Renesas R1EX24064ATAS0I#S0

Overview

R1EX24064ATAS0I from Renesas Electronics is a 64 kbit (8,192 × 8-bit) two-wire serial EEPROM with I²C interface, 400 kHz clock frequency, 1.8–5.5 V single-supply operation, and TSSOP-8 package. It delivers 32-byte page write capability, 5 ms write cycle time, and operates across −40°C to +85°C for industrial embedded control and sensor calibration storage.

For engineers reviewing the R1EX24064ATAS0I datasheet, R1EX24064ATAS0I pinout, R1EX24064ATAS0I application, or R1EX24064ATAS0I equivalent, this page provides verified electrical parameters, TSSOP-8 terminal mapping, real-world use cases in power management and firmware configuration, and validated alternative parts with documented functional differences.

Technical Context

This device implements a MONOS-based nonvolatile memory cell architecture with integrated high-voltage generator and serial-parallel converter, enabling reliable byte/page writes over 1,000k cycles at 25°C. Its I²C-compatible interface supports standard-mode timing (tLOW ≥ 1200 ns, tHIGH ≥ 600 ns) and noise suppression up to 50 ns.

The internal address generator and dual-level voltage detector ensure robust operation during VCC ramp-up (≥2 μs/V), while open-drain SDA and active-low WP pins support system-level write protection and bus arbitration. Device addressing uses hardwired A0–A2 pins (internally pulled down) with fixed "1010" device code and R/W bit for read/write selection.

Key Specifications

Pinout & Package

Package: 8-pin plastic TSSOP (PTSP0008JC-B / TTP-8DAV), 4.4 mm × 3.0 mm body, 0.65 mm pitch, Ni/Pd/Au plating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C64D-SSHM-T and M95640-DFMN6TP/K, R1EX24064ATAS0I offers superior endurance at industrial temperatures and native I²C bus sharing-critical for systems integrating multiple sensors or actuators on one controller.

Availability

R1EX24064ATAS0I is available at Aetrix Electronics and suitable for industrial sensor calibration, power supply configuration, and firmware bootloader storage requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for R1EX24064ATAS0I 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 is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power devices for industrial, automotive, and infrastructure markets.

The R1EX24xxx series targets cost-sensitive, space-constrained embedded systems needing reliable nonvolatile storage with low-voltage operation and I²C simplicity-designed specifically for sensor nodes, power converters, and edge IoT endpoints.

FAQ

What is the maximum I²C clock frequency supported by R1EX24064ATAS0I?

R1EX24064ATAS0I supports a maximum I²C clock frequency of 400 kHz in standard mode. This is confirmed in the AC Characteristics table (Page 4), where fSCL max = 400 kHz, and timing parameters like tLOW (≥1200 ns) and tHIGH (≥600 ns) are specified accordingly. The device does not support fast-mode (1 MHz) or higher speeds.

Does R1EX24064ATAS0I require external pull-up resistors on SDA and SCL lines?

Yes, R1EX24064ATAS0I requires external pull-up resistors on both SDA and SCL lines because the SDA pin has an open-drain structure and SCL is an input-only pin. The datasheet (Page 6) explicitly states that SDA "needs to be pulled up by resistor" and recommends selecting resistor values based on VOL, IOL, and bus capacitance to meet timing requirements.

How does the write protect (WP) pin function on R1EX24064ATAS0I?

On R1EX24064ATAS0I, the WP pin is active-high: when WP = VIH (≥0.7×VCC), full 64 kbit memory is write-protected and returns NACK after address transmission; when WP = VIL (≤0.3×VCC), normal read/write operations are permitted. The pin is internally pulled down, so leaving it unconnected defaults to write-enabled operation.

What is the guaranteed endurance and data retention for R1EX24064ATAS0I?

R1EX24064ATAS0I guarantees ≥1,000,000 write/erase cycles at 25°C and ≥100 years of data retention at 25°C, as stated in the Memory Cell Characteristics table (Page 3). At 85°C, endurance drops to ≥100,000 cycles and retention to ≥10 years-values verified in shipped sample characterization.

Is R1EX24064ATAS0I compatible with 1.8 V microcontrollers?

Yes, R1EX24064ATAS0I is fully compatible with 1.8 V microcontrollers. Its DC Operating Conditions (Page 3) specify VCC min = 1.8 V, VIH min = 0.7×VCC (so 1.26 V at 1.8 V), and VIL max = 0.3×VCC (0.54 V), ensuring reliable logic-level recognition from 1.8 V I/O drivers without level shifters.