ILC1832 Datasheet, PDF (1/5 Pages) Impala Linear Corporation – μP SUPERVISORY CIRCUIT

Impala Linear Corporation
ILC1832 ^Preliminary
µP Supervisory Circuit
General Description
Features
The ILC1832 is a multifunction circuit which monitors micro-
processor activity, external reset and power supplies in
microprocessor based systems. Ths circuit functions
include a watchdog timer, power supply monitor, micro-
processor reset, and manual pushbutton reset input.
The power supply line is monitored with a comparator and
an internal voltage reference. RST is forced low when an
out-of-tolerance condition exists and remains asserted for
at least 250ms after V_CC rises above the threshold voltage
(2.55V or 2.88V). The RST pin will remain logic low with
V_CC as low as 1.4V.
The Watchdog input (ST) monitors µP activity and will assert
RST if no µP activity has occurred within the watchdog time-
out period. The watchdog timeout period is selectable with
nominal periods of 150, 600, or 1200 milliseconds.
• Power OK/Reset Time Delay, 250ms min.
• Watchdog Timer, 150 ms, 600ms, or 1.2s Typical
• Precision Supply Voltage Monitor, Select Between 5%
or 10% of Supply Voltage
• 18µA Supply Current
• Debounced External Reset Input
• 8-Pin SOIC or DIP Package
Applications
• Computers
• Controllers
• Critical Microprocessor Power Monitoring
• Intelligent Instruments
• Portable Equipment
Ordering Information
Part
ILC1832N
ILC1832M
Package
8-Lead PDIP
8-Lead SOIC
Temp. Range
-40°C to +85°C
-40°C to +85°C
Typical Circuit
V_CC
V_CC
TD
ILC1832
PBRST
TOL
ST
RST
GND
V_CC
µP
I/O
RESET
Pin-Package Configurations
Top View
PBRST 1
TD 2
TOL 3
GND ⁴
ILC1832
8 V_CC
7 _ST
6 _RST
5 RST
ETC1832N - 8 Lead Plastic DIP Package
ETC1832M - 8 Lead Plastic SOIC Package
Impala Linear Corporation
ILC1832 1.1
[phone] www.impalalinear.com
October 1999 1