CAT811, CAT812
4-Pin Microprocessor Power Supply Supervisors with Manual Reset
FEATURES
s
Precision monitoring of
DESCRIPTION
The CAT811 and CAT812 are microprocessor
supervisory circuits that monitor power supplies. The
CAT811 and CAT812 are direct replacements for the
MAX811 and MAX812 in applications operating over the
industrial temperature range; both have a manual reset
input.
These devices generate a reset signal, which is asserted
while the power supply voltage is below a preset threshold
level and for at least 140 ms after the power supply level
has risen above that level. The underlying floating gate
technology, AE
2(TM)
used by Catalyst Semiconductor,
makes it possible to offer any custom reset threshold
value. Seven industry standard threshold levels are
offered to support +5.0 V, +3.3 V, +3.0 V and +2.5 V
systems.
The CAT811 features a
RESET
push-pull output (active
LOW) and the CAT812 features a RESET push-pull
output (active HIGH).
Fast transients on the power supply are ignored and the
output is guaranteed to be in the correct state at V
cc
levels as low as 1.0 V.
The CAT811/812 are fully specified over the industrial
temperature range (-40°C to 85°C) and are available in
a compact 4-pin SOT143 package.
+5.0 V (
±
5%,
±
10%,
±
20%),
+3.3 V (
±
5%,
±
10%),
+3.0 V (
±
10%) and
+2.5 V (
±
5%) power supplies
s
Manual reset input
s
Offered in two output configurations:
- CAT811: Active LOW reset
- CAT812: Active HIGH reset
s
Direct replacements for the MAX811 and
MAX812 in applications operating over the
industrial temperature range
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Reset valid down to V
CC
= 1.0 V
s
6
µ
A power supply current
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Power supply transient immunity
s
Available in SOT-143 packages with Sn or
NiPdAu Green Lead finishes.
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Industrial temperature range: -40°C to +85°C
°
°
APPLICATIONS
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Computers
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Servers
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Laptops
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Cable modems
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Wireless communications
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Embedded control systems
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White goods
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Power meters
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Intelligent instruments
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PDAs and handheld equipment
THRESHOLD SUFFIX SELECTOR
Nominal Threshold
Voltage
4.63V
4.38V
4.00V
3.08V
2.93V
2.63V
2.32V
Threshold Suffix
Designation
L
M
J
T
S
R
Z
1
PIN CONFIGURATION
GND
1
CAT811
CAT812
4
VCC
RESET
2
3
MR
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc. No. 3005, Rev. R
CATALYST [ CATALYST SEMICONDUCTOR ]
