Infineon Technologies CY15B104Q-SXIT

Overview

CY15B104Q-SXIT 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, supports 40-MHz SPI (modes 0 and 3), and replaces serial flash/EEPROM in high-write-cycle industrial logging systems.

For engineers reviewing the CY15B104Q-SXIT datasheet, CY15B104Q-SXIT pinout, CY15B104Q-SXIT application, or CY15B104Q-SXIT equivalent, key selection criteria include write latency independence from bus speed, hardware/software write protection granularity (1/4, 1/2, full array), Device ID verification capability, and TDFN-8/SOIC-8 package compatibility with legacy footprint designs.

Technical Context

The CY15B104Q-SXIT implements a ferroelectric memory array accessed via standard SPI protocol with no internal write cycle delays-data commits immediately after byte transfer without polling. Its status register controls WPEN, BP0/BP1 block protection bits, and WEL latch state, enabling deterministic timing for real-time data capture.

It features dual SPI mode support (0 and 3), 19-bit address decoding (upper 5 bits ignored), and dedicated HOLD/CS/WP pins for deterministic bus arbitration and hardware-level write inhibition. The SO pin remains high-impedance during non-read states, including HOLD assertion, ensuring clean bus isolation.

Key Specifications

Pinout & Package

Package: 8-pin TDFN (3 mm × 2 mm, exposed pad not connected) and 8-pin SOIC (300 mil). Both packages share identical pin mapping and electrical behavior.

Key Features

Applications

Equivalent & Alternatives

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

Compared with FM25V04-G and AT45DB041E, CY15B104Q-SXIT uniquely delivers industrial-voltage flexibility, deterministic HOLD-based bus arbitration, and 10⁹× higher endurance-making it the sole choice for real-time, high-frequency, mission-critical logging.

Availability

CY15B104Q-SXIT is available at Aetrix Electronics and suitable for industrial data loggers, smart metering systems, and automotive telematics requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.

Supply support for CY15B104Q-SXIT 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.

The CY15B104Q belongs to Cypress's F-RAM product line, engineered specifically to replace serial flash and EEPROM in applications demanding rapid, unlimited, and low-power nonvolatile writes.

FAQ

What is the function of the HOLD pin during an active read operation?

The HOLD pin suspends the current read operation when pulled LOW while SCK is LOW. The device retains its internal address counter and SO remains in high-impedance state. Upon release (HOLD HIGH), the read resumes from the suspended byte position without reissuing CS or opcode-enabling seamless host CPU task preemption without data loss or restart overhead.

How does the CY15B104Q-SXIT handle invalid opcodes received on the SI pin?

When an invalid opcode is detected, the device ignores the opcode and all subsequent SI data until the next falling edge of CS. The SO pin remains in high-impedance state throughout, preventing bus contention. No status flag is set, and the internal state (address counter, WEL latch) remains unchanged-ensuring robust recovery from communication errors without firmware intervention.

Can the SI and SO pins be shorted for single-wire SPI emulation?

Yes-SI and SO may be connected together to implement a 3-wire SPI interface (CS, SCK, shared I/O), provided the host controller uses open-drain or tri-state drivers and manages direction control in software. This configuration reduces PCB routing complexity but limits simultaneous full-duplex operation and requires careful timing alignment per the "Three-Wire SPI" section of the datasheet.

Is the EXPOSED PAD on the TDFN package electrically connected?

No-the EXPOSED PAD on the 8-pin TDFN package is not connected to the die or any internal circuitry. It must be left floating or optionally grounded for mechanical stability only; connecting it to VDD or VSS risks latch-up or parametric shift. Cypress explicitly states it is a no-connect feature with no thermal or electrical role in standard operation.