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Infineon Technologies CY14B256KA-SP25XIT
- Part No.:
- CY14B256KA-SP25XIT
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
CY14B256KA-SP25XIT.pdf
- Description:
- IC NVSRAM 256KBIT PAR 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,919
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Product details
Overview
CY14B256KA-SP25XIT 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 data-logging systems in power-constrained industrial controllers.
For engineers reviewing the CY14B256KA-SP25XIT datasheet, CY14B256KA-SP25XIT pinout, CY14B256KA-SP25XIT application, or CY14B256KA-SP25XIT equivalent, key selection criteria include AutoStore timing under voltage drop, RTC backup current (0.35 µA typ), VCAP capacitor sizing for reliable power-loss store, and HSB pin behavior during concurrent SRAM writes.
Technical Context
The device integrates SRAM and QuantumTrap nonvolatile storage in a single monolithic die, enabling parallel STORE/RECALL across all 32,768 bytes without address sequencing. Its RTC subsystem includes leap-year tracking, programmable oscillator calibration, and dual backup paths (VCAP or VRTCbat).
AutoStore activation is triggered by VCC falling below VSWITCH, initiating a capacitor-powered STORE using charge stored on the VCAP pin; software STORE uses an address-based write sequence, while hardware STORE is initiated via HSB pin assertion - all inhibit SRAM access until completion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 Kbit (32 K × 8) - supports byte-wide interface with full SRAM compatibility |
| Access Time | 25 ns - enables direct replacement of standard fast SRAM in legacy 8-bit microcontroller buses |
| Nonvolatile Endurance | 1 million STORE cycles - defines maximum safe frequency of power-loss-triggered data preservation |
| Data Retention | 20 years at +85°C - guarantees long-term archival integrity without battery or refresh |
| RTC Backup Current | 0.35 µA (typ) - allows operation from small backup capacitors (e.g., 0.1 µF) for >100 hours at 3.0 V |
| Supply Voltage | 3.0 V +20%, –10% - compatible with unregulated 3.3 V rails and brown-out tolerant designs |
| Operating Temperature | –40°C to +85°C - validated for industrial control cabinets and outdoor metering enclosures |
Pinout & Package
48-pin shrink small-outline package (SSOP), RoHS-compliant, with exposed pad not present. Pin layout optimized for decoupling VCC/VCAP and isolation of RTC analog inputs (Xin/Xout, VRTCcap, VRTCbat) from digital noise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Input | 15-bit address bus supporting full 32 Kbyte addressing without banking logic |
| DQ0–DQ7 | Bidirectional Data I/O | True 8-bit parallel interface; tristates automatically when OE HIGH or during STORE/RECALL |
| WE, CE, OE | Control Inputs | Standard SRAM control set - no additional protocol overhead for integration into existing memory controllers |
| HSB | I/O Status & Trigger | Open-drain busy indicator and hardware STORE initiator; requires external pull-up if used as input |
| Xin/Xout | RTC Crystal Interface | Direct connection to 32.768 kHz tuning-fork crystal; internal oscillator eliminates external buffer need |
| VCAP | AutoStore Energy Reservoir | Connects to external capacitor (0.1 µF typical) that powers STORE during VCC collapse |
| VRTCcap / VRTCbat | RTC Backup Supply | Exclusive selection: capacitor-only (VCAP) or battery-backed (VRTCbat) RTC retention path |
| INT | Programmable Interrupt Output | Configurable active-HIGH push-pull or active-LOW open-drain; signals alarm, watchdog timeout, or power monitor event |
Key Features
| Feature | Design Value |
|---|---|
| QuantumTrap Nonvolatile Storage | Enables infinite SRAM read/write cycles while preserving data across unlimited power cycles without wear leveling logic |
| AutoStore on Power Loss | Eliminates need for external power-fail detection circuitry - stores entire SRAM contents autonomously when VCC drops below threshold |
| Integrated RTC with Alarm & Watchdog | Reduces BOM count by replacing discrete RTC + timer IC; supports periodic interrupts down to minute granularity |
| Capacitor-Backed RTC | Allows maintenance of accurate timekeeping for >100 hours using only a 0.1 µF ceramic capacitor - no battery required |
| Hardware STORE Busy Signal (HSB) | Provides deterministic synchronization between host processor and nvSRAM store completion - avoids polling or fixed delays |
Applications
| Industrial Data Logger | Smart Electricity Meter |
|---|---|
Use Scenario: Continuous recording of sensor readings during mains power interruption. IC Role / Device Role / Timing Role: Nonvolatile memory + time-stamped event recorder with autonomous power-loss store. Use Value: Preserves last valid measurement and timestamp even during sudden AC dropout, enabling gap-free energy consumption history. | Use Scenario: Tamper-proof accumulation of kWh usage with time-of-use billing intervals. IC Role / Device Role / Timing Role: RTC-synchronized data vault with secure, battery-free nonvolatile storage. Use Value: Maintains accurate billing timestamps and cumulative registers for >20 years without lithium battery replacement or recalibration. |
| PLC I/O Module | Building Automation Controller |
