Browse Prior Art Database

Method to Use a Programmed Array Logic As a Differential Receiver

IP.com Disclosure Number: IPCOM000039852D
Original Publication Date: 1987-Aug-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Buckland, PA: AUTHOR

Abstract

Many currently available differential receivers do not work well at certain interface frequencies. When an interface uses differential drivers and receivers on its serial data and clock signals and these differential signals run at 5 to 15 MHz, currently available receivers can distort the signals so much that the data is unreadable. The solution is to use a specially Programmed Array Logic (PAL) to act as a differential receiver. The PAL has very low signal distortion and can easily work at 15 MHz. The PAL is not a true differential receiver in that its input signals must be at TTL (transistor-transistor logic) levels. This is not a problem with an interface that specifies drivers which drive the signals to TTL levels.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 1

Method to Use a Programmed Array Logic As a Differential Receiver

Many currently available differential receivers do not work well at certain interface frequencies. When an interface uses differential drivers and receivers on its serial data and clock signals and these differential signals run at 5 to 15 MHz, currently available receivers can distort the signals so much that the data is unreadable. The solution is to use a specially Programmed Array Logic (PAL) to act as a differential receiver. The PAL has very low signal distortion and can easily work at 15 MHz. The PAL is not a true differential receiver in that its input signals must be at TTL (transistor-transistor logic) levels. This is not a problem with an interface that specifies drivers which drive the signals to TTL levels. The PAL also provides high noise immunity by latching the receiver state and requiring both inputs to switch to change the state. This is a new application for a PAL. The PAL is desirable because of its compact size and its tight delay tolerances inside the chip. * Trademark of Monolithic Memories Inc.

1