Infineon Technologies CY15B104Q-SXI

Overview

CY15B104Q-SXI from Cypress Semiconductor is a 4-Mbit (512 K × 8) serial SPI F-RAM nonvolatile memory with NoDelay™ writes, 10¹⁴ read/write endurance, and 151-year data retention. It operates at 2.0–3.6 V over –40 °C to +85 °C and delivers true bus-speed writes up to 40 MHz-replacing serial EEPROM/flash in data-logging and industrial control systems where rapid, reliable nonvolatile storage is critical.

For engineers reviewing the CY15B104Q-SXI datasheet, CY15B104Q-SXI pinout, CY15B104Q-SXI application, or CY15B104Q-SXI equivalent, key selection criteria include write latency independence from data size, hardware/software write protection granularity (1/4, 1/2, full array), SPI mode 0/3 compatibility, and low active current (300 µA @ 1 MHz) for power-constrained embedded designs.

Technical Context

The CY15B104Q-SXI implements a ferroelectric memory array accessed via standard SPI protocol with opcode-driven command structure. It supports dual SPI modes (0 and 3), uses rising-edge input sampling and falling-edge output timing, and requires no polling due to zero-latency write completion synchronized to SCK edges.

Its internal architecture includes a 3-byte address register (19-bit effective), 8-bit nonvolatile status register controlling write protection, and dedicated hardware pins (WP, HOLD) for real-time operation suspension and write lockout. The device ID provides manufacturer and product revision identification via dedicated read instruction.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (Small Outline Integrated Circuit), 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 FM25V04-G and AT25SF041-SSHD-B, the CY15B104Q-SXI uniquely delivers 40 MHz write throughput, 2.0 V minimum operation, and 151-year retention-making it optimal for ultra-high-write-frequency, wide-voltage, and mission-critical retention applications.

Availability

CY15B104Q-SXI is available at Aetrix Electronics and suitable for industrial data logging, smart metering, automotive telematics, and medical diagnostic equipment requiring stable component supply across extended product lifecycles.

Supply support for CY15B104Q-SXI 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 embedded systems, with expertise in memory, microcontrollers, and programmable logic.

The CY15B104Q belongs to Cypress's F-RAM product line, engineered specifically to replace serial EEPROM and flash in applications demanding infinite endurance, instant writes, and guaranteed data retention without complex firmware overhead.

FAQ

Is CY15B104Q-SXI pin-compatible with standard 8-pin SPI flash or EEPROM devices?

Yes-CY15B104Q-SXI uses identical 8-pin SOIC pinout and SPI command set (including WREN, WRITE, READ, RDSR) as industry-standard serial flash and EEPROM. Hardware replacement requires no PCB changes, though firmware must disable polling loops due to NoDelay™ writes.

Does CY15B104Q-SXI require external high-voltage programming or erase pulses?

No-unlike flash or EEPROM, CY15B104Q-SXI performs all writes at standard VDD levels (2.0–3.6 V) with no erase cycle, no high-voltage charge pumps, and no sector/page management. Each byte is written directly and immediately upon receipt.

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

When HOLD is pulled LOW during a write, the device suspends the transaction after the current byte completes, holds SCK and data lines stable, and ignores further SCK edges until HOLD returns HIGH-enabling deterministic CPU task preemption without data corruption or retry logic.

Can CY15B104Q-SXI operate reliably at 2.0 V while maintaining 40 MHz SPI performance?

Yes-the datasheet guarantees full 40 MHz operation down to 2.0 V. At this voltage, t_CLK remains ≤25 ns, setup/hold times are met, and active current is 300 µA @ 1 MHz, enabling robust low-voltage, high-speed operation in battery-powered edge devices.