CAT853 Datasheet, PDF (7/10 Pages) Catalyst Semiconductor – 3-Pin Microprocessor Power Supply Supervisors

CAT853 AND CAT863 OPEN-DRAIN R¯¯E¯S¯E¯T¯
APPLICATION
The CAT853 and CAT863 features an open-drain
RESET output and therefore need a pull-up resistor
on the output for proper operation, as shown on
Figure 5. An advantage of the open-drain output
includes the ability to “wire AND” several outputs
together to form an inexpensive logic circuit. It is also
possible to have the pull-up resistor connected to a
different supply which can be higher than the CAT8x3
V_CC pin. The value of the pull-up resistor is not critical
in most applications, typical values being between
5 kΩ and 10 kΩ.
Power
Supply
V_CC
CAT8x3
RESET
GND
CAT853, CAT863, CAT859, CAT869
5kΩ
V_CC
µP
RESET
INPUT
GND
Figure 5. Typical CAT8x3 Open-Drain Circuit Configuration
© 2009 SCILLC. All rights reserved.
7
Characteristics subject to change without notice
Doc. No. MD-3026, Rev. G