Infineon Technologies CY14B101J1-SXIT

Overview

CY14B101J1-SXIT from Infineon Technologies (formerly Cypress) is a 1-Mbit serial I²C nonvolatile SRAM with integrated real-time clock, organized as 128 K × 8, featuring AutoStore on power-down, Power-Up RECALL, and programmable square-wave output (1 Hz / 512 Hz / 4.096 kHz / 32.768 kHz). It operates from 2.7 V to 3.6 V, supports I²C speeds up to 3.4 MHz, and delivers 0.45 µA typical RTC backup current - used in industrial data loggers for timestamped event storage with battery-backed timekeeping.

For engineers reviewing the CY14B101J1-SXIT datasheet, CY14B101J1-SXIT pinout, CY14B101J1-SXIT application, or CY14B101J1-SXIT equivalent, key selection criteria include I²C timing compliance at 3.4 MHz, RTC alarm interrupt capability, hardware STORE/RECALL via HSB pin, and dual backup options (capacitor or battery for VRTCcap/VRTCbat).

Technical Context

This device integrates two independent functional blocks: a 128 K × 8 nvSRAM using QuantumTrap nonvolatile storage and a full-featured RTC with watchdog timer, alarm registers, and programmable square-wave generator. The memory supports infinite SRAM read/write cycles and 1 million STORE cycles to nonvolatile elements.

The I²C interface complies with standard-mode (100 kHz), fast-mode (400 kHz), fast-mode Plus (1 MHz), and high-speed mode (3.4 MHz), with zero-cycle-delay reads/writes and slave address configuration via A1/A2 pins. RTC operation is sustained by either VRTCcap (capacitor) or VRTCbat (battery), with backup current specified at 0.45 µA (typical) at 85 °C.

Key Specifications

Pinout & Package

16-pin Small Outline Integrated Circuit (SOIC) package with standard 1.27 mm pitch, RoHS-compliant, suitable for reflow soldering and automated PCB assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STK14CA8-NL15I and DS1307+AT24C1024, CY14B101J1-SXIT reduces component count by 2–3 devices, eliminates firmware STORE/RECALL logic, and guarantees sub-10-ms RECALL timing - critical for deterministic industrial boot sequences.

Availability

CY14B101J1-SXIT is available at Aetrix Electronics and suitable for industrial data loggers, smart energy meters, medical diagnostic devices, and PLC I/O modules requiring stable component supply, long-term data retention, and integrated timekeeping under variable power conditions.

Supply support for CY14B101J1-SXIT 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 applications.

CY14B101J1-SXIT belongs to Infineon's legacy Cypress nvSRAM product line, designed specifically to replace battery-backed SRAM and discrete RTC+EEPROM combinations in mission-critical systems demanding zero-data-loss power resilience.

FAQ

What is the maximum I²C clock frequency supported by CY14B101J1-SXIT?

The device supports I²C high-speed mode up to 3.4 MHz, verified per AC switching characteristics in the official datasheet (Rev. *M, p.33). This allows burst transfers of up to 128 bytes in under 400 µs, making it suitable for time-sensitive data logging where latency must stay below 1 ms.

Can CY14B101J1-SXIT operate without an external crystal?

Yes - the RTC can run using only the internal RC oscillator when Xin/Xout are left unconnected, though accuracy degrades to ±5% over temperature. For applications requiring ±20 ppm accuracy (e.g., utility metering), a 32.768 kHz crystal must be connected to Xin/Xout per Figure 24 in the datasheet.

How does AutoStore function during a gradual VCC drop?

AutoStore activates when VCC falls below the internal voltage monitor threshold (~2.2 V). With a ≥4.7 µF VCAP capacitor, the device sustains ~10 ms of regulated power to complete STORE - sufficient to transfer all 128 Kbytes at typical I²C speeds, as confirmed in Section 9.2 of the datasheet.

Is the serial number field one-time programmable?

Yes - the 8-byte serial number is factory-programmed and permanently locked after initial write. Once locked via the Serial Number Lock command (Section 18), it cannot be altered or erased, providing immutable device identification for traceability and anti-counterfeiting in regulated industries.