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・ Bus transport in Ecuador
・ Bus transport in France
・ Bus transport in Queensland
・ Bus transport in Singapore
・ Bus transport in Szczecin
・ Bus transport in the United Kingdom
・ Bus trap
・ Bus turnout
・ Bus upgrade zone
・ Bus Vannin
・ Bus Verts du Calvados
・ Bus Whitehead
・ Bus Éireann
・ Bus Éireann Route 101
・ Bus, Pas-de-Calais
Bus-holder
・ Bus-la-Mésière
・ Bus-lès-Artois
・ Bus-Saint-Rémy
・ Bus-Tops
・ Bus4you
・ Busa
・ BUSA Basketball League
・ BUSA Football League
・ Busa language (Mande)
・ Busa language (Papuan)
・ Busa of Canosa di Puglia
・ Busaana Modern Academy
・ Busabos ng Palad
・ Busabout


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Bus-holder : ウィキペディア英語版
Bus-holder

A bus-holder (or Bus-keeper) is a weak latch circuit which holds last value on a tri-state bus.
The circuit is basically a delay element with the output connected back to the input through a relatively high impedance. This is usually achieved with two inverters connected back to back. The resistor drives the bus weakly; therefore other circuits can override the value of the bus when they are not in tri-state mode.
Bus-holders are used to prevent CMOS gate inputs from getting floating values when they are connected to tri-stated nets. Otherwise both transistors in the gate could get turned on, thus shorting the power supply and ground, which would destroy the CMOS gate. This is prevented by the bus-holder pulling the input to the last valid logic level (0 or 1) on the net. The circuit is usually placed in parallel with the tri-stated net.
==References==

* A. P. Godse, D. A. Godse. (''Digital Logic Design and Application'' ). Technical Publications, 2008. ISBN 978-81-8431-475-5.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Bus-holder」の詳細全文を読む



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