HD74BC245A

HD74BC245A Octal Bus Transceivers With 3 State Outputs ADE-205-008A (Z) Rev. 1 March 1993 Description The HD74BC245A provides high drivability and operation equal to or better than high speed bipolar standard logic IC by using Bi-CMOS process. The device features low power dissipation that is about 1/5 of high speed bipolar logic IC, when the frequency is 10 MHz. The device has ten buffers with three state outputs in a 20 pin package. Each device has an active low enable input G and a direction control input DiR. When DiR is high, data flows from the A inputs to the B outputs. When DiR is low, data flows from the B inputs to the A outputs. When G is high, disables both A and B ports by placing then in a high impedance. Features Input/Output are at high impedance state when power supply is off. Built in input pull up circuit can make input pins be open, when not used. TTL level input Wide operating temperature range Ta = –40 to + 85°C Function Table Control Inputs G L L H H : L : Z : High level Low level High impedance DiR L H X Operation B data to A bus A data to B bus Z HD74BC245A Pin Arrangement DiR A1 A2 A3 A4 A5 A6 A7 A8 GND 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VCC G B1 B2 B3 B4 B5 B6 B7 B8 (Top view) Absolute Maximum Ratings Item Supply voltage Input diode current Input voltage Output voltage Off state output voltage Storage temperature Note: Symbol VCC I IK VIN VOUT VOUT(off) Tstg Rating –0.5 to +7.0 ±30 –0.5 to +7.5 –0.5 to +7.5 –0.5 to ...