Infineon Technologies CY14V101Q3-SFXIT

Overview

CY14V101Q3-SFXIT from Cypress Semiconductor is a 1 Mbit (128 K × 8) serial SPI nonvolatile SRAM with integrated QuantumTrap SONOS nonvolatile storage, supporting AutoStore on power-down, Hardware STORE via HSB pin, and Software STORE/RECALL via SPI instructions. It operates at up to 30 MHz SPI clock, features dual supply (VCC = 3.0–3.6 V, VCCQ = 1.65–1.95 V), and delivers infinite SRAM write cycles with 1 million STORE endurance and 20-year data retention. Used in industrial logging systems requiring deterministic power-loss data capture.

For engineers reviewing the CY14V101Q3-SFXIT datasheet, CY14V101Q3-SFXIT pinout, CY14V101Q3-SFXIT application, or CY14V101Q3-SFXIT equivalent, key selection criteria include AutoStore capacitor timing (tSTORE = 15 ms max), SPI mode 0/3 compatibility, hardware write protection via WP pin, and VCAP pin biasing requirements for reliable nonvolatile backup.

Technical Context

The CY14V101Q3-SFXIT integrates SRAM and QuantumTrap nonvolatile cells per bit using SONOS technology, enabling parallel STORE/RECALL without external controllers. Its SPI interface supports zero-cycle-delay reads/writes and dedicated opcodes for STORE, RECALL, ASENB, and ASDISB - distinguishing it from standard EEPROM or FRAM.

STORE operations are conditional: AutoStore and Hardware STORE require at least one prior SRAM write since last RECALL; Software STORE executes unconditionally. Busy status is signaled simultaneously via HSB pin (active-low open-drain) and RDY bit in status register, ensuring deterministic system-level synchronization.

Key Specifications

Pinout & Package

Package: 16-pin Small Outline Integrated Circuit (SOIC), RoHS-compliant, industrial temperature grade.

Key Features

Applications

Equivalent & Alternatives

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

Compared with FM25V01-G and AT25SF041-SSHD-B, CY14V101Q3-SFXIT uniquely balances deterministic power-loss response (via VCAP-based AutoStore), infinite SRAM writes, and SPI simplicity - making it optimal for industrial systems where data integrity during unpredictable brownouts is non-negotiable.

Availability

CY14V101Q3-SFXIT is available at Aetrix Electronics and suitable for industrial data loggers, smart electricity meters, railway signaling controllers, and programmable logic controllers requiring stable component supply and long-term lifecycle support.

Supply support for CY14V101Q3-SFXIT 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 solutions for industrial, automotive, and IoT applications.

The CY14V series was developed specifically for mission-critical industrial systems needing battery-free, deterministic nonvolatile storage with SRAM speed - addressing limitations of EEPROM, Flash, and battery-backed SRAM.

FAQ

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

The CY14V101Q3-SFXIT requires a minimum 4.7 µF tantalum or ceramic capacitor on the VCAP pin to ensure sufficient charge for a full 15 ms STORE cycle at worst-case VCC dropout slope and temperature. Datasheet section "Capacitance" specifies 4.7 µF ±20% with ESR < 1 Ω; undersized capacitors cause incomplete STORE and data corruption.

Can the CY14V101Q3-SFXIT operate with VCCQ = 1.8 V and VCC = 3.3 V simultaneously?

Yes - the device is explicitly designed for dual-supply operation: VCCQ must be 1.65–1.95 V (e.g., 1.8 V for I/O logic) and VCC must be 3.0–3.6 V (e.g., 3.3 V for core SRAM). This separation allows direct interfacing with 1.8 V microcontrollers while maintaining robust 3.3 V SRAM performance and VCAP charging efficiency.

How does Hardware STORE differ from Software STORE in terms of system-level timing control?

Hardware STORE is initiated asynchronously by pulling HSB low, completing within tDELAY (max 100 ns) + tSTORE (max 15 ms); it requires no SPI bus access. Software STORE uses the STORE opcode over SPI, adding command overhead and requiring active bus arbitration. Hardware STORE is preferred in hard real-time systems where SPI may be occupied during power faults.

Is the CY14V101Q3-SFXIT compatible with standard SPI EEPROM drivers?

No - while pin-compatible with SPI EEPROMs, its instruction set differs significantly: it requires dedicated opcodes (0x04 STORE, 0x05 RECALL, 0x06 ASENB, 0x07 ASDISB) and status register handling (RDY bit, BP0/BP1). Standard EEPROM drivers will not manage STORE/RECALL sequencing or VCAP supervision, risking data loss.