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PDF CAT853 Data sheet ( Hoja de datos )

Número de pieza CAT853
Descripción 3-Pin Microprocessor Power Supply Supervisors
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No Preview Available ! CAT853 Hoja de datos, Descripción, Manual

CAT853, CAT863www.DataSheet4U.com
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 VCC = 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
VCC 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 VCC
VCC 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
VCC
Function
Active low reset. R¯¯E¯S¯E¯T¯ is asserted if VCC falls below the reset threshold and remains low for at
least 140 ms after VCC rises above the reset threshold
Ground
Power supply voltage that is monitored
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
1
Doc. No. MD-3026, Rev. G

1 page




CAT853 pdf
DETAILED DESCRIPTION
RESET TIMING
The reset signal is asserted low for the CAT853,
CAT863, CAT859, and CAT869 when the power
supply voltage falls below the threshold trip voltage
and remains asserted for at least 140 ms after the
power supply voltage has risen above the threshold.
CAT853, CAT863, CwAwTw8.D5at9aS,hCeetA4UT.c8om69
Power 5 V
Supply
Voltage 0 V
5V
RESET
0V
Threshold
Voltage
Reset Timeout Period
140 ms
minimum
Figure 1. Reset Timing Diagram
VCC TRANSIENT RESPONSE
The CAT853, CAT863, CAT859, and CAT869 protect
µPs against brownout failure. Short duration
transients of 4 µs or less and 100 mV amplitude
typically do not cause a false RESET.
Figure 2 shows the maximum pulse duration of
negative-going VCC transients that do not cause a
reset condition. As the amplitude of the transient goes
further below the threshold (increasing VTH - VCC), the
maximum pulse duration decreases. In this test, the
VCC starts from an initial voltage of 0.5 V above the
threshold and drops below it by the amplitude of the
overdrive voltage (VTH - VCC).
TAMB = 25ºC
“C” THRESHOLD
“M” THRESHOLD
RESET OVERDRIVE VTH - VCC [mV]
Figure 2. Maximum Transient Duration Without Causing a Reset Pulse vs. Reset Comparator Overdrive
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
5
Doc. No. MD-3026, Rev. G

5 Page










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