Features: • Buffered Inputs• Typical Propagation Delay - 5.4ns at VCC = 5V, TA = 25oC, CL = 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 P...
CD74ACT139: Features: • Buffered Inputs• Typical Propagation Delay - 5.4ns at VCC = 5V, TA = 25oC, CL = 50pF• Exceeds 2kV ESD Protection MIL-STD-883, Method 3015• SCR-Latchup-Resistant C...
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The CD74AC139 and CD74ACT139 are dual 2-to-4-line decoders/demultiplexers that utilize the Harris Advanced CMOS Logic technology. CD74ACT139 contain two independent binary to one-of-four decoders, each with a single active LOW enable input (1E or 2E). Data on the select inputs (1A0 and 1A1 or 2A0 and 2A1) cause one of the four normally HIGH outputs to go LOW.
If the enable input is HIGH, all four outputs remain HIGH. For CD74ACT139 demultiplexer operation, the enable input is the data input.
The enable input also functions as a chip select when these devices are cascaded.