HD74HCT640 Datasheet | Hitachi Semiconductor

Description Both the HD74HCT640 and the HD74HCT643 have one active low enable input (G ), and a direction control (DIR). When the DIR input is high, data flows from the A inputs to the B outputs. When DIR is low, data flows from B to A. The HD74HCT640 transfers inverted data from one bus to the other. The HD74HCT643 transfers inverted data from the A bus to the B bus and non-inverted data from the B bus to the A bus. Features - - - - - - LSTTL Output Logic Level patibility as well as CMOS Output patibility High Speed Operation: tpd (A to B) = 14.5 ns typ (CL = 50 p F) 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 Control Input G L L H DIR L H X Operation HD74HCT640 B data to A bus A data to B bus Isolation HD74HCT643 B data to A bus A data to B bus Isolation HD74HCT640/HD74HCT643 Pin Arrangement DIR A1 A2 A3 A4 A5 A6 A7 A8 1 2 3 4 5 6 7 8 9 20 VCC 19 Enable G 18 B1 17 B2 16 B3 15 B4 14 B5 13 B6 12 B7 11 B8 (Top view) GND 10 HD74HCT640/HD74HCT643 HD74HCT643 DIR A1 A2 A3 A4 A5 A6 A7 A8 1 2 3 4 5 6 7 8 9 20 VCC 19 Enable G 18 B1 17 B2 16 B3 15 B4 14 B5 13 B6 12 B7 11 B8 (Top view) GND 10 Block Diagram G DIR VCC A B VCC To 7 other inverters To 7 other inverters HD74HCT640/HD74HCT643 HD74HCT643 G DIR VCC A B VCC To 7 other inverters To 7 other inverters Absolute Maximum Ratings Item Supply voltage range Input voltage Output voltage DC current drain per pin DC current drain per VCC, GND DC input diode current DC output diode current Power dissipation per package Storage temperature Symbol VCC VIN VOUT I OUT I CC, I GND I IK I OK PT Tstg Rating - 0.5 to +7.0 - 0.5 to VCC + 0.5 - 0.5 to VCC + 0.5 ±35 ±75 ±20 ±20 500 - 65 to +150 Unit V V V m A m A m A m A m W...