onsemi Logic - Latches MC74VHC259MELG

The MC74VHC259MELG is an 8-bit addressable latch designed for general-purpose storage applications in digital systems. It is fabricated using silicon gate CMOS technology, providing high-speed operation comparable to Bipolar Schottky TTL devices while maintaining low power dissipation. The device features four operational modes: addressable latch, memory, one-of-eight decoding, and reset. In addressable latch mode, data is written to the selected latch, while other latches retain their previous states. The memory mode preserves the state of all latches, and the one-of-eight mode allows for demultiplexing. This latch supports input voltages up to 7 V, enabling compatibility between 5 V and 3 V circuits. Key specifications include a typical propagation delay of 7.6 ns at 5 V, a maximum supply current of 2 mA, and high noise immunity. The outputs are CMOS-compatible, with high and low output levels defined as greater than 0.8 VCC and less than 0.1 VCC, respectively. The device also features power-down protection on inputs and outputs, balanced propagation delays, and exceeds latch-up performance of 300 mA. ESD performance is rated at over 2000 V for human body model (HBM) testing. The MC74VHC259MELG is available in a SOIC EIAJ-16 package, making it suitable for various applications requiring reliable data storage and manipulation.