Infineon Technologies CY14B101PA-SFXIT

Overview

CY14B101PA-SFXIT from Cypress Semiconductor is a 1-Mbit (128K × 8) serial SPI nonvolatile SRAM with integrated real-time clock, AutoStore/RECALL functionality, and 40 MHz/104 MHz dual-speed SPI interface. It operates from 2.7 V to 3.6 V, supports hardware STORE via HSB pin, and delivers 20-year data retention at 85 °C in industrial temperature range. Used in metering, industrial logging, and backup-critical control systems where power-loss resilience and time-stamped data integrity are essential.

For engineers reviewing the CY14B101PA-SFXIT datasheet, CY14B101PA-SFXIT pinout, CY14B101PA-SFXIT application, or CY14B101PA-SFXIT equivalent, key selection criteria include SPI mode 0/3 compatibility, RTC alarm/interrupt capability, VCAP-backed AutoStore timing, and hardware write protection via WP/HSB pins - all confirmed in Cypress Document 001-54392 Rev. *P.

Technical Context

This nvSRAM integrates QuantumTrap nonvolatile storage with standard SRAM array, enabling infinite SRAM read/write cycles while supporting up to 1 million STORE cycles to nonvolatile elements. The embedded RTC includes programmable square wave output (1 Hz to 32.768 kHz), watchdog timer, alarm interrupt, and backup power fail detection.

SPI operation supports both 40 MHz zero-cycle-delay access and 104 MHz fast-read mode using dedicated instructions. Power management includes active (3 mA @ 40 MHz), standby (250 µA), and sleep (8 µA) modes, with AutoStore triggered by VCAP discharge during VCC drop below threshold.

Key Specifications

Pinout & Package

16-pin SOIC (Small Outline Integrated Circuit) package, RoHS-compliant, 300-mil body width, gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STK14CA8-NF55I and FM24V10-G, CY14B101PA-SFXIT uniquely combines SPI interface, integrated RTC with alarm/watchdog/square wave, and capacitor-backed AutoStore - eliminating external components while meeting industrial data integrity and timing requirements.

Availability

CY14B101PA-SFXIT is available at Aetrix Electronics and suitable for smart metering, industrial data logging, PLC I/O modules, and medical diagnostic equipment requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.

Supply support for CY14B101PA-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 mixed-signal ICs for industrial, automotive, and IoT applications, with expertise in nonvolatile memory and timing solutions.

The CY14X101PA product line integrates QuantumTrap nvSRAM and full-featured RTC in monolithic SPI devices for applications demanding deterministic power-loss data preservation and precise timekeeping without external components.

FAQ

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

The datasheet specifies a minimum 47 µF tantalum or low-ESR electrolytic capacitor on VCAP for guaranteed STORE completion during VCC dropout. At 3.3 V supply and 2.7 V VCAP threshold, this provides ≥120 ms hold-up time per Cypress characterization - sufficient for most AC/DC power supplies with bulk capacitance decay profiles.

Can the RTC operate independently while the nvSRAM is in sleep mode?

Yes. The RTC continues running in sleep mode (8 µA) using VRTCcap or VRTCbat power. Only the SPI interface and SRAM array are gated; RTC registers, alarm logic, and square wave generator remain fully functional and accessible via RDRTC/WRTC instructions.

How does hardware STORE differ from Software STORE in terms of timing and reliability?

Hardware STORE initiates immediately on HSB pin fall, completing in ≤20 ms (typical) with no host SPI overhead. Software STORE requires SPI command issuance and takes same duration but adds instruction latency. Both use identical QuantumTrap programming - hardware STORE is preferred for deterministic power-loss response.

Is the 104 MHz SPI mode supported on all instruction types?

No. The 104 MHz clock rate applies only to FAST_READ and FAST_RDRTC instructions. Standard READ, WRITE, STORE, RECALL, and register-access instructions are limited to 40 MHz. This distinction is enforced by internal instruction decoding - attempting 104 MHz on unsupported opcodes results in undefined behavior.