Overview
The SN74HC259N, produced by Texas Instruments, is an 8-bit addressable latch designed for general-purpose storage applications in digital systems. This component is part of the HC series, known for its high-speed CMOS logic. It offers a wide operating voltage range of 2 V to 6 V, making it versatile for various digital circuit designs. The device can function in multiple modes, including addressable latch, memory, 1-of-8 decoding, and clear modes, making it highly multifunctional. It is particularly useful in applications requiring working registers, serial-holding registers, and active-high decoders or demultiplexers.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 2 | 5 | 6 | V |
| Operating Free-Air Temperature | -40 | 85 | °C | |
| High-Level Input Voltage (VCC = 6 V) | 4.2 | V | ||
| Low-Level Input Voltage (VCC = 6 V) | 1.8 | V | ||
| Output Voltage | 0 | VCC | V | |
| Propagation Delay Time (tpd) at VCC = 6 V | 13 | 26 | ns | |
| Input Current (VI = VCC or 0) | ±100 nA | |||
| Continuous Output Current | ±25 mA |
Key Features
- Wide operating voltage range of 2 V to 6 V.
- High-current inverting outputs drive up to 10 LSTTL loads.
- Low power consumption, with a maximum ICC of 80 μA.
- Typical propagation delay time (tpd) of 14 ns.
- ±4-mA output drive at 5 V.
- Low input current of 1 μA max.
- 8-bit parallel-out storage register performs serial-to-parallel conversion with storage.
- Asynchronous parallel clear.
- Active-high decoder.
- Enable input simplifies expansion.
- Expandable for n-bit applications.
- Four distinct functional modes: addressable latch, memory, 1-of-8 decoding, and clear modes.
Applications
The SN74HC259N is suitable for a variety of digital system applications, including:
- Working registers.
- Serial-holding registers.
- Active-high decoders or demultiplexers.
- General-purpose storage in digital systems.
Q & A
- What is the operating voltage range of the SN74HC259N?
The operating voltage range is from 2 V to 6 V.
- What is the maximum propagation delay time (tpd) at VCC = 6 V?
The maximum propagation delay time is approximately 26 ns.
- How many LSTTL loads can the high-current inverting outputs drive?
The high-current inverting outputs can drive up to 10 LSTTL loads.
- What is the maximum ICC (quiescent current) for the SN74HC259N?
The maximum ICC is 80 μA.
- What are the different functional modes of the SN74HC259N?
The device can operate in four distinct modes: addressable latch, memory, 1-of-8 decoding, and clear modes.
- What is the purpose of the enable input in the SN74HC259N?
The enable input simplifies expansion and allows for easier integration into larger systems.
- Can the SN74HC259N be used as a decoder or demultiplexer?
- What is the maximum continuous output current for the SN74HC259N?
The maximum continuous output current is ±25 mA.
- What is the typical input current for the SN74HC259N?
The typical input current is ±100 nA when VI = VCC or 0.
- What are the package options available for the SN74HC259N?
The device is available in various packages including PDIP, SOIC, SOP, TSSOP, CDIP, and LCCC.
