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PDF CAT853 Data sheet ( Hoja de datos )

Número de pieza CAT853
Descripción 3-Pin Microprocessor Power Supply Supervisors
Fabricantes Catalyst Semiconductor 
Logotipo Catalyst Semiconductor Logotipo



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CAT853, CAT863www.DataSheet4U.com
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 VCC = 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 Vcc
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 VCC
VCC 2
CAT863
CAT869
3 GND
THRESHOLD SUFFIX SELECTOR
Nominal Threshold
Voltage
3.08V
2.93V
4.38V
Threshold Sufx
Designation
T
S
M
PIN DESCRIPTIONS
Name
RESET
GND
VCC
Description
Active low reset. RESET is asserted if VCC falls below the reset threshold and remains low for at least
140ms after VCC rises above the reset threshold.
Ground
Power supply voltage that is monitored.
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 3026, Rev. B

1 page




CAT853 pdf
VALID RESET WITH VCC UNDER 1.0V
To ensure that the CAT859 and CAT869 RESET pin
is in a known state when VCC is under 1.0V, a >10kΩ
pull-down resistor between RESET pin and GND is
recommended.
Power
Supply
VCC
CAT8x9
RESET
GND
Figure 3. RESET Valid with VCC Under 1.0V
CAT853, CAT863, CAwTww8.5Da9ta,ShCeeAt4UT.c8om69
BI-DIRECTIONAL RESET PIN INTERFACING
The CAT859 and CAT869 can interface with μP/μC
bi-directional reset pins by connecting a 4.7kΩ resistor
in series with the CAT859 and CAT869 reset output and
the μP/μC bi-directional reset pin.
Power
Supply
BUF
Buffered
RESET
VCC
CAT8x9
RESET
VCC
µP
RESET
INPUT
GND
Bi-directional
I/O Pin
GND
(For example:
68HC11)
Figure 4. Bi-directional Reset Pin Interfacing
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
Doc No. 3026, Rev. B

5 Page










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