Input buffer utilizing a cascode to provide a zero power TTL to

Details Input buffer utilizing a cascode to provide a zero power TTL to Input buffer utilizing a cascode to provide a zero power TTL to

1993-03-19

1995-04-11

Hudspeth, David R.

Electronic digital logic circuitry

Interface

Logic level shifting

326121, 326 45, H03K 1710

Patent

active

054061393

ABSTRACT:
An input buffer for utilization in a programmable logic device (PLD). The input buffer includes an inverter consisting of a PMOS pull up transistor one half the size of a corresponding NMOS pull down transistor to enable TTL compatibility. To drive a high capacitance load, instead of utilizing further buffering which introduces gate delays, a cascode transistor is used to control an additional pull up output driver connected to the output of the inverter. The cascode functions to turn on the additional pull up output driver to supplement the PMOS pull up transistor during a low to high transition of the output. The input buffer further includes a switching transistor coupled between a V.sub.DD power supply and the PMOS pull up transistor to cut power to the PMOS pull up transistor when the inverter has a low output. With no utilization of power during a low output, the input buffer provides a zero power TTL input enabling the input buffer to be utilized on circuitry in battery powered devices.

REFERENCES:
patent: 4593212 (1986-06-01), Svager
patent: 4672243 (1987-06-01), Kirsch
patent: 4791323 (1988-12-01), Austin
patent: 4825106 (1989-04-01), Tipon et al.
patent: 5144167 (1992-09-01), McClintock
patent: 5151622 (1992-09-01), Thrower et al.
"An 11000-Fuse Electrically Erasable Programmable Logic Device (EEPLD) With An Extended Macrocell, " S. E. Wahlstrom, et al., IEEE Journal of Solid-State Circuits, vol. 23, No. 4, Aug. 1988, New York, N.Y. pp. 916-922.

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