CAT811, CAT812
4-Pin Microprocessor Power Supply Supervisors
FEATURES
s
Precision monitoring of
H
GEN
FR
ALO
EE
LE
A
D
F
R
E
E
TM
s
Direct replacements for the MAX811 and
+5.0 V (+/- 5%, +/- 10%, +/- 20%),
+3.3 V (+/- 5%, +/ 10%),
+3.0 V (+/- 10%) and
+2.5 V (+/- 5%) power supplies
s
Offered in two output configurations:
MAX812 in applications operating over the
industrial temperature range
s
Reset valid down to V
CC
= 1.0 V
s
6
µ
A power supply current
s
Power supply transient immunity
s
Compact 4-pin SOT143 package
s
Industrial temperature range: -40˚C to +85˚C
- CAT811: Active LOW reset
- CAT812: Active HIGH reset
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Manual reset input
APPLICATIONS
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Computers
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Servers
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Laptops
s
Cable modems
s
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
DESCRIPTION
The CAT811 and CAT812 are
µP
supervisory circuits
that monitor power supplies in digital systems. 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.
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
(RESET)
2
3
© 2004 by Catalyst Semiconductor, Inc., Patent Pending
Characteristics subject to change without notice
Doc. No. 3005, Rev. P
CATALYST [ CATALYST SEMICONDUCTOR ]
