Infineon Technologies CY14B101KA-ZS45XI

Overview

CY14B101KA-ZS45XI from Cypress Semiconductor is a 1-Mbit (128K × 8) nonvolatile SRAM with integrated real-time clock, designed for systems requiring persistent memory and timekeeping without external backup batteries. It delivers 45 ns access time, supports AutoStore on power-down using only a VCAP capacitor, and provides full RTC features including alarm, watchdog timer, and 0.35 µA typical RTC backup current - deployed in industrial data loggers and metering systems.

For engineers reviewing the CY14B101KA-ZS45XI datasheet, CY14B101KA-ZS45XI pinout, CY14B101KA-ZS45XI application, or CY14B101KA-ZS45XI equivalent, key selection criteria include ×8 vs ×16 configuration mapping, VCAP-based AutoStore timing, RTC interrupt routing via INT pin, and compatibility with 3.0 V ±10% supply rails under industrial temperature range.

Technical Context

This monolithic nvSRAM integrates QuantumTrap nonvolatile storage with a parallel-architecture SRAM array and a fully featured RTC subsystem. The device executes STORE/RECALL operations in parallel across all 131,072 bytes, with infinite SRAM read/write cycles and 1 million STORE endurance to nonvolatile elements.

The RTC includes leap-year tracking, programmable oscillator calibration, minute/hour/day/month alarm interrupts, and a watchdog timer - all backed by either VRTCcap (capacitor) or VRTCbat (battery), with independent 0.35 µA typical backup current draw.

Key Specifications

Pinout & Package

Package: 44-pin Thin Small Outline Package (TSOP II), 12 × 20 mm body, 0.8 mm pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STK15C88-45I and FM31L276-G, CY14B101KA-ZS45XI uniquely combines hands-off AutoStore, integrated RTC with alarm/watchdog, and 20-year data retention - reducing system-level complexity and qualification effort for safety-critical power-loss recovery.

Availability

CY14B101KA-ZS45XI is available at Aetrix Electronics and suitable for industrial data loggers, smart electricity meters, PLC I/O modules, and medical infusion pump controllers requiring stable component supply and long lifecycle support.

Supply support for CY14B101KA-ZS45XI 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 emphasis on integration, security, and longevity.

The CY14B nvSRAM product line was engineered to replace battery-backed SRAM in mission-critical systems - delivering zero-maintenance, RoHS-compliant nonvolatility with embedded timekeeping for deterministic power-loss recovery.

FAQ

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

The datasheet specifies a minimum 4.7 µF tantalum capacitor on VCAP for guaranteed AutoStore functionality at 2.7 V VCC and –40°C. Lower values may work at room temperature but risk incomplete STORE under worst-case voltage and temperature conditions. Use low-ESR capacitors rated for ≥105°C and verify tSTORE timing in-system using HSB monitoring.

Can the RTC operate independently while the nvSRAM is in deep sleep or powered down?

Yes - the RTC continues running from VRTCcap or VRTCbat even when VCC is removed, drawing only 0.35 µA typical. The nvSRAM core powers down, but RTC registers, alarm settings, and oscillator remain fully functional and retain time/date. No host interaction is needed to maintain RTC accuracy during main power absence.

How does the CY14B101KA-ZS45XI prevent unintended STORE operations during normal operation?

The device ignores AutoStore and Hardware STORE unless at least one write has occurred since the last STORE or RECALL cycle. This prevents spurious writes due to noise or glitches on HSB or power transients. Software STORE always executes regardless of prior writes, giving firmware full control for intentional saves.

Is the CY14B101KA-ZS45XI pin-compatible with earlier CY14B101K versions?

Yes - CY14B101KA-ZS45XI maintains identical pinout, electrical characteristics, and timing behavior with CY14B101K-BA45XIT and CY14B101K-BA45XIT, including TSOP II 44-pin layout and VCAP/RTC pin assignments. Migration requires no PCB change, only updated part marking and qualification documentation.