CAT853 Datasheet, PDF (1/10 Pages) Catalyst Semiconductor – 3-Pin Microprocessor Power Supply Supervisors

CAT853, CAT863
CATCAT859, CAT869
3-Pin Microprocessor Power Supply Supervisors
FEATURES
„ Precision monitoring of +3.3 V (-5%, -10%), 5 V
(-10% Power Supplies)
„ Active low reset output
„ Reset valid down to V_CC = 1.0 V
„ 6 µA 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
+3.3 V or 5.0 V systems.
The CAT859 and CAT869 feature a R¯¯E¯S¯E¯T¯ push-pull
output (active low) for the two pinout options.
The CAT853 and CAT863 feature an open drain
R¯¯E¯S¯E¯T¯ 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 1.0 V.
For Ordering Information details, see page 9.
PIN CONFIGURATION
THRESHOLD SUFFIX SELECTOR
SOT-23 3-Lead
SOT-23 3-Lead
RESET ¹
GND 2
CAT853
CAT859
RESET ¹
3 V_CC
V_{CC 2}
CAT863
CAT869
3 GND
Nominal Threshold
Voltage
4.38 V
4.20 V
3.08 V
2.93 V
2.4 V
Threshold Suffix
Designation
M
F
T
S
C
PIN DESCRIPTION
Pin Name
R¯¯E¯S¯E¯T¯
GND
V_CC
Function
Active low reset. R¯¯E¯S¯E¯T¯ is asserted if V_CC falls below the reset threshold and remains low for at
least 140 ms after V_CC rises above the reset threshold
Ground
Power supply voltage that is monitored
© 2009 SCILLC. All rights reserved.
1
Characteristics subject to change without notice
Doc. No. MD-3026, Rev. G