发明名称 |
Voltage level sensing power-up reset circuit |
摘要 |
A power-up reset circuit for providing a reset signal for resetting circuit elements such as flip-flops upon the application of power to the circuit includes a CMOS pair output section and a capacitor coupled to the gates of the CMOS transistors. The capacitor is charged up by the power supply to switch the reset signal to a low level after the resetting operation has been achieved. In order to accommodate slow ramping power supplies, circuitry operating as a voltage sensitive switch is included to prevent the capacitor from charging until the power supply voltage has reached a sufficient level to ensure proper operation. In order to accommodate fast ramping power supplies, the charging rate of the capacitor is controlled to assure a minimum necessary duration of the reset signal.
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申请公布号 |
US4717840(A) |
申请公布日期 |
1988.01.05 |
申请号 |
US19860839501 |
申请日期 |
1986.03.14 |
申请人 |
WESTERN DIGITAL CORPORATION |
发明人 |
OUYANG, KENNETH W.;MARMET, MELVIN |
分类号 |
H03K17/22;(IPC1-7):H03K17/22 |
主分类号 |
H03K17/22 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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