Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Direction Switch for Tristate Driver

IP.com Disclosure Number: IPCOM000041559D
Original Publication Date: 1984-Feb-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Favata, AF: AUTHOR [+3]

Abstract

The disclosed switch circuit is utilized either to select or disable/ enable driver circuits (not shown). The circuit will pick either the right or left driver (not shown) by the logical operation of output L or R, as illustrated in the figure. The control is via the R/L (select) input. The enable/disable control, input I, will affect both L and R. The circuit operation is as follows: When the select input R/L is up (+), T2 must conduct, causing output L to be down (-). All drivers (not shown) connected to output L will be active. When T2 conducts, T3 is off, and output R will be up (+). All drivers (not shown) connected to output R will be inactive. Thus, the left drivers have been selected for logical operation. When the select input is down (-), output L will be up (+) and output R will be down (-).

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Direction Switch for Tristate Driver

The disclosed switch circuit is utilized either to select or disable/ enable driver circuits (not shown). The circuit will pick either the right or left driver (not shown) by the logical operation of output L or R, as illustrated in the figure. The control is via the R/L (select) input. The enable/disable control, input I, will affect both L and R. The circuit operation is as follows: When the select input R/L is up (+), T2 must conduct, causing output L to be down (-). All drivers (not shown) connected to output L will be active. When T2 conducts, T3 is off, and output R will be up (+). All drivers (not shown) connected to output R will be inactive. Thus, the left drivers have been selected for logical operation. When the select input is down (- ), output L will be up (+) and output R will be down (-). This is because T2 and TL are off and T3/TR are conducting. Under this condition the right drivers (not shown) have been selected to be active. The enable/disable function is provided through the I input. When I is up (+), all drivers are disabled. This is because TI must conduct, causing D1 and D2 to conduct, and under these conditions TL and TR are off (independent of the state of the R/L input), causing outputs R and L to be up.

1

Page 2 of 2

2

[This page contains 3 pictures or other non-text objects]