1 Features
• ’AC257, ’ACT257…………. non-inverting outputs
• CD74ACT258 ………………. inverting outputs
• Buffered inputs
• Typical propagation delay
– 4.4ns at V CC = 5V, T A = 25°C, C L = 50pF
• Exceeds 2kV ESD protection MIL-STD-883,
method 3015
• SCR-latchup-resistant CMOS process and circuit
design
• Speed of bipolar FAST™/AS/S with significantly
reduced power consumption
• Balanced Propagation Delays
• AC types feature 1.5V to 5.5V operation and
balanced noise immunity at 30% of the supply
• ±24mA output drive current
– Fanout to 15 FAST™ ICs
• Drives 50Ω transmission lines

2 Description
The ’AC257, ’ACT257 and CD74ACT258 are quad 2-
input multiplexers with three-state outputs that utilize
Advanced CMOS Logic technology.