Infineon Technologies CY14B104K-ZS45XIT

Overview

CY14B104K-ZS45XIT from Cypress Semiconductor is a 4-Mbit nonvolatile SRAM (512 K × 8) with integrated real-time clock, 45 ns access time, single 3.0 V ±10% supply, and industrial temperature range (–40°C to +85°C). It combines infinite SRAM read/write cycles with 1 million STORE cycles to QuantumTrap nonvolatile elements and 20-year data retention, deployed in industrial control systems requiring persistent time-stamped memory during power loss.

For engineers reviewing the CY14B104K-ZS45XIT datasheet, CY14B104K-ZS45XIT pinout, CY14B104K-ZS45XIT application, or CY14B104K-ZS45XIT equivalent, key selection criteria include AutoStore activation via VCAP capacitor, RTC alarm interrupt programmability, HSB-controlled hardware STORE timing, and ×8 parallel interface compatibility with legacy microcontrollers.

Technical Context

The device integrates a standard SRAM array and QuantumTrap nonvolatile storage in a monolithic die, enabling parallel STORE/RECALL across all 524,288 bytes. STORE is triggered by power-down (AutoStore), software command, or HSB pin assertion; RECALL occurs automatically on power-up or via software.

RTC functionality includes leap-year-corrected timekeeping, programmable minute/hour/day/month alarms, watchdog timer, and dual backup options-VCAP capacitor (0.1 µF) or external battery on VRTCbat-with independent oscillator calibration and INT pin configurable for active-HIGH push-pull or active-LOW open-drain interrupt output.

Key Specifications

Pinout & Package

44-pin Thin Small Outline Package (TSOP II), 10.16 mm × 18.42 mm × 1.2 mm body, RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STK14CA8-NV55I and FM24V10-G, CY14B104K-ZS45XIT uniquely delivers capacitor-backed AutoStore, full leap-year RTC, and integrated watchdog - making it optimal for sealed, maintenance-free industrial systems requiring both memory persistence and precise time-aware logging.

Availability

CY14B104K-ZS45XIT is available at Aetrix Electronics and suitable for industrial PLC data logging, smart energy metering, and railway signaling systems requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.

Supply support for CY14B104K-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 U.S.-based semiconductor company specializing in high-reliability memory, PSoC programmable systems-on-chip, and timing solutions for industrial and automotive markets.

This device belongs to Cypress's nvSRAM product line, engineered specifically for applications demanding zero-data-loss memory persistence combined with autonomous timekeeping - eliminating external RTC and backup power management circuitry.

FAQ

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

The CY14B104K-ZS45XIT requires a 0.1 µF ceramic capacitor on the VCAP pin, rated for ≥10 V, placed within 5 mm of the package per PCB layout guidelines. This value ensures sufficient charge to complete one full STORE cycle during VCC collapse from 3.0 V to VSWITCH (typically 2.0 V), as verified in DC Electrical Characteristics Table on page 16 of Rev. AD datasheet.

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 power domain. Reads/writes to SRAM do not stall or reset the RTC counter, and RTC interrupts (alarm, watchdog) remain active and deliverable via the INT pin regardless of ongoing memory transactions.

Is the CY14B104K-ZS45XIT pin-compatible with the CY14B104M variant?

No - CY14B104K (×8) and CY14B104M (×16) use different pinouts: the K-version has 44-pin TSOP II with DQ0–DQ7 only, while the M-version uses 54-pin TSOP II with DQ0–DQ15 and added BHE/BLE pins. Address mapping also differs (A0–A18 vs. A0–A17), requiring PCB redesign for substitution.

How is data integrity ensured during STORE/RECALL cycles?

Data integrity is enforced by hardware-level atomicity: STORE transfers all 524,288 bytes in parallel from SRAM to QuantumTrap cells with built-in error detection, and RECALL reloads the entire array simultaneously. During either operation, SRAM read/write is inhibited, and HSB asserts LOW to signal bus inactivity - preventing partial writes or corrupted reads.