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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Cypress Semiconductor Corp CY14B256KA-SP25XI

Name: CY14B256KA-SP25XI
Brand: Cypress Semiconductor Corp
SKU: CY14B256KA-SP25XI
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CY14B256KA-SP25XI

Manufacturer:: Cypress Semiconductor Corp

Category:: Memory

Package:: 48-BSSOP (0.295", 7.50mm Width)

Datasheet:: CY14B256KA-SP25XI.pdf

Description:: IC NVSRAM 256KBIT PAR 48SSOP

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Product details

Overview

CY14B256KA-SP25XI from Infineon Technologies (formerly Cypress) is a 256-Kbit (32 K × 8) nonvolatile SRAM with integrated real-time clock, delivering 25 ns access time, infinite SRAM read/write cycles, and 1 million STORE cycles to QuantumTrap nonvolatile elements. It operates at 3.0 V ±10% over industrial temperature range and integrates RTC with alarm, watchdog timer, and capacitor-backed timekeeping for embedded data logging and power-fail-safe systems.

For engineers reviewing the CY14B256KA-SP25XI datasheet, CY14B256KA-SP25XI pinout, CY14B256KA-SP25XI application, or CY14B256KA-SP25XI equivalent, key selection criteria include AutoStore timing under voltage drop, RTC backup current (0.35 µA typ), HSB-controlled hardware STORE latency, and SSOP-48 package compatibility with legacy SRAM footprints.

Technical Context

The device integrates SRAM and QuantumTrap nonvolatile storage in a single die, enabling parallel STORE/RECALL across all 32,768 bytes without address sequencing. Its RTC subsystem includes leap-year tracking, programmable alarm intervals (minutes/hours/days/months), and a watchdog timer with interrupt output on the INT pin.

AutoStore activation relies on internal voltage monitoring of VCC against VSWITCH threshold, triggering capacitor-powered STORE via VCAP; software STORE uses address-based command sequences, while hardware STORE initiates on HSB pin assertion - all conditional on prior SRAM write activity since last STORE/RECALL cycle.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Density	256 Kbit (32 K × 8) - supports byte-wide interface with full SRAM-like random access
Access Time	25 ns - enables direct replacement in high-speed microcontroller bus interfaces without wait states
Nonvolatile Endurance	1 million STORE cycles - defines maximum safe power-loss event count before QuantumTrap wear-out
RTC Backup Current	0.35 µA (typ) - determines minimum capacitor size (e.g., 4.7 µF) for >100-hour RTC hold-up
Operating Voltage	3.0 V +20%, –10% - compatible with standard 3.3 V supply rails with ±10% tolerance margin
Data Retention	20 years at +85°C - guarantees long-term archival integrity without battery or refresh
Package	48-pin SSOP - 0.635 mm pitch, 15.4 mm × 7.6 mm footprint matching industry-standard nvSRAM layouts

Pinout & Package

48-pin shrink small-outline package (SSOP), RoHS-compliant, with exposed pad not present. Pin functions validated per Cypress document 001-55720 Rev. *I.

Pin/Terminal	Circuit Role	Design Meaning
A0–A14	Address Input	15-bit address bus for 32 Kbyte addressing; no multiplexing required
DQ0–DQ7	Bidirectional Data I/O	Byte-wide data path; tristated when OE HIGH or during STORE/RECALL
WE, CE, OE	Control Inputs	Standard SRAM control logic: write enable, chip enable, output enable - fully compatible with MPU bus timing
HSB	I/O Busy/Request	Open-drain status indicator and hardware STORE trigger; requires external pull-up if used as input
VCAP	Power Supply	Capacitor connection point for AutoStore energy reserve; regulated internally from VCC
VRTCcap / VRTCbat	RTC Backup Supply	Selective RTC backup: capacitor-only (V_RTCcap) or battery (V_RTCbat) - mutually exclusive use
INT	Interrupt Output	Programmable active-HIGH push-pull or active-LOW open-drain output for RTC alarm/watchdog events
Xin/Xout	Crystal Interface	32.768 kHz crystal oscillator terminals; supports external tuning capacitor for ±20 ppm accuracy

Key Features

Feature	Design Value
Hands-off AutoStore	Automatic STORE triggered by VCC drop below VSWITCH using charge stored on external VCAP capacitor - no firmware intervention required
QuantumTrap Nonvolatility	Monolithic integration of SRAM and nonvolatile storage eliminates external EEPROM/NVRAM and associated wear-leveling firmware
RTC with Leap-Year Tracking	Fully autonomous calendar engine maintains accurate date/time including February 29 handling - reduces host MCU RTC driver complexity
Conditional STORE Logic	Hardware and AutoStore operations only execute if at least one SRAM write occurred since last STORE/RECALL - prevents unnecessary nonvolatile writes
Flexible RTC Backup	Supports either low-leakage capacitor (V_RTCcap) or coin-cell battery (V_RTCbat) - enables cost-optimized or long-life design choices

Applications

Industrial Data Logger

Smart Metering

Use Scenario: Continuous sensor data capture with periodic power cycling or brownout events.

IC Role / Device Role / Timing Role: Nonvolatile memory buffer and timestamp source - stores latest readings and logs time-of-failure during power loss.

Use Value: Eliminates need for external backup battery + EEPROM combo; RTC alarm triggers scheduled meter reads every 15 minutes.

Use Scenario: Utility meter retaining consumption history and tariff schedules across grid outages.

IC Role / Device Role / Timing Role: Dual-role device: nvSRAM holds billing data; RTC provides tamper-proof time-stamping for load profiles.

