Part Number: 74LS259N, DM54LS259, DM74LS259
Function: 8-Bit Addressable Latches
Package: DIP 16 Pin Type
Manufacturer: Signetics, National ->Texas Instruments
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Description
74LS259N is an 8-bit addressable latch IC belonging to the TTL logic family, designed for general-purpose data storage, decoding, and demultiplexing functions. It allows individual control of each latch via address lines, making it highly versatile in digital systems requiring selective data storage or output control.
Features
- 8-bit addressable latch (individually selectable outputs)
- Serial data input with parallel outputs
- Performs serial-to-parallel data storage
- Active-high outputs
- Built-in 1-of-8 decoder / demultiplexer functionality
- Asynchronous clear (reset all outputs)
- Enable/disable input for easy expansion
- TTL-compatible logic levels (LS family)
- Direct replacement for Fairchild 9334
Pinout
Key Electrical Characteristics (Typical)
- Supply voltage (VCC): 5V (TTL standard)
- Low power consumption (LS series)
- Fast switching speed compared to standard TTL
Design Notes
- Ensure proper timing between address and data signals for reliable latching
- Use decoupling capacitor (0.1µF) near VCC pin
- Fan-out capability typical of LS TTL (consider buffering if needed)
- Asynchronous clear is dominant → handle carefully in system reset design
- Useful for expanding I/O lines in microcontroller-based systems
How to Choose This IC
- Use when individual bit-level control is required via address lines
- Suitable for simple memory or control latch applications
- Prefer CMOS alternatives (e.g., 74HC259) for lower power designs
- Ensure compatibility with 5V TTL logic systems
Typical Applications
- Digital storage registers
- LED or relay control (individual bit control)
- Addressable output expansion
- Demultiplexing signals
- Control logic in embedded systems
Alternative / Equivalent Products
- 74HC259 (CMOS low-power version)
- CD4099 (CMOS addressable latch)
- 74LS373 (octal latch, non-addressable alternative)
- 74HC138 (decoder-only alternative)
Acquired by Texas Instruments on September 23rd, 2011.
Other data sheets are available within the file:
54LS259E, 54LS259J, 54LS259W, 74LS259M, 74LS259
74LS259N Datasheet PDF Download
