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PDF TC1232 Data sheet ( Hoja de datos )
| Número de pieza | TC1232 | |
| Descripción | MICROPROCESSOR MONITOR | |
| Fabricantes | TelCom Semiconductor | |
| Logotipo |  |
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1PRELIMINARY INFORMATION
TC1232
MICROPROCESSOR MONITOR
FEATURES
s Precision Voltage
Monitor ....................... Adjustable +4.5V or +4.75V
s Reset Pulse Width ............................. 250msec Min
s No External Components
s Adjustable Watchdog
Timer ........................ 150msec, 600msec or 1.2sec
s Debounced Manual Reset Input for External
Override
APPLICATIONS
s Computers
s Controllers
s Intelligent Instruments
s Automotive Systems
s Critical µP Power Monitoring
ORDERING INFORMATION
Part No.
Package
TC1232COA
TC1232COE
TC1232CPA
TC1232EOA
TC1232EOE
TC1232EPA
8-Pin SOIC
16-Pin SOIC (Wide)
8-Pin PDIP
8-Pin SOIC
16-Pin SOIC (Wide)
8-Pin PDIP
Temp. Range
0°C to +70°C
0°C to +70°C
0°C to +70°C
– 40°C to +85°C
– 40°C to +85°C
– 40°C to +85°C
GENERAL DESCRIPTION
The TC1232 is a fully-integrated processor supervisor.
It provides three important functions to safeguard processor
sanity: precision power on/off reset control, watchdog timer
and external reset override.
On power-up, the TC1232 holds the processor in the
reset state for a minimum of 250msec after VCC is within
tolerance to ensure a stable system start-up.
Microprocessor sanity is monitored by the on-board
watchdog circuit. The microprocessor must provide a peri-
odic low-going signal on the ST input. Should the processor
fail to supply this signal within the selected time-out period
(150msec, 600msec or 1200msec), an out-of-control pro-
cessor is indicated and the TC1232 issues a processor reset
as a result.
The outputs of the TC1232 are immediately driven
active when the PB input is brought low by an external push-
button switch or other electronic signal. When connected to
a push-button switch, the TC1232 provides contact
debounce.
The TC1232 is packaged in a space-saving 8-pin plastic
DIP or SOIC package and requires no external components.
2
3
4
5
FUNCTIONAL BLOCK DIAGRAM
VCC
TOL
5%/10%
TOLERANCE
SELECT
+
–
+
REF
RESET
GENERATOR
6RST
RST
PB RST
DEBOUNCE
TC1232
7
TD WATCHDOG
TIMEBASE
SELECT
TELCOM SEMICONDUCTOR, INC.
GND
WATCHDOG
TIMER
ST
8
TC1232-4 11/6/96
5-19
1 page  
MICROPROCESSOR MONITOR
tPB
PB RST
tPBD
RST
RST
VIL
VIH
tRST
tF
VCC
+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
tST
ST
tTD
NOTE:
tTD 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
tTD
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
VCC
TELCOM SEMICONDUCTOR, INC.
Figure 5. Power-Down Slew Rate
tR
+4.75V
+4.25V
4
5
6
Figure 6. Power-Up Slew Rate
7
8
5-23
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet TC1232.PDF ] | |
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