CAT811_08 Datasheet, PDF (1/11 Pages) Catalyst Semiconductor – 4-Pin Microprocessor Power Supply Supervisors with Manual Reset

CAT811, CAT812
4-Pin Microprocessor Power Supply Supervisors
with Manual Reset
FEATURES
„ Precision monitoring of
+5.0 V (± 5%, ± 10%, ± 20%),
+3.3 V (± 5%, ± 10%),
+3.0 V (± 10%) and
+2.5 V (± 5%) power supplies
„ Manual reset input
„ Offered in two output configurations:
„ CAT811: Active LOW reset
„ CAT812: Active HIGH reset
„ Direct replacements for the MAX811 and
MAX812 in applications operating over the
industrial temperature range
„ Reset valid down to V_CC = 1.0V
„ 6µA power supply current
„ Power supply transient immunity
„ Available in SOT-143 packages with Sn or
NiPdAu Green Lead finishes.
„ Industrial temperature range: -40ºC to +85ºC
APPLICATION
„ Computers, Servers, Laptops
„ Cable modems
„ Wireless communications
„ Embedded control systems
„ White goods
„ Power meters
„ Intelligent instruments
„ PDAs and handheld equipment
THRESHOLD SUFFIX SELECTOR
DESCRIPTION
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
DESCRIPTION
The CAT811 and CAT812 are microprocessor supervi-
sory 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 140ms 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
+5.0V, +3.3V, +3.0V and +2.5V 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
Vcc 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 SOT-143 package.
For Ordering Information details, see page 10.
PIN CONFIGURATION
GND 1
CAT811
CAT812
4 V_CC
R¯¯E¯S¯E¯T¯ 2
3 ¯M¯R¯
© Catalyst Semiconductor, Inc.
1
Characteristics subject to change without notice
Doc. No. MD-3005 Rev. S