Infineon Technologies CY15E004J-SXE

Overview

CY15E004J-SXE from Infineon Technologies (formerly Cypress) is a 4-Kbit (512 × 8) serial I²C ferroelectric RAM (F-RAM) with automotive-grade reliability, operating from –40 °C to +125 °C, supporting up to 1-MHz I²C interface, 10¹³ read/write endurance, and zero-delay writes. It serves as a hardware-compatible drop-in replacement for I²C EEPROM in safety-critical data logging and control systems.

For engineers reviewing the CY15E004J-SXE datasheet, CY15E004J-SXE pinout, CY15E004J-SXE application, or CY15E004J-SXE equivalent, key selection criteria include AEC-Q100 Grade 1 compliance, 4.5–5.5 V supply range, write-protect functionality, and absence of write polling - critical for deterministic real-time data capture in automotive ECUs and industrial controllers.

Technical Context

The CY15E004J-SXE implements a true nonvolatile memory architecture using lead zirconate titanate (PZT) ferroelectric capacitors, enabling RAM-like random access with EEPROM-equivalent data retention. Its I²C slave interface adheres strictly to standard protocol timing, including START/STOP conditions, 7-bit slave address with 2-bit device select (A2/A1), and 1-bit page select - all validated per Rev. *C datasheet.

Internally, it organizes memory as two 256-byte pages (9-bit addressing), with automatic address incrementing during sequential reads/writes. No internal charge pump or write-cycle delay circuitry is present - write completion is synchronous with the final I²C clock edge, eliminating software polling and reducing CPU overhead in time-constrained applications.

Key Specifications

Pinout & Package

Package: 8-pin Small Outline Integrated Circuit (SOIC), surface-mount, RoHS-compliant, body width 3.9 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C04C-SSHM-T and FM24V04-G, the CY15E004J-SXE uniquely combines 5 V operation, AEC-Q100 Grade 1 qualification, hardware write protection, and 1-MHz I²C - making it the only option for high-write-rate, high-temperature automotive applications requiring zero-modification integration.

Availability

CY15E004J-SXE is available at Aetrix Electronics and suitable for automotive telematics, brake control units, and engine management systems requiring stable component supply across extended product lifecycles.

Supply support for CY15E004J-SXE 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

Infineon Technologies is a global semiconductor leader headquartered in Munich, Germany, specializing in power management, automotive ICs, and security solutions.

The CY15E004J-SXE belongs to Infineon's automotive F-RAM product line, engineered specifically for mission-critical data logging and configuration storage in ASIL-B systems where EEPROM limitations in endurance, speed, and temperature resilience are unacceptable.

FAQ

Is CY15E004J-SXE pin-compatible with standard 8-pin SOIC I²C EEPROMs like the AT24C04?

Yes - CY15E004J-SXE uses identical 8-pin SOIC footprint and pin assignments (VDD, VSS, SDA, SCL, WP, A1, A2, NC) as industry-standard I²C EEPROMs. No PCB redesign is needed; only firmware verification of I²C timing and WP behavior is required for migration.

Does CY15E004J-SXE require external pull-up resistors on SDA and SCL lines?

Yes - both SDA and SCL are open-drain outputs requiring external pull-up resistors to VDD. Recommended values are 2.2 kΩ for 1 MHz operation; lower values improve rise time but increase static current. Pull-ups must be placed close to the CY15E004J-SXE pins to minimize bus capacitance.

Can the WP pin be left floating, or must it be actively driven?

The WP pin has an internal pull-down resistor and may be left unconnected for default write-enable operation. However, for functional safety compliance, it must be hard-wired to VDD (write-protected) or GND (write-enabled) - floating is not permitted in AEC-Q100-certified designs due to noise susceptibility.

What is the maximum I²C bus capacitance supported by CY15E004J-SXE at 1 MHz?

Per datasheet AC specifications, CY15E004J-SXE supports ≤200 pF total bus capacitance at 1 MHz. This limits trace length to ~10 cm on standard FR-4 with 50 Ω impedance routing. For longer buses, reduce speed to 400 kHz or add active I²C repeaters to maintain signal integrity.