CAT853 Datasheet, PDF (1/9 Pages) Catalyst Semiconductor – 3-Pin Microprocessor Power Supply Supervisors

CAT853, CAT863
CAT859, CAT869
3-Pin Microprocessor Power Supply
Supervisors
FEATURES
■ Precision monitoring of +3.3V (-5%, -10%), 5V
(-10% Power Supplies)
■ Active low reset output
■ Reset valid down to V_CC = 1.0V
■ 6μA power supply current
■ Power supply transient immunity
■ Industrial temperature range: -40ºC to +85ºC
■ RoHS-compliant SOT-23 package
APPLICATIONS
■ Computers
■ Servers
■ Laptops
■ Cable modems
■ Wireless communications
■ Embedded control systems
■ White goods
■ Power meters
■ Intelligent instruments
■ PDAs and handheld equipment
DESCRIPTION
The CAT853, CAT863, CAT859, and CAT869 are
supervisory circuits that monitor power supplies in digital
systems.
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. Industry standard threshold
levels are offered to support +3.3V or 5.0V systems.
The CAT859 and CAT869 feature a RESET push-pull
output (active low) for the two pinout options.
The CAT853 and CAT863 feature an open drain RESET
output (active low). Both require a pull-up resistor on
the RESET output.
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 1.0V.
For Ordering Information details, see page 8.
PIN CONFIGURATION
3-Lead SOT23
3-Lead SOT23
RESET ¹
GND 2
CAT853
CAT859
RESET ¹
3 V_CC
V_{CC 2}
CAT863
CAT869
3 GND
THRESHOLD SUFFIX SELECTOR
Nominal Threshold
Voltage
3.08V
2.93V
4.38V
Threshold Suffix
Designation
T
S
M
PIN DESCRIPTIONS
Name
RESET
GND
V_CC
Description
Active low reset. RESET is asserted if V_CC falls below the reset threshold and remains low for at least
140ms after V_CC rises above the reset threshold.
Ground
Power supply voltage that is monitored.
© 2007 by Catalyst Semiconductor, Inc.
1
Characteristics subject to change without notice
Doc. No. 3026, Rev. B