reset voltage threshold.
2. If PB RST pin is forced low.
3. If ST pin is not strobed within the minimum selected time-out period.
(see TD pin)
4. During power-up
ST Strobe Input
Input for Watchdog Timer. WDT period determined by state of TD pin
Falling Edge  Resets Watchdog Timer counter (no time-out)
P The positive supply (+5V) for the device.
— No internal connection.
DS21370D-page 6
Preliminary
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