Renesas R1EX24064ATAS0A#RS

Overview

R1EX24064ATAS0A from Renesas Electronics is a 64-kbit (8,192 × 8-bit) two-wire serial EEPROM with I²C interface, 1.8–5.5 V single-supply operation, 400 kHz clock frequency, and TSSOP-8 package. It delivers high reliability via MONOS memory technology, supports 32-byte page writes, and is rated for industrial temperature (−40 to +85°C) in consumer and industrial embedded systems.

For engineers reviewing the R1EX24064ATAS0A datasheet, R1EX24064ATAS0A pinout, R1EX24064ATAS0A application, or R1EX24064ATAS0A equivalent, key selection considerations include write endurance (1,000k cycles), data retention (100 years at 25°C), WP-controlled hardware write protection, low-power standby current (2 µA max), and compatibility with standard I²C bus timing requirements.

Technical Context

This device implements a true two-wire I²C-compatible serial interface with fixed 1010 device code, 3-bit hardware addressable A0–A2 pins enabling up to eight devices on one bus, and open-drain SDA/SCL requiring external pull-ups. The internal address counter supports current-address, random, and sequential read modes.

Write operations are controlled by the WP pin: when high, full 64-kbit array write protection is active; when low, byte and 32-byte page writes are enabled with 5 ms internal write cycle time. Acknowledge polling allows host firmware to detect write completion without fixed delay.

Key Specifications

Pinout & Package

Package: 8-pin plastic TSSOP (PTSP0008JC-B / TTP-8DAV), lead-free, 4.4 mm × 3.0 mm body, 0.65 mm pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar EEPROM applications.

Compared with AT24C64D-SSHM-T and BR24G64FJ-WE2, the R1EX24064ATAS0A offers superior long-term data integrity via MONOS technology and tighter 2 µA standby current, making it optimal for ultra-low-power or mission-critical configuration storage where write endurance and retention are primary concerns.

Availability

R1EX24064ATAS0A is available at Aetrix Electronics and suitable for smart energy meters, industrial PLC I/O modules, medical diagnostic equipment, and automotive infotainment head units requiring stable component supply, long-lifecycle support, and guaranteed industrial-temperature performance.

Supply support for R1EX24064ATAS0A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics Corporation is a global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and IoT applications.

The R1EX24xxx series was designed specifically for reliable, low-voltage, high-endurance non-volatile storage in space-constrained embedded systems where I²C simplicity and long-term data integrity are essential.

FAQ

What is the maximum I²C clock frequency supported by the R1EX24064ATAS0A?

The R1EX24064ATAS0A supports a maximum I²C clock frequency of 400 kHz, compliant with standard-mode I²C specifications. This allows efficient communication with most microcontrollers while maintaining timing margins for noise immunity. The device specifies minimum tLOW (1200 ns) and tHIGH (600 ns) to ensure reliable operation at this rate. Exceeding 400 kHz may result in timing violations and failed ACK detection.

Does the R1EX24064ATAS0A require external pull-up resistors on SDA and SCL lines?

Yes, the R1EX24064ATAS0A requires external pull-up resistors on both SDA and SCL lines because these pins use open-drain output drivers. The recommended value depends on bus capacitance and speed: typically 2.2–10 kΩ for 400 kHz operation with ≤400 pF total capacitance. Failure to install pull-ups will prevent proper I²C communication, as neither pin can drive high actively.

How does the Write Protect (WP) pin function on the R1EX24064ATAS0A?

When the WP pin is driven high (VIH ≥ 0.7×VCC), the R1EX24064ATAS0A disables all write operations across the full 64-kbit memory array and returns NACK after address transmission. When WP is low (VIL ≤ 0.3×VCC) or left unconnected (internally pulled down), full read/write access is enabled. This hardware lock provides fail-safe protection against unintended writes during power transients or firmware errors.

What is the page write size of the R1EX24064ATAS0A, and why does it matter?

The R1EX24064ATAS0A supports 32-byte page writes, meaning up to 32 consecutive bytes can be programmed in a single internal write cycle (5 ms). This significantly reduces total programming time versus byte-wise writes-e.g., writing 32 bytes takes ~5 ms instead of 160 ms. For applications like saving calibration tables or firmware metadata, this improves system responsiveness and reduces MCU wait time during configuration updates.

Is the R1EX24064ATAS0A suitable for automotive applications?

The R1EX24064ATAS0A is rated for −40°C to +85°C operation and meets RoHS requirements, but Renesas explicitly states that its serial EEPROMs are authorized for consumer applications (e.g., camcorders, audio equipment) and require sales office consultation before use in automotive systems. It lacks AEC-Q100 qualification and is not designated for "High Quality" or "Specific" grade applications per Renesas' quality classification policy.