Browse Prior Art Database

Current-Limited Inverter Off-Chip Driver

IP.com Disclosure Number: IPCOM000047590D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Banker, DC: AUTHOR [+3]

Abstract

This off-chip driver accepts .5 to 1.1-volt levels from a logic circuit, known as a current-limited inverter (CLI), and produces high current off-chip drive at voltage levels of 0 to 2.6 volts. Shown in the drawing is an internal CLI logic circuit with its output connected to the CLI off-chip driver circuit. The .5 to 1.1-volt transition from the internal logic circuit is not large enough to provide adequate off-chip noise tolerance and must be increased through a voltage translation circuit which is part of the CLI off-chip driver. The translation is accomplished by connecting the collector of T3 through a load resistor to 3.4 volts while connecting Schottky diode anti-saturation clamp D2 to 1.1 volts. The collector of T3 connects to emitter follower off-chip driver T5.

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Current-Limited Inverter Off-Chip Driver

This off-chip driver accepts .5 to 1.1-volt levels from a logic circuit, known as a current-limited inverter (CLI), and produces high current off-chip drive at voltage levels of 0 to 2.6 volts. Shown in the drawing is an internal CLI logic circuit with its output connected to the CLI off-chip driver circuit. The .5 to 1.1-volt transition from the internal logic circuit is not large enough to provide adequate off-chip noise tolerance and must be increased through a voltage translation circuit which is part of the CLI off-chip driver. The translation is accomplished by connecting the collector of T3 through a load resistor to 3.4 volts while connecting Schottky diode anti-saturation clamp D2 to 1.1 volts. The collector of T3 connects to emitter follower off-chip driver T5.

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