Impala Linear Corporation
ILC811/ILC812
Microprocessor Reset Circuits
October 1999
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 碌A(chǔ) Supply Current
u
140 ms Minimum Reset Pulse Width
u
RESET Remains Valid with V
CC
as Low as 1.4V
u
Active Low Manual Reset Input
u
No External Components
u
4-Pin SOT-143 Package
Applications
u
Critical Microprocessor Power Monitoring
u
Portable Equipment
u
Intelligent Instruments
u
Computers & Printers
u
Controllers
Typical Circuit
V
CC
Ordering Information
Part
ILC811_U
ILC812_U
Package
4-Lead SOT-143
4-Lead SOT-143
Temp. Range
-40擄C to +85擄C
-40擄C to +85擄C
V
CC
ILC811
ILC812
MR
RESET
(RESET)
V
CC
碌P
RESET
INPUT
Place the device suffix of desired reset threshold voltage
from the table below in the blank to complete the part
number.
Reset Threshold Voltage (V)
4.63
4.38
4.00
3.08
2.93
2.63
4
V
CC
Device Suf鏗亁
L
M
J
T
S
R
Pin - Package Configurations
Top View
GND 1
4
V
CC
GND 1
ILC811
RESET 2
3 MR
RESET 2
ILC812
3 MR
Impala Linear Corporation
(408) 730-3778
www.impalalinear.com
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