Renesas RM24EP64C-BSNC-T

Overview

RM24EP64C-BSNC-T from Adesto Technologies is a sterilization-tolerant 64Kbit I²C-compatible serial EEPROM replacement based on CBRAM® resistive memory technology, operating from 2.7V to 3.6V, supporting 100kHz/400kHz I²C bus speeds, and delivering 50µs byte write and 1ms page write performance for medical device data logging and calibration storage.

For engineers reviewing the RM24EP64C-BSNC-T datasheet, RM24EP64C-BSNC-T pinout, RM24EP64C-BSNC-T application, or RM24EP64C-BSNC-T equivalent, key selection criteria include gamma/e-beam sterilization tolerance (200kGy), ultra-low 60nJ byte write energy, 10-year data retention at 70°C, and dual SOIC/TSSOP package compatibility with I²C slave addressing via E0–E2 pins.

Technical Context

This device implements a slave-only I²C interface with SDA (open-drain, pull-up required) and SCL (input only), using three external enable pins (E0, E1, E2) to support up to eight devices on one bus via 3-bit address matching in the control byte. The internal address pointer wraps within 32-byte pages during byte writes and auto-increments during sequential reads.

Write protection is hardware-controlled via the WP pin: tied to GND enables writes; tied to VCC inhibits all write operations while permitting reads. Acknowledge polling-sending the control byte post-STOP-is used to detect write completion, as the device suspends ACK generation during internal write cycles lasting up to 5ms for full-page writes.

Key Specifications

Pinout & Package

RM24EP64C-BSNC-T is supplied in an 8-lead SOIC (SN) package per JEDEC MS-012, 0.150" wide body, with gull-wing leads and RoHS/halogen-free construction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar non-volatile serial memory applications.

Compared with AT24C64D-SSHM-T and FM24V01A-G, RM24EP64C-BSNC-T uniquely delivers validated 200kGy sterilization tolerance with I²C compatibility and hardware write protection-making it the only drop-in option for FDA-cleared devices requiring both radiation resilience and regulatory auditability of stored parameters.

Availability

RM24EP64C-BSNC-T is available at Aetrix Electronics and suitable for implantable sensor calibration, reusable surgical instrument logging, and portable diagnostic device settings requiring stable component supply across extended production lifecycles and strict sterilization compliance.

Supply support for RM24EP64C-BSNC-T 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

Adesto Technologies (acquired by Dialog Semiconductor in 2020, now part of Renesas) specialized in low-power, high-reliability non-volatile memory solutions for medical, industrial, and IoT applications before its integration into Renesas' analog and power portfolio.

RM24EP64C-BSNC-T belongs to Adesto's Mavriq™ family of sterilization-tolerant serial memories, engineered specifically for medical devices requiring repeated terminal sterilization without memory degradation or data loss.

FAQ

What sterilization methods is RM24EP64C-BSNC-T qualified for?

RM24EP64C-BSNC-T is explicitly tested and rated for both gamma irradiation and e-beam sterilization up to 200kGy-matching the maximum dose used in commercial medical device sterilization processes. This qualification is documented in Section 12 of the DS-RM24EP64C–054D datasheet and verified through Adesto's internal radiation testing protocol. Unlike standard EEPROMs, RM24EP64C-BSNC-T maintains full functionality and data integrity after exposure, making it suitable for Class II and Class III reusable or implantable devices.

Does RM24EP64C-BSNC-T require external pull-up resistors on SDA and SCL lines?

Yes, RM24EP64C-BSNC-T requires external pull-up resistors on both SDA and SCL lines because SDA is open-drain and SCL is input-only. The datasheet specifies 2kΩ for 400kHz operation and 10kΩ for 100kHz. These values ensure proper rise times (≤300ns) and bus capacitance compliance (<400pF). Failure to install appropriate pull-ups will result in communication failure or intermittent ACK/NACK behavior during I²C transactions.

How does the WP pin function during power-up or brown-out conditions?

The WP pin on RM24EP64C-BSNC-T is sampled only at the STOP condition of each write command-not continuously. During power-up, the internal reset circuit holds the device in reset until Vcc reaches VVCCI (2.4V) and stabilizes for 75µs (tPUD). If WP is high at the first valid STOP after reset, writes remain disabled; if low, writes are enabled. Brown-out events below VVCCI retrigger reset, restoring default WP sampling behavior upon recovery.

Can RM24EP64C-BSNC-T replace standard EEPROMs without firmware changes?

Yes, RM24EP64C-BSNC-T is pin- and command-compatible with industry-standard 2-wire I²C EEPROMs (e.g., AT24C64), using identical control byte format (1010 E2 E1 E0 R/W), address structure (A12–A0), and read/write protocols. No firmware modifications are needed for basic byte/page read/write operations. However, users should verify timing margins-especially tBW (50µs) and tPW (1ms)-as RM24EP64C-BSNC-T significantly outperforms legacy EEPROMs in speed and energy efficiency.

What is the maximum number of RM24EP64C-BSNC-T devices supported on a single I²C bus?

Up to eight RM24EP64C-BSNC-T devices can share one I²C bus using the E0, E1, and E2 hardware address pins. Each combination of logic levels on these three pins generates a unique 3-bit identifier that matches bits 3–1 in the I²C control byte (1010 E2 E1 E0 R/W). This eliminates software address conflicts and allows deterministic multi-device addressing without additional I²C multiplexers or address translation logic.