Electronic digital logic circuitry – Tri-state – With field-effect transistor
Patent
1997-05-09
1999-01-26
Tokar, Michael J.
Electronic digital logic circuitry
Tri-state
With field-effect transistor
326 57, 326 83, 326 86, 326 27, 327215, 327219, 327333, H03K 190944
Patent
active
058642447
ABSTRACT:
A first output buffer circuit with independent transparent latch and tristate output capabilities includes input translators that directly drive a pair of main pull-up and pull-down output transistors. The input translators are tristatable in response to latch control signals and latching elements on side branches of the signal paths leading from the translator outputs to the output transistor gates hold the last voltage value on those signal paths at the time the translators are disabled. The main current paths through the output transistors include isolation transistors in series with the output transistors and responsive to feedback control from the buffer output. These feedback paths include logic gates responsive to output enable control signals that can shut off isolation transistors and hence put the buffer output in a high impedance state. Since neither the latch or output enable control, nor the latch elements themselves, are signal delaying components in the main signal path from the buffer input to the buffer output, throughput speed is not adversely affected.
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Duong Qui Van
Protsik Mark
Schneck Thomas
Tokar Michael J.
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