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參數(shù)資料
| 型號： | 935269177115 |
| 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： | PLASTIC, SOT-23, SO-5 |
| 文件頁數(shù)： | 12/12頁 |
| 文件大小： | 138K |
| 代理商： | 935269177115 |
Philips Semiconductors
Product data
SA56606-XX
CMOS system reset
2001 Jun 19
9
Application information
SL01371
SA56606-XX
VDD
SUPPLY
GND
VDD
VSS
VOUT
RESET
CPU
RPU
Figure 14. Conventional reset application.
The Power ON Reset Circuit shown in Figure 15 is an example of
how to obtain a stable reset condition upon power-up. If the power
supply voltage rises abruptly, the RESET may go HIGH momentarily
when VDD is below the minimum operating voltage (0.95 V). To
overcome this, a resistor (R) is placed between positive supply and
the VDD pin with a capacitor from the VDD pin to ground.
SL01372
SA56606-XX
VDD
SUPPLY
GND
VDD
VSS
VOUT
RESET
CPU
RPU
D
C
R
Figure 15. Power ON reset circuit.
SL01373
SA56606-XX
OUTPUT
R12
R11
VSUPPLY
A
VDD
VSS
CURRENT CHANGES
RPU
Figure 16. High impedance supply operating problems.
Significant voltage variations of VDD may occur when the device is
operated from high impedance power sources. When the device
asserts or releases a reset, VDD variations are produced as a result
of the voltage drop developed across R11 due to the current
variations through the resistor R11 (representing the supply
impedance). If the VDD variations are large, such that they exceed
the Detection Hysteresis, the output of the device can oscillate from
a HIGH state to a LOW state. The user should avoid using high
impedance VDD sources to prevent such situations.
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