R8A66150SP Datasheet PDF learn more.
Part number: R8A66150
Functions: 12-bit I/O Expander IC
Package information: SOP 20 Pin
Manufacturer: Renesas Technology
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Description
R8A66150SP is a 12-bit I/O expander IC featuring dual independent shift registers for serial-to-parallel and parallel-to-serial data conversion, designed for efficient MCU interface expansion. It supports bidirectional serial communication, flexible I/O configuration, and operates over a wide supply voltage range from 2.0V to 6.0V. This device is commonly used in microcontroller I/O extension, serial communication systems, and general-purpose digital interfacing applications.
Features
- 12-bit shift register for serial-to-parallel and parallel-to-serial conversion
- Independent dual shift registers for simultaneous operation
- Bi-directional serial communication with MCU
- Parallel I/O pins (D1~D12) configurable as input or output
- Schmitt trigger inputs for improved noise immunity (DI, CLK, /S, /CS)
- N-channel open-drain outputs (DO, D1~D12)
- Wide supply voltage range (2.0V to 6.0V)
- Wide operating temperature range (-40°C to +85°C)
- Backward compatible successor to M66006
Pinout
Design Notes
- Use pull-up resistors for open-drain outputs (DO, D1~D12)
- Ensure proper timing between CLK and control signals for reliable data transfer
- Schmitt trigger inputs improve noise immunity in noisy environments
- Configure I/O direction carefully based on system requirements
- Consider bus loading when cascading multiple devices
Typical Circuit Usage
- MCU GPIO expansion via serial interface
- Serial-to-parallel LED or display driving
- Parallel input sensing with serial data readout
- Data acquisition systems with limited MCU pins
- Cascaded shift register chains for extended I/O
How to Choose This Part
- Select when bidirectional serial-parallel conversion is required
- Ensure voltage compatibility with MCU (2.0V–6.0V)
- Evaluate number of I/O channels needed (12-bit)
- Consider open-drain outputs for wired-OR applications
- Use when simultaneous input/output shift operations are beneficial
Applications
- Microcontroller I/O port expansion
- Serial communication systems
- Industrial control interfaces
- Embedded system signal routing
- Peripheral device interfacing
Alternative / Equivalent Products
- M66006
- 74HC595 (output-focused shift register)
- 74HC165 (input shift register)
- MCP23S17 (SPI I/O expander)
- PCF8574 (I2C I/O expander)
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R8A66150SP PDF File
