Infineon Technologies CY14V101QS-SE108XQT

Overview

CY14V101QS-SE108XQT from Cypress Semiconductor is a 1-Mbit (128K × 8) Quad SPI nvSRAM integrating SRAM and SONOS FLASH Quantum Trap nonvolatile storage in a single die. It delivers 108-MHz interface bandwidth, supports SPI/DPI/QPI modes, and operates across –40 °C to 105 °C with AutoStore/RECALL functionality enabled by VCAP capacitor. Used in industrial PLCs for real-time data logging with power-loss resilience.

For engineers reviewing the CY14V101QS-SE108XQT datasheet, CY14V101QS-SE108XQT pinout, CY14V101QS-SE108XQT application, or CY14V101QS-SE108XQT equivalent, key selection criteria include QPI read/write latency, STORE/RECALL timing under voltage droop, VCCQ 1.71–2.0 V I/O compatibility, and HSB-driven hardware STORE triggering in safety-critical systems.

Technical Context

The device implements a dual-array architecture: 128K × 8 SRAM for infinite-cycle volatile access and co-located SONOS Quantum Trap cells for nonvolatile retention. All read/write operations target SRAM; STORE/RECALL transfers occur only during explicit commands or power transitions.

QPI mode enables 4-bit-per-clock data transfer using I/O0–I/O3 pins, supporting burst wrap and XIP-capable continuous read. The HSB pin serves dual role-outputting STORE busy status (LOW active) and accepting external LOW pulse to initiate hardware STORE-enabling deterministic fail-safe data capture without software intervention.

Key Specifications

Pinout & Package

Available in 16-pin SOIC (standard pinout) and 24-ball FBGA packages. Pin functions are mode-dependent: I/O2 (WP) and I/O3 (NC) become active bidirectional data lines only in Quad SPI mode.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar nvSRAM applications.

Compared with FM25V01-G and AT25SF128A-SSHD-B, CY14V101QS-SE108XQT uniquely combines deterministic power-loss STORE, QPI bandwidth, and true SRAM-like access-making it optimal for real-time data buffering where both speed and fail-safe persistence are mandatory.

Availability

CY14V101QS-SE108XQT is available at Aetrix Electronics and suitable for industrial data loggers, automotive ADAS ECUs, medical infusion pumps, and smart grid RTUs requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for CY14V101QS-SE108XQT 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 memory and programmable system-on-chip solutions for industrial, automotive, and communications markets.

The CY14V101QS belongs to Cypress' nvSRAM product line, engineered specifically for applications demanding instantaneous nonvolatile storage without battery backup or complex firmware management.

FAQ

What is the minimum VCAP capacitance required for reliable AutoStore operation?

The datasheet specifies a typical 4.7 µF tantalum or ceramic capacitor on VCAP, with minimum recommended value of 2.2 µF. Capacitor ESR must be ≤ 1 Ω to ensure sufficient energy delivery during VCC dropout events lasting up to 20 ms. Lower capacitance may cause incomplete STORE under worst-case voltage ramp rates.

Can CY14V101QS-SE108XQT operate in standard SPI mode without enabling QPI?

Yes-it supports SPI Mode 0 and Mode 3 at up to 40 MHz with zero-cycle latency, using only SI, SO, SCK, and CS pins. WP and NC pins remain unused in this configuration. QPI mode must be explicitly enabled via QPIEN instruction and is not default on power-up.

How does the HSB pin function during a Software STORE operation?

During Software STORE, HSB goes LOW immediately upon command acceptance and remains LOW until STORE completion (typically 10–15 ms). It then pulses HIGH for tHHHD (≥100 ns), followed by weak internal pull-up. This behavior allows host MCU to poll HSB instead of relying on fixed timeout delays.

Is the 8-byte serial number field truly one-time programmable?

Yes-the serial number register is implemented as OTP fuses. Once written via WRSN instruction, the value cannot be altered. Programming requires VCC ≥ 2.9 V and execution of the WRSN command with proper write enable sequence; no erase capability exists.