MC74VHCT157AMG ON Semiconductor

MC74VHCT157A Quad 2-Channel Multiplexer The MC74VHCT157A is an advanced high speed CMOS quad 2channel multiplexer fabricated with silicon gate CMOS technology. It achieves high speed operation similar to equivalent Bipolar Schottky TTL while maintaining CMOS low power dissipation. It consists of four 2input digital multiplexers with common select MC74VHCT157A V S 1 16 CC A0 2 15 E B0 3 14 A3 Y0 4 13 B3 A1 5 12 Y3 6 11 A2 B1 B2 Y1 7 10 Y2 GND 8 9 Figure 1. Pin Assignment 2 A0 4 3 Y0 B0 5 A1 7 6 Y1 B1 NIBBLE DATA 11 INPUTS A2 OUTPUTS 9 10 Y2 B2 14 A3 12 13 Y3 B3 15 E 1 S Figure 2. Expanded Logic Diagram 15 E EN 1 S G1 This device contains protection circuitry to guard against damage due to high static 2 voltages or electric fields. However, pre- MUX A0 1 4 Y0 3 cautions must be taken to avoid applications B0 1 5 of any voltage higher than maximum rated A1 7 Y1 voltages to this highimpedance circuit. For 6 B1 proper operation, V and V should be in out 11 A2 9 constrained to the range GND (V or V ) in out Y2 10 B2 V . CC 14 Unused inputs must always be tied to an A3 12 Y3 13 appropriate logic voltage level (e.g., either B3 GND or V ). Unused outputs must be left CC open. Figure 3. IEC Logic Symbol