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Infineon Technologies CY14E256L-SZ45XI
- Part No.:
- CY14E256L-SZ45XI
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 32-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY14E256L-SZ45XI.pdf
- Description:
- IC NVSRAM 256KBIT PAR 32SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,226
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Product details
Overview
CY14E256L-SZ45XI from Cypress Semiconductor is a 256 Kbit (32K × 8) nonvolatile static RAM with QuantumTrap technology, functioning as a drop-in SRAM replacement with integrated nonvolatile storage. It delivers 45 ns access time, operates on single 5V ±10% supply, and supports AutoStore on power loss using an external 68 µF capacitor at VCAP. Used in industrial control systems requiring persistent memory retention without battery backup.
For engineers reviewing the CY14E256L-SZ45XI datasheet, CY14E256L-SZ45XI pinout, CY14E256L-SZ45XI application, or CY14E256L-SZ45XI equivalent, key selection criteria include STORE/RECALL control modes (hardware/software/AutoStore), VCAP capacitor sizing, HSB timing behavior, and compatibility with legacy STK14C88-based designs.
Technical Context
The CY14E256L-SZ45XI integrates parallel SRAM and QuantumTrap nonvolatile cells per bit, enabling simultaneous STORE/RECALL of all 32,768 bytes. It uses a charge-pump-driven VCAP pin to sustain STORE during VCC dropout, with automatic initiation when VCC falls below VSWITCH (typically 3.6 V).
STORE operations are conditional: hardware (HSB-triggered) and AutoStore require at least one prior WRITE since last STORE/RECALL; software STORE bypasses this condition. RECALL occurs automatically on power-up or via six-address CE-controlled READ sequence ending at 0x0C63.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 Kbit (32K × 8) - provides byte-wide interface compatible with 8-bit microcontrollers and legacy bus architectures. |
| Access Time | 45 ns - defines maximum clock-to-data valid delay for read cycles under 5V operation, meeting real-time industrial controller timing budgets. |
| Nonvolatile Endurance | 1,000,000 STORE cycles - limits field-replaceable unit lifetime in high-frequency logging applications where STORE triggers per event. |
| Data Retention | 100 years at 25°C - ensures long-term data integrity in unpowered storage for black-box recorders and safety-critical logs. |
| VCC Supply Range | 5V ±10% (4.5V–5.5V) - constrains system power design to regulated 5V rails; no support for 3.3V or dual-voltage operation. |
| VCAP Capacitor | 68 µF minimum - sets minimum bulk capacitance required to complete full STORE within 10 ms before VCC drops below 3.6V. |
| Operating Temperature | –40°C to +85°C - qualifies for industrial-grade deployment in motor drives, PLCs, and outdoor metering equipment. |
Pinout & Package
32-pin Small Outline Integrated Circuit (SOIC) package, RoHS-compliant, 300-mil body width, surface-mount compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Input | 15-bit address bus supporting full 32K-byte addressing; requires stable setup before CE/WE assertion. |
| DQ0–DQ7 | Bidirectional Data I/O | 8-bit data bus shared for read/write; tri-stated when OE HIGH or during STORE/RECALL. |
| CE (E) | Chip Enable | Active-low chip select; controls device enable and initiates software STORE/RECALL sequences via CE-controlled reads. |
| WE (W) | Write Enable | Active-low write strobe; must remain HIGH during STORE/RECALL to prevent bus contention. |
| OE (G) | Output Enable | Active-low output driver control; disables outputs during writes and nonvolatile operations. |
| HSB | Hardware Store Busy | Open-drain status/output pin: driven LOW during any STORE; pulled LOW externally to initiate hardware STORE. |
| VCAP | AutoStore Capacitor Terminal | Internal charge-pump output; connects to external 68–220 µF capacitor to sustain STORE during VCC collapse. |
| VCC | Power Supply | 5V ±10% main supply; disconnects from VCAP when VCC < VSWITCH (~3.6V) to trigger AutoStore. |
| VSS | Ground | System ground reference; must be low-impedance return path for SRAM and QuantumTrap switching currents. |
Key Features
| Feature | Design Value |
|---|---|
| QuantumTrap Nonvolatile Cell | Enables true nvSRAM functionality-no external battery or EEPROM emulation-by embedding nonvolatile storage directly in each SRAM cell. |
| Three STORE Initiation Modes | Supports flexible system-level persistence: AutoStore (power-loss), HSB-triggered (hardware interrupt), or software-addressed (deterministic control). |
| Conditional AutoStore | Prevents unnecessary STORE cycles by requiring at least one WRITE since last STORE/RECALL-reducing wear and extending endurance. |
| Unlimited RECALL Cycles | Allows repeated restoration of nonvolatile data to SRAM without degradation-critical for boot-time configuration reload or fault recovery. |
| Pin Compatibility with STK14C88 | Enables direct replacement in existing designs without PCB redesign-preserving layout, routing, and firmware timing assumptions. |
Applications
| Industrial PLC Data Logging | Medical Device Event Recorder |
|---|---|
Use Scenario: Captures sensor readings and operational states during mains power interruption in programmable logic controllers. IC Role / Device Role / Timing Role: Acts as primary working memory with automatic STORE on brownout, preserving last known state for safe restart. Use Value: Eliminates need for supercapacitor charging circuitry or battery management while guaranteeing 100-year data retention of critical trip logs. | Use Scenario: Stores ECG waveform snapshots and alarm timestamps in portable diagnostic devices operating on intermittent power. IC Role / Device Role / Timing Role: Serves as fault-tolerant buffer memory that recalls validated clinical data on power-up without host CPU intervention. Use Value: Ensures regulatory compliance for data persistence in Class II medical devices by delivering deterministic RECALL within tHRECALL (max 20 ms). |
