54LS140/74LS140 LSTTL 4 50Ω : tpd=12ns Pd=4.3mW/ : (1/2)
: :
A H L × × × H= B H × L × × L= C H × × L × D H × × × L ×= Y L H H H H
:
74Ⅱ Vcc VIH VIL IOH IOL TA
BDTIC
54 5.25 0.8 -40 24 4.5 2 0.7 -40 12 -55 125 5 5.5 V V V mA mA ℃
5 4.75 2
-40
85
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