CAT885 Datasheet, PDF (1/8 Pages) ON Semiconductor – Five-Channel Power Supply Supervisors

CAT885
Five-Channel Power Supply Supervisors
FEATURES
„ Five-channel supply voltage detection
„ 2 V_DD inputs allow monitoring of
+5.0V, +3.3V, +3.0V, +2.5V or +1.8V supplies
„ 3 adjustable voltage inputs allow monitoring
supplies > 0.6V
„ 70ms minimum reset delay
„ Manual reset capability
„ Reset signals valid down to V_DD = 1V
„ Accurate ± < 2% voltage threshold
„ Power-supply transients suppressed
„ Low 2µA maximum supply current at 5V
„ RoHS-compliant MSOP package
APPLICATIONS
„ Telecom & datacom systems
„ Routers & servers
„ Data storage equipment
„ Set-top boxes
„ Multi-voltage systems
DESCRIPTION
The CAT885 is a five-channel power supply
supervisory circuit with high reset thereshold accuracy
and very low power consumption. The device features
an open-drain output, active-low function with manual
reset to perform basic system reset and monitoring
functions for a wide range of electronic products. The
CAT885 monitors five system voltages by maintaining a
reset output active until all the power supply voltages
exceed the specified trip values. The device then
maintains the reset output in an active condition until
the internal timer times out, which allows the system
power supplies to stabilize.
Two of the five voltage detectors are factory set for
standard supplies, while the threshold voltages of the
third, fourth, and fifth voltage monitors can be adjusted
for specific system design requirements using external
resistors.
The CAT885 lowers system costs and saves board
space by integrating five channels into a single, small
MSOP 8-lead package.
For Ordering Information details see page 7.
PIN CONFIGURATION
MSOP 8-Lead (Z)
(top view)
¯M¯R¯ 1
V_DD 2
V_DD2 3
V_SS 4
CAT885
8 ¯R¯S¯T¯
7 V5MON
6 V4MON
5 V3MON
See page 2 for pin functions
TYPICAL APPLICATION
V_DD
V_DD2
V3MON
RST
CAT885
V4MON
MR
V5MON
V_SS
Reset
Signal
PB
© 2009 SCILLC. All rights reserved.
1
Characteristics subject to change without notice
Doc. No. MD-3028 Rev. C