Renesas R1EX24064ATAS0A#U0

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 system configuration storage for embedded controllers and consumer electronics.

For engineers reviewing the R1EX24064ATAS0A datasheet, R1EX24064ATAS0A pinout, R1EX24064ATAS0A application, or R1EX24064ATAS0A equivalent, key selection criteria include I²C timing compliance at 400 kHz, WP-enabled hardware write protection, 5 ms write cycle time, 1,000k endurance cycles, and TSSOP-8 footprint compatibility with space-constrained PCB layouts.

Technical Context

This device implements a standard I²C-compatible two-wire serial interface with fixed 1010 device code, 3-bit hardware address pins (A0–A2), and open-drain SDA/SCL signaling requiring external pull-ups. It uses MONOS nonvolatile memory cells fabricated on CMOS process, enabling low-power operation and high data retention.

The internal architecture includes an address generator, X/Y decoders, sense amplifiers, serial-parallel converter, and high-voltage generator for programming. Write operations are internally timed (t_WC = 5 ms), support byte and 32-byte page modes, and feature acknowledge polling for host synchronization.

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 EEPROM applications.

Compared with AT24C64D-SSHM-T and BR24G64FJ-3GE2, the R1EX24064ATAS0A offers best-in-class high-temperature data retention (10 years @ 85°C) and lowest active write current (3.0 mA max), making it optimal for thermally demanding industrial and automotive applications where long-term configuration integrity is critical.

Availability

R1EX24064ATAS0A is available at Aetrix Electronics and suitable for industrial metering, consumer audio systems, automotive body control modules, and medical diagnostic handhelds requiring stable component supply across multi-year production cycles.

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 enterprise applications.

The R1EX24xxx series was designed specifically for reliable, low-voltage I²C-based configuration storage in space-constrained consumer and industrial electronics - emphasizing MONOS cell longevity, wide VCC range, and robust noise immunity.

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 is confirmed in the AC Characteristics table (t_LOW ≥ 1200 ns, t_HIGH ≥ 600 ns) and applies across the full operating temperature range (−40°C to +85°C) and supply voltage range (1.8 V to 5.5 V). The R1EX24064ATAS0A does not support High-speed mode (3.4 MHz).

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 datasheet specifies VOL ≤ 0.4 V at IOL = 3.0 mA (VCC = 2.7–5.5 V), so pull-up values must be selected considering bus capacitance, VCC level, and desired rise time - typically 2.2 kΩ to 10 kΩ for standard 100–400 kHz operation. The R1EX24064ATAS0A itself does not integrate pull-ups.

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 - byte, page, and erase - and returns NACK after device address reception. When WP is low (VIL ≤ 0.3 × VCC) or floating (internally pulled down to VSS), full read/write access is enabled. This hardware lock operates independently of software commands and remains active during power transitions, providing fail-safe protection against unintended writes.

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

The R1EX24064ATAS0A guarantees 1,000,000 write/erase cycles at 25°C and 100,000 cycles at 85°C. Data retention is rated at 100 years minimum at 25°C and 10 years minimum at 85°C. These values are measured per memory cell and reflect MONOS technology advantages over conventional floating-gate EEPROM - verified in Renesas' REJ03C0332-0200 Rev.2.00 datasheet, page 4.

Is the R1EX24064ATAS0A pin-compatible with other 64 kbit I²C EEPROMs in TSSOP-8 package?

The R1EX24064ATAS0A uses standard TSSOP-8 pinout (A0–A2, VSS, VCC, WP, SCL, SDA) matching JEDEC MO-153 and industry-common 64 kbit I²C EEPROMs such as AT24C64D and BR24G64FJ. However, pin compatibility alone does not ensure drop-in replacement - differences in timing margins, WP behavior, and MONOS vs. floating-gate characteristics require validation. The R1EX24064ATAS0A is not explicitly documented as pin-to-pin compatible with any alternate part.