74HC259D

74HC259D

Product Overview

Category

The 74HC259D is a digital integrated circuit (IC) belonging to the category of high-speed CMOS logic devices.

Use

This IC is commonly used in digital electronics for data storage and manipulation. It serves as an 8-bit addressable latch with three-state outputs.

Characteristics

• High-speed operation: The 74HC259D operates at a high clock frequency, making it suitable for applications requiring fast data processing.
• Low power consumption: This IC is designed to consume minimal power, making it energy-efficient.
• Wide operating voltage range: It can operate within a wide voltage range, typically between 2V and 6V.
• Compatibility: The 74HC259D is compatible with both TTL and CMOS logic levels.
• Three-state outputs: It features three-state outputs, allowing multiple devices to share a common bus without interference.

Package

The 74HC259D is available in a standard 16-pin dual in-line package (DIP), which facilitates easy integration into electronic circuits.

Essence

The essence of the 74HC259D lies in its ability to store and manipulate digital data efficiently. It provides a convenient solution for addressing and latching data in various applications.

Packaging/Quantity

The 74HC259D is typically packaged in reels or tubes, containing a quantity of 250 or 2000 units, respectively.

Specifications

• Supply Voltage Range: 2V to 6V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Operating Temperature Range: -40°C to +125°C
• Maximum Clock Frequency: 25 MHz

Detailed Pin Configuration

The 74HC259D has a total of 16 pins, each serving a specific function:

1. GND: Ground reference for the IC.
2. QA-QH: Outputs for the latch, representing the stored data bits.
3. MR: Master Reset input, used to clear the latch.
4. SH/LD: Shift/Load control input, determines whether the inputs are shifted or loaded into the latch.
5. CLK: Clock input, used to synchronize the shifting or loading of data.
6. A0-A2: Address inputs, determine which latch is being accessed.
7. VCC: Positive power supply voltage.

Functional Features

The 74HC259D offers the following functional features:

• Addressable Latch: It can store and retrieve data at specific addresses, allowing efficient data manipulation.
• Three-State Outputs: The outputs can be disabled, enabling multiple devices to share a common bus without interference.
• Easy Integration: The IC can be easily integrated into existing digital circuits due to its compatibility with TTL and CMOS logic levels.

Advantages and Disadvantages

Advantages

• High-speed operation enables fast data processing.
• Low power consumption makes it energy-efficient.
• Wide operating voltage range provides flexibility in various applications.
• Compatibility with TTL and CMOS logic levels simplifies integration.

Disadvantages

• Limited storage capacity: The 74HC259D can only store 8 bits of data.
• Lack of built-in protection features: External circuitry may be required to protect against voltage spikes or noise.

Working Principles

The 74HC259D operates based on the principles of addressable latching. When the SH/LD input is low, the data inputs (A0-A2) are shifted into the internal shift register upon each rising edge of the clock signal. Once the desired data is loaded, raising the SH/LD input to high level latches the data into the addressed latch. The stored data can then be accessed through the corresponding output pins (QA-QH).

Detailed Application Field Plans

The 74HC259D finds applications in various fields, including:

1. Address Decoding: It can be used to decode address signals in microprocessor-based systems.
2. Data Multiplexing: The IC enables efficient multiplexing of data from multiple sources onto a common bus.
3. Memory Expansion: It can be utilized to expand the memory capacity of digital systems by addressing additional memory modules.

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the 74HC259D include:

• 74LS259: A TTL-compatible version with similar pin configuration and functionality.
• CD74HC259E: Another CMOS-compatible variant with comparable specifications and features.

These alternative models can be considered based on specific project requirements or availability.

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