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參數(shù)資料
| 型號： | TC1232EPA |
| 廠商： | TelCom Semiconductor, Inc. |
| 英文描述： | MICROPROCESSOR MONITOR |
| 中文描述： | 微處理器監(jiān)控 |
| 文件頁數(shù)： | 1/6頁 |
| 文件大?。?/td> | 65K |
| 代理商： | TC1232EPA |
5-19
TELCOM SEMICONDUCTOR, INC.
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PRELIMINARY INFORMATION
TC1232
FEATURES
I
Precision Voltage
Monitor ....................... Adjustable +4.5V or +4.75V
Reset Pulse Width ............................. 250msec Min
No External Components
Adjustable Watchdog
Timer........................ 150msec, 600msec or 1.2sec
Debounced Manual Reset Input for External
Override
I
I
I
I
MICROPROCESSOR MONITOR
APPLICATIONS
I
I
I
I
I
Computers
Controllers
Intelligent Instruments
Automotive Systems
Critical
μ
P Power Monitoring
FUNCTIONAL BLOCK DIAGRAM
V
CC
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
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
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
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 V
CC
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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| TC12CVCT | LOW COST, ONE WIRE DIGITAL THERMOMETER WITH SHUTDOWN |
| TC12NVCT | LOW COST, ONE WIRE DIGITAL THERMOMETER WITH SHUTDOWN |
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