pcf1252 NXP Semiconductors, pcf1252 Datasheet - Page 9

• Manufacturer Part Number: pcf1252
• Description: Threshold Detector And Reset Generato
• Manufacturer: NXP Semiconductors

Philips Semiconductors
1998 Apr 16
handbook, full pagewidth
handbook, full pagewidth
Threshold detector and reset generator
(1) For external reset application, the SELECT input must be debounced.
input signal (1)
external reset
Fig.11 Data retention circuit with external switchable reset for systems with a single voltage supply.
V SS
V DD
6 M
1 M
12 V
COMIN
SELECT
Fig.10 Data retention circuit for memory back-up systems.
V SS
COMIN
SELECT
REGULATOR
PCF1252-X
V SS
PCF1252-X
VOLTAGE
V DD
CT
COMOUT
RESET
V DD
CT
5 V
RESET
POWF
1 nF
MGC924
10
F
10
RESET
INT
9
F
RESET
INT
V DD
V SS
DECODING
LOGIC
CHIP-
V DD
V SS
MICROCONTROLLER/
MICROPROCESSOR
MICROCONTROLLER/
MICROPROCESSOR
R/W
C S
RAM
addres/data bus
V DD
V SS
PCF1252-X family
V RAM
V DD
RAM
V SS
Product specification
MGC925