Infineon Technologies CY14B101KA-SP45XI

Overview

CY14B101KA-SP45XI from Cypress Semiconductor is a 1-Mbit (128K × 8) nonvolatile SRAM with integrated real-time clock, AutoStore capability, and 45 ns access time. It operates at 3.0 V ±10% over industrial temperature range (–40°C to +85°C), uses QuantumTrap nonvolatile storage technology, and supports infinite SRAM read/write cycles with 1 million STORE endurance. It is used in industrial control systems requiring persistent time-stamped data logging during power loss.

For engineers reviewing the CY14B101KA-SP45XI datasheet, CY14B101KA-SP45XI pinout, CY14B101KA-SP45XI application, or CY14B101KA-SP45XI equivalent, key selection criteria include AutoStore capacitor support (VCAP), RTC backup current (0.35 µA typ), ×8 bus configuration, 44-pin TSOP II package, and hardware STORE/RECALL timing compatibility with legacy 8-bit microcontrollers.

Technical Context

The device integrates SRAM and QuantumTrap nonvolatile elements in a monolithic IC, enabling parallel STORE/RECALL across all 131,072 bytes. Its RTC includes leap-year tracking, programmable alarm (minutes/hours/days/months), watchdog timer, and dual backup options (capacitor on VRTCcap or battery on VRTCbat).

AutoStore initiates automatically when VCC drops below VSWITCH, using charge stored on the external VCAP capacitor. Hardware STORE is triggered by pulling HSB LOW, while software STORE uses an address-based write sequence. The ×8 configuration uses A0–A16 and DQ0–DQ7, with OE/CE/WE control logic matching standard SRAM timing.

Key Specifications

Pinout & Package

Package: 44-pin Thin Small Outline Package (TSOP II), Type II, 400 mil width, lead-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STK14CA8-NL35I and FM1808-40-SG, CY14B101KA-SP45XI uniquely balances low RTC backup current, hands-off AutoStore reliability, and ×8 bus compatibility-making it optimal for cost-sensitive industrial loggers where capacitor-based backup is preferred over crystal routing or FRAM's higher leakage.

Availability

CY14B101KA-SP45XI is available at Aetrix Electronics and suitable for industrial data loggers, smart energy meters, and PLC I/O modules requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.

Supply support for CY14B101KA-SP45XI 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 nonvolatile memory and timing solutions.

CY14B101KA belongs to Cypress's nvSRAM product line, engineered specifically for systems needing deterministic data persistence and accurate timekeeping without external supervision or complex power management firmware.

FAQ

What is the required VCAP capacitor value and type for reliable AutoStore operation?

The datasheet specifies a 4.7 µF tantalum capacitor rated for ≥6.3 V on the VCAP pin. Ceramic capacitors are not recommended due to insufficient capacitance retention under bias and DC leakage characteristics. Mounting must minimize trace inductance, and the capacitor should be placed within 5 mm of the VCAP pin with direct ground plane connection to ensure full STORE completion during rapid VCC collapse.

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, alarm, or watchdog functions. The INT pin can assert asynchronously during memory operations, and RTC registers are accessible via dedicated address-mapped locations without interfering with SRAM timing.

Is CY14B101KA-SP45XI pin-compatible with CY14B101MA-SP45XI?

No-CY14B101KA is ×8 (128K × 8, uses A0–A16 and DQ0–DQ7), while CY14B101MA is ×16 (64K × 16, uses A0–A15, DQ0–DQ15, and BHE/BLE). Their pinouts differ: the MA variant includes BHE/BLE pins and omits A16, making them electrically and physically incompatible without PCB redesign.

How is the 20-year data retention validated?

Data retention is specified at +85°C based on accelerated life testing per JEDEC JESD22-A117. Devices undergo 1000-hour bake at +125°C, then measured for bit failures; extrapolation using Arrhenius modeling confirms ≥20 years at +85°C with <1 ppm failure rate. This applies to data stored in QuantumTrap cells after successful STORE, not SRAM volatile contents.