HD74HCT449 controls equivalent, quad. bus transceivers with individual direction controls.
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* LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility High Speed Operation: tpd (A to B) = 12.5 ns typ (CL = 50 .
The HD74HCT449 has 4 bus transceivers. The device has direction control inputs with individual. And this control inputs select data transmissible direction. When GBA is high, A outputs are disable, and when GAB is high, B outputs are disable.
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