NCP1232
Microprocessor Monitor
The NCP1232 is a fully鈥搃ntegrated processor supervisor. It provides
three important functions to safeguard processor functionality:
precision power on/off reset control, watchdog timer and external
reset override.
On power鈥搖p, the NCP1232 holds the processor in the reset state for
a minimum of 250 msec after VCC is within tolerance to ensure a
stable system start鈥搖p.
Microprocessor functionality is monitored by the on鈥揵oard
watchdog circuit. The microprocessor must provide a periodic
low鈥揼oing signal on the ST input. Should the processor fail to supply
this signal within the selected time鈥搊ut period (150 msec, 600 msec or
1200 msec), an out鈥搊f鈥揷ontrol processor is indicated and the
NCP1232 issues a processor reset as a result.
The outputs of the NCP1232 are immediately driven active when
the PB input is brought low by an external push鈥揵utton switch or other
electronic signal. When connected to a push鈥揵utton switch, the
NCP1232 provides contact debounce.
The NCP1232 is packaged in a space鈥搒aving 8鈥損in plastic SOIC
package and requires no external components.
Features
http://onsemi.com
MARKING
DIAGRAM
8
8
1
SO鈥?
D SUFFIX
1
YY, Y
WW
X
Z
= Year
= Work Week
= Assembly ID Code
= Subcontractor ID Code
NCP
1232
YWWXZ
PIN CONNECTIONS
8鈥揚in SOIC
NCP1232D
PB RST
TD
TOL
GND
1
2
3
4
8
7
6
5
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Precision Voltage Monitor
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(Adjustable +4.5 V or +4.75 V)
Reset Pulse Width (250 msec Min)
No External Components
Adjustable Watchdog Timer
(150 msec, 600 msec or 1.2 sec)
Debounced Manual Reset Input for External Override
VCC
ST
RST
RST
(Top View)
Applications
ORDERING INFORMATION
Device
NCP1232DR2
Package
SO鈥?
Shipping
2500 Tape & Reel
Computers
Controllers
Intelligent Instruments
Automotive Systems
Critical
碌P
Power Monitoring
漏
Semiconductor Components Industries, LLC, 2000
1
May, 2000 鈥?Rev. 0
Publication Order Number:
NCP1232/D
NCP1232DR2相關(guān)型號PDF文件下載
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型號
版本
描述
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