MC74VHC257DG ON Semiconductor

MC74VHC257 Quad 2-Channel Multiplexer with 3-State Outputs The MC74VHC257 is an advanced high speed CMOS quad 2channel multiplexer fabricated with silicon gate CMOS technology. It achieves high speed operation similar to equivalent Bipolar MC74VHC257 OE I I I I I I I I S 0a 1a 0b 1b 0c 1c 0d 1d Z Z Z Z a b c d Figure 2. Expanded Logic Diagram 15 OE EN 1 S G1 2 A0 MUX 1 4 Y0 3 B0 1 5 A1 7 Y1 6 B1 11 A2 9 Y2 10 B2 14 A3 12 Y3 13 B3 Figure 3. IEC Logic Symbol This device contains protection circuitry to guard against damage FUNCTION TABLE due to high static voltages or electric fields. However, precautions must Inputs Outputs be taken to avoid applications of any OE S Y0 Y3 voltage higher than maximum rated H X Z voltages to this highimpedance cir- L L A0A3 cuit. For proper operation, V and in L H B0B3 V should be constrained to the out range GND (V or V ) V . A0 A3, B0 B3 = the levels in out CC Unused inputs must always be of the respective DataWord tied to an appropriate logic voltage Inputs. level (e.g., either GND or V ). CC Unused outputs must be left open.