Infineon Technologies CY14B101Q1A-SXIT

Overview

CY14B101Q1A-SXIT from Infineon Technologies (formerly Cypress) is a 1-Mbit serial SPI nonvolatile SRAM (nvSRAM), organized as 128K × 8, operating at 2.7–3.6 V and supporting 40 MHz SPI read/write with zero cycle delay. It implements QuantumTrap nonvolatile storage for data retention up to 20 years at 85 °C and enables Software STORE/RECALL via SPI instructions. It is used in industrial control systems requiring instant power-loss data preservation without external capacitor support.

For engineers reviewing the CY14B101Q1A-SXIT datasheet, CY14B101Q1A-SXIT pinout, CY14B101Q1A-SXIT application, or CY14B101Q1A-SXIT equivalent, key selection criteria include absence of AutoStore (no VCAP pin), SPI mode 0/3 compatibility, hardware write protection via WP pin, and 8-pin SOIC footprint for space-constrained embedded logging modules.

Technical Context

The CY14B101Q1A-SXIT integrates SRAM and QuantumTrap nonvolatile cells per bit, enabling infinite SRAM read/write cycles while limiting STORE endurance to 1 million cycles. Unlike CY14X101Q2A/Q3A, it omits both VCAP and HSB pins - confirming no AutoStore or Hardware STORE capability.

SPI interface supports dual-speed operation: standard READ/WRITE at ≤40 MHz with zero latency, and FAST_READ at up to 104 MHz using a dummy byte. Status register (RDSR/WRSR) controls block protection (1/4, 1/2, full array) and write enable/disable states, with WP pin providing hardware-level write lock independent of software state.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (Small Outline Integrated Circuit), RoHS-compliant, surface-mountable with 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY14B101Q2A-SXIT, this part removes VCAP dependency but forfeits automatic power-loss protection; compared with FM25V01-G, it trades infinite write endurance for deterministic QuantumTrap retention and lower cost per bit in burst-write scenarios.

Availability

CY14B101Q1A-SXIT is available at Aetrix Electronics and suitable for industrial PLC data logging, medical event recording, smart meter parameter storage, and automotive BCM configuration requiring stable component supply over extended production lifecycles.

Supply support for CY14B101Q1A-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

Infineon Technologies acquired Cypress Semiconductor in 2020 and maintains its nvSRAM portfolio with full technical and supply chain continuity.

This device belongs to the CY14X101Q nvSRAM product line, designed specifically for applications needing fast, reliable, capacitor-free nonvolatile storage in SPI-constrained embedded systems.

FAQ

Does CY14B101Q1A-SXIT support AutoStore?

No. The "1A" suffix explicitly denotes absence of AutoStore functionality and the VCAP pin. Power-loss data retention requires explicit Software STORE instruction before voltage collapse. This eliminates capacitor sizing, placement, and aging concerns in compact designs but shifts responsibility for power-fail detection to the host MCU.

What is the purpose of the HOLD pin?

The HOLD pin suspends ongoing SPI communication without resetting internal state or losing command context. When asserted low, it freezes SCK sampling and SO output, allowing the host to service higher-priority interrupts and resume the exact same transaction afterward - critical for deterministic real-time systems with tight timing budgets.

Can the WP pin override software write protection?

Yes. The WP pin provides hardware-level write lock: when pulled low, it disables all write operations (including STORE, WRITE, WRSR) regardless of status register settings or WREN state. This hardwired safety feature prevents firmware bugs or malware from corrupting protected memory regions, meeting IEC 62443 functional safety requirements.

Is FAST_READ supported on CY14B101Q1A-SXIT?

Yes. FAST_READ instruction enables 104 MHz SPI read access using a dummy byte, doubling throughput versus standard READ. This is fully supported in CY14B101Q1A-SXIT and requires no additional hardware - only correct opcode (0x0B) and timing compliance per AC switching specs in Rev. *N datasheet.