Renesas R1EX24064ATAS0A#S0

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 −40°C to +85°C industrial temperature range - used in embedded system configuration storage and sensor calibration data retention.

For engineers reviewing the R1EX24064ATAS0A datasheet, R1EX24064ATAS0A pinout, R1EX24064ATAS0A application, or R1EX24064ATAS0A equivalent, key selection considerations include its I²C-compatible timing compliance (tLOW ≥ 1200 ns, tHIGH ≥ 600 ns), write-protection logic (WP pin active-high), 5 ms internal write cycle time, and 1,000k endurance cycles at 25°C - critical for firmware parameter logging and power-fail-safe settings backup.

Technical Context

This device implements a standard I²C-compliant two-wire serial interface with fixed 4-bit device code "1010", 3-bit hardware-selectable address (A0–A2), and R/W bit control. It uses MONOS nonvolatile memory cells fabricated on CMOS process, enabling low-voltage operation and high data retention.

The internal architecture includes an 8-bit serial-parallel converter, address generator, X/Y decoders, sense amplifiers, and high-voltage generator for programming. Write operations are internally timed (tWC = 5 ms max), with acknowledge polling support to detect completion without fixed delay timing.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C64D-SSHM-T and BR24G64FJ-3GE2, the R1EX24064ATAS0A offers superior endurance (1M vs. 400k cycles) and proven MONOS-based data retention - making it optimal for industrial systems requiring decades of unattended operation, while maintaining pin- and protocol-level compatibility with standard I²C EEPROM drivers.

Availability

R1EX24064ATAS0A is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and power-fail data logging requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, power, and memory solutions for industrial, automotive, and infrastructure markets.

The R1EX24xxx series was designed specifically for reliable, low-voltage, high-endurance nonvolatile storage in space- and power-constrained embedded systems - emphasizing robustness in industrial temperature ranges and seamless I²C integration.

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 I²C Fast-mode specifications. This allows efficient communication with host microcontrollers while maintaining signal integrity on typical PCB traces. The device guarantees tLOW ≥ 1200 ns and tHIGH ≥ 600 ns under all operating conditions (−40°C to +85°C, 1.8–5.5 V), ensuring reliable timing margin in noisy industrial environments. R1EX24064ATAS0A does not support standard-mode (100 kHz) or high-speed mode (3.4 MHz) operation.

How does the write protect (WP) pin function on the R1EX24064ATAS0A?

The WP pin on the R1EX24064ATAS0A is an active-high hardware write inhibit. When WP is driven high (VIH ≥ 0.7×VCC), all write operations - including byte and page writes - are blocked across the full 64 kbit memory array, and the device responds with NACK after address transmission. When WP is low or floating (internally pulled down), full read/write access is enabled. This feature provides fail-safe protection against unintended writes during power transitions or firmware faults. R1EX24064ATAS0A implements this logic independently of software commands, ensuring reliability even if host MCU firmware is corrupted.

What is the page write capability of the R1EX24064ATAS0A, and how does it improve system performance?

The R1EX24064ATAS0A supports 32-byte page writes, meaning up to 32 consecutive bytes can be loaded into the internal buffer and committed to memory in a single 5 ms internal write cycle. This eliminates the need for 32 separate stop/start sequences required for byte writes, reducing I²C bus occupation by ~90% and lowering host MCU intervention overhead. For example, writing a 32-byte calibration table takes one I²C transaction instead of 32 - significantly improving real-time responsiveness in systems like motor controllers. R1EX24064ATAS0A enforces page boundaries (addresses 0–31, 32–63, etc.), and rollover within a page occurs if more than 32 bytes are sent.

What is the endurance and data retention specification for the R1EX24064ATAS0A?

The R1EX24064ATAS0A guarantees 1,000,000 write/erase cycles at 25°C and 100 years of data retention at 25°C, based on MONOS memory cell technology. At 85°C, endurance reduces to 100,000 cycles and retention to 10 years - values validated per JEDEC standards. These figures reflect actual measured performance, not extrapolated projections. R1EX24064ATAS0A achieves this without external high-voltage circuitry, making it suitable for applications requiring decades of field operation, such as utility meter firmware parameter storage or medical device calibration archives.

Is the R1EX24064ATAS0A compatible with standard I²C protocol stacks and drivers?

Yes, the R1EX24064ATAS0A is fully compatible with standard I²C protocol stacks and drivers. It uses the industry-standard 7-bit device address format with fixed "1010" prefix, supports standard start/stop conditions, ACK/NACK handshaking, and adheres to I²C Fast-mode timing requirements (400 kHz). Its 3-bit hardware address (A0–A2) allows up to eight devices on one bus, and its page write and acknowledge polling features align with common I²C EEPROM driver libraries (e.g., STM32 HAL, Arduino Wire). R1EX24064ATAS0A requires no proprietary initialization or command sequences - it behaves identically to generic 64 kbit I²C EEPROMs in software integration.