Infineon Technologies CY15B104Q-LHXIT

Overview

CY15B104Q-LHXIT from Cypress Semiconductor is a 4-Mbit (512 K × 8) serial SPI ferroelectric RAM (F-RAM) nonvolatile memory, functioning as a drop-in hardware replacement for serial flash and EEPROM in embedded data-logging and industrial control systems. It delivers NoDelay™ writes at up to 40 MHz, supports 10¹⁴ read/write cycles, retains data for 151 years, and operates across –40 °C to +85 °C with V_DD = 2.0–3.6 V.

For engineers reviewing the CY15B104Q-LHXIT datasheet, CY15B104Q-LHXIT pinout, CY15B104Q-LHXIT application, or CY15B104Q-LHXIT equivalent, key selection criteria include write endurance, zero-write-latency operation, SPI mode 0/3 compatibility, hardware/software write protection, and industrial-grade temperature stability - all critical for high-cycle data acquisition and real-time control.

Technical Context

The CY15B104Q-LHXIT implements an SPI slave interface with synchronous full-duplex communication using dedicated SI and SO pins, supporting both Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1). Its internal logic includes a 19-bit address counter, 3-bit opcode decoder, and nonvolatile status register controlling block protection and WPEN.

Write operations execute immediately upon byte transfer completion-no polling or delay required-due to ferroelectric memory cell architecture. The device uses a single 3-byte address field (with upper 5 bits ignored), enabling direct byte-level access across the full 512 K × 8 array without page programming or erase cycles.

Key Specifications

Pinout & Package

Package: 8-pin TDFN (3 mm × 2 mm, exposed pad floating), RoHS-compliant, industrial temperature grade.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MB85RS4MT-FPN-G-JNE1 and AT45DB321E-SHN-B, CY15B104Q-LHXIT uniquely combines 40 MHz SPI with Mode 0/3 flexibility, HOLD pin support, and true zero-latency writes - making it the only option for deterministic, high-frequency, power-loss-resilient data capture in industrial and medical edge nodes.

Availability

CY15B104Q-LHXIT is available at Aetrix Electronics and suitable for smart energy metering, industrial PLC data logging, and medical diagnostic equipment requiring stable component supply, long-term lifecycle assurance, and guaranteed industrial temperature performance.

Supply support for CY15B104Q-LHXIT 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 nonvolatile memory, microcontrollers, and analog ICs.

The CY15B series targets applications demanding extreme write endurance and deterministic timing - specifically engineered for industrial data acquisition, automotive black boxes, and medical devices where flash/EEPROM limitations cause reliability or firmware complexity issues.

FAQ

Is CY15B104Q-LHXIT pin-compatible with standard 8-pin SOIC SPI flash devices?

No - while CY15B104Q-LHXIT shares the same 8-pin SOIC footprint as many SPI flash devices, its pinout differs: SO and SI are separate (not shared), and it includes dedicated HOLD and WP pins not present in basic SPI flash. The TDFN variant (LHXIT) has identical pin functions but different physical layout. Direct PCB replacement requires layout revision.

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

No - unlike EEPROM or flash, CY15B104Q-LHXIT performs all writes at standard V_DD (2.0–3.6 V) with no charge pump or elevated voltage generation. Write operations use only the supplied V_DD, eliminating need for external HV circuitry, reducing BOM count, and simplifying power design.

Can the HOLD pin be left unconnected in a low-pin-count design?

No - the HOLD pin must be tied to V_DD if unused, per datasheet requirement. Leaving it floating may cause undefined behavior during noise events or power transitions, potentially suspending active memory operations unpredictably and corrupting data transfers.

What is the maximum achievable sustained write bandwidth for CY15B104Q-LHXIT?

At 40 MHz SPI clock with standard 8-bit opcodes and 3-byte addresses, sustained write throughput reaches ~4.7 MB/s (40 MHz ÷ 8 bits × 1 byte per transaction). Real-world performance depends on host overhead, but zero-latency writes eliminate inter-byte delays - enabling continuous streaming without gaps or retries.