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Push-Pull Driver With Voltage Regulator

IP.com Disclosure Number: IPCOM000036072D
Original Publication Date: 1989-Sep-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Fang, ED: AUTHOR [+6]

Abstract

The push-pull driver circuit described in this article incorporates a very tight tolerance transistor clamp to a regulated voltage to effectively clamp the driver output voltage from rising above the regulated voltage brought into the circuit. This results in a very tight up level and assures incident switching of receivers for almost all net types.

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Push-Pull Driver With Voltage Regulator

The push-pull driver circuit described in this article incorporates a very tight tolerance transistor clamp to a regulated voltage to effectively clamp the driver output voltage from rising above the regulated voltage brought into the circuit. This results in a very tight up level and assures incident switching of receivers for almost all net types.

The driver circuit shown in Fig. 1 operates with a 5.0 volt +/10% DC supply source Vcc, and is designed to receive VTL levels at the input node IN and to convert same to '1' and '0' logic levels at the output node OUT, where a logical '1' = 2.331 V at 3.5 ma and a logical '0' = 0.49 V at 16.0 ma. The incident switching function is assured on a given network by minimizing the difference between the most positive up level (MPUL) and the least positive up level (LPUL) at the driver output. The amplitude of a pedestal on a falling transition is dependent on the DC starting up level. For a given LPUL, the maximum amplitude of the falling pedestal is decreased by limiting the associated MPUL.

(Image Omitted)

The voltage regulator circuit [*] shown in Fig. 2, is used to achieve the regulated output voltage VR of the Fig. 1 driver circuit in the logical '1' level. By this means, the output voltage of the driver circuit shown will vary only from 2.31 to 2.79 volts over a temperature range of 10 to 100 degrees C, a power supply variation from 4.5 to 5.5 volts, a ground shift from -.015 to +.125 volts and load currents (driver) fr...