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TC1232EOE Scheda tecnica(PDF) 1 Page - TelCom Semiconductor, Inc

Il numero della parte TC1232EOE
Spiegazioni elettronici  MICROPROCESSOR MONITOR
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Produttore elettronici  TELCOM [TelCom Semiconductor, Inc]
Homepage  http://www.telcom-semi.com
Logo TELCOM - TelCom Semiconductor, Inc

TC1232EOE Scheda tecnica(HTML) 1 Page - TelCom Semiconductor, Inc

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TELCOM SEMICONDUCTOR, INC.
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PRELIMINARY INFORMATION
TC1232
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
MICROPROCESSOR MONITOR
APPLICATIONS
s
Computers
s
Controllers
s
Intelligent Instruments
s
Automotive Systems
s
Critical
µP Power Monitoring
FUNCTIONAL BLOCK DIAGRAM
VCC
TC1232
+
5%/10%
TOLERANCE
SELECT
TOL
DEBOUNCE
WATCHDOG
TIMEBASE
SELECT
PB RST
TD
GND
REF
WATCHDOG
TIMER
RESET
GENERATOR
RST
RST
ST
+
ORDERING INFORMATION
Part No.
Package
Temp. Range
TC1232COA
8-Pin SOIC
0
°C to +70°C
TC1232COE
16-Pin SOIC (Wide)
0
°C to +70°C
TC1232CPA
8-Pin PDIP
0
°C to +70°C
TC1232EOA
8-Pin SOIC
– 40
°C to +85°C
TC1232EOE
16-Pin SOIC (Wide)
– 40
°C to +85°C
TC1232EPA
8-Pin PDIP
– 40
°C to +85°C
TC1232-4
11/6/96
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.


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