Infineon Technologies CY15B064J-SXA

Overview

CY15B064J-SXA from Cypress Semiconductor is a 64-Kbit (8K × 8) serial I²C automotive-grade ferroelectric RAM (F-RAM), functioning as nonvolatile memory with RAM-like write performance, 10¹⁴ read/write endurance, 151-year data retention, and operation from –40 °C to +85 °C. It serves as a hardware drop-in replacement for I²C EEPROM in automotive body control modules requiring frequent logging of fault codes.

For engineers reviewing the CY15B064J-SXA datasheet, CY15B064J-SXA pinout, CY15B064J-SXA application, or CY15B064J-SXA equivalent, key selection criteria include NoDelay™ write capability, I²C bus compatibility at 1 MHz, WP-controlled write protection, SOIC-8 packaging, and guaranteed automotive-A temperature performance without polling overhead.

Technical Context

The CY15B064J-SXA implements a true nonvolatile memory core using lead zirconate titanate (PZT) ferroelectric capacitors, enabling immediate byte-write completion without internal write cycles or voltage boosting. Its I²C interface supports standard-mode (100 kHz), fast-mode (400 kHz), and fast-mode plus (1 MHz) timing, with full backward compatibility including legacy ACK/NACK and START/STOP protocols.

Addressing uses a 13-bit linear address space (0x0000–0x1FFF), accessed via two-byte address transmission after the 7-bit slave address (0xA0–0xA7). The A0–A2 pins configure device select bits, allowing up to eight devices on one I²C bus; WP pin enables hardware-level write lock across the full memory map.

Key Specifications

Pinout & Package

Package: 8-pin Small Outline Integrated Circuit (SOIC), 150 mil width, RoHS-compliant, surface-mount.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C512-MAHM-T and FM24V05-G, the CY15B064J-SXA uniquely delivers automotive-qualified endurance, zero-write-latency operation, and full I²C timing compatibility - making it the only option meeting both functional and compliance requirements for ASIL-B adjacent systems.

Availability

CY15B064J-SXA is available at Aetrix Electronics and suitable for automotive body control units, industrial programmable logic controllers, and EV battery management systems requiring stable component supply across extended production lifecycles.

Supply support for CY15B064J-SXA 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

Cypress Semiconductor (now part of Infineon Technologies) designs high-reliability semiconductor solutions for automotive, industrial, and IoT applications, with expertise in nonvolatile memory and microcontroller integration.

The CY15B064J belongs to Cypress's automotive-qualified F-RAM product line, engineered specifically to replace EEPROM in systems demanding rapid, reliable, and low-power nonvolatile data storage under harsh environmental conditions.

FAQ

Is CY15B064J-SXA pin-compatible with standard 8-pin I²C EEPROMs?

Yes. It uses identical SOIC-8 pinout (A0–A2, SDA, SCL, WP, VDD, VSS) and matches the I²C slave address format (0xA0–0xA7), enabling direct PCB-level replacement without layout changes. All control signals and timing adhere to I²C specification v2.1, including START/STOP, ACK/NACK, and clock stretching behavior.

Does CY15B064J-SXA require external pull-up resistors on SDA/SCL?

Yes. SDA and SCL are open-drain outputs requiring external pull-up resistors to VDD. Recommended values are 2.2 kΩ for 100 kHz, 1 kΩ for 400 kHz, and 4.7 kΩ for 1 MHz operation - selected based on bus capacitance and rise-time requirements per I²C specification.

How does the WP pin affect write operations?

When WP is tied to VDD, all memory locations are write-protected; no write commands (including page or sequential writes) will modify data. When WP is grounded, full write access is enabled. Internal pull-down ensures default write-enable state if WP is left unconnected, but automotive designs must tie it explicitly for safety.

What is the maximum supported I²C clock frequency?

The CY15B064J-SXA supports up to 1 MHz (fast-mode plus) with guaranteed timing margins across the full automotive temperature range. At this rate, random-address byte writes complete in ≤11 µs, and sequential reads achieve sustained throughput of ~80 KB/s - verified in production test across –40 °C to +85 °C.