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IC 3-8 LINE DECODER/DEMUX 16-DIP
| Manufacturer : | TI |
|---|---|
| Package/Case : | DIP-16 |
| Product Categories : | Encoders,Decoders,Multiplexers & Demultiplexers |
| Datasheet: | SN74HC138N Datasheet (PDF) |
| RoHs Status: | Lead free / RoHS Compliant |
| Marking Code: | SN74HC138N |
| In-stock: | 0 |
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SN74HC138N Product Details
The SN74HC138N is a commonly used 3-to-8 line decoder/demultiplexer IC (integrated circuit). The SN74HC138N is part of the SN74HC series of logic ICs. It is specifically a 3-to-8 line decoder/demultiplexer. This means it takes a 3-bit binary input and selects one of eight possible outputs based on the binary input code. For more details about the circuit diagram, etc., check the SN74HC138N datasheet.
The SN74HC138N IC is specifically crafted for applications demanding swift propagation delay times, particularly in the realm of high-performance memory decoding and data routing. When integrated into high-performance memory systems, this decoder serves to mitigate the impact of system decoding. When combined with high-speed memories utilizing rapid enable circuits, the combined delay times of these decoders and the memory's enable duration typically fall below the memory's typical access time. Consequently, the decoders' contribution to the overall system delay becomes practically insignificant.
SN74HC138N Manufacturer
SN74HC138N is manufactured by TI, Texas Instruments Incorporated (TI) is a prominent American technology enterprise headquartered in Dallas, Texas. Its primary domain of expertise lies in the design and fabrication of semiconductors and a diverse array of integrated circuits. These products find their way into the hands of global electronics designers and manufacturers. Notably, TI ranks among the top 10 semiconductor companies globally, a testament to its substantial sales volume. The company's strategic focus predominantly revolves around the advancement of analog chips and embedded processors, collectively contributing to over 80% of its revenue. In addition to these core areas, TI is known for its innovations in TI digital light processing technology and educational products. This includes a range of offerings such as calculators, microcontrollers, and multi-core processors. Furthermore, TI boasts an impressive portfolio of 45,000 patents, underscoring its commitment to technological excellence, as of the year 2016.
SN74HC138N Pinout
Pin configuration
| Pin No. | Name | I/O | Description |
| 1 | A | I | Select input A (least significant bit) |
| 2 | B | I | Select input B |
| 3 | C | I | Select input C (most significant bit) |
| 4 | G 2A | I | Active low enable A |
| 5 | G 2B | I | Active low enable B |
| 6 | G1 | I | Active high enable |
| 7 | Y7 | O | Output 7 |
| 8 | GND | — | Ground |
| 9 | Y6 | O | Output 6 |
| 10 | Y5 | O | Output 5 |
| 11 | Y4 | O | Output 4 |
| 12 | Y3 | O | Output 3 |
| 13 | Y2 | O | Output 2 |
| 14 | Y1 | O | Output 1 |
| 15 | Y0 | O | Output 0 (least significant bit) |
| 16 | Vcc | — | Supply voltage |
Feature
High-Speed Memory Decoding:
The SN74HC138N is specifically designed for high-speed memory decoding applications. Its rapid switching times ensure efficient and precise decoding in memory and data-processing systems.
Wide Operating Voltage Range:
This decoder operates within a wide voltage range, from 2 volts to 6 volts. This versatility allows it to be used in a variety of voltage configurations, making it compatible with different components within a circuit.
Drive Capability:
The outputs of the SN74HC138N are robust and can drive up to 10 LSTTL (Low-Power Schottky Transistor-Transistor Logic) loads. This feature ensures that the decoder can handle multiple downstream components effectively.
Low Power Consumption:
With a maximum power consumption of only 80µA (microamperes), the SN74HC138N is power-efficient, making it suitable for battery-powered or low-power electronic devices.
Fast Propagation Delay (tpd):
The typical propagation delay (tpd) for this decoder is just 15 nanoseconds (ns). This rapid response time ensures that decoded outputs are available quickly after input changes, critical for high-speed applications.
Output Drive Capability:
The SN74HC138N can provide a ±4mA output drive at 5 volts, ensuring stable and reliable signal transmission to connected devices.
Low Input Current:
It features low input current, with a maximum of 1µA (microampere). This minimizes the load on the input circuitry and ensures efficient operation.
Active-Low Outputs:
The decoder offers active-low outputs, meaning the selected output is driven low when enabled. This feature simplifies interfacing with other logic components.
Enable Inputs:
Three enable inputs (G1, G2A, G2B) are incorporated, providing flexibility for cascading or data reception. These inputs allow for efficient control and customization of decoding operations.
3-to-8 Decoding:
The primary function of the SN74HC138N is to decode a 3-bit binary input into one of eight possible outputs, which is particularly useful in memory addressing and selection.
Enable and Output Enable:
The decoder includes an active-low enable input (G) for enabling or disabling the decoding operation. Additionally, the output enable input (OE) allows users to enable or disable the decoder's outputs as needed.
