Input buffer and input-output buffer in full compliance with IDD

Details Input buffer and input-output buffer in full compliance with IDD Input buffer and input-output buffer in full compliance with IDD

1998-10-23

2000-12-19

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Particular stable state circuit

327200, 327208, 327211, 327212, H03K 302

Patent

active

061631884

ABSTRACT:
An input buffer and an input-output buffer in full compliance with IDDQ testability are provided, which use a signal fed back to a P-type or N-type controllable switch to turn on or turn off the switch so as to obtain a desired resistance by using an equivalent circuit for the buffer. The problem of reduced operating speed due to the use of a high-impedance resistor is then avoided. Hence, the IDDQ testing results will not be affected by using the input buffer or the input-output buffer, no matter the circuit is operated in an output mode or input mode. Furthermore, the input signal, either in the low state or in the high state, has no effect on the IDDQ testing results either.

REFERENCES:
patent: 4223524 (1980-09-01), Nakagawa
patent: 4704587 (1987-11-01), Ouyang et al.
patent: 5225724 (1993-07-01), Scarra' et al.
patent: 5440263 (1995-08-01), Fournel et al.
patent: 5602495 (1997-02-01), Lou
patent: 5786734 (1998-06-01), Park

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