Microprocessor having a compensated input buffer circuit

Details Microprocessor having a compensated input buffer circuit Microprocessor having a compensated input buffer circuit

1996-02-16

1998-04-21

Santamauro, Jon

Electronic digital logic circuitry

Interface

Current driving

326 34, 326 50, 326 68, H03K 190185, H03K 190948

Patent

active

057421846

ABSTRACT:
An input buffer circuit provides programmable resistors for inputs to a microprocessor and compensates for switching voltage timing differences caused when a selected programmable resistor is utilized for a selected input. In a preferred embodiment, an input buffer circuit has a weak transistor coupled between the input and an operating voltage source or ground, and a compensation circuit including two transistors in series between the operating voltage source or ground, and an output. When the weak transistor is on, thereby raising or lowering the input signal, one of the transistors is also on and the other transistor couples the output to the operating voltage source or ground.

REFERENCES:
patent: 4908528 (1990-03-01), Huang
patent: 5220213 (1993-06-01), Woo
patent: 5465058 (1995-11-01), Krenik et al.
patent: 5477166 (1995-12-01), Matthews

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