The 74LS series of integrated circuits (ICs) was one of the most popular logic families of transistor-transistor logic (TTL) logic chips. 74LS series is a bipolar, low-power Schottky IC. 74LS259 8-bit addressable latch is designed for general-purpose storage applications in digital systems. Specific uses include working registers, serial-holding registers, and active-high decoders or demultiplexers

74LS259 Features
- 8-bit Parallel Out Storage Register Performs Serial to Parallel Conversion
- Asynchronous Parallel Clear
- Active High Decoder
- Enable/Disable Input Simplifies Expansion
- Standard TTL Switching Voltages
74LS259 Specifications
Supply Voltage | 4.75 – 5.25Vdc |
Maximum Clock Frequency | 40Mhz |
Power Dissipation | 2mW/gate @100kHz |
Minimum Output Current | 8mA |
Propagation Delay | 10nS |
Fan Out (TTL Loads) | 20 |
74LS259 Pinout Diagram

74LS259 Pin Description
Pin No | Pin Name | Description |
1 | A0 | Address input |
2 | A1 | Address input |
3 | A2 | Address input |
4 | Q0 | Parallel Latch Output |
5 | Q1 | Parallel Latch Output |
6 | Q2 | Parallel Latch Output |
7 | Q3 | Parallel Latch Output |
8 | GND | Ground |
9 | Q4 | Parallel Latch Output |
10 | Q5 | Parallel Latch Output |
11 | Q6 | Parallel Latch Output |
12 | Q7 | Parallel Latch Output |
13 | D | Data Pin |
14 | E’ | Enable Pin(Active Low) |
15 | C’ | Clear Pin(Active Low) |
16 | VCC | Positive Supply |
Applications
- Working registers
- Serial-holding registers
- Active-high decoders or demultiplexers.
74LS259 Alternative Equivalent
Download 74LS259 8-Bit Addressable Latch Datasheet from the link given below.