74LS259 IC is a high-speed 8-Bit Addressable Latch designed for general-purpose storage applications in digital systems. It is a multifunctional device capable of storing single-line data in eight addressable latches, and also a 1 of 8 decoder and demultiplexer with active High outputs. The device also incorporates an active LOW common Clear for resetting all latches, as well as, an active LOW Enable. The output of the IC always comes in a Push-Pull configuration which makes it easy to work with other devices and microcontrollers. The IC offers a wide array of features such as variable operating voltages, ESD protection & thermal overload protection.
What is a Latching Logic Circuit?
A latch is a device that can be used to store one bit of information. Latching logic circuits are used to capture, or ‘latch’ the logic level which is present on the Data line when the clock input is high. For example, in a D-type latching circuit, If the data on the D line changes state while the clock pulse is high, then the output, Q, follows the input, D. When the CLK input falls to logic 0, the last state of the D input is trapped and held in the latch.
74LS259 Pinout
74LS259 Pin Configuration
| Pin No | Pin Name | Description |
|---|---|---|
| 1 | A0 | Address input Pin A0 |
| 2 | A1 | Address input Pin A1 |
| 3 | A2 | Address input Pin A2 |
| 4 | Q0 | Parallel Latch Output Pin Q0 |
| 5 | Q1 | Parallel Latch Output Pin Q1 |
| 6 | Q2 | Parallel Latch Output Pin Q2 |
| 7 | Q3 | Parallel Latch Output Pin Q3 |
| 8 | GND | Ground Pin |
| 9 | Q4 | Parallel Latch Output Pin Q4 |
| 10 | Q5 | Parallel Latch Output Pin Q5 |
| 11 | Q6 | Parallel Latch Output Pin Q6 |
| 12 | Q7 | Parallel Latch Output Pin Q7 |
| 13 | D | Data Input Pin |
| 14 | E’ | Active Low Enable Pin |
| 15 | C’ | Active Low Clear Pin |
| 16 | Vcc | Chip Supply Voltage |
74LS259 Features & Specifications
- Function: Addressable Latch
- Channels (#): 8
- Technology Family: LS
- VCC (Min) (V): 4.75
- VCC (Max) (V): 5.25
- Serial-to-Parallel Conversion
- Eight Bits of Storage With Output of Each Bit Available
- Random (Addressable) Data Entry
- Active High Demultiplexing or Decoding Capability
- Easily Expandable
- Asynchronous Parallel Clear
- Input type: Bipolar
- Output type: Push-Pull
- Data rate (Max): 70Mbps
- IOL (Max): 8mA
- IOH (Max): -0.4mA
- Propagation speed (tpd): 5-10ns
Applications
- They are used in devices such as working registers, serial-holding registers, and active-high decoders or demultiplexers.
You can download this Datasheet for 74LS259 8-Bit Addressable Latches from the link given below:
See Also: 74LS164 8-Bit Shift Register IC With Parallel Outputs – Datasheet | 74LS153 Dual 4 To 1 Line Multiplexer IC – Datasheet | 74LS132 Quad 2-Input Schmitt trigger NAND Gate IC – Datasheet
