Infineon Technologies CY14B101PA-SFXI

Overview

CY14B101PA-SFXI 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 environments - used in metering systems requiring power-loss-resilient time-stamped logging.

For engineers reviewing the CY14B101PA-SFXI datasheet, CY14B101PA-SFXI pinout, CY14B101PA-SFXI application, or CY14B101PA-SFXI equivalent, key selection criteria include RTC backup current (0.45 µA typ), SPI mode 0/3 compatibility, QuantumTrap endurance (1M STORE cycles), and VCAP-based AutoStore timing during brownout.

Technical Context

The device integrates SRAM and QuantumTrap nonvolatile storage on a single die, enabling zero-cycle-delay SPI reads/writes to volatile memory while using capacitor-backed VCAP to trigger automatic STORE on power loss. Its RTC subsystem includes programmable alarm, watchdog timer, and selectable square-wave outputs (1 Hz to 32.768 kHz).

SPI communication uses standard opcodes plus four nvSRAM-specific instructions (STORE, RECALL, ASENB, ASDISB), with status register control for block protection (1/4, 1/2, full array) and write enable/disable. The HSB pin provides hardware-level busy indication and STORE initiation, decoupled from software sequencing.

Key Specifications

Pinout & Package

16-pin Small Outline Integrated Circuit (SOIC) package with 300-mil body width and standard gull-wing lead form.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STK11C88-3F and FM24V10-G, CY14B101PA-SFXI uniquely combines SPI nvSRAM and full RTC in one SOIC package with capacitor-backed AutoStore - reducing component count, eliminating timing uncertainty in power-loss scenarios, and simplifying layout for compact industrial modules.

Availability

CY14B101PA-SFXI is available at Aetrix Electronics and suitable for smart metering, industrial PLC data logging, medical infusion pump event history, and automotive telematics black box applications requiring stable component supply and long-term lifecycle assurance.

Supply support for CY14B101PA-SFXI 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 RTC into monolithic SPI devices to replace discrete memory + RTC combinations in space-constrained, power-interruption-prone systems.

FAQ

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

A 4.7 µF tantalum capacitor is specified for guaranteed AutoStore functionality across the full 2.7–3.6 V operating range and industrial temperature span. Lower values may work under specific conditions but are not characterized or warranted per datasheet Rev. *P. Ceramic capacitors are not recommended due to DC bias and aging effects that reduce effective capacitance below threshold.

Can the RTC operate independently when VCC is absent?

Yes - when VRTCcap or VRTCbat is connected and VCC is removed, the RTC continues running from backup power with typical current draw of 0.45 µA. The SRAM contents are retained only if VCAP supplies sufficient energy for STORE before VCC drops below 2.0 V; RTC timekeeping persists regardless.

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

Hardware STORE initiates immediately upon HSB pin falling edge and completes autonomously, making it immune to MCU lockup or software delay. Software STORE requires SPI command issuance and executes after instruction decode, introducing ~2 µs latency. Both use identical QuantumTrap programming sequence and duration (~10 ms).

Is the CY14B101PA-SFXI RoHS compliant and qualified for industrial temperature range?

Yes - the CY14B101PA-SFXI is RoHS compliant (per datasheet Rev. *P) and rated for industrial temperature operation from –40 °C to +85 °C. The 16-pin SOIC package meets JEDEC MS-012 standards, and thermal resistance (θ_JA) is 110 °C/W, validated under natural convection conditions.