Description
74139 Dual Decoder-Demux IC
74139 is a dual 2-to-4 line decoder/demultiplexer integrated circuit (IC). It is a digital logic that can be used to convert a two-line binary input signal into one of four output signals. The 74139 IC has two active-low enable inputs, E1 and E2, and two data inputs, D1 and D2. When both enable inputs are high, the outputs are inactive (in a high-impedance state). When one of the enabled inputs is low, the corresponding data input is passed through to the outputs. The 74139 IC is commonly used in digital logic circuits and in applications where a binary input signal needs to be decoded into multiple output signals.
The 74HC39 counter circuits contain independent ripple carry counters and utilize advanced silicon-gate CMOS technology. The MM74HC393 contains two 4-bit ripples that have binary counters, which can be cascaded to create a single divide-by-256 counter. Each of the two 4-bit counters is incremented on the HIGH- to-LOW transition (negative edge) of the clock input, and each has an independent clear input. When clear is set to HIGH all four bits of each counter are set to a low level. This enables count truncation and allows the implementation of divide-by-N counter configurations.
Package Includes:
- 1 x 74139 Dual Decoder-Demux IC
Specifications:
| Typical operating frequency | 50 MHz |
| Typical propagation delay | 13 ns (Ck to QA) |
| Wide operating supply voltage range | 26VDC |
| Low input current | <1 µA |
| Low quiescent supply current | 80 µA maximum(74HC Series) |
| Fanout | 10 LS-TTL loads |
| Dimensions | 7x7x2mm |
| Weight | 2g |
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