Compatibility:
The SN74HC138N is compatible with both TTL (Transistor-Transistor Logic) and CMOS (Complementary Metal-Oxide-Semiconductor) logic levels, enhancing its versatility in mixed-logic environments.
Applications
LED Displays:
The SN74HC138N plays a crucial role in LED display systems by efficiently decoding input signals to select specific LED segments or modules. This is vital in applications such as digital signage, scoreboards, and alphanumeric displays.
Servers:
Servers often require complex memory addressing and data routing. The SN74HC138N aids in server applications by enabling efficient memory decoding and data selection processes, enhancing server performance.
White Goods:
In household appliances, referred to as "white goods," the SN74HC138N is utilized for tasks like user interface control and display management. It helps control LEDs, displays, and various functions in appliances like refrigerators, washing machines, and ovens.
Power Infrastructure:
Power infrastructure equipment, including power distribution and monitoring systems, relies on precise data selection and signal routing. The SN74HC138N is employed in these applications to facilitate accurate data management and control.
Building Automation:
Building automation systems enhance energy efficiency and convenience in commercial and residential buildings. The decoder is used to control and manage sensors, actuators, and display units in smart building applications.
Factory Automation:
In industrial automation settings, the SN74HC138N contributes to efficient data processing, control, and monitoring. It aids in tasks such as machinery control, sensor interfacing, and display management within factory automation systems.
Address decoding:
It is commonly used in microprocessor systems for address decoding, allowing the CPU to select specific memory or I/O locations based on the binary address input.
Data demultiplexing:
It can be used to route data to one of multiple output channels based on the input code.
Control logic:
It's used in various control and sequencing applications in digital systems.
SN74HC138N Equivalent Parts
74LS138 (TTL-Compatible Version): The 74LS138 is a TTL-compatible 3-to-8 line decoder/demultiplexer. It operates seamlessly with TTL logic levels, making it a suitable choice for applications where TTL compatibility is essential. It shares the same 3-to-8 decoding functionality as the SN74HC138N but uses TTL logic.
74HCT138 (High-Speed CMOS-Compatible Version): The 74HCT138 is a high-speed CMOS-compatible 3-to-8 line decoder/demultiplexer. It combines the benefits of CMOS technology with high-speed operation, making it ideal for applications requiring fast switching times. Like the SN74HC138N, it supports a wide voltage range and can interface with both CMOS and TTL logic.
FAQs
What is the primary function of the SN74HC138N?
The primary function of the SN74HC138N is to decode binary inputs and select one of eight output lines based on that input. It is a 3-to-8 line decoder/demultiplexer IC that simplifies the process of addressing and routing signals in digital systems.
How does the SN74HC138N simplify address decoding in microcontrollers?
The SN74HC138N simplifies address decoding in microcontrollers by taking a 3-bit binary input and selecting one of eight output lines. This functionality allows microcontrollers to efficiently address specific locations in memory or peripherals, making it a crucial component in memory expansion and addressable memory space expansion.
Can I cascade multiple SN74HC138N ICs for larger applications?
Yes, you can cascade multiple SN74HC138N ICs for larger applications. By connecting the outputs of one demultiplexer to the inputs of another, you can expand the number of addressable output lines and handle more complex routing and decoding tasks.
What are the key features that set the SN74HC138N apart from other demultiplexer ICs?
The SN74HC138N offers several advantages, including high-speed operation, low power consumption, and ease of integration into digital circuits. Its ability to decode binary inputs into one of eight output lines makes it a versatile choice for various applications.
Where can I source the SN74HC138N for my electronic projects?
You can source the SN74HC138N demultiplexer IC from a wide range of electronic component suppliers, both online and at physical electronics stores. Popular online platforms and distributors often stock this IC, making it readily available for your electronic projects. Be sure to check the specifications and datasheets to ensure it meets your project requirements.
(Picture: Diagram)
Technical Parameters
- Product Name
- SN74HC138N
- Product Type
- 3-to-8 Line Decoder/Demultiplexer IC
- Manufacturer
- Texas Instruments (TI)
- Number of Inputs
- 3
- Number of Outputs
- 8
- Supply Voltage
- +2V to +6V
- Input Logic Levels
- TTL and CMOS Compatible
- Propagation Delay
- Low, typically in nanoseconds
- Operating Temperature
- -40°C to +85°C
- Package / Case
- Various, e.g., DIP-16, PDIP-16, SOIC-16
- Output Type
- CMOS or TTL Logic Levels
SN74HC138N Datasheet
-
SN74HC138 Family Datasheet
SN74HC138N Equivalent Parts
For the SN74HC138N component, you may consider these replacement and alternative parts.
| Models | Manufacturer | Package/Case | Description |
|---|---|---|---|
| MC74HC138N | FAIRCHILD | DIP-16 | 1-of-8 Decoder / Demultiplexer High-Performance Silicon-Gate CMOS |
| TC74HC138AP | TOSHIBA | DIP16 | Dual 60 V Inductive Load Driver; Package: SC-74 (SC-59ML) 6 LEAD; No of Pins: 6; Container: Tape and Reel; Qty per Container: 3000 |
SN74HC138N Related Products
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