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General-Purpose Driver Circuit

IP.com Disclosure Number: IPCOM000047851D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-08

Publishing Venue

IBM

Related People

Authors:
Scarpero, WJ Waggoner, CD Zuckerman, A [+details]

Abstract

The circuit shown in Fig. 1 makes it possible for the SCS (Schottky current switch) technology to interface with low voltage swing-type drivers. The circuit is comprised of a predriver and a driver. The predriver is an SCS internal circuit wired in a driver cell. When the input A or B is Up, the output of the driver is Up, transistor T8 is conducting, thus clamping the collector of T8 to about 0.2 V above ground. When the input A or B goes Down, transistor T4 turns on, thus resulting in the driver output starting to go Down. Schottky SBD1 acts as a current bleeder limiting the base current into transistor T7. This current bleeder allows control of the Down-going transistor dv/dt to be adjustable. As the output of the driver falls, transistor T7 turns on and transistor T8 turns off.