Use Scenario: Storing configuration parameters and last-known actuator states before emergency shutdown. IC Role / Device Role / Timing Role: Configuration EEPROM replacement with SRAM-speed access and deterministic STORE latency. Use Value: Enables sub-100 µs STORE initiation upon brown-out detection, preventing state corruption during controlled stop sequences. | Use Scenario: Logging HVAC runtime, temperature setpoints, and occupancy events across seasonal power outages. IC Role / Device Role / Timing Role: Time-aware nonvolatile scratchpad with alarm-driven schedule execution. Use Value: Executes daily fan schedules and logs maintenance alerts using internal RTC - no external time source needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nvSRAM+RTC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STK14C88-3AJ5F | 55 ns access time; uses NVSRAM with older SONOS technology; no integrated RTC | Requires external RTC IC and power-fail supervisor; higher STORE latency | Select when RTC functionality is handled separately and cost sensitivity outweighs timing performance |
| FM24V10-G | F-RAM-based 1 Mbit memory; 45 ns access; integrated RTC; 10-year data retention | Lower endurance (10¹⁴ reads/writes) but faster STORE; no VCAP capacitor needed | Select for high-write-frequency logging where 20-year retention is not mandatory |
Compared with STK14C88-3AJ5F and FM24V10-G, CY14B256KA-SP25XIT uniquely combines 25 ns SRAM speed, 20-year quantum-trap retention, and fully integrated RTC - eliminating external components while guaranteeing deterministic STORE timing under voltage collapse.
Availability
CY14B256KA-SP25XIT is available at Aetrix Electronics and suitable for industrial data loggers, smart electricity meters, PLC I/O modules, and building automation controllers requiring stable component supply with guaranteed 20-year data retention and capacitor-backed RTC operation.
Supply support for CY14B256KA-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
Infineon Technologies is a global semiconductor leader headquartered in Munich, Germany, specializing in power management, automotive, industrial, and IoT solutions with emphasis on reliability and system-level integration.
This device belongs to Infineon's nvSRAM product line, designed specifically for mission-critical industrial systems requiring zero-data-loss memory persistence and autonomous timekeeping without batteries or external supervision.
FAQ
What is the minimum VCAP capacitance required for reliable AutoStore operation?
The datasheet specifies a nominal 0.1 µF ceramic capacitor on VCAP for guaranteed AutoStore functionality across the full industrial temperature range. Using smaller values risks incomplete STORE under low-temperature or high-leakage conditions. The capacitor must be placed within 5 mm of the VCAP pin with short, low-inductance traces to minimize voltage droop during discharge.
Can the RTC operate independently while the SRAM is being accessed?
Yes - the RTC runs continuously from its dedicated backup supply (VCAP or VRTCbat) and is fully asynchronous to SRAM operations. Clock updates, alarm comparisons, and watchdog counting proceed without interference during active memory reads or writes, ensuring precise timekeeping regardless of host bus activity.
How does the HSB pin behave during a Software STORE sequence?
During a Software STORE, HSB is driven LOW immediately after the address sequence is recognized and remains LOW until STORE completion. This provides hardware-synchronized status indication identical to Hardware STORE, allowing the host processor to wait on HSB rather than rely on fixed timing delays or polling the status register.
Is the CY14B256KA-SP25XIT compatible with legacy CY14B256KA designs?
Yes - the -SP25XIT suffix denotes the same 48-pin SSOP package, 25 ns access time, and identical pinout and electrical specifications as the base CY14B256KA. It is a direct replacement with no PCB or firmware changes required, maintaining full backward compatibility for existing industrial designs.
CY14B256KA-SP25XIT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SP25XIT FAQ
1.How can I place an order for CY14B256KA-SP25XIT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY14B256KA-SP25XIT 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-SP25XIT reliable?
The price and inventory of CY14B256KA-SP25XIT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY14B256KA-SP25XIT is usually 5 days.
3.What payment methods are accepted for CY14B256KA-SP25XIT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY14B256KA-SP25XIT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY14B256KA-SP25XIT?
CY14B256KA-SP25XIT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY14B256KA-SP25XIT 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-SP25XIT?
For technical support, including CY14B256KA-SP25XIT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY14B256KA-SP25XIT requirements.
6.How does Aetrix verify that CY14B256KA-SP25XIT is sourced from the original manufacturer or authorized distributors?
All CY14B256KA-SP25XIT 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-SP25XIT meets industry standards.
7.What is the process for return or replacement of CY14B256KA-SP25XIT?
All CY14B256KA-SP25XIT units undergo pre-shipment inspection (PSI). If there is an issue with CY14B256KA-SP25XIT, 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-SP25XIT part is unused and in its original packaging.
Return procedure for CY14B256KA-SP25XIT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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