| Automotive Telematics Black Box | Smart Grid Meter Firmware Storage |
Use Scenario: Records vehicle bus activity and crash-event parameters in ADAS modules subject to rapid VCC collapse during collision. IC Role / Device Role / Timing Role: Provides fail-safe memory with AutoStore triggered at VCC = 3.6V, completing STORE within 10 ms using stored VCAP energy. Use Value: Meets ISO 16750-2 pulse 4 requirements for voltage drop immunity without external power-fail detection circuitry. | Use Scenario: Holds firmware update images and calibration constants in electricity meters exposed to grid surges and outages. IC Role / Device Role / Timing Role: Functions as secure, wear-resistant code/data storage-supporting over 1M STORE cycles across 15+ year field life. Use Value: Reduces BOM cost versus FRAM+EEPROM combinations while maintaining IEC 62056-6-2 data integrity certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STK14C88-35I | 35 ns access time; no internal charge pump-requires external voltage monitor and control logic for STORE initiation. | Lacks AutoStore; relies on discrete power-fail detection and manual STORE triggering-increases system complexity and component count. | Select only if legacy board space constraints prohibit VCAP capacitor placement or if 35 ns speed is mandatory and 45 ns is unacceptable. |
| FM24V02-G | F-RAM-based; 400 kHz I²C interface; 3.3V operation; unlimited endurance but lower density (2 Kbit). | Serial interface limits throughput; unsuitable for parallel-bus SRAM replacements; requires firmware rewrite for I²C protocol handling. | Choose only for new low-power, low-density applications where serial interface and zero write-delay are prioritized over pin compatibility and density. |
Compared with STK14C88-35I and FM24V02-G, the CY14E256L-SZ45XI uniquely combines parallel SRAM speed, integrated AutoStore autonomy, and pin-for-pin upgrade path-making it optimal for industrial retrofits where reliability, simplicity, and minimal firmware change are critical.
Availability
CY14E256L-SZ45XI is available at Aetrix Electronics and suitable for industrial PLCs, medical event recorders, automotive telematics black boxes, and smart grid meters requiring stable component supply with guaranteed long-term data retention.
Supply support for CY14E256L-SZ45XI 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 memory and programmable solutions for industrial, automotive, and communications markets.
The CY14E series targets applications needing battery-free nonvolatile memory with SRAM performance-specifically engineered for systems where power loss resilience, data integrity, and drop-in replaceability are mandatory.
FAQ
What is the minimum VCAP capacitance required for reliable AutoStore operation?
The CY14E256L-SZ45XI requires a minimum 68 µF tantalum or aluminum electrolytic capacitor rated ≥6V on the VCAP pin. This value ensures sufficient energy to complete the 10 ms STORE cycle when VCC drops from 5V to 3.6V. Capacitance below 68 µF risks incomplete STORE and data loss; values up to 220 µF are supported for extended hold-up time.
Can the CY14E256L-SZ45XI be used in a 3.3V system?
No. The CY14E256L-SZ45XI is specified exclusively for 5V ±10% operation (4.5V–5.5V). It lacks 3.3V logic compatibility, internal level-shifting, or dual-supply capability. Attempting to operate at 3.3V will result in failure to initialize, invalid STORE/RECALL behavior, and potential data corruption due to insufficient VCC margin for VSWITCH threshold detection.
How does the HSB pin behave during a software-initiated STORE?
During software-initiated STORE, the HSB pin is actively driven LOW by the CY14E256L-SZ45XI for the entire tSTORE duration (max 10 ms), identical to hardware or AutoStore. This allows external logic to monitor STORE progress regardless of initiation method. An external 10 kΩ pull-up to VCAP is required if HSB is used as a status indicator in the system.
Is the CY14E256L-SZ45XI still recommended for new designs?
No. Cypress documentation explicitly marks the CY14E256L as "Not Recommended for New Designs." While fully functional and supported for existing production, Infineon recommends migrating to newer nvSRAM families (e.g., CY14V108, CY14V116) offering improved speed, lower power, and extended temperature range. Lifecycle notifications and last-time-buy guidance apply.
CY14E256L-SZ45XI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 32-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 45ns
- Access Time:
- 45 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-SOIC
CY14E256L-SZ45XI FAQ
1.How can I place an order for CY14E256L-SZ45XI through Aetrix?
Please submit a Request for Quotation (RFQ) for CY14E256L-SZ45XI 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 CY14E256L-SZ45XI reliable?
The price and inventory of CY14E256L-SZ45XI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY14E256L-SZ45XI is usually 5 days.
3.What payment methods are accepted for CY14E256L-SZ45XI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY14E256L-SZ45XI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY14E256L-SZ45XI?
CY14E256L-SZ45XI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY14E256L-SZ45XI 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 CY14E256L-SZ45XI?
For technical support, including CY14E256L-SZ45XI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY14E256L-SZ45XI requirements.
6.How does Aetrix verify that CY14E256L-SZ45XI is sourced from the original manufacturer or authorized distributors?
All CY14E256L-SZ45XI 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 CY14E256L-SZ45XI meets industry standards.
7.What is the process for return or replacement of CY14E256L-SZ45XI?
All CY14E256L-SZ45XI units undergo pre-shipment inspection (PSI). If there is an issue with CY14E256L-SZ45XI, 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 CY14E256L-SZ45XI part is unused and in its original packaging.
Return procedure for CY14E256L-SZ45XI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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