ne56631-xx NXP Semiconductors, ne56631-xx Datasheet - Page 8

• Manufacturer Part Number: ne56631-xx
• Description: Active-low System Reset
• Manufacturer: NXP Semiconductors

Philips Semiconductors
APPLICATION INFORMATION
The Power ON Reset Circuit shown in Figure 12 is an example of
obtaining a stable reset condition upon power-up. If power supply
rises abruptly, the RESET may go “HIGH” momentarily when V
below the minimum operating voltage (0.85 V). To overcome this
undesirable response, a resistor in placed between positive supply,
V
circuit solution works reasonably well for power-up as long as the
2003 Oct 14
CC
Active-LOW system reset
and V
CC
pin and a capacitor from V
SUPPLY
SUPPLY
GND
GND
V
V
CC
CC
CC
Figure 11. Conventional reset application for NE56631-XX.
pin to ground. The RC
Figure 12. Power On Reset circuit for NE56631-XX.
R
NE56631-XX
V
V
CC
SS
D
V
CC
CC
NE56631-XX
V
is
SS
V
OUT
8
power supply voltage rises faster than the RC time constant. The
RC network provides the necessary reset delay to hold the
microprocessor in reset until its circuitry settles down and normal
operation begins. When the supply turns off, the diode provides a
path for the capacitor to discharge to more quickly assert logic LOW
reset.
R
PU
V
OUT
RESET
R
PU
CPU
SL01741
RESET
CPU
SL01742
NE56631-XX
Product data