Infineon Technologies CY14B512I-SFXI

Overview

CY14B512I from Cypress Semiconductor is a 512-Kbit (64 K × 8) serial I²C nonvolatile SRAM with integrated real-time clock, designed for data logging and time-stamped event storage in industrial controllers and metering systems. It features AutoStore on power-down, Power-Up RECALL, 1 MHz Fast Mode Plus I²C interface, 0.45 µA RTC backup current, and hardware STORE/RECALL via HSB pin.

For engineers reviewing the CY14B512I datasheet, CY14B512I pinout, CY14B512I application, or CY14B512I equivalent, key selection criteria include I²C speed support up to 3.4 MHz, RTC alarm and watchdog timer functionality, VCC operating range of 2.7–3.6 V, and QuantumTrap-based 20-year data retention at 85 °C.

Technical Context

The device integrates SRAM and QuantumTrap nonvolatile elements in a single die, enabling automatic STORE on power loss using VCAP-supplied energy and deterministic RECALL at power-up. Its dual-function INT/SQW pin supports both interrupt signaling (clock alarm, watchdog timeout, power fail) and programmable square wave output (1 Hz / 512 Hz / 4.096 kHz / 32.768 kHz).

I²C communication supports four speed modes-Standard (100 kHz), Fast (400 kHz), Fast Mode Plus (1 MHz), and High Speed (3.4 MHz)-with zero-cycle-delay reads/writes and slave address selection via A2–A0 pins. RTC registers are accessed through dedicated I²C slave addresses separate from memory space.

Key Specifications

Pinout & Package

Package: 16-pin SOIC (Small Outline Integrated Circuit), RoHS-compliant, industrial temperature grade (–40 °C to +85 °C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STK14C88-3A55I and FM31L278-G, CY14B512I uniquely combines 512 Kbit density, hardware AutoStore with VCAP, full-featured RTC with alarm/watchdog/square wave, and 20-year retention - making it optimal for new designs requiring robust, time-aware nonvolatile storage in 3.3 V systems.

Availability

CY14B512I is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, medical device data logging, and network equipment configuration backup requiring stable component supply and long-term lifecycle support.

Supply support for CY14B512I 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) is a fabless semiconductor company specializing in mixed-signal ICs for embedded systems, connectivity, and memory solutions.

CY14B512I belongs to Cypress's nvSRAM+RTC product line, engineered specifically for applications demanding deterministic, power-fail-safe data capture with precise time correlation - targeting utility, industrial, and medical markets.

FAQ

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

The datasheet specifies a minimum 0.22 F tantalum or supercapacitor on VCAP for guaranteed STORE completion during a 10 ms VCC dropout at 3.3 V. Lower values may work under specific conditions but are not characterized or recommended for production use. Capacitor ESR must be ≤1 Ω to ensure sufficient discharge current.

Can the RTC operate without external crystal or backup power?

No. The RTC requires either an external 32.768 kHz crystal (Xin/Xout) or a backup power source (VCAP for short-term or VRTCbat for long-term) to maintain timekeeping during VCC absence. With neither, the RTC halts and resets on next power-up; however, nvSRAM contents remain intact.

How does the HSB pin function during a Hardware STORE sequence?

When HSB is pulled LOW externally, the device initiates immediate STORE from SRAM to QuantumTrap cells. During execution, HSB is driven LOW to signal busy status. Upon completion, it is driven HIGH for tHHHD (≤100 µs), then held HIGH by a weak internal pull-up. No external pull-up is required unless driving other loads.

Is software block protection compatible with RTC register access?

Yes. Memory block protection (quarter/half/whole array) applies only to nvSRAM address space. RTC registers, control registers, serial number, and manufacturer ID reside in separate I²C slave address spaces and remain fully accessible regardless of memory protection state.