High-voltage tolerant input buffer in low-voltage technology

Details High-voltage tolerant input buffer in low-voltage technology High-voltage tolerant input buffer in low-voltage technology

1997-03-14

1999-09-14

Santamauro, Jon

Electronic digital logic circuitry

Interface

Supply voltage level shifting

326 17, 326 83, H03K 190185, H03K 19017

Patent

active

059528486

ABSTRACT:
The input buffer of a low-voltage technology integrated circuit (IC) has a buffer transistor adapted to receive an input signal at the gate of the input buffer. The channel nodes of the input buffer are connected to other circuitry (e.g., the low-voltage bias voltage and a current source). With such an input buffer, the low-voltage circuit can safely receive a relatively high input voltage. As such, the low-voltage circuit can be interfaced to and safely operated in conjunction with relatively high-voltage technology circuitry. In one implementation, IC circuitry of existing 5V technology can be safely used with IC circuitry of a new 2.5V technology having an input buffer of the present invention.

REFERENCES:
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patent: 5432467 (1995-07-01), Reddy
patent: 5606268 (1997-02-01), Van Brunt
patent: 5670898 (1997-09-01), Fang
"Analog MOS Integrated Circuits for Signal Processing", by Roubik Gregorian and Gabor C. Temes, A Wiley-Interscience Publication, John Wiley & Sons, 1986, pp. 141-143.
"Fast Level Converter Circuit" by Anonymous, IBM Technical Disclosure Bulletin, New York, May 1987, vol. 29 No. 12, p. 5167.
"A Quarter-micron SIMOX-CMOS LVTTL-compatible Gate Array with an over 2,000 V ESB-protection circuit" by Yusuke Ohtomo, et al., Proceedings of the IEEE 1996 Custom Integrated Circuits Conference (CICC), San Diego, May 1996, pp. 57-60.

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