Infineon Technologies CY14B064I-SFXI

Overview

CY14B064I from Cypress Semiconductor is a 64-Kbit (8K × 8) serial I²C nonvolatile SRAM with integrated real-time clock (RTC), designed for data logging and time-stamped event storage in power-loss-prone systems. It features AutoStore using VCAP capacitor backup, 1 MHz Fast Mode Plus I²C interface, and RTC functions including alarm, watchdog timer, and programmable square-wave output (1 Hz / 512 Hz / 4.096 kHz / 32.768 kHz).

For engineers reviewing the CY14B064I datasheet, CY14B064I pinout, CY14B064I application, or CY14B064I equivalent, key selection considerations include its 2.7–3.6 V operating range, hardware STORE/RECALL via HSB pin, RTC backup current (0.45 µA typ), and I²C slave address configuration via A2–A0 pins.

Technical Context

This monolithic nvSRAM integrates QuantumTrap nonvolatile storage with an 8K × 8 SRAM array and a full-featured RTC subsystem. STORE operations occur automatically on power-down (using VCAP) or via Software/Hardware triggers; RECALL restores data to SRAM on power-up or via command.

The RTC includes independent counters, programmable alarm and watchdog interrupts, backup power fail detection, and dual backup options (capacitor on VRTCcap or battery on VRTCbat). The I²C interface supports all 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.

Key Specifications

Pinout & Package

Package: 16-pin Small Outline Integrated Circuit (SOIC), 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 STK14CA8-R and DS1347, CY14B064I uniquely combines reliable 64-Kbit nvSRAM with full RTC in one SOIC package - reducing component count, simplifying layout, and guaranteeing synchronized time-and-data capture without host coordination.

Availability

CY14B064I is available at Aetrix Electronics and suitable for smart metering, industrial data logging, medical device event recording, and automotive telematics requiring stable component supply and long-term lifecycle support.

Supply support for CY14B064I 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 CY14B series targets mission-critical systems needing guaranteed data persistence and accurate timekeeping under variable power conditions - especially where firmware simplicity and component consolidation are design priorities.

FAQ

What is the minimum VCAP capacitance required for reliable AutoStore?

A minimum 47 µF tantalum or ceramic capacitor is required on VCAP to ensure sufficient energy for complete STORE during a 10 ms VCC dropout at 3.6 V. Larger values (e.g., 100 µF) extend margin for longer dropouts or lower voltages. The capacitor must be rated ≥6.3 V and placed within 5 mm of the VCAP pin with low-impedance routing.

Can VRTCcap and VRTCbat be used simultaneously?

No - VRTCcap and VRTCbat are mutually exclusive backup sources. Only one may be connected: either a capacitor to VRTCcap (with VRTCbat left open), or a battery to VRTCbat (with VRTCcap left open). Using both risks reverse current flow and RTC malfunction. The internal RTC power switch automatically selects the active source.

How does the HSB pin function during Hardware STORE?

Pulling HSB low initiates immediate STORE from SRAM to QuantumTrap cells. During execution, HSB is driven LOW to indicate busy status. Upon completion, it transitions HIGH for tHHHD (≤100 µs), then remains HIGH via weak internal pull-up. Host must wait for HIGH-to-LOW-to-HIGH transition before issuing next command.

Is the 8-byte serial number writable or locked permanently?

Each CY14B064I receives a factory-programmed, globally unique 8-byte serial number. It is read-only and permanently locked - no software or hardware command can modify or erase it. This enables secure device identification, anti-counterfeiting, and firmware binding in regulated applications such as medical or utility equipment.