Non-volatile decade counter using Johnson code or equivalent

Details Non-volatile decade counter using Johnson code or equivalent Non-volatile decade counter using Johnson code or equivalent

1982-09-29

1985-04-16

Miller, Stanley D.

Electrical pulse counters, pulse dividers, or shift registers: c

Systems

Using particular code or particular counting sequence

307272A, 307279, 377 32, 377109, 377117, 377121, H03K 2308, H03K 2500

Patent

active

045120293

ABSTRACT:
This invention concerns counters.
More specifically, it relates to a non-volatile counting decade, comprising five flipflops, the outputs of which represent the decimal contents of the decade in the Johnson code. In this code, no flipflop changes its state more than twice in the course of a counting cycle from 0 to 10. The state of the counter is safeguarded on every incrementation, in separate safeguard circuits for each flipflop, formed of MNOS or floating-base transistors. However, any flipflop output state is safeguarded only if its state has changed after incrementation, this being detected by a logic circuit, which selects the safeguard signal for each flipflop.
By means of an extremely simple combinative circuit, this invention thereby greatly reduces the number of writing cycles to be performed by the MNOS or floating-base transistors, which cannot withstand an excessive number of writing cycles.

REFERENCES:
patent: 3530284 (1970-09-01), Wood
patent: 3911330 (1975-10-01), Fletcher et al.
patent: 4049951 (1977-09-01), Baty et al.
patent: 4175290 (1979-11-01), Harari
patent: 4224506 (1980-09-01), Coppola et al.
patent: 4228346 (1980-10-01), Barker

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