Infineon Technologies CY15B064Q-SXET

Overview

CY15B064Q-SXET from Infineon Technologies (formerly Cypress) is an automotive-grade 64-Kbit serial SPI F-RAM with 8K × 8 organization, 10¹³ read/write endurance, 121-year data retention at +85 °C, and AEC-Q100 Grade 1 qualification (–40 °C to +125 °C). It serves as a hardware-compatible, zero-latency replacement for serial EEPROM and flash in real-time data logging and control systems.

For engineers reviewing the CY15B064Q-SXET datasheet, CY15B064Q-SXET pinout, CY15B064Q-SXET application, or CY15B064Q-SXET equivalent, key selection criteria include NoDelay™ write performance, SPI mode 0/3 compatibility, WP/HOLD pin behavior, SOIC-8 package constraints, and automotive temperature compliance - all critical for deterministic embedded storage in ADAS, powertrain, and body control modules.

Technical Context

The CY15B064Q-SXET implements a ferroelectric memory array accessed via standard SPI protocol with no internal write buffers or erase cycles. Its instruction decoder supports opcodes including WREN, WRDI, RDSR, WRSR, READ, and WRITE, all synchronized to SCK rising/falling edges per SPI modes 0 and 3.

Write protection is implemented through dual-layer control: hardware-level WP pin assertion (active-low, latched when WPEN = 1) and software-configurable block protection (1/4, 1/2, or full array) via the nonvolatile status register. Power management relies solely on VDD monitoring; no internal voltage regulators or brown-out detection are present.

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 nonvolatile serial memory applications.

Compared with AT25DF041A-SSH-T and BR24G64FJ-3GE2, CY15B064Q-SXET delivers 10 million× higher endurance, zero write latency, and automotive-grade reliability - making it the sole choice for applications demanding frequent, time-deterministic nonvolatile writes in harsh environments.

Availability

CY15B064Q-SXET is available at Aetrix Electronics and suitable for ADAS event logging, engine control unit (ECU) calibration storage, and body control module (BCM) state backup requiring stable component supply across extended automotive production lifecycles.

Supply support for CY15B064Q-SXET 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 microcontrollers, and reliable memory solutions for mission-critical systems.

The CY15B064Q-SXET belongs to Infineon's automotive F-RAM product line, engineered specifically for deterministic, high-endurance nonvolatile storage in safety-relevant electronic control units operating across extreme temperature and vibration conditions.

FAQ

Is CY15B064Q-SXET pin-compatible with standard SPI EEPROMs or flash devices in SOIC-8 packages?

Yes - CY15B064Q-SXET uses identical SOIC-8 pinout and SPI command set (WREN, WRITE, READ, RDSR) as industry-standard serial EEPROMs and flash. CS, SCK, SI, SO, WP, and HOLD map directly; no PCB redesign is needed for drop-in replacement in existing layouts.

Does CY15B064Q-SXET require special initialization or firmware drivers beyond standard SPI routines?

No - it operates with standard SPI master peripherals using mode 0 or 3. Only two additional instructions (WREN before WRITE, optional WRSR for block protection) are needed. No erase routines, wear leveling, or status polling loops are required, simplifying driver development and reducing CPU load.

What is the maximum sustained write throughput achievable with CY15B064Q-SXET at 16 MHz SPI clock?

At 16 MHz, each byte write requires one opcode (1 byte) + two address bytes + one data byte = 4 bytes × 8 clocks = 32 clock cycles, or 2 μs minimum. With continuous CS assertion, sustained throughput reaches 500 KB/s - limited only by host controller SPI DMA bandwidth, not device latency.

How does the HOLD pin behave during active memory operations, and what timing constraints apply?

HOLD suspends ongoing SPI transfers immediately upon going LOW while SCK is LOW. The device holds SCK, SI, and CS states, tristates SO, and resumes exactly where interrupted on next SCK edge after HOLD returns HIGH. Transitions must occur only when SCK = LOW to prevent bus contention or metastability.