Impala Linear Corporation
ILC705/706/707/708
mP Supervisory Circuit
General Description
Features
The ILC705/ILC706/ILC707/ILC708 are low cost micro-
processor supervisory circuits that monitor power sup-
plies in microprocessor based systems. Circuit functions
include a watchdog timer, microprocessor reset, power
failure warning and a debounced manual reset input.
! 4.4V or 4.65V Precision Voltage Monitor
! 200ms Reset Pulse Width
! Debounced TTL/CMOS Compatible Manual Reset Input
! Watchdog Timer with 1.6 sec Timeout (ILC705/ILC706)
! Voltage Monitor for Early Power Fail Warning or Low
The ILC705 and ILC706 offer a watchdog timer function
while the ILC707 and ILC708 have an active high reset
output in addition to the active low reset output.
Battery Detect
! 8-Pin SOIC or DIP Package
Applications
Supply voltage monitor levels of 4.65V and 4.4V are
available. The ILC705/ILC707 have a nominal reset
threshold level of 4.65V while the ILC706 and ILC708
have a 4.4V nominal reset threshold level. When the sup-
ply voltage drops below the respective reset threshold
level, RESET is asserted.
! Computers
! Controllers
! Critical Microprocessor Power Monitoring
! Intelligent Instruments
! Portable Equipment
! Controllers
Pin Package Configuration
Typical Circuit
+5 V (Regulated)
Top View
Manual
Reset
MR
VCC
1
2
3
4
8
7
6
5
WDO
RESET
WDI
VCC
RESET
VCC
RESET
MR
ILC705
ILC706
ILC705
ILC706
µP
GND
PFI
DC Voltage
(Unregulated)
I/O Line
NMI
WDI
WDO
PFI GND PFO
PFO
Interrupt
1
2
3
4
8
7
6
5
MR
VCC
RESET
RESET
NC
ILC707
ILC708
GND
PFI
Ordering Information
PFO
Part
Package
Temp. Range
ILC70_N
ILC70_M
8-Lead PDIP -40°C to +85°C
8-Lead SOIC -40°C to +85°C
N Package - 8 Lead Plastic DIP Package
M Package - 8 Lead Plastic SOIC Package
Impala Linear Corporation
ILC705-708 1.0
www.impalalinear.com
(408) 574-3939
Sept 1999
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