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TelCom Semiconductor
TelCom Semiconductor

TC1232 Datasheet Preview

TC1232 Datasheet

MICROPROCESSOR MONITOR

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TC1232 pdf
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



TelCom Semiconductor
TelCom Semiconductor

TC1232 Datasheet Preview

TC1232 Datasheet

MICROPROCESSOR MONITOR

No Preview Available !

TC1232 pdf
MICROPROCESSOR MONITOR
TC1232
ABSOLUTE MAXIMUM RATINGS*
Voltage on Any Pin (With Respect to GND) – 0.3V to +5.8V
Operating Temperature Range:
TC1232C .......................................... 0°C to +70°C
TC1232E ..................................... – 40°C to + 85°C
Storage Temperature Range ................ – 65°C to +150°C
Lead Temperature (Soldering, 10 sec) ................. +300°C
*Stresses beyond those listed under "Absolute Maximum Ratings" may
cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond
those indicated in the operational sections of the specifications is not
implied. Exposure to absolute maximum rating conditions for extended
periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS: TA = TMIN to TMAX; VCC = +4.5V to 5.5V, unless otherwise specified.
Symbol
Parameter
Test Conditions
Min Typ Max Unit
VCC
VIH
VIL
IL
IOH
IOL
ICC
VCCTP
VCCTP
Supply Voltage
ST and PB RST
Input High Level
ST and PB RST
Input Low Level
Input Leakage ST, TOL
Output Current RST
Current RST, RST
Operating Current
VCC 5% Trip Point (Note 3)
VCC 10% Trip Point (Note 3)
Note 1
VOH = 2.4V
VOL = 0.4V
Note 2
TOL = GND
TOL = VCC
4.5
2.0
– 0.3
– 1.0
– 1.0
2.0
4.50
4.25
5.0 5.5 V
VCC +0.3
V
— +0.8 V
+1.0
µA
–12 — mA
10 — mA
50 200 µA
4.62 4.74 V
4.37 4.49 V
CAPACITANCE (Note 4): TA = +25°C
Symbol
Parameters
CIN
COUT
Input Capacitance ST, TOL
Output Capacitance RST, RST
Test Conditions
Min Typ Max Units
— — 5 pF
— — 7 pF
AC ELECTRICAL CHARACTERISTICS: TA = TMIN to TMAX; VCC = +5V to +10%, unless otherwise specified.
Symbol
Parameters
Test Conditions
Min Typ Max Units
tPB PB RST (Note 5)
tPBD PB RST Delay
tRST Reset Active Time
tST ST Pulse Width
tTD ST Time-out Period
tF VCC Fall Time (Note 4)
Figure 3
Figure 3
Figure 4
Figure 4
TD Pin = 0V
TD Pin = Open
TD Pin = VCC
Figure 5
20 —
— msec
1 4 20 msec
250 610 1000 msec
75 —
— nsec
62.5 150
250 msec
250 600 1000 msec
500 1200 2000 msec
10 —
µsec
5-20 TELCOM SEMICONDUCTOR, INC.


Part Number TC1232
Description MICROPROCESSOR MONITOR
Maker TelCom Semiconductor
Total Page 6 Pages
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