The BR93L66 is a 4Kbit EEPROM (Electrically Erasable Programmable Read-Only Memory) manufactured by Rohm Semiconductor. This serial EEPROM utilizes the Microwire interface for communication. As a non-volatile memory device, it retains stored data even when power is removed, making it suitable for storing configuration settings, calibration data, and other critical information.

Applications

• Consumer electronics (TVs, audio equipment, set-top boxes)
• Industrial controls and automation
• Automotive electronics (e.g., car radios, instrument clusters)
• Medical devices
• Security systems

Features

• 4Kbit (512 x 8 or 256 x 16) EEPROM
• Microwire serial interface
• Low-voltage operation
• Self-timed write cycle
• Write protect feature (hardware and software options)
• High reliability and data retention

Benefits

• Non-Volatile Storage: Ensures data is preserved even when power is lost, crucial for storing system settings and calibration parameters.
• Microwire Interface: Simplifies communication with microcontrollers, requiring fewer pins and easing integration into embedded systems.
• Low-Power Consumption: Ideal for battery-powered applications and energy-sensitive designs.
• Write Protection: Prevents accidental data modification, enhancing system stability and preventing corruption.
• Flexible Memory Organization: Can be configured as either 512 x 8 or 256 x 16, adapting to different data storage needs.

Specifications

Typical specifications for the BR93L66 include:

• Memory Size: 4 Kbit (512 x 8 or 256 x 16)
• Supply Voltage: 1.8V to 5.5V (depending on the specific variant)
• Operating Temperature Range: -40°C to +85°C
• Microwire Clock Frequency: Varies; consult datasheet for maximum frequency
• Write Cycle Time: Approximately 5 ms
• Endurance: Typically 1 million write cycles per byte
• Data Retention: 100 years
• Package Options: Commonly available in SOP (Small Outline Package) and TSSOP (Thin Shrink Small Outline Package)

The Microwire interface uses three primary signals: Serial Clock (SK), Serial Data Input (DI), and Serial Data Output (DO), along with a Chip Select (CS) signal to enable communication with the specific EEPROM device. The BR93L66 provides a reliable and versatile non-volatile memory solution for a wide range of applications requiring moderate storage capacity and simple serial communication.