Features: • Multifunction Capability - Binary to 1 of 4 Decoders or 1 to 4 Line Demultiplexer• Active Low Mutually Exclusive Outputs• Fanout (Over Temperature Range) - Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads - Bus Driver Outputs . . . . . . . . . . . . . . ....
CD74HC139: Features: • Multifunction Capability - Binary to 1 of 4 Decoders or 1 to 4 Line Demultiplexer• Active Low Mutually Exclusive Outputs• Fanout (Over Temperature Range) - Standard Out...
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The 'HC139 and 'HCT139 devices 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 CD74HC139 demultiplexer operation the enable input is the data input. The enable input also functions as a chip select when CD74HC139 are cascaded. CD74HC139 is functionally the same as the CD4556B and is pin compatible with it.
The outputs of CD74HC139 can drive 10 low power Schottky TTL equivalent loads. The HCT logic family is functionally as well as pin equivalent to the LS logic family.