Infineon Technologies CY14B101KA-SP25XIT

Overview

CY14B101KA-SP25XIT 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. It delivers 25 ns access time, supports AutoStore on power-down via VCAP capacitor, and includes RTC features: alarm, watchdog timer, and 0.35 µA typical backup current. Used in industrial data loggers where timestamped, lossless memory retention is critical.

For engineers reviewing the CY14B101KA-SP25XIT datasheet, CY14B101KA-SP25XIT pinout, CY14B101KA-SP25XIT application, or CY14B101KA-SP25XIT equivalent, key selection criteria include ×8 vs ×16 configuration mapping, VCAP sizing for reliable AutoStore, RTC interrupt routing (INT pin), and HSB timing for hardware-triggered STORE cycles.

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 uses a 32.768 kHz crystal (Xin/Xout) and supports leap-year tracking, programmable alarms (minutes/hours/days/months), and a watchdog timer with configurable timeout.

Power management includes dual RTC backup options-capacitor (VRCTcap) or battery (VRCTbat)-with automatic switchover. The AutoStore function initiates STORE when VCC drops below VSWITCH, using charge stored on VCAP to complete nonvolatile write without host intervention.

Key Specifications

Pinout & Package

Package: 44-pin Thin Small Outline Package (TSOP II), RoHS-compliant, 0.8 mm pitch, 10.16 mm × 18.42 mm footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STK14CA8-3AJ3F and FM31L278-G, CY14B101KA-SP25XIT uniquely combines hands-off AutoStore, 25 ns speed, and integrated watchdog-making it optimal for systems where host intervention during power failure is unreliable or unavailable.

Availability

CY14B101KA-SP25XIT is available at Aetrix Electronics and suitable for industrial data loggers, smart energy meters, and factory automation PLCs requiring stable component supply, long-life RTC functionality, and guaranteed nonvolatile memory retention without battery maintenance.

Supply support for CY14B101KA-SP25XIT 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.

This device belongs to Cypress's nvSRAM product line, engineered specifically for mission-critical applications demanding zero-data-loss memory persistence and autonomous timekeeping under unpredictable power conditions.

FAQ

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

The datasheet specifies a minimum 4.7 µF tantalum capacitor on VCAP for guaranteed AutoStore functionality at worst-case temperature and voltage. Lower values may work under benign conditions but risk incomplete STORE during rapid VCC collapse or elevated temperature. Ceramic capacitors are not recommended due to DC bias derating and insufficient capacitance stability.

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

Yes-the RTC runs autonomously from the SRAM array. Clock updates, alarm comparisons, and watchdog counting continue uninterrupted during SRAM reads/writes. However, STORE and RECALL operations halt both SRAM access and RTC register updates until completion, as they share internal power and control resources.

Is the CY14B101KA-SP25XIT pin-compatible with the CY14B101MA variant?

No-CY14B101KA (×8) and CY14B101MA (×16) differ in address/data pin mapping: KA uses A0–A16 and DQ0–DQ7; MA uses A0–A15 and DQ0–DQ15 with BHE/BLE pins. Their 44-pin TSOP II footprints are identical, but signal assignments and internal organization are incompatible; PCB layout must match the selected variant.

How is the watchdog timer reset, and what happens on timeout?

The watchdog is reset by writing any value to the WDT_CLEAR register. On timeout, it asserts the INT pin and sets the WDT_FLAG bit; if enabled, it also triggers a system reset via the RSTOUT pin (not present on this package-requires CY14B101KA-SP25XI with 54-pin TSOP). No automatic STORE occurs on watchdog timeout; that must be handled separately by firmware or AutoStore.