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參數(shù)資料
| 型號(hào)： | SA56614-47 |
| 廠(chǎng)商： | NXP Semiconductors N.V. |
| 英文描述： | CMOS system reset |
| 中文描述： | CMOS系統(tǒng)復(fù)位 |
| 文件頁(yè)數(shù)： | 9/14頁(yè) |
| 文件大?。?/td> | 112K |
| 代理商： | SA56614-47 |
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Philips Semiconductors
Product data
SA56614-XX
CMOS system reset
2001 Jun 19
9
APPLICATION INFORMATION
SL01355
SA56614-XX
V
DD
GND
V
DD
V
SS
V
OUT
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 V
DD
sources are employed. Figure 15 shows
how this may occur.
SL01356
SA56614-XX
OUTPUT
R
12
R
11
V
SUPPLY
A
V
DD
V
SS
CURRENT CHANGES
Figure 15. High impedance supply operating problems
Significant voltage variations of V
DD
may occur when the device is
operated from high impedance power sources. When the device
asserts or releases a reset, V
DD
variations are produced as a result
of the voltage drop developed across R
11
due to the current
variations through the resistor R
11
(representing the supply
impedance). If the V
DD
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 V
DD
sources to prevent such situations.
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