Browse Prior Art Database

Unique DASD Flex Cable

IP.com Disclosure Number: IPCOM000037777D
Original Publication Date: 1989-Jun-01
Included in the Prior Art Database: 2005-Jan-30

Publishing Venue

IBM

Related People

Authors:
Bickford, HR Guenther, CJ Heinzelmann, AJ Horton, RR Kovac, PA Moskowitz, PA Noyan, IC Palmer, MJ Poore, PA [+details]

Abstract

The goal for high-volume DASD access cables is to improve machine performance and lower costs. Present practice calls for mounting servo and data chips enclosed in plastic packages or TAB packages onto the cables by means of standard surface mount techniques. The problem posed is to find a method to attach the chips directly to flex and to discover a cable format that makes direct chip attach manufacturing possible. Direct attach reduces the length of interconnections which in turn lowers inductance and electrical resistance, as well as reducing thermal resistance. One difficulty which must be overcome is that of the thermal mismatch between the chip and the substrate. The solution must be low cost for low-end applications.