TTL/CMOS compatible input buffer with Schmitt trigger

Details TTL/CMOS compatible input buffer with Schmitt trigger TTL/CMOS compatible input buffer with Schmitt trigger

1990-11-08

1994-12-20

Zazworsky, John

Electronic digital logic circuitry

Interface

Logic level shifting

327206, H03K 19094, H03K 190175, H03K 3356

Patent

active

RE0348082

ABSTRACT:
A TTL/CMOS compatible input buffer circuit comprises a Schmitt trigger input buffer stage and a reference voltage generator. In the TTL mode, the reference voltage generator supplies a reference voltage having a level that forces the trigger point of the Schmitt trigger to a predetermined value. In the CMOS mode, the reference voltage generator is disabled and a voltage equal to the power supply voltage is provided to the Schmitt trigger. The input buffer circuit affords an enhanced input noise margin and minimizes DC power loss.

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