Infineon Technologies CY15B064Q-SXAT

Overview

CY15B064Q-SXAT from Cypress Semiconductor is a 64-Kbit (8K × 8) serial SPI F-RAM with automotive-grade temperature range (–40 °C to +85 °C), 20 MHz max clock frequency, NoDelay™ write capability, and 10¹⁴ read/write endurance. It serves as nonvolatile memory in real-time data logging systems where rapid, frequent writes must be preserved without wear-out or polling delays.

For engineers reviewing the CY15B064Q-SXAT datasheet, CY15B064Q-SXAT pinout, CY15B064Q-SXAT application, or CY15B064Q-SXAT equivalent, key selection criteria include guaranteed automotive-A operation, hardware/software write protection, SPI mode 0/3 compatibility, and direct drop-in replacement capability for serial EEPROM or flash in high-cycle data capture systems.

Technical Context

The CY15B064Q-SXAT implements ferroelectric memory array architecture enabling true RAM-like write behavior - data commits immediately after each byte transfer with zero latency and no internal write cycle overhead. Its instruction decoder and status register support configurable block protection (1/4, 1/2, or full array) via WP pin and WRSR command.

It operates as an SPI slave device with dual-mode clock polarity/phase support (CPOL=0/CPHA=0 and CPOL=1/CPHA=1), uses MSB-first 2-byte addressing (13-bit effective), and requires no power management circuitry beyond internal POR - VDD regulation is system-responsible per datasheet tolerances (2.7 V to 3.65 V).

Key Specifications

Pinout & Package

8-pin SOIC (Small Outline Integrated Circuit) package, RoHS-compliant, surface-mountable with standard reflow profile.

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-SSH-T, the CY15B064Q-SXAT uniquely balances automotive qualification, zero-write-latency, and 64-Kbit density in SOIC-8 - making it optimal for space-constrained, high-cycle automotive data buffers where flash and EEPROM fail.

Availability

CY15B064Q-SXAT is available at Aetrix Electronics and suitable for telematics event logging, ADAS sensor calibration storage, and engine control unit fault history requiring stable component supply across automotive production lifecycles.

Supply support for CY15B064Q-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 focus on nonvolatile memory, PSoC, and connectivity.

The CY15B064Q belongs to Cypress' automotive-qualified F-RAM product line, engineered specifically to replace serial EEPROM and flash in applications demanding infinite endurance, instant writes, and extended temperature operation.

FAQ

Is CY15B064Q-SXAT pin-compatible with standard SPI EEPROMs like AT25xxx series?

Yes - it uses identical 8-pin SOIC footprint and SPI command set (WREN, WRITE, READ, RDSR), enabling direct hardware replacement. However, it omits erase commands and does not require polling, simplifying firmware integration while maintaining identical PCB layout.

Does CY15B064Q-SXAT require external high-voltage programming or special write sequences?

No - it performs true single-supply writes at VDD (2.7–3.65 V) with no charge pumps or erase cycles. A standard SPI WRITE command writes data immediately; no additional timing constraints, voltage boosting, or command chaining is needed.

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

When HOLD is pulled LOW during any SPI transaction, the device suspends communication immediately - SCK and CS are ignored, and SO enters high-impedance. The internal address counter and state machine retain position; resuming HOLD HIGH restores operation from the exact suspended point.

Can CY15B064Q-SXAT be used in SPI mode 1 or 2?

No - it supports only SPI modes 0 (CPOL=0, CPHA=0) and 3 (CPOL=1, CPHA=1). Attempting mode 1 or 2 results in incorrect data sampling because input latching occurs only on rising SCK edges, per datasheet timing specifications.