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Description
Decoder/Demultiplexer
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The parameters and performance indicators of this product are sourced from the internet. In case of discrepancies, please refer to the manufacturer's technical specifications!！
| Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Supply Voltage | VCC | Operating | 4.75 | 5.0 | 5.25 | V |
| Input Voltage (High) | VIH | IIH = 20 μA | 2.0 | - | 5.5 | V |
| Input Voltage (Low) | VIL | IIL = -0.4 mA | 0.0 | - | 0.8 | V |
| Output Voltage (High) | VOH | IOH = -0.4 mA | 2.4 | - | 5.0 | V |
| Output Voltage (Low) | VOL | IOL = 16 mA | 0.0 | - | 0.5 | V |
| Propagation Delay Time | tpd | VCC = 5V, TA = 25°C | - | 22 | - | ns |
| Power Dissipation | PD | Maximum | - | - | 100 | mW |
Pin Configuration:
Operation:
Power Supply:
Addressing Outputs:
Chip Select and Enable:
Propagation Delay:
Power Dissipation:
Handling:
General Description
These Schottky-clamped circuits are designed to be used in high-performance memory-decoding or data-routing applications,requiring very short propagation delay times. In high-performance memory systems these decoders can be used to minimize the effects of system decoding. When used with high-speed memories,the delay times of these decoders are usually less than the typical access time of the memory. This means that the effective system delay introduced by the decoder is negligible.
The DM74LS138 decodes one-of-eight lines,based upon the conditions at the three binary select inputs and the three enable inputs. Two active-low and one active-high enable inputs reduce the need for external gates or inverters when expanding. A 24-line decoder can be implemented with no external inverters, and a 32-line decoder requires only one inverter. An enable input can be used as a data input for demultiplexing applications.
The DM74LS139 comprises two separate two-line-to-four-line decoders in a single package. The active-low enable input can be used as a data line in demultiplexing applications.
All of these decoders/demultiplexers feature fully buffered inputs, presenting only one normalized load to its driving circuit. All inputs are clamped with high-performance Schottky diodes to suppress line-ringing and simplify system design.
Features
● Designed specifically for high speed:
Memory decoders
Data transmission systems
● DM74LS138 3-to-8-line decoders incorporates 3 enable inputs to simplify cascading and/or data reception
● DM74LS139 contains two fully independent 2-to-4-line decoders/demultiplexers
● Schottky clamped for high performance
● Typical propagation delay (3 levels of logic)
DM74LS13821 ns
DM74LS139 21 ns
● Typical power dissipation
DM74LS13832 mW
DM74LS139 34 mW
Preview of the first 3 pages of the data sheet
| QUANTITY | UNIT PRICE | PLUS UNIT PRICE | TOTAL PRICE |
|---|---|---|---|
| ≥1: | US $0.69250 | US $0.62325 | US $0.62325 |
| ≥5: | US $0.55400 | US $0.49860 | US $2.49300 |
| ≥10: | US $0.31855 | US $0.28669 | US $2.86690 |
| ≥20: | US $0.27700 | US $0.24930 | US $4.98600 |
| ≥50: | US $0.24930 | US $0.22437 | US $11.21850 |
| ≥100: | US $0.24238 | US $0.21814 | US $21.81400 |
| ≥200: | US $0.23545 | US $0.21190 | US $42.38000 |
| ≥500: | US $0.22852 | US $0.20567 | US $102.83500 |
| ≥1000: | US $0.22160 | US $0.19944 | US $199.44000 |
Substitute (equivalent) Product
| Product Name | Description |
|---|---|
| DM74LS138N | 3-Line to 8-Line Decoder/Demultiplexer, 24-Pin PDIP, TTL Logic |
| SN74LS138N | 3-Line to 8-Line Decoder/Demultiplexer, 24-Pin PDIP, TTL Logic |
| MC14028B | 3-Line to 8-Line Decoder/Demultiplexer, 16-Pin DIP, CMOS Logic |
| CD4514BE | 4-Line to 16-Line Decoder/Demultiplexer, 24-Pin PDIP, CMOS Logic |
| HEF4514BP | 4-Line to 16-Line Decoder/Demultiplexer, 24-Pin PDIP, CMOS Logic |
Product Usage
The DM74LS138N is a 3-line to 8-line decoder/demultiplexer, which is a common digital logic integrated circuit (IC). It is widely used in various digital circuits and systems where signal decoding or demultiplexing is required. Here are some specific applications and circuits where the DM74LS138N might be used:
Memory Address Decoding:
Peripheral Selection:
Multiplexed Bus Systems:
LED Display Control:
Segment Control in Digital Displays:
Test Equipment:
Data Acquisition Systems:
Microcontroller I/O Expansion:
Multiplexer/Demultiplexer Circuits:
Control Logic in Industrial Systems:
These are just a few examples of the many applications where the DM74LS138N can be found. Its versatility in decoding and demultiplexing makes it a valuable component in a wide range of digital circuits and systems.
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DM74LS138N
DM74LS138N has several brands around the world that may have alternate names for DM74LS138N due to regional differences or acquisition. DM74LS138N may also be known as the following names:
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