Infineon Technologies CY14B101KA-ZS25XI

Overview

CY14B101KA-ZS25XI from Cypress Semiconductor is a 1-Mbit (128K × 8) nonvolatile SRAM with integrated real-time clock, AutoStore capability, 25 ns access time, and industrial temperature support (–40°C to +85°C). It combines QuantumTrap-based nvSRAM with full RTC functionality-including alarm, watchdog timer, and capacitor-backed timekeeping-for mission-critical data logging in power-loss-prone systems such as industrial controllers and metering hardware.

For engineers reviewing the CY14B101KA-ZS25XI datasheet, CY14B101KA-ZS25XI pinout, CY14B101KA-ZS25XI application, or CY14B101KA-ZS25XI equivalent, key selection criteria include AutoStore timing under VCAP discharge, RTC interrupt configuration via INT pin, ×8 vs ×16 address/data mapping, and compatibility with 3.0 V ±10% supply rails and TSOP II packaging.

Technical Context

The device integrates two independent functional blocks: a high-speed SRAM array (128K × 8) and a parallel QuantumTrap nonvolatile storage matrix, enabling simultaneous read/write operations on SRAM while STORE/RECALL execute atomically across all cells. Its RTC subsystem features a 32.768 kHz crystal oscillator (Xin/Xout), programmable alarm intervals (minutes/hours/days/months), and a watchdog timer with reset output.

Power management is tightly coupled: VCAP supplies energy for AutoStore during VCC brownout; VRTCcap or VRTCbat provides backup for RTC operation only; HSB serves dual role-input trigger for hardware STORE and open-drain status indicator-and requires external pull-up for reliable power-up behavior.

Key Specifications

Pinout & Package

Package: 44-pin Thin Small Outline Package (TSOP II), Type II, RoHS-compliant, surface-mountable with 0.8 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STK15C88-3LF35 and FM31L278-G, CY14B101KA-ZS25XI uniquely delivers monolithic integration of fast nvSRAM, deterministic AutoStore, and full-featured RTC-enabling compact, low-risk designs for power-interrupted industrial systems without external timing or store-control logic.

Availability

CY14B101KA-ZS25XI is available at Aetrix Electronics and suitable for smart metering, industrial PLC data logging, and medical infusion pump control requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant TSOP packaging.

Supply support for CY14B101KA-ZS25XI 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) is a fabless semiconductor company specializing in high-reliability memory, PSoC programmable systems-on-chip, and USB/USB-C solutions for industrial and automotive markets.

CY14B101KA belongs to Cypress's nvSRAM product line, designed specifically for systems demanding zero-data-loss memory persistence and autonomous timekeeping during unpredictable power failures.

FAQ

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

The CY14B101KA-ZS25XI requires a minimum 4.7 µF tantalum capacitor on VCAP to guarantee successful STORE during VCC dropout down to 2.0 V. Ceramic capacitors are not recommended due to insufficient capacitance retention under bias; solid polymer or low-ESR tantalum types meet the 0.5 Ω ESR requirement specified in the datasheet.

Can the RTC operate independently while the nvSRAM is being accessed?

Yes-the RTC runs autonomously from the nvSRAM core. Clock counting, alarm generation, and watchdog timing continue uninterrupted during SRAM reads/writes, STORE, or RECALL. The only shared resource is the INT pin, which multiplexes RTC and power-monitor interrupts but supports concurrent servicing via flag register polling.

How does the ×8 vs ×16 configuration affect pin usage on CY14B101KA-ZS25XI?

CY14B101KA-ZS25XI is strictly ×8-configured: it uses A0–A16 and DQ0–DQ7, with no BHE/ BLE pins active. The ×16 variant (CY14B101MA) uses A0–A15 and DQ0–DQ15 and requires BHE/ BLE-so CY14B101KA-ZS25XI's pinout excludes BHE/ BLE and connects A16, making it incompatible with ×16 bus interfaces.

Is software RECALL supported, and how is it initiated?

Yes-software RECALL is fully supported and initiated by writing the sequence 0x5555 → 0x2AA → 0x0000 to address 0x0000. This forces immediate transfer of all nonvolatile data into SRAM, overriding automatic power-up RECALL. It is commonly used during firmware updates or diagnostic resets where prior state must be restored on demand.