CD54HC251 - Texas Instruments

CD54HC251 8-Input Multiplexer

The ’HC251 and ’HCT251 are 8-channel digital multiplexers with three-state outputs, fabricated with high-speed silicongate CMOS technology. Together with the low power consumption of standard CMOS integrated circuits, they possess the ability to drive 10 LSTTL loads. The three-state feature makes them ideally suited for interfacing with bus lines in a busor.

Features

• Selects one of eight binary data inputs
• Three-state output capability
• True and complement outputs
• Typical (data to output) propagation delay of 14 ns at VCC = 5 V, CL = 15 pF, TA = 25 ℃
• Fanout (over temperature range)
  – Standard outputs : 10 LSTTL loads
  – Bus driver outputs : 15 LSTTL loads
• Wide operating temperature range :
  – 55 ℃ to 125 ℃
• Balanced propagation delay and transition times
• Significant power reduction compared to LSTTL logic ICs
• Alternate source is Philips
• HC types
  – 2 V to 6 V operation
  – High noise immunity : NIL = 30 %, NIH = 30% of VCC at VCC = 5 V
• HCT t.