The MC74LCX257 is a high performance, quad 2-input multiplexer with 3-state outputs operating from a 2.3 to 3.6V supply. High impedanceTTL compatible inputs significantly reduce current loading to input drivers while TTL compatible outputs offer improved switching noise performance. A V
specification of 5.5V allows MC74LCX257 inputs to be safely driven from 5.0V devices.
Four bits of data from two sources can be selected using the Select input. The four outputs present the selected data in the true(non-inverted) form. The outputs may be switched to a high impedance state by placing a logic HIGH on the Output Enable (OEbar) input. Current drive capability is 24mA at the outputs.

• Designed for 2.3 to 3.6V V
• Operation
• 5V Tolerant - Interface Capability With 5V TTL Logic
• Supports Live Insertion and Withdrawal
• I
• Specification Guarantees High Impedance When V
• = 0V
• LVTTL Compatible
• LVCMOS Compatible
• 24mA Balanced Output Sink and Source Capability
• Near Zero Static Supply Current in All Three Logic States (10
• A)
• Substantially Reduces System Power Requirements
• Latchup Performance Exceeds 500mA
• ESD Performance:
• Human Body Model >2000V;
• Machine Model >200V
• Pb-Free Packages are Available*