(PDF) HD74HCT449 Datasheet - Quad. Bus Transceivers with Individual Direction Controls

Número de pieza	HD74HCT449
Descripción	Quad. Bus Transceivers with Individual Direction Controls
Fabricantes	Hitachi Semiconductor
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No Preview Available ! HD74HCT449 Quad. Bus Transceivers with Individual Direction Controls Description 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. Features • LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility • High Speed Operation: tpd (A to B) = 12.5 ns typ (CL = 50 pF) • High Output Current: Fanout of 15 LSTTL Loads • Wide Operating Voltage: VCC = 4.5 to 5.5 V • Low Input Current: 1 µA max • Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) Function Table Enable GBA H X L X H H : High Level L : Low Level X : Irrelevant. GAB H L X H X Direction DIR X H L H L Operation Isolation A data to B bus B data to A bus Isolation Isolation 1 page 19.20 20.00 Max 16 9 1 1.3 1.11 Max 8 Unit: mm 7.62 2.54 ± 0.25 0.48 ± 0.10 0.25 + – 0.13 0.05 0° – 15° Hitachi Code JEDEC EIAJ Weight (reference value) DP-16 Conforms Conforms 1.07 g 5 Page

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PDF HD74HCT449 Data sheet ( Hoja de datos )