Infineon Technologies CY14B101J1-SXI

Overview

CY14B101J1-SXI 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-loss using VCAP capacitor, Power-Up RECALL, and full RTC functionality including alarm, watchdog timer, and programmable square-wave output (1 Hz to 32.768 kHz). It operates from 2.7 V to 3.6 V and supports I²C speeds up to 3.4 MHz in high-speed mode.

For engineers reviewing the CY14B101J1-SXI datasheet, CY14B101J1-SXI pinout, CY14B101J1-SXI application, or CY14B101J1-SXI equivalent, key selection considerations include its dual-function architecture (nvSRAM + RTC), hardware STORE/RECALL control via HSB pin, I²C slave address configuration (A1/A2), backup power options (VCAP/VRTCcap/VRTCbat), and write protection via WP pin and software block locking.

Technical Context

This device integrates QuantumTrap nonvolatile storage with fast SRAM, enabling infinite SRAM read/write cycles and 1 million STORE cycles to nonvolatile elements with 20-year data retention at 85 °C. The RTC subsystem includes independent counters, alarm registers, watchdog timer, and interrupt generation via INT/SQW pin.

The 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 open-drain SDA/SCL requiring external pull-ups. Slave addressing uses 7-bit format with A1/A2 pins defining LSBs of address.

Key Specifications

Pinout & Package

16-pin SOIC package with 1.27 mm pitch; body width 7.5 mm; lead finish matte tin.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STK14CA8-3LF3A and DS3231M+, CY14B101J1-SXI uniquely combines high-density nonvolatile memory and full RTC in one I²C device, reducing component count, PCB area, and firmware complexity - especially valuable in battery-powered or space-constrained embedded systems requiring both persistent data and precise time stamps.

Availability

CY14B101J1-SXI is available at Aetrix Electronics and suitable for industrial data loggers, smart metering systems, medical diagnostic devices, and PLC controller modules requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for CY14B101J1-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, automotive, industrial, and security solutions with strong emphasis on reliability and longevity.

CY14B101J1-SXI belongs to Infineon's legacy Cypress nvSRAM product line, designed specifically for mission-critical embedded systems requiring simultaneous high-speed volatile memory access and autonomous, low-power timekeeping with nonvolatile data retention.

FAQ

What is the function of the HSB pin?

The HSB (Hardware STORE Busy) pin serves dual roles: as an output, it signals active STORE/RECALL operations by driving LOW; as an input, pulling it LOW externally triggers a Hardware STORE. After completion, it returns HIGH via weak internal pull-up. This enables deterministic host-initiated nonvolatile save without polling or I²C command overhead.

Can VCAP and VRTCcap be used simultaneously?

No. VCAP supplies energy for AutoStore during main power loss, while VRTCcap provides backup power solely for the RTC. They serve independent functions and must not share components. Using both simultaneously risks voltage contention and violates datasheet operating conditions. Choose VCAP for data persistence or VRTCcap for RTC-only backup - never both.

How does the I²C slave address work with A1 and A2 pins?

The CY14B101J1-SXI uses a fixed 7-bit base address of 0x50 (1010000b), with A1 and A2 pins setting the two LSBs. Default (both pins unconnected/internal pull-down) yields 0x50. Connecting A1 or A2 to VCC increments the address by 1 or 2 respectively, allowing up to four devices on one I²C bus without address conflict.

Is the RTC accurate enough for utility metering applications?

Yes - the integrated RTC achieves ±3.5 ppm accuracy over –40 °C to +85 °C when paired with a standard 32.768 kHz crystal and proper PCB layout. Its programmable calibration register allows fine-tuning to meet ANSI C12.1 and IEC 62053-21 requirements for revenue-grade metering, provided crystal load capacitance and trace routing follow datasheet layout guidelines.