Infineon Technologies CY15E064Q-SXAT

Overview

CY15E064Q-SXAT 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 state storage.

For engineers reviewing the CY15E064Q-SXAT datasheet, CY15E064Q-SXAT pinout, CY15E064Q-SXAT application, or CY15E064Q-SXAT equivalent, key selection criteria include SPI mode 0/3 compatibility, WP/HOLD pin behavior, VDD = 4.5–5.5 V operation, SOIC-8 package constraints, and absence of write polling overhead in time-critical embedded firmware.

Technical Context

The CY15E064Q-SXAT implements a ferroelectric memory array with zero-latency writes: each byte is committed immediately upon successful SPI transfer without internal write cycles or status polling. Its instruction decoder supports standard opcodes (WREN, WRDI, RDSR, WRSR, READ, WRITE) and interprets upper address bits as "don't care" due to 13-bit addressing.

Write protection is implemented via dual-layer control: hardware-level WP pin assertion (when WPEN = 1) blocks Status Register modification, while software-configurable block protection (1/4, 1/2, or full array) is set via WRSR. The device operates exclusively as an SPI slave with synchronous I/O timing referenced to SCK rising/falling edges per modes 0 and 3.

Key Specifications

Pinout & Package

8-pin Small Outline Integrated Circuit (SOIC) package with standard gull-wing leads, RoHS-compliant, 150 mil body width, and 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-SH-B, CY15E064Q-SXAT uniquely balances 5 V compatibility, automotive temperature range, and true zero-latency writes - making it optimal for legacy 5 V ECU designs where firmware cannot accommodate flash erase delays or voltage translation.

Availability

CY15E064Q-SXAT is available at Aetrix Electronics and suitable for telematics data logging, engine control unit state backup, and ADAS camera configuration requiring stable component supply across automotive production lifecycles.

Supply support for CY15E064Q-SXAT 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 embedded memory and programmable systems.

CY15E064Q belongs to Cypress's automotive-qualified F-RAM product line, engineered specifically to replace serial EEPROM/flash in safety-critical, high-write-frequency automotive subsystems where data integrity and deterministic timing are mandatory.

FAQ

Is CY15E064Q-SXAT pin-compatible with standard 8-pin SOIC serial EEPROMs?

Yes - CY15E064Q-SXAT uses identical SOIC-8 pinout (CS, SCK, SI, SO, WP, HOLD, VSS, VDD) and supports same SPI opcodes as industry-standard serial EEPROMs like AT25xxx and CAT25xxx families. No PCB redesign is needed for drop-in replacement, though firmware must disable write polling routines due to NoDelay™ operation.

Does CY15E064Q-SXAT require external high-voltage programming circuitry?

No - unlike EEPROM or flash, CY15E064Q-SXAT performs writes at standard VDD (4.5–5.5 V) with no charge pump or high-voltage generator. All operations use single-supply 5 V logic levels, simplifying power design and eliminating HV-related layout constraints or reliability concerns.

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

When HOLD is asserted LOW during a write, the device suspends the ongoing byte transfer immediately - latching the partially written byte and holding SCK, SI, and SO states. Upon HOLD return to HIGH (while SCK is LOW), the device resumes exactly where it left off, completing the write without data corruption or retransmission requirement.

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

No - CY15E064Q-SXAT 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 2 will result in incorrect data sampling due to mismatched SCK edge alignment for SI/SO timing.