发明名称 |
Dual rail power supply sequence tolerant off-chip driver |
摘要 |
The protection circuit of the present invention addresses the problem of indeterminate logic levels caused by loss of one of the power supplies in a two-power-supply CMOS integrated circuit. The circuit of the present invention replaces the typical scheme of power supply sequencing to fix the problem. The circuit disclosed herein detects the state of the core voltage and disables the output drivers when the core voltage is detected as being off. The disabled drivers are put into a high impedance state, thereby eliminating the potential for damage and eliminating the need for power supply sequencing. The invention also protects against the sudden loss of the integrated circuit core voltage, VDD, power supply during normal operation.
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申请公布号 |
US6570401(B2) |
申请公布日期 |
2003.05.27 |
申请号 |
US20010758054 |
申请日期 |
2001.01.10 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
CORREALE, JR. ANTHONY;COUGHLIN, JR. TERRY CAIN;STOUT DOUGLAS WILLARD |
分类号 |
H03K19/003;(IPC1-7):H03K19/007;H03K19/094 |
主分类号 |
H03K19/003 |
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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