Overview
The SN74HC259NS is an 8-bit addressable latch produced by Texas Instruments. It is designed for general-purpose storage applications in digital systems. This component is multifunctional, capable of operating in four distinct modes: addressable-latch mode, memory mode, 1-of-8 decoding or demultiplexing mode, and clear mode. It features a wide operating voltage range, low power consumption, and high-current inverting outputs, making it versatile for various digital system needs.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 2 | - | 6 | V |
| ICC (Quiescent Current) | - | - | 80 | μA |
| IOH (Output Current High) | -20 | - | - | mA |
| IOL (Output Current Low) | 20 | - | - | mA |
| tpd (Propagation Delay Time) | 14 | - | - | ns |
| tw (Pulse Duration CLR Low) | 80 | - | 120 | ns |
| tsu (Setup Time, Data or Address Before G↑) | 75 | - | 115 | ns |
| th (Hold Time, Data or Address After G↑) | 5 | - | 5 | ns |
| TJ (Junction Temperature) | - | - | 150 | °C |
| Tstg (Storage Temperature) | -65 | - | 150 | °C |
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, 80-μA max ICC
- Typical tpd = 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
Applications
The SN74HC259NS is suitable for various applications in digital systems, including:
- Working registers
- Serial-holding registers
- Active-high decoders or demultiplexers
- General-purpose storage applications
Q & A
- What is the operating voltage range of the SN74HC259NS?
The operating voltage range is from 2 V to 6 V. - What is the maximum quiescent current (ICC) of the SN74HC259NS?
The maximum quiescent current is 80 μA. - 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 typical propagation delay time (tpd) of the SN74HC259NS?
The typical propagation delay time is 14 ns. - What are the four distinct functional modes of the SN74HC259NS?
The four modes are addressable-latch mode, memory mode, 1-of-8 decoding or demultiplexing mode, and clear mode. - What is the purpose of the enable input in the SN74HC259NS?
The enable input simplifies expansion and controls the functional modes. - Can the SN74HC259NS be used as a decoder or demultiplexer?
Yes, it can be used as an active-high decoder or demultiplexer. - What is the storage temperature range for the SN74HC259NS?
The storage temperature range is from -65°C to 150°C. - What is the maximum junction temperature for the SN74HC259NS?
The maximum junction temperature is 150°C. - How many bits does the parallel-out storage register of the SN74HC259NS have?
The parallel-out storage register has 8 bits.
