Renesas R1EX25064ATA00A#S0

Overview

R1EX25064ATA00A from Renesas Electronics is a 64-kbit serial SPI EEPROM (8-kword × 8-bit), designed as a non-volatile memory storage device for embedded control systems requiring byte- and page-level write capability, 1.8–5.5 V single-supply operation, and industrial temperature support (−40°C to +85°C). It implements MONOS memory technology for high reliability and integrates hardware write protection (W pin) and software block protection (BP0/BP1 bits).

For engineers reviewing the R1EX25064ATA00A datasheet, R1EX25064ATA00A pinout, R1EX25064ATA00A application, or R1EX25064ATA00A equivalent, key selection considerations include its 32-byte page programming, 5 ms max write cycle time, 1,000k endurance cycles at 25°C, 100-year data retention, and TSSOP-8 package compatibility with space-constrained PCB layouts.

Technical Context

This SPI-compatible EEPROM operates in SPI modes 0 (CPOL=0, CPHA=0) and 3 (CPOL=1, CPHA=1), supporting clock frequencies up to 5 MHz at 2.5–5.5 V and 3 MHz at 1.8–5.5 V. Its internal architecture includes a status register with WIP, WEL, BP1/BP0, and SRWD bits enabling hardware- and software-based write protection schemes.

The device uses advanced MONOS (Metal-Oxide-Nitride-Oxide-Silicon) charge-trapping technology to achieve high endurance and long data retention without requiring external high-voltage programming circuitry. All write operations are self-timed and automatically terminate after t_WC ≤ 5 ms, with the WIP bit indicating active write status for host polling.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT25DF041A-SSH-T and M95M02-DRMN6TP/K, the R1EX25064ATA00A provides optimal balance of industrial temperature support, dual-layer write protection, 32-byte page efficiency, and TSSOP-8 footprint - making it preferred for resource-constrained, security-aware embedded systems where reliability and pin compatibility matter more than raw density or speed.

Availability

R1EX25064ATA00A is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter firmware metadata storage, consumer audio device settings retention, and IoT edge node identity storage requiring stable component supply across multi-year production cycles.

Supply support for R1EX25064ATA00A 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 consumer markets.

The R1EX25xxx Series was designed specifically for cost-sensitive, space-constrained embedded systems needing reliable, low-voltage serial EEPROM with enhanced write protection and long-term data integrity - targeting applications such as set-top boxes, printers, and home appliances.

FAQ

What is the maximum clock frequency supported by the R1EX25064ATA00A?

The R1EX25064ATA00A supports up to 5 MHz SPI clock frequency when operated between 2.5 V and 5.5 V, and up to 3 MHz when operated from 1.8 V to 5.5 V. These limits are specified in the AC Characteristics table of the REJ03C0358-0002 datasheet and reflect guaranteed timing margins across the full industrial temperature range (−40°C to +85°C). Exceeding these frequencies may result in unreliable read/write operations.

Does the R1EX25064ATA00A require external high-voltage programming circuitry?

No, the R1EX25064ATA00A does not require external high-voltage programming circuitry. It uses MONOS (Metal-Oxide-Nitride-Oxide-Silicon) charge-trapping technology that enables full 1.8–5.5 V single-supply operation for both read and write functions. All write operations - including page programming and status register updates - are self-timed and internally managed, eliminating the need for boost converters or charge pumps typically found in older floating-gate EEPROMs.

How does the HOLD pin function during an active SPI transaction on the R1EX25064ATA00A?

When the HOLD pin is asserted low during an active SPI transaction, the R1EX25064ATA00A immediately pauses communication: the serial data output (Q) enters high-impedance state, and serial data input (D) and clock (C) signals are ignored. The device retains its internal state (address pointer, instruction context) and resumes exactly where it left off upon deassertion of HOLD, provided chip select (S) remains low. This allows deterministic interruption without reinitializing the command sequence.

What is the purpose of the SRWD bit in the R1EX25064ATA00A status register?

The Status Register Write Disable (SRWD) bit in the R1EX25064ATA00A works in conjunction with the W (Write Protect) pin to enable Hardware Protected Mode. When SRWD = 1 and W = low, the non-volatile bits of the status register (SRWD, BP1, BP0) become read-only, and the Write Status Register (WRSR) instruction is rejected. This prevents unauthorized modification of block protection settings and ensures immutable configuration lock - a critical feature for certified industrial or metering applications.

Can the R1EX25064ATA00A be used in automotive applications?

The R1EX25064ATA00A is rated for −40°C to +85°C operation and classified as a "Standard" quality grade device per Renesas documentation. While it meets industrial temperature requirements, Renesas explicitly states that its serial EEPROMs (including the R1EX25xxx series) are authorized for consumer applications such as cellular phones and audio equipment - and advises contacting Renesas sales before using them in automotive systems. For AEC-Q100 qualified alternatives, consult Renesas' automotive-grade EEPROM portfolio.