參數(shù)資料
型號: 935270967115
廠商: NXP SEMICONDUCTORS
元件分類: 電源管理
英文描述: 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5
封裝: 1.50 MM, PLASTIC, MO-178, SOT-23, SO-5
文件頁數(shù): 14/15頁
文件大?。?/td> 197K
代理商: 935270967115
Philips Semiconductors
Product data
NE56631-XX
Active-LOW system reset
2003 Feb 14
8
APPLICATION INFORMATION
RESET
VCC
SUPPLY
GND
VCC
NE56631-XX
VSS
VOUT
RPU
CPU
SL01741
Figure 11. Conventional reset application for NE56631-XX.
RESET
VCC
SUPPLY
GND
VCC NE56631-XX
VSS
VOUT
RPU
CPU
SL01742
R
D
Figure 12. Power On Reset circuit for NE56631-XX.
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 VCC is
below the minimum operating voltage (0.85 V). To overcome this
undesirable response, a resistor in placed between positive supply,
VCC and VCC pin and a capacitor from VCC pin to ground. The RC
circuit solution works reasonably well for power-up as long as the
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.
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