Infineon Technologies CY15B104Q-LHXI

Overview

CY15B104Q-LHXI 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 up to 40 MHz over 2.0–3.6 V and supports SPI modes 0 and 3. Used in industrial data logging where rapid, reliable byte-level writes are critical.

For engineers reviewing the CY15B104Q-LHXI datasheet, CY15B104Q-LHXI pinout, CY15B104Q-LHXI application, or CY15B104Q-LHXI equivalent, key selection criteria include write latency independence from bus speed, hardware/software write protection granularity, industrial temperature operation (–40°C to +85°C), and drop-in compatibility with serial flash/EEPROM footprints.

Technical Context

The CY15B104Q-LHXI implements a ferroelectric memory array accessed via standard SPI protocol with no internal write cycles or polling required. Its status register controls block protection (1/4, 1/2, or full array) and write-enable latch behavior, while Device ID provides manufacturer and product revision identification.

It features dual active-low control pins-WP for hardware status register lock and HOLD for transaction suspension-with all I/O synchronized to SCK rising/falling edges per SPI mode 0/3 timing. The 19-bit address space maps to 512 K × 8 logical organization, with upper 5 address bits ignored.

Key Specifications

Pinout & Package

Available in 8-pin SOIC and 8-pin TDFN packages; both are RoHS-compliant surface-mount formats with exposed pad (TDFN only, NC).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT45DB041E-SSU and M95M04-DRMN6TP/K, CY15B104Q-LHXI delivers true RAM-like write concurrency, 100× higher endurance, and 4× faster interface speed-making it the sole option for deterministic, high-cycle nonvolatile storage in real-time systems.

Availability

CY15B104Q-LHXI is available at Aetrix Electronics and suitable for industrial data loggers, smart metering systems, PLC I/O modules, and medical diagnostic equipment requiring stable component supply and guaranteed long-term availability.

Supply support for CY15B104Q-LHXI 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 industrial, automotive, and IoT applications with emphasis on embedded systems integration.

CY15B104Q belongs to Cypress's F-RAM product line, engineered specifically to replace serial flash and EEPROM in applications demanding unlimited write endurance, instant writes, and extended data retention without backup power.

FAQ

Is CY15B104Q-LHXI pin-compatible with standard 8-pin SOIC serial flash devices?

Yes-CY15B104Q-LHXI shares identical 8-pin SOIC and TDFN footprints and SPI signal mapping (CS, SCK, SI, SO, WP, HOLD, VDD, VSS) with common serial flash parts like SST25VF040B and AT25DF041. No PCB redesign is needed for drop-in replacement, though firmware must disable polling and adjust timing for NoDelay™ writes.

Does CY15B104Q-LHXI require external high-voltage programming circuitry?

No-CY15B104Q-LHXI performs all writes at standard VDD levels (2.0–3.6 V) with no charge pump or elevated voltage generation. Unlike EEPROM or flash, it uses ferroelectric polarization switching, eliminating need for external VPP supplies or complex programming algorithms.

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

When HOLD is pulled LOW during a write, the device suspends the current transaction immediately-retaining address and opcode state-and ignores further SCK and CS activity. Upon returning HOLD to HIGH (while SCK is LOW), the operation resumes from the exact point of suspension, ensuring atomicity without data loss or corruption.

Can the WP pin protect only the status register, or does it also guard memory array writes?

The WP pin exclusively protects writes to the status register when WPEN = 1. Memory array writes remain enabled unless disabled via software (WREN + WRSR) or hardware block protection bits. This separation allows secure configuration locking while permitting runtime data updates-a key advantage over monolithic write-protect schemes.