Use Value: 20-year data retention meets ANSI C12.1 compliance; 0.35 µA RTC current extends supercapacitor life beyond 10 years.

Medical Diagnostic Equipment

PLC Controller Module

Use Scenario: Ultrasound or ECG devices capturing transient waveform buffers before final storage to flash.

IC Role / Device Role / Timing Role: High-speed SRAM front-end with instantaneous STORE on AC power failure - preserves last diagnostic session.

Use Value: 25 ns access enables real-time waveform overlay; AutoStore completes within 20 ms using 4.7 µF VCAP capacitor.

Use Scenario: Programmable logic controller maintaining ladder logic state and I/O timestamps during factory line power dips.

IC Role / Device Role / Timing Role: Fault-tolerant memory for runtime variables and watchdog-triggered safe-state recovery.

Use Value: HSB pin allows PLC CPU to initiate STORE on detected fault condition; watchdog timer resets stalled processes without host intervention.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STK14CA8-3LF35I	256 Kbit nvSRAM + RTC; 45 ns access; uses BBSRAM architecture with lithium battery backup	Requires soldered coin cell; no capacitor-based AutoStore; higher RTC backup current (1.0 µA)	Choose when long-term RTC operation (>10 years) is prioritized over capacitor-only simplicity
FM24V02-G	64 Kbit F-RAM with integrated RTC; 55 ns access; unlimited endurance; no STORE/RECALL latency	Lower density; no AutoStore on power loss; RTC lacks alarm and watchdog features	Choose when infinite write endurance dominates over RTC feature set and memory size

Compared with STK14CA8-3LF35I and FM24V02-G, CY14B256KA-SP25XI uniquely combines 25 ns speed, capacitor-backed AutoStore, full RTC feature set, and 256 Kbit density - making it optimal for industrial controllers requiring deterministic power-fail response and time-stamped diagnostics.

Availability

CY14B256KA-SP25XI is available at Aetrix Electronics and suitable for industrial data loggers, smart metering systems, medical diagnostic equipment, and PLC controller modules requiring stable component supply and long-term lifecycle support.

Supply support for CY14B256KA-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

Infineon Technologies is a global semiconductor leader headquartered in Munich, Germany, specializing in power management, automotive, industrial, and security solutions.

CY14B256KA belongs to Infineon's legacy nvSRAM product line - designed specifically for mission-critical applications where data integrity during power interruption and precise timekeeping must coexist in a single monolithic IC.

FAQ

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

The datasheet specifies a minimum 0.1 µF ceramic capacitor on VCAP for basic functionality, but 4.7 µF is recommended to ensure successful STORE completion across full industrial temperature range (–40°C to +85°C) and worst-case VCC droop profiles. Lower values risk incomplete STORE and data corruption.

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

Yes - the RTC runs autonomously from the SRAM array using its dedicated oscillator and backup supply (V_RTCcap or V_RTCbat). SRAM read/write operations, STORE, and RECALL do not stall or reset the RTC counter, alarm, or watchdog timer.

Is the CY14B256KA-SP25XI pin-compatible with standard 32 K × 8 SRAMs?

It is functionally pin-compatible with industry-standard 48-pin SSOP SRAMs (e.g., IS61LV256AL) for address, data, and core control pins (CE, OE, WE), but requires attention to VCAP, HSB, INT, and RTC pins - unused RTC pins must be left unconnected or tied per datasheet guidance to avoid leakage paths.

How does the conditional STORE logic prevent unnecessary nonvolatile writes?

The device tracks whether any SRAM write has occurred since the last STORE or RECALL cycle. AutoStore and Hardware STORE are suppressed unless this "write latch" is set - eliminating redundant STOREs during idle periods and extending QuantumTrap endurance to its rated 1 million cycles.

CY14B256KA-SP25XI Specifications

Product attributes: Attribute value

Manufacturer:: Cypress Semiconductor Corp

Series:: -

Package/Case:: 48-BSSOP (0.295", 7.50mm Width)

Packaging:: Tube

Product Status:: Active

Programmable:: Not Verified

Memory Type:: Non-Volatile

Memory Format:: NVSRAM

Technology:: NVSRAM (Non-Volatile SRAM)

Memory Size:: 256Kbit

Memory Organization:: 32K x 8

Memory Interface:: Parallel

Clock Frequency:: -

Write Cycle Time - Word, Page:: 25ns

Access Time:: 25 ns

Voltage - Supply:: 2.7V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 48-SSOP

CY14B256KA-SP25XI FAQ

1.How can I place an order for CY14B256KA-SP25XI through Aetrix?

Please submit a Request for Quotation (RFQ) for CY14B256KA-SP25XI on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for CY14B256KA-SP25XI reliable?

The price and inventory of CY14B256KA-SP25XI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY14B256KA-SP25XI is usually 5 days.

3.What payment methods are accepted for CY14B256KA-SP25XI?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY14B256KA-SP25XI transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CY14B256KA-SP25XI?

CY14B256KA-SP25XI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CY14B256KA-SP25XI order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for CY14B256KA-SP25XI?

For technical support, including CY14B256KA-SP25XI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY14B256KA-SP25XI requirements.

6.How does Aetrix verify that CY14B256KA-SP25XI is sourced from the original manufacturer or authorized distributors?

All CY14B256KA-SP25XI products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CY14B256KA-SP25XI meets industry standards.

7.What is the process for return or replacement of CY14B256KA-SP25XI?

All CY14B256KA-SP25XI units undergo pre-shipment inspection (PSI). If there is an issue with CY14B256KA-SP25XI, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The CY14B256KA-SP25XI part is unused and in its original packaging.

Return procedure for CY14B256KA-SP25XI:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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