Infineon Technologies CY14B101KA-SP25XI

Overview

CY14B101KA-SP25XI 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 25 ns access time, supports AutoStore on power-down via VCAP capacitor, and provides full RTC functions including alarm, watchdog timer, and 0.35 µA typical RTC backup current - deployed in industrial data loggers and metering systems.

For engineers reviewing the CY14B101KA-SP25XI datasheet, CY14B101KA-SP25XI pinout, CY14B101KA-SP25XI application, or CY14B101KA-SP25XI equivalent, key selection criteria include ×8 vs ×16 configuration mapping, HSB-controlled hardware STORE timing, VRTCcap/VRTCbat dual RTC backup options, and QuantumTrap endurance (1M STORE cycles, 20-year data retention).

Technical Context

The device integrates a standard SRAM array with parallel-connected QuantumTrap nonvolatile elements, enabling simultaneous STORE/RECALL across all 131,072 bytes. Its RTC subsystem includes a 32.768 kHz crystal oscillator (Xin/Xout), programmable alarm interrupt, and watchdog timer with independent register space.

AutoStore activation relies on internal voltage monitoring of VCC against VSWITCH threshold; when breached, the chip isolates VCAP and initiates STORE using stored charge. The HSB pin serves dual role: input to trigger hardware STORE and open-drain output indicating STORE/RECALL busy status.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with STK15C88-3LF35 and FM31L278-G, CY14B101KA-SP25XI uniquely combines sub-30 ns SRAM speed, autonomous AutoStore, and full RTC feature set in a single monolithic package - reducing system complexity and qualification effort for time-critical industrial designs.

Availability

CY14B101KA-SP25XI is available at Aetrix Electronics and suitable for industrial data loggers, smart electricity meters, and PLC configuration memory requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for CY14B101KA-SP25XI 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.

CY14B101KA belongs to Cypress's nvSRAM product line, engineered to replace battery-backed SRAM and discrete RTC + memory combinations in mission-critical systems demanding zero-data-loss power failover.

FAQ

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

The CY14B101KA-SP25XI requires a minimum 4.7 µF tantalum capacitor on VCAP to guarantee successful STORE during VCC dropout. Ceramic capacitors are not recommended due to higher leakage; ESR must be ≤5 Ω. Derating to 10 µF is advised for designs operating at temperature extremes or with marginal VCC ramp rates.

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 delay RTC functions including alarm generation, time updates, or watchdog counting. Both subsystems operate concurrently with no arbitration overhead.

How is the ×8 configuration distinguished from ×16 in pinout and addressing?

The CY14B101KA uses ×8 organization: A0–A16 address 131,072 bytes, DQ0–DQ7 carry data, and BHE/ BLE are absent. In contrast, CY14B101MA uses ×16: A0–A15 address 65,536 words, DQ0–DQ15 carry data, and BHE/ BLE control upper/lower byte lanes - confirmed by pin diagrams and truth tables in Rev. *P datasheet.

Is software RECALL supported, and what is its typical latency?

Yes - software RECALL is initiated by writing 0x00 to address 0x0000 and 0xFF to address 0x0001. The operation completes in ≤20 ms, during which HSB remains LOW and SRAM access is inhibited. RECALL restores the entire 128K × 8 array from QuantumTrap cells to SRAM, preserving data integrity across power cycles.