Browse Prior Art Database

Voter Synchronized Multivibrators

IP.com Disclosure Number: IPCOM000095637D
Original Publication Date: 1964-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Dieffenderfer, JW: AUTHOR [+2]

Abstract

Certain types of data processing equipment, particularly those utilizing redundant construction to improve reliability, require synchronization of two or more bistable multivibrators. That is, control is effected so that when such multivibrators are actuated by the same signal they concurrently reside in the same states.

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Voter Synchronized Multivibrators

Certain types of data processing equipment, particularly those utilizing redundant construction to improve reliability, require synchronization of two or more bistable multivibrators. That is, control is effected so that when such multivibrators are actuated by the same signal they concurrently reside in the same states.

A single multivibrator A is illustrated with associated apparatus for synchronization with two other multivibrators 13 and C, not shown. The multivibrator A consists of two latches 10 and 11 constructed of And-Or-Invert logic elements. Multivibrators B and C are assumed to be of identical construction. The latches are interconnected via a pair of voters 12 and 13. A voter is a circuit that provides an up-level output when the majority of its input lines is in the up condition. The voters of each bistable multivibrator receive as inputs the signals A, 13 and C and A, 13 and C. The bar is used to designate the second of the two outputs for a given bistable.

As an initial consideration, it should be noted that upon application of power at least two of the bistables must reside in the same logic state, since only two possible states are available to each bistable. Assuming A to be out of synchronism with B and C which are synchronized with each other, voters 12 and 13 of A act to hold the present state of A upon energization by the next master clock pulse and maintain this state for one-half cycle. At the end of the...