Infineon Technologies CY14B101KA-SP45XIT

Overview

CY14B101KA-SP45XIT 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 a single capacitor, and provides full RTC features including alarm, watchdog timer, and 0.35 µA typical RTC backup current. Used in industrial data loggers where timestamped sensor records must survive power loss.

For engineers reviewing the CY14B101KA-SP45XIT datasheet, CY14B101KA-SP45XIT pinout, CY14B101KA-SP45XIT application, or CY14B101KA-SP45XIT equivalent, key selection criteria include ×8 vs ×16 configuration mapping, VCAP capacitor sizing for reliable AutoStore, RTC interrupt routing via INT pin, and HSB-driven hardware STORE timing compliance.

Technical Context

The device integrates SRAM and QuantumTrap nonvolatile storage in a monolithic IC, enabling parallel STORE/RECALL of all 131,072 bytes. STORE is triggered by power loss (AutoStore), software command, or HSB assertion; RECALL occurs automatically at power-up or via software.

RTC functionality includes leap-year tracking, programmable oscillator calibration, and independent alarm/watchdog timers with interrupt output on INT pin. Backup is supported either by capacitor (VRCTcap) or battery (VRTCbat), with automatic switchover and 0.35 µA typical retention current.

Key Specifications

Pinout & Package

Package: 44-pin TSOP II (Type 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 FM31L278-G, CY14B101KA-SP45XIT uniquely combines hands-off AutoStore, 1M STORE cycles, and full-featured RTC in a single 44-pin TSOP-reducing design complexity, board space, and qualification effort for industrial time-critical logging.

Availability

CY14B101KA-SP45XIT is available at Aetrix Electronics and suitable for industrial data loggers, smart energy meters, programmable logic controllers, and railway signaling controllers requiring stable component supply and long-term lifecycle support.

Supply support for CY14B101KA-SP45XIT 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 expertise in nonvolatile memory and timing solutions.

The CY14B series targets mission-critical systems needing zero-data-loss memory persistence and autonomous timekeeping-specifically engineered for industrial automation, utility infrastructure, and safety-certified control equipment.

FAQ

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

The datasheet specifies a minimum 4.7 µF tantalum or ceramic capacitor on VCAP for 45 ns devices. At 45 ns access time, the device requires sufficient charge to complete STORE within 20 ms; undersized capacitors cause partial or failed STOREs, corrupting nvSRAM contents. Derating to 10 µF is recommended for extended temperature range operation.

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

Yes-the RTC runs continuously from its dedicated backup supply (VRCTcap or VRTCbat) regardless of SRAM activity. Clock counting, alarm comparison, and watchdog timing proceed uninterrupted during read/write cycles, STORE, or RECALL operations, as confirmed by functional testing in the datasheet's RTC Operation section.

Is the CY14B101KA-SP45XIT pin-compatible with the CY14B101MA variant?

No-CY14B101KA (×8) and CY14B101MA (×16) have different pinouts: KA uses A0–A16 and DQ0–DQ7; MA uses A0–A15, DQ0–DQ15, and adds BHE/ BLE pins. The 44-pin TSOP II package for KA does not map to the 54-pin TSOP II used for MA, making them physically and electrically incompatible.

How is the HSB pin used to initiate a hardware STORE, and what timing constraints apply?

HSB initiates STORE when pulled LOW for ≥100 ns (tHSH) while CE and WE are HIGH and VCC > VSWITCH. After initiation, HSB is driven LOW for tHHHD (max 20 µs) to indicate busy status. The host must wait until HSB returns HIGH before issuing new commands-this ensures completion of the STORE sequence to QuantumTrap elements.