This document describes the DM54259 and DM74259, which are 8-bit addressable latches designed for general-purpose storage applications in digital systems. These multifunctional devices can operate as storage registers, serial-holding registers, active-high decoders, or demultiplexers. They feature asynchronous parallel clear and an enable/disable input to simplify expansion.
| Storage Capacity | 8-bit |
|---|---|
| Operating Temperature (Commercial) | 0°C to +70°C |
| Supply Voltage (Min) | 4.5V |
| Low Level Output Current | 16 mA |
| High Level Output Current | -0.8 mA |
| Typical Propagation Delay (Enable-to-output) | 18 ns |
| Typical Propagation Delay (Data-to-output) | 21 ns |
| Typical Propagation Delay (Address-to-output) | 22 ns |
| Typical Propagation Delay (Clear-to-output) | 21 ns |
The four modes are addressable-latch mode, memory mode, 1-of-8 decoding or demultiplexing mode, and clear mode.
Yes, the DM54259/DM74259 is listed as a direct replacement for Fairchild 9334.
The recommended supply voltage range is 4.5V to 5.5V for DM54259 and 4.75V to 5.25V for DM74259.