Infineon Technologies CY14E101J2-SXI

Overview

CY14E101J2-SXI from Infineon Technologies (formerly Cypress) is a 1-Mbit (128 K × 8) serial I²C nonvolatile SRAM with integrated real-time clock, operating at 4.5–5.5 V, featuring AutoStore on power-down, Power-Up RECALL, and programmable square-wave output (1 Hz / 512 Hz / 4.096 kHz / 32.768 kHz). It delivers infinite SRAM read/write cycles, 1 million STORE cycles, and 20-year data retention at 85 °C - deployed in industrial metering, PLCs, and backup-critical control systems.

For engineers reviewing the CY14E101J2-SXI datasheet, CY14E101J2-SXI pinout, CY14E101J2-SXI application, or CY14E101J2-SXI equivalent, key selection criteria include I²C speed support up to 3.4 MHz, RTC alarm/interrupt capability, hardware STORE/RECALL via HSB pin, and dual backup options (capacitor or battery for RTC).

Technical Context

This device integrates QuantumTrap™ nonvolatile storage with standard SRAM in a single monolithic IC, enabling seamless STORE (SRAM → nonvolatile) and RECALL (nonvolatile → SRAM) operations without external controllers. The RTC subsystem includes independent counters, alarm registers, watchdog timer, and programmable INT/SQW output with selectable active-HIGH or open-drain drive.

I²C interface supports all four standard modes: Standard (100 kHz), Fast (400 kHz), Fast Plus (1 MHz), and High Speed (3.4 MHz), with zero-cycle-delay reads/writes and full slave address decoding via A1/A2 pins. Write protection is implemented both via hardware (WP pin) and software (block lock registers).

Key Specifications

Pinout & Package

16-pin Small Outline Integrated Circuit (SOIC) package with 300-mil body width and standard gull-wing lead form - compatible with automated SMT placement and reflow profiles per IPC-7351B.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STK14C88-3A50I and FM31L278-G, CY14E101J2-SXI uniquely combines I²C-native 1-Mbit nvSRAM, hardware STORE/RECALL, full RTC feature set, and multiple SQW frequencies - making it optimal for new 5 V designs requiring time-stamped, power-loss-resilient storage without interface translation.

Availability

CY14E101J2-SXI is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, medical infusion pumps, and telecom base station monitoring requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for CY14E101J2-SXI 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

Infineon Technologies is a global semiconductor leader headquartered in Munich, Germany, specializing in power management, sensing, connectivity, and security solutions for automotive, industrial, and IoT markets.

CY14E101J2-SXI belongs to Infineon's legacy Cypress nvSRAM product line - engineered specifically for applications demanding deterministic nonvolatile storage with integrated timekeeping, eliminating external RTC and backup controller dependencies.

FAQ

What is the maximum I²C clock frequency supported by CY14E101J2-SXI?

The device supports I²C High Speed mode up to 3.4 MHz, in addition to Standard (100 kHz), Fast (400 kHz), and Fast Plus (1 MHz) modes. All modes use the same physical interface and slave addressing - no configuration register changes are needed to switch speeds. Timing compliance must be verified per AC switching characteristics table in datasheet Rev. *M, especially tSU;STA and tHD;STA at 3.4 MHz.

Can CY14E101J2-SXI operate without an external crystal?

Yes - the RTC can function using internal RC oscillation when Xin/Xout are left unconnected, though accuracy degrades to ±5% over temperature. For time-critical applications like metering or telecom sync, a 32.768 kHz crystal must be connected to Xin/Xout; no external load capacitors are required due to internal 12.5 pF tuning.

How does AutoStore work during power failure?

When VCC drops below VCC(min) (~4.25 V), the internal power-fail detector triggers AutoStore: SRAM contents are transferred to QuantumTrap cells using energy stored in the external VCAP capacitor (≥47 µF). The process completes in ≤20 ms and requires no host intervention - confirmed by HSB pin transition from LOW to HIGH upon completion.

Is the serial number field writable and lockable?

Yes - the 8-byte serial number is user-writable once via I²C command, then permanently lockable using the Serial Number Lock register. After locking, reads return the programmed value but writes are disabled indefinitely. This enables secure device identification and anti-counterfeiting in production programming workflows.