Impala Linear Corporation
ILC705/706/707/708
mP Supervisory Circuit
General Description
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.
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.
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.
Features
!
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
Battery Detect
!
8-Pin SOIC or DIP Package
Applications
!
Computers
!
Controllers
!
Critical Microprocessor Power Monitoring
!
Intelligent Instruments
!
Portable Equipment
!
Controllers
Pin Package Configuration
Typical Circuit
Top View
Manual
Reset
MR
1
8
7
6
5
+5 V (Regulated)
WDO
RESET
WDI
PFO
V
CC
MR
RESET
V
CC
RESET
V
CC
2
GND
3
PFI
4
ILC705
ILC706
DC Voltage
(Unregulated)
PFI
ILC705
ILC706
WDI
WDO
GND PFO
I/O Line
NMI
碌
P
Interrupt
MR
1
8
7
6
5
RESET
RESET
NC
PFO
V
CC
2
GND
3
PFI
4
ILC707
ILC708
Ordering Information
Part
ILC70_N
ILC70_M
Package
8-Lead PDIP
8-Lead SOIC
Temp. Range
-40擄C to +85擄C
-40擄C to +85擄C
N Package - 8 Lead Plastic DIP Package
M Package - 8 Lead Plastic SOIC Package
Impala Linear Corporation
ILC705-708 1.0
(408) 574-3939
www.impalalinear.com
Sept 1999
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