HD74BC645A Datasheet | Hitachi Semiconductor

Description The HD74BC645A 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 eight bus transceivers with three state outputs in a 20 pin package. Each device has an active low enable input ( G ) and a direction control input, Di R. When Di R is high, data flows from the A inputs to the B outputs. When Di R is high, data flows from the B inputs to the A outputs. When enable inputs (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. Input pins can be open, when not used, owing to built in input pull up circuit. Input is TTL level. Wide operating temperature range Ta = - 40 to +85°C. Function Table Control Inputs G L L H H L X Z : : : : High level Low level Immaterial High impedance DIR L H X Operation B data to A bus A data to B bus Z 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 +5.5 - 65 to +150 Unit V m A V V V °C 1. The absolute maximum ratings are values which must not individually be exceeded, and furthermore, no two of which may be realized at the same time. Remended Operating Conditions Item Supply voltage Input voltage Ouput voltage Operating temperature Input rise/fall time- Note: Symbol VCC VIN VOUT Topr t r, t f Min 4.5 0 0 - 40 0 Typ 5.0 - - - - Max 5.5 VCC VCC 85 8 Unit V V V °C ns/V 1. This item guarantees maximum limit when one input switches. Waveform: Refer to test...