Overview
The SN74HC139NSR is a dual 2-line to 4-line decoder/demultiplexer produced by Texas Instruments. This component is specifically designed for high-performance memory-decoding and data-routing applications that require very short propagation delay times. It features two individual 2-line to 4-line decoders in a single package, making it ideal for minimizing system decoding delays in high-speed memory systems.
Key Specifications
| Parameter | Min | Nom | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 2 | 5 | 6 | V |
| Operating Temperature Range | -40 | 85 | °C | |
| Input Voltage (VI) | 0 | VCC | V | |
| Output Voltage (VO) | 0 | VCC | V | |
| Input Transition Rise/Fall Time | 400 | 1000 | ns | |
| Continuous Output Current | ±25 | mA | ||
| Package Type | SOP (NS) | |||
| Number of Pins | 16 |
Key Features
- Wide operating voltage range of 2 V to 6 V.
- Outputs can drive up to 10 LSTTL loads.
- Low power consumption, 80-μA max ICC.
- Typical propagation delay time (tpd) of 10 ns.
- ±4-mA output drive at 5 V.
- Low input current of 1 μA max.
- Incorporate two enable inputs to simplify cascading and/or data reception.
Applications
The SN74HC139NSR is targeted for high-speed memory decoders and data-transmission systems. It is particularly useful in high-performance memory systems where fast enable circuits are employed, ensuring that the delay time introduced by the decoders is negligible. It can also be used in demultiplexing applications where the active-low enable input can act as a data line.
Q & A
- What is the operating voltage range of the SN74HC139NSR? The operating voltage range is 2 V to 6 V.
- How many LSTTL loads can the outputs drive? The outputs can drive up to 10 LSTTL loads.
- What is the typical propagation delay time (tpd) of the SN74HC139NSR? The typical propagation delay time is 10 ns.
- What is the maximum power consumption of the SN74HC139NSR? The maximum power consumption is 80-μA.
- What is the output drive capability at 5 V? The output drive capability at 5 V is ±4-mA.
- What is the maximum input current? The maximum input current is 1 μA.
- How many enable inputs does the SN74HC139NSR have? The SN74HC139NSR has two enable inputs.
- What is the package type of the SN74HC139NSR? The package type is SOP (NS) with 16 pins.
- What is the operating temperature range of the SN74HC139NSR? The operating temperature range is -40°C to 85°C.
- Can the SN74HC139NSR be used in demultiplexing applications? Yes, it can be used in demultiplexing applications where the active-low enable input can act as a data line.
