Impala Linear Corporation
ILC811/812
Preliminary
Microprocessor Reset Circuits
General Description
The ILC811/ILC812 is a low cost microprocessor superviso-
ry circuit that asserts a reset if the power supply drops below
a designated threshold or the manual reset pin is forced low.
Several different reset thresholds are available to accom-
modate systems operating at 3V, 3.3V or 5V.
The ILC811 has an active low RESET output, while the
ILC812 offers an active high RESET output. The reset output
is guaranteed to remain asserted for a minimum of 140ms
after V
CC
has risen above the designated reset threshold.
The ILC811/ILC812 is available in a 4-pin SOT-143
Features
!
Precision Voltage Monitor for 3V, 3.3V or 5V Power Supplies
!
6mA Supply Current
!
140ms Minimum Reset Pulse Width
!
RESET Remains Valid with V
CC
as Low as 1.4V
!
Active Low Manual Reset Input
!
No External Components
!
4-Pin SOT-143 Package
Applications
Typical Circuit
V
CC
V
CC
ILC811
ILC812
MR
RESET
(RESET)
V
CC
!
Critical Microprocessor Power Monitoring
!
Portable Equipment
!
Intelligent Instruments
!
Computers & Printers
!
Controllers
µ
P
RESET
INPUT
Ordering Information
Part
ILC811_U
ILC812_U
Package
4-Lead SOT-143
4-Lead SOT-143
Temp. Range
-40°C to +85°C
-40°C to +85°C
( ) = ILC812
Place the device suffix of desired reset threshold voltage from the
table [below] in the blank to complete the part number.
Pin Package Configuration
Top View
GND
1
ILC811
RESET
2
3
MR
4
V
CC
Reset Threshold Voltage (V)
4.63
4.38
4.00
3.08
2.93
2.63
Device Suffix
L
M
J
T
S
R
GND
1
ILC812
RESET
2
4
V
CC
3
MR
Impala Linear Corporation
ILC811/812 1.3
(408) 574-3939
www.impalalinear.com
Sept 1999
1
IMPALA [ Impala Linear Corporation ]
