Texas Instruments SN74HCS139DR, 74HCS series Decoder/Demultiplexer, 2 x 2:4 circuit, 16-SOIC surface mount, 2V to 6V single supply, -40°C to 125°C.
| Parameter | Value |
|---|---|
| Type | Decoder/Demultiplexer |
| Series | 74HCS |
| Mounting | Surface Mount |
| Supply voltage | 2V ~ 6V |
| Voltage supply source | Single Supply |
| Current - output high, low | 7.8mA, 7.8mA |
| Operating temperature | -40°C ~ 125°C |
| Circuit | 2 x 2:4 |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Case | 16-SOIC (0.154\", 3.90mm Width) |
| Independent circuits | 2 |
It takes two address inputs per decoder and asserts one of four active-low outputs, with an active-low enable per section. Two independent decoders live in the same 16-SOIC package, so a single chip handles two separate address decode or demultiplexing tasks — memory bank select, I/O expansion, or routing a data stream to one of four destinations.
Operates on a single 2V to 6V supply.
The SN74HCS139DR contains two independent 2:4 decoders in one package, each with its own enable. The SN74HCS138 is a single 3:8 decoder with three enable inputs. Choose the 139 when you need two separate decode blocks; pick the 138 for a single wider address decode.
Yes. The supply range of 2V to 6V covers 5V operation directly. Input thresholds are compatible with standard 5V CMOS and TTL logic levels when VCC is 5V.
It is a dual 2-line to 4-line decoder/demultiplexer used for memory address decoding, I/O port expansion, data routing to one of four outputs, and general-purpose combinational logic where two independent decode functions are needed in a single 16-SOIC package.