Overview
The SN74HC139DR, produced by Texas Instruments, is a dual 2-line to 4-line decoder/demultiplexer designed for high-performance memory-decoding and data-routing applications. This component is part of the 74HC series, known for its high speed and low power consumption. 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 | Typ | Max | Unit |
|---|---|---|---|---|
| VCC (Supply Voltage Range) | 2 | 6 | V | |
| IOH (Output Current High) | -20 μA | -4 mA / -5.2 mA | mA | |
| IOL (Output Current Low) | 20 μA | 4 mA / 5.2 mA | mA | |
| ICC (Quiescent Current) | 8 | 80 | μA | |
| tpd (Propagation Delay Time) | 10 ns | 175 ns (max at 2V), 44 ns (max at 4.5V), 38 ns (max at 6V) | ns | |
| TJ (Junction Temperature) | 150 | °C | ||
| Tstg (Storage Temperature) | -65 | 150 | °C |
Key Features
- Targeted specifically for high-speed memory decoders and data-transmission systems.
- Wide operating voltage range of 2 V to 6 V.
- Outputs can drive up to 10 LSTTL loads.
- Low power consumption, with a maximum ICC of 80 μA.
- Typical propagation delay time 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.
- Fully buffered inputs, each representing only one normalized load to its driving circuit.
Applications
The SN74HC139DR is particularly useful in high-performance memory systems, data-routing applications, and any scenario where fast enable times and minimal system decoding delays are crucial. It can be employed in various electronic systems requiring efficient decoding and demultiplexing, such as high-speed data transmission systems, memory modules, and other digital circuits.
Q & A
- What is the primary function of the SN74HC139DR?
The SN74HC139DR is a dual 2-line to 4-line decoder/demultiplexer, designed for high-speed memory-decoding and data-routing applications.
- What is the operating voltage range of the SN74HC139DR?
The operating voltage range is from 2 V to 6 V.
- How many LSTTL loads can the outputs of the SN74HC139DR drive?
The outputs can drive up to 10 LSTTL loads.
- What is the typical propagation delay time of the SN74HC139DR?
The typical propagation delay time is 10 ns.
- What is the maximum quiescent current (ICC) of the SN74HC139DR?
The maximum ICC is 80 μA.
- Can the SN74HC139DR be used in high-speed memory systems?
- What types of packages are available for the SN74HC139DR?
It is available in SOIC (D), SSOP (DB), PDIP (N), SOP (NS), and TSSOP (PW) packages.
- What is the junction temperature range for the SN74HC139DR?
The junction temperature range is from -40°C to 85°C for most packages.
- How many enable inputs does the SN74HC139DR have?
It has two enable inputs to simplify cascading and/or data reception.
- What is the storage temperature range for the SN74HC139DR?
The storage temperature range is from -65°C to 150°C.
