Infineon Technologies CY15E064Q-SXA

Overview

CY15E064Q-SXA from Cypress Semiconductor is a 64-Kbit (8K × 8) serial SPI F-RAM nonvolatile memory with automotive-grade qualification (–40 °C to +85 °C), 20 MHz max SPI clock, NoDelay™ write capability, 10¹⁴ read/write endurance, and 151-year data retention. It serves as a hardware-compatible replacement for serial EEPROM/flash in real-time data logging and control systems where rapid, reliable nonvolatile writes are critical.

For engineers reviewing the CY15E064Q-SXA datasheet, CY15E064Q-SXA pinout, CY15E064Q-SXA application, or CY15E064Q-SXA equivalent, key selection factors include SPI mode 0/3 compatibility, WP/HOLD pin behavior, 4.5–5.5 V operation, SOIC-8 packaging, and absence of write polling - all confirmed in the official Cypress datasheet (002-10237 Rev. *B).

Technical Context

The CY15E064Q-SXA implements a ferroelectric memory array with zero-latency write architecture: each byte is committed immediately upon successful SPI transfer without internal write cycles or status polling. Its instruction decoder supports standard SPI opcodes (WREN, WRDI, RDSR, WRSR, READ, WRITE) and enforces hardware/software write protection via WP pin and Status Register bits.

It operates exclusively as an SPI slave in Mode 0 (CPOL=0, CPHA=0) or Mode 3 (CPOL=1, CPHA=1), with inputs latched on rising SCK edges and outputs driven on falling edges. Addressing uses 13-bit byte addresses (upper 3 bits ignored), enabling full 8K × 8 access with two-byte address fields in all read/write commands.

Key Specifications

Pinout & Package

8-pin Small Outline Integrated Circuit (SOIC) package with standard gull-wing leads, RoHS-compliant, 150 mil body width, 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with FM25V05-G and AT25DF041A-SSHN-B, CY15E064Q-SXA uniquely delivers 5 V operation, automotive-A qualification, and true zero-latency writes - making it the sole choice for high-frequency 5 V data logging in harsh environments.

Availability

CY15E064Q-SXA is available at Aetrix Electronics and suitable for telematics event logging, engine control unit parameter storage, and industrial PLC configuration backup requiring stable component supply across extended automotive and industrial lifecycles.

Supply support for CY15E064Q-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 emphasis on low-power, nonvolatile, and interface-optimized devices.

The CY15E064Q-SXA belongs to Cypress's automotive-qualified F-RAM product line, engineered specifically to replace serial EEPROM and flash in applications demanding frequent, deterministic, and energy-efficient nonvolatile writes.

FAQ

Is CY15E064Q-SXA pin-compatible with standard SPI EEPROMs like AT25xxx series?

Yes - CY15E064Q-SXA uses identical SOIC-8 pinout and SPI command set (READ, WRITE, WREN, etc.) as industry-standard serial EEPROMs, enabling drop-in replacement without PCB redesign. However, its WP and HOLD pins behave differently: WP only protects the Status Register (not full array), and HOLD suspends mid-transaction rather than resetting the command sequence.

Does CY15E064Q-SXA require external circuitry for 5 V operation?

No - CY15E064Q-SXA operates natively from 4.5 V to 5.5 V with no level-shifting or voltage regulation needed. Its I/Os are 5 V-tolerant and fully compatible with legacy microcontrollers such as PIC18F, STM32F0xx, and Renesas RL78, provided VDD remains within specification and decoupling capacitors (0.1 µF ceramic + 4.7 µF tantalum) are placed near VDD/VSS pins.

How does the HOLD pin function during an active write operation?

When HOLD is asserted LOW during a write, the CY15E064Q-SXA immediately suspends data latching and address incrementing, holding the internal state intact. SCK and CS are ignored until HOLD returns HIGH while SCK is LOW; then the transaction resumes from the exact bit position where it paused - no data loss or corruption occurs, and no retransmission is needed.

Can CY15E064Q-SXA be used in SPI Mode 1 or Mode 2 configurations?

No - CY15E064Q-SXA explicitly supports only SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1), as confirmed in the functional description and AC timing tables. Attempting Mode 1 or Mode 2 will result in misaligned sampling (inputs latched on wrong clock edge) and corrupted reads/writes; firmware must configure the host SPI peripheral accordingly.