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Browse Prior Art Database

HIGH SPEED TTL TO CIRCUIT DRIVE CIRCUIT

IP.com Disclosure Number: IPCOM000005430D
Original Publication Date: 1980-Aug-01
Included in the Prior Art Database: 2001-Oct-10
Document File: 1 page(s) / 32K

Publishing Venue

Motorola

Related People

Gregory Smith: AUTHOR

Abstract

In many circuits, the critical timing of the logic lays primarily in one edge. The drawing illustrates a circuit that sinks a current from a load during aITL low input and removes the current very rapidly during a positive edge. The speed is contributed to: (1) Thediffusion capacitance of the input pnp translates the input edge instantaneously.

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f#$ MOTOROLA Technical Disclosure Bulletin Vol. 1 No. 1 August 1960

HIGH SPEED TTLTO CIRCUIT DRIVE CIRCUIT By Gregory Smith

   In many circuits, the critical timing of the logic lays primarily in one edge. The drawing illustrates a circuit that sinks a current from a load during aITL low input and removes the current very rapidly during a positive edge. The speed is contributed to:

(1) Thediffusion capacitance of the input pnp translates the input edge instantaneously.

(2) The diffusion pair signal is translated through pull-up diodes.

(3) The current output mode is actively pulled up by an emitter follower.

The circuit was used in the logic enable pin of a DAC which drove a string of switches as a load.

%, Motorola, Inc. 1980 36

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