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MC74VHCT244A Octal Bus Buffer/Line Driver with 3-State Outputs The MC74VHCT244A is an advanced high speed CMOS octal bus buffer fabricated with silicon gate CMOS technology. It achieves high speed operation similar to equivalent Bipolar Schottky TTL while MC74VHCT244A 218 A1 YA1 4 16 A2 YA2 6 14 A3 YA3 8 12 A4 YA4 DATA NONINVERTING INPUTS OUTPUTS 11 9 B1 YB1 13 7 B2 YB2 15 5 B3 YB3 17 3 B4 YB4 1 OUTPUT OEA 19 ENABLES OEB Figure 1. Logic Diagram FUNCTION TABLE OEA 1 20 V CC Inputs Outputs A1 2 19 OEB YB4 3 18 YA1 OEA, OEB A, B YA, YB A2 4 17 B4 L L L L L L H H H H YB3 5 16 YA2 H X Z Z Z A3 6 15 B3 YB2 7 14 YA3 A4 8 13 B2 YB1 9 12 YA4 GND 10 11 B1 Figure 2. Pin Assignment
