Infineon Technologies CY14B101KA-ZS45XIT

Overview

CY14B101KA-ZS45XIT 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 functionality including alarm, watchdog timer, and 0.35 µA typical RTC backup current - deployed in industrial data loggers, POS terminals, and network infrastructure control modules.

For engineers reviewing the CY14B101KA-ZS45XIT datasheet, CY14B101KA-ZS45XIT pinout, CY14B101KA-ZS45XIT application, or CY14B101KA-ZS45XIT equivalent, key selection criteria include ×8 vs ×16 configuration compatibility, VCAP-based AutoStore timing margin, RTC interrupt routing via INT pin, and HSB-driven hardware STORE synchronization in fail-safe power-loss scenarios.

Technical Context

The CY14B101KA-ZS45XIT integrates a standard SRAM array with QuantumTrap nonvolatile elements in a monolithic die, enabling parallel STORE/RECALL across all 131,072 bytes. Its RTC block includes a 32.768 kHz crystal oscillator (Xin/Xout), programmable alarm with minute/hour/day/month granularity, and a watchdog timer with reset or interrupt output mode.

Power management is tightly coupled: VCAP supplies energy for AutoStore during VCC collapse below VSWITCH (~2.5 V), while RTC backup is independently configurable via VRTCcap (capacitor) or VRTCbat (battery). The device operates at 3.0 V ±10% over –40°C to +85°C and uses TSOP II-44 packaging with 44 pins, supporting both ×8 and ×16 data bus configurations through pin-strapping and address decoding.

Key Specifications

Pinout & Package

Package: 44-pin Thin Small Outline Package (TSOP II), Type II, RoHS-compliant, body size 10.16 mm × 18.41 mm × 1.2 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STK14C88-3AJ5F and FM24V10-G, CY14B101KA-ZS45XIT uniquely combines 45 ns SRAM speed, integrated alarm/watchdog RTC, and capacitor-only AutoStore - delivering lowest system-level BOM count and highest time-critical reliability in industrial fail-safe designs.

Availability

CY14B101KA-ZS45XIT is available at Aetrix Electronics and suitable for industrial data loggers, point-of-sale terminals, and network equipment control planes requiring stable component supply, long-life qualification, and RoHS-compliant sourcing.

Supply support for CY14B101KA-ZS45XIT 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 mixed-signal ICs for industrial, automotive, and IoT applications.

The CY14B nvSRAM product line was engineered to replace battery-backed SRAM and discrete RTC solutions in mission-critical systems where data persistence and time accuracy cannot tolerate single-point failures.

FAQ

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

The CY14B101KA-ZS45XIT requires a minimum 4.7 µF tantalum capacitor on VCAP to guarantee successful STORE during VCC dropout down to 2.5 V. Ceramic capacitors are not recommended due to insufficient charge capacity and DC bias derating; solid polymer or low-ESR tantalum types ensure tSTORE < 20 ms completion under worst-case temperature and voltage conditions.

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

Yes - the RTC runs autonomously from the SRAM array using its own oscillator and backup supply (VRTCcap or VRTCbat). Clock counting, alarm comparison, and watchdog timing continue uninterrupted during active SRAM reads/writes, provided VCC remains within specification and the RTC oscillator is enabled via register bit RTCEN.

How is the ×8 versus ×16 configuration selected on this device?

Configuration is fixed by part number: CY14B101KA is ×8 (128K × 8), CY14B101MA is ×16 (64K × 16). Pinout differs - ×16 variants use BHE/BLE and A0–A15 only; ×8 variants use A0–A16 and DQ0–DQ7 exclusively. No software or strap-pin selection exists; hardware design must match the chosen variant.

Is the INT pin configurable for active-HIGH or active-LOW assertion?

Yes - the INT pin output polarity is software-configurable via the RTC control register (RTCCR[7]). Setting RTCCR[7] = 1 selects active-HIGH push-pull mode; setting it to 0 configures active-LOW open-drain mode. External pull-up is required only in open-drain mode, and interrupt sources (alarm, watchdog, power monitor) are individually maskable in the interrupt enable register.