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PDF CAT885 Data sheet ( Hoja de datos )
| Número de pieza | CAT885 | |
| Descripción | Five-Channel Power Supply Supervisors | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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CAT885
Five-Channel Power Supply Supervisors
FEATURES
Five-channel supply voltage detection
2 VDD 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 VDD = 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
VDD
VDD2
VSS
2
3
4
CAT885
8 ¯R¯S¯T¯
7 V5MON
6 V4MON
5 V3MON
See page 2 for pin functions
TYPICAL APPLICATION
VDD
VDD2
V3MON
RST
CAT885
V4MON
MR
V5MON VSS
Reset
Signal
PB
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
1
Doc. No. MD-3028 Rev. C
1 page  
www.DataShCeeAt4UT.c8om85
POWER ON RESET (POR)
Applying power to the CAT885 activates a POR circuit
which activates the reset output (active LOW). At
power-up POR prevents the system microprocessor
from starting to operate with insufficient voltage and
prior to stabilization of the clock oscillator. It ensures
that operation is precluded until internal registers are
properly loaded, FPGA’s have downloaded their
configuration data prior and all system power supplies
are above minimum operating levels and stable. The
reset signal remains active until VDD rises above the
minimum preset voltage level for time period tPD.
MANUAL RESET
The manual-reset input (¯M¯R¯) allows the user to trigger
a reset by using a push-button switch or by
electronically driving the input low. The ¯M¯R¯ input is an
active LOW debounced input. Reset is asserted
anytime the ¯M¯R¯ pin is pulled low to less than 100mV
for the minimum ¯M¯R¯ pulse width or longer. The reset
output remains asserted low for tPD , typically 120ms
and then is released. Figures 2 and 3 illustrate the
CAT885’s operation and ¯R¯S¯T¯ output response times.
VDD/
VDD2
0
MR
0
RST
0
VTH1/2
1V
tPD tRPD
tPD
>TPW
tPD
tRPD
Figure 2. Power Supply Monitoring Diagram
VMON
VTH
0
RST
0
tRPD
tPD
Figure 3. Auxillary Voltage Monitoring Diagram
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
5
Doc. No. MD-3028 Rev. C
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet CAT885.PDF ] | |
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