ON Semiconductor MC74HC595: 8-Bit Shift Register with Output Latches

The MC74HC595 device from ON Semiconductor is an integrated circuit that features an 8-bit serial-in, parallel-out shift register with a storage register and 3-state outputs. This versatile component is designed for use in a wide array of applications, ranging from digital data processing to signal routing and conversion. The MC74HC595 is a valuable tool for expanding the output capabilities of microcontrollers while minimizing the number of I/O pins used.

Key Features

• 8-bit Serial Input: Data is inputted serially, allowing for the use of a minimal number of microcontroller pins to control a large number of outputs.
• Parallel Output: After serial input, data can be outputted in parallel format, enabling the simultaneous control of up to 8 separate output lines.
• Output Latches: The inclusion of latches ensures that output data remains stable while new data is being shifted into the register.
• 3-State Outputs: The MC74HC595 features 3-state outputs which can be set to high, low, or high-impedance, allowing for direct connection to a bus or other common lines without interference.
• Shift/Register Clock Inputs: Separate clocks for the shift and storage register provide precise control over data manipulation and output timing.

Applications

The MC74HC595 is an ideal choice for a variety of applications, such as:

• LED displays and LED matrix control
• Digital control circuits
• Serial-to-parallel data conversion
• Interface circuitry for microprocessors
• Signal routing and multiplexing

Technical Specifications

The device operates over a wide voltage range from 2V to 6V and is compatible with TTL standards. It also features a high noise immunity characteristic of CMOS devices. The shift register and latches have separate clocks, and a direct clear input is also provided. The output drive capability is up to 15 LSTTL loads, ensuring compatibility with various logic families.

With its robust design and flexibility, the ON Semiconductor MC74HC595 shift register is a must-have for designers looking to expand outputs in a compact and efficient manner.