HD74BC244A Datasheet | Hitachi Semiconductor

Description The HD74BC244A 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 inverter drivers with three state outputs in a 20 pin package. This device is a non inverting buffer and has two active low enables (1G and 2G). Each enable independently controls 4 buffers. 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 Inputs G H L L H L X Z : : : : High level Low level Immaterial High impedance A X H L Output Y Z H L Pin Arrangement 1G 1A1 2Y4 1A2 2Y3 1A3 2Y2 1A4 2Y1 GND 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VCC 2G 1Y1 2A4 1Y2 2A3 1Y3 2A2 1Y4 2A1 (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 Output 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 circuit of switching characteristics. Logic Diagram 1G 2G 1A1 2Y4 1A2 1Y1 2A4 1Y2 2Y3 1A3 2A3 1Y3 2A2 1Y4 2Y2...