CAT853 Datasheet, PDF (5/9 Pages) Catalyst Semiconductor – 3-Pin Microprocessor Power Supply Supervisors

VALID RESET WITH V_CC UNDER 1.0V
To ensure that the CAT859 and CAT869 RESET pin
is in a known state when V_CC is under 1.0V, a >10kΩ
pull-down resistor between RESET pin and GND is
recommended.
Power
Supply
V_CC
CAT8x9
RESET
GND
Figure 3. RESET Valid with V_CC Under 1.0V
CAT853, CAT863, CAT859, CAT869
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
V_CC
CAT8x9
RESET
V_CC
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.
5
Characteristics subject to change without notice
Doc No. 3026, Rev. B