发明名称 |
Interface circuit adaptive to high speed and low voltage operation |
摘要 |
An interface circuit for interfacing between an integrated circuit (IC) on a transmitting side and an IC on a receiving side over a line on a printed circuit board comprises an output circuit implemented in the IC on the transmitting side and composed of a current source for supplying a given current and a switching circuit for cutting off the given current according to a binary signal and delivering the given current as a current signal to the line, and an input circuit implemented in the IC on the receiving side and composed of a transimpedance circuit whose input impedance is equal to the one of the line and which converts the current signal into a voltage signal, and a comparator for identifying the voltage signal relative to a given threshold voltage and reproducing the binary signal. This circuitry makes it possible to provide an interface circuit that can be implemented in a CMOS IC during CMOS processing and operated at a low voltage. A threshold voltage for use in identifying a signal on the receiving side is stabilized, thus realizing an interface circuit unsusceptible to influence of a change in CMOS processing or the like.
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申请公布号 |
US5512853(A) |
申请公布日期 |
1996.04.30 |
申请号 |
US19940320068 |
申请日期 |
1994.10.07 |
申请人 |
FUJITSU LIMITED |
发明人 |
UENO, NORIO;MATSUYAMA, TORU |
分类号 |
G06F15/78;H03K19/0175;H03K19/0185;(IPC1-7):H03L5/00;H01L25/00;H03B1/00;H03K17/16 |
主分类号 |
G06F15/78 |
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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