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Impala Linear Corporation
October 1999
Typical Circuit
Impala Linear Corporation
1
(408) 730-3778
www.impalalinear.com
ILC811/ILC812
Microprocessor Reset Circuits
General Description
The ILC811/ILC812 is a low cost microprocessor supervisory
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
accommodate systems operating at 3 V, 3.3 V or 5 V.
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 140 ms
after V
CC
has risen above the designated reset threshold. The
ILC811/ILC812 is available in a 4-pin SOT-143 package.
Features
u
Precision Voltage Monitor for 3 V, 3.3 V or 5 V Power
Supplies
u
6 μA Supply Current
u
140 ms Minimum Reset Pulse Width
u
RESET Remains Valid with V
u
Active Low Manual Reset Input
u
No External Components
u
4-Pin SOT-143 Package
CC
as Low as 1.4V
Applications
u
Critical Microprocessor Power Monitoring
u
Portable Equipment
u
Intelligent Instruments
u
Computers & Printers
u
Controllers
Pin - Package Configurations
ILC811
V
CC
Top View
RESET
MR
GND
2
1
4
3
ILC812
RESET
MR
GND
2
1
4
3
V
CC
ILC811
ILC812
μP
V
CC
V
CC
RESET
(RESET)
RESET
INPUT
MR
V
CC
Ordering Information
Place the device suffix of desired reset threshold voltage
from the table below in the blank to complete the part
number.
Part
Package
4-Lead SOT-143
4-Lead SOT-143
Temp. Range
-40°C to +85°C
-40°C to +85°C
ILC811_U
ILC812_U
Reset Threshold Voltage (V)
4.63
4.38
4.00
3.08
2.93
2.63
Device Suffix
L
M
J
T
S
R