MC74VHCT257ADTG ON Semiconductor

MC74VHCT257A Quad 2-Channel Multiplexer with 3-State Outputs The MC74VHCT257A is an advanced high speed CMOS quad 2channel multiplexer fabricated with silicon gate CMOS technology. It achieves high speed operation similar to equivalent Bipolar MC74VHCT257A 15 V S 1 16 CC OE EN 1 S G1 A0 2 15 OE 2 B0 A3 MUX 3 14 A0 1 4 Y0 3 1 B0 Y0 B3 4 13 5 A1 7 Y1 6 A1 Y3 5 12 B1 11 A2 9 6 11 A2 B1 Y2 10 B2 B2 14 Y1 7 10 A3 12 Y3 13 Y2 B3 GND 8 9 Figure 1. Pin Assignment Figure 2. IEC Logic Symbol OE I I I I I I I I S 0a 1a 0b 1b 0c 1c 0d 1d This device contains protection circuitry to guard against damage due to high static voltages or electric fields. However, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this highimpedance cir- cuit. For proper operation, V and in V should be constrained to the out range GND (V or V ) V . in out CC Unused inputs must always be tied to an appropriate logic voltage Z Z Z Z a b c d level (e.g., either GND or V ). CC Unused outputs must be left open. Figure 3. Expanded Logic Diagram