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參數(shù)資料
| 型號： | 935269140115 |
| 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, SOT-23, SOT-25, SO-5 |
| 文件頁數(shù)： | 12/12頁 |
| 文件大?。?/td> | 122K |
| 代理商： | 935269140115 |
Philips Semiconductors
Product data
SA56614-XX
CMOS system reset
2002 Sep 13
9
APPLICATION INFORMATION
SL01355
SA56614-XX
VDD
GND
VDD
VSS
VOUT
RESET
CPU
Figure 14. Conventional reset application
Small changes in supply current will occur when the SA56614
asserts or releases a reset. In some cases this can cause
oscillations of the device. This can present a problem, particularly
where high impedance VDD sources are employed. Figure 15 shows
how this may occur.
SL01356
SA56614-XX
OUTPUT
R12
R11
VSUPPLY
A
VDD
VSS
CURRENT CHANGES
Figure 15. 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.
TEST CIRCUITS
SL01357
SA56614-XX
VDD
A
VDD
VSS
V
VOUT
Figure 16. Test Circuit 1
SL01358
SA56614-XX
VDD
VSS
V
VOUT
V
A
VDS
Figure 17. Test Circuit 2
SL01359
SA56614-XX
VDD
VSS
V
VOUT
V
A
VDS
Figure 18. Test Circuit 3
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