NXP 74HC259D 8-bit Addressable Latch, SOIC16

The NXP 74HC259D is a sophisticated 8-bit addressable latch, offering flexible control for a wide range of digital design applications. This integrated circuit provides four distinct modes of operation, giving engineers significant versatility in system architecture.

In its addressable latch mode, data present at the D input is written into a specific latch selected by the A0 to A2 address inputs. The selected latch will follow the data input, while all non-addressed latches retain their previous states, allowing for random data entry. In the memory mode, all latches hold their data, independent of changes on the address or data lines. For decoding applications, the 3-to-8 decoding or demultiplexing mode drives the addressed output to follow the D input while forcing all other outputs low. A common reset input provides a reset mode, forcing all outputs low regardless of other inputs.

Key features include inputs with clamp diodes, enabling the use of current-limiting resistors to interface with signals exceeding the VCC supply voltage. This enhances the device's robustness in mixed-voltage environments. The IC offers serial-to-parallel conversion capability, with output available from each individual storage bit. Its design is easily expandable for wider data paths and complies with the JEDEC standard No. 7A for CMOS input levels, ensuring reliable interoperability.

Fabricated with high-speed CMOS technology, it provides low power consumption alongside high noise immunity. The SOIC16 package is designed for efficient PCB space utilisation and is suitable for automated assembly processes.

Specifications Summary

• Logic Family: 74HC
• Number of Bits: 8-bit
• Latch Type: Addressable
• IC Output Type: Non-Inverted
• Propagation Delay: 18ns
• Output Current: 25mA
• Supply Voltage Range: 2V to 6V
• Operating Temperature Range: -40°C to +125°