74HC259D (8-Bit Addressable Latch / 1-to-8 Demultiplexer IC - 16-Pin SOIC Surface Mount Package)

When you need to expand your microcontroller's outputs to drive multiple LEDs or relays, the standard choice is a 74HC595 shift register. However, shift registers have a major drawback: if you only want to turn off LED #7, you are forced to clock in the data for all eight LEDs all over again. The 74HC259D takes a completely different, much faster approach. It is an 8-bit addressable latch. Instead of shifting data down a line, you simply use three binary address pins to target one specific output pin. You feed your 1 or 0 into the single Data input, pulse the Latch Enable (LE) pin, and the chip instantly updates only that specific addressed pin, safely holding the previous states of all the other seven pins.

This specific "D" variant comes in a compact 16-pin SOIC surface-mount package, making it perfect for custom PCB designs where board space is at a premium. Built on standard High-Speed CMOS (HC) architecture, it acts as a highly versatile 4-in-1 tool depending on how you drive the Latch Enable and Clear pins: it can function as an addressable latch, a memory demultiplexer, a standard 1-to-8 decoder, or it can instantly wipe all outputs back to LOW.

Key Features & Functional Advantages:

• Targeted Pin Control: Instantly address and change the state of a single output without disrupting the data held on the other seven pins, drastically reducing microcontroller processing overhead.

• 4-Mode Operation: Functions as an addressable latch, a standard 1-to-8 line demultiplexer, a decoder, or a clearable memory bank based on your hardware wiring.

• Master Clear Pin: Features a dedicated active-LOW Clear ($\overline{CLR}$) pin that instantly wipes all eight outputs to Ground, perfect for emergency-stop or reset logic.

• High-Speed CMOS (HC) Architecture: Delivers high-speed nanosecond data routing while operating seamlessly anywhere between 2.0V and 6.0V.

• Surface Mount Design (SOIC-16): The compact "D" package is designed for modern SMD manufacturing, significantly reducing the footprint on your custom printed circuit boards compared to bulky DIP chips.

Perfect For:

• Advanced Pin Expansion: An incredibly efficient way to control massive banks of indicator LEDs or small relays where only one or two states change at a time.

• Custom I/O Routing: The go-to hardware for routing a single serial data line or PWM signal to one of eight different hardware targets on the fly.

• Synthesizer & Audio Matrix Control: Excellent for routing control voltages or trigger signals to specific channels in custom music synthesizers without dropping adjacent channels.

• High-Speed Logic Demultiplexing: Reconstructs parallel data from a serial stream faster than a shift register when paired with a binary counter.

Technical Specifications:

• Logic Family: 74HC (High-Speed CMOS)

• Logic Function: 8-Bit Addressable Latch / 1-to-8 Demultiplexer

• Number of Outputs: 8 (Latched)

• Operating Supply Voltage : 2.0V to 6.0V DC

• Maximum Output Current: 5.2 mA per pin

Ensure your order is placed by 2PM to guarantee next-day delivery! Our commitment to prompt service includes a 24-hour delivery system through our network of carriers, aimed at ensuring your package arrives right on schedule.

Please note, a delivery fee of €4.99 applies for orders under €50. For those in remote areas, be aware that our couriers may apply an extra surcharge. This additional fee helps cover the costs of transporting your items to harder-to-reach locations.