Infineon Technologies CY15B104QSN-108BFXI

Overview

CY15B104QSN-108BFXI from Infineon is a 4 Mb serial quad SPI ferroelectric RAM (F-RAM) organized as 512K × 8, operating at up to 108 MHz SDR and supporting industrial temperature range (–40°C to +85°C), 1.8 V to 3.6 V supply, and 100 trillion (10¹⁴) read/write cycles - deployed in real-time data logging systems requiring deterministic non-volatile writes without write latency.

For engineers reviewing the CY15B104QSN-108BFXI datasheet, CY15B104QSN-108BFXI pinout, CY15B104QSN-108BFXI application, or CY15B104QSN-108BFXI equivalent, key selection criteria include guaranteed 108 MHz quad SPI timing, on-die ECC for 1-bit correction per 8-byte unit, hardware write protection via WP pin, and compatibility with standard SOIC-8 PCB footprints in industrial control and metering designs.

Technical Context

The device implements a true RAM-like interface over quad SPI (QPI) with no write latency - data commits instantly upon byte transfer completion, eliminating polling and enabling deterministic execution-in-place (XIP) reads/writes. It supports both SDR (up to 108 MHz) and DDR (up to 54 MHz) modes, with configurable latency codes (MLC/RLC) and dual/quad I/O protocols.

Internally, it integrates dedicated 256-byte special sector F-RAM surviving three reflow cycles, dual status/configuration registers (SR1/SR2, CR1–CR5), and hardware-assisted integrity features: CRC for array-level data verification and ECC that detects/corrects 1-bit errors while flagging 2-bit errors in each 8-byte block.

Key Specifications

Pinout & Package

Supplied in an 8-pin SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch), compatible with standard surface-mount assembly and IPC-7351B land patterns.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar non-volatile serial memory applications.

Compared with CY15B104QSN-108BFXI, the -108BFXIT offers identical performance in reel packaging for SMT lines, while FM25V04-G trades speed, interface flexibility, and on-die data integrity for lower cost and simpler integration in legacy designs.

Availability

CY15B104QSN-108BFXI is available at Aetrix Electronics and suitable for industrial data loggers, smart electricity meters, PLC I/O modules, and medical sensor hubs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for CY15B104QSN-108BFXI 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 German semiconductor leader specializing in power management, automotive ICs, and high-reliability memory solutions, with global manufacturing and quality certification to ISO/TS 16949 and IATF 16949.

CY15B104QSN belongs to the EXCELON™ Ultra F-RAM product line, engineered specifically for industrial and metering applications demanding extreme endurance, zero-write-latency non-volatility, and embedded data integrity - not general-purpose memory.

FAQ

Does CY15B104QSN-108BFXI support execute-in-place (XIP) operation?

Yes, the device supports XIP for memory reads and writes, allowing code or lookup tables stored in F-RAM to be executed directly by the host processor without copying to RAM. This reduces boot time and simplifies memory mapping in resource-constrained microcontrollers, and is enabled by its true RAM-like random access behavior and lack of erase/write latency.

What is the purpose of the dedicated 256-byte special sector F-RAM?

The dedicated 256-byte special sector retains data through up to three standard lead-free reflow cycles (JEDEC J-STD-020), making it ideal for storing post-assembly calibration constants, firmware version stamps, or cryptographic keys that must persist after PCB rework. It is accessed using separate commands (RDSFR, WRSFR) and is physically isolated from main array wear mechanisms.

How does the on-die ECC differ from standard Hamming code implementations?

This device implements a proprietary on-die ECC that corrects any single-bit error within each 8-byte data unit and reports uncorrectable 2-bit errors via the ECC status register (SR2[1]). Unlike generic Hamming codes, it operates transparently during read cycles with no CPU overhead, requires no external syndrome calculation, and is tightly integrated with the internal read path to guarantee sub-100 ns correction latency.

Can the RESET pin be repurposed as a general-purpose I/O in quad SPI mode?

Yes - when the IO3R bit (CR2[5]) is set to '1', the RESET pin functions exclusively as I/O3 in quad SPI mode and loses its reset capability. This allows full utilization of all four I/O lines for maximum bandwidth, provided the system implements alternative reset management (e.g., via watchdog or power-on reset IC), and is confirmed in Section 4.2.2.2 of the official datasheet.