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Infineon Technologies CY14B256PA-SFXIT
- Part No.:
- CY14B256PA-SFXIT
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY14B256PA-SFXIT.pdf
- Description:
- IC NVSRAM 256KBIT SPI 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,196
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Product details
Overview
CY14B256PA-SFXIT from Cypress Semiconductor is a 256-Kbit (32 K × 8) SPI nonvolatile SRAM with integrated real-time clock, AutoStore/RECALL functionality, and 40 MHz/104 MHz dual-speed SPI interface. It uses QuantumTrap nonvolatile technology for infinite SRAM write cycles and 1 million STORE cycles, supports capacitor-backed RTC with 0.45 µA typical backup current, and operates across 2.7–3.6 V at industrial temperature range.
For engineers reviewing the CY14B256PA-SFXIT datasheet, CY14B256PA-SFXIT pinout, CY14B256PA-SFXIT application, or CY14B256PA-SFXIT equivalent, key selection criteria include SPI mode 0/3 compatibility, hardware STORE via HSB pin, programmable square wave output (1 Hz to 32.768 kHz), RTC alarm/interrupt capability, and VCAP-based power-loss data retention.
Technical Context
This device integrates SRAM, QuantumTrap nonvolatile storage, and full-featured RTC in a single monolithic die. The memory array is strictly organized as 32 K × 8, accessed exclusively via SPI - no parallel interface. STORE/RECALL operations are decoupled from volatile access: SRAM reads/writes occur at full SPI speed (zero-cycle-delay at 40 MHz), while STORE transfers data to nonvolatile cells only during power-down or on command.
The RTC subsystem includes independent counters, alarm registers, watchdog timer, and interrupt logic routed to the INT/SQW pin. Backup is supported either by VRTCcap (capacitor) or VRTCbat (battery); both paths are mutually exclusive and share the same 0.45 µA typical quiescent current spec. Clock output frequency (1 Hz / 512 Hz / 4.096 kHz / 32.768 kHz) is software-selectable and fully functional without external crystal if using internal oscillator calibration mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory density | 256 Kbit (32 K × 8) - fixed linear address space, no bank switching required |
| SPI clock rate | Up to 40 MHz (standard read/write), 104 MHz (fast read only) - enables sub-µs access latency for critical logging |
| STORE endurance | 1 million cycles to QuantumTrap cells - defines maximum safe power-loss event count over product lifetime |
| Data retention | 20 years at +85 °C - guaranteed nonvolatile data hold without refresh under worst-case thermal stress |
| RTC backup current | 0.45 µA typical - determines minimum capacitor size (e.g., ≥1.0 F for >24 hr hold-up at 2.7 V) |
| Operating voltage | 2.7 V to 3.6 V - compatible with 3.3 V industrial logic rails and LDO outputs |
| Package | 16-pin SOIC (300 mil) - standard footprint for automated PCB assembly and legacy board replacement |
Pinout & Package
16-pin Small Outline Integrated Circuit (SOIC), 300-mil body width, RoHS-compliant, surface-mount package with standard JEDEC MS-012AC dimensions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select input | Active-low enable; drives device into standby mode when HIGH, disabling SPI and reducing current to 250 µA |
| SCK | Serial clock input | Edge-triggered SPI clock; rising edge latches SI, falling edge drives SO - supports modes 0 and 3 |
| SI | Serial input | Accepts all opcodes and data; used for WRITE, STORE, RDRTC, WRTC, and status register writes |
| SO | Serial output | Drives read data, status bits, RTC registers, and serial number; tri-stated when CS is HIGH |
| WP | Hardware write protect | Low-active pin that disables all memory and RTC write instructions except WREN/WRDI sequence |
| HSB | Hardware STORE Busy I/O | Open-drain output indicating STORE/RECALL progress; configurable as input to trigger hardware STORE on falling edge |
| VCAP | AutoStore capacitor supply | Connects to external capacitor (typically 47–100 µF) to sustain STORE during VCC dropout - must not be grounded |
| INT/SQW | Interrupt/square wave output | Programmable dual-function pin: generates RTC alarm/WDT interrupts or selectable-frequency square wave (1 Hz–32.768 kHz) |
| VCC | Primary power supply | 2.7–3.6 V main rail; powers SRAM core, SPI logic, and RTC control circuitry |
| VSS | Ground reference | System ground return path for all digital and analog blocks including RTC oscillator |
Key Features
| Feature | Design Value |
|---|---|
| QuantumTrap nonvolatile storage | Enables infinite SRAM write cycles while preserving data integrity across 1M STORE operations and 20-year retention |
| AutoStore on power loss | Guarantees data persistence without firmware intervention using only VCAP capacitor - eliminates battery dependency for memory backup |
| Dual-speed SPI interface | 40 MHz zero-wait-state operation for real-time logging; 104 MHz fast-read for rapid diagnostics or configuration dump |
| Integrated RTC with alarm & watchdog | Provides timestamping, scheduled wake-up, and system-level fault detection without external timing IC or microcontroller overhead |
| Programmable square wave output | Eliminates need for external clock generator by delivering precise 1 Hz, 512 Hz, 4.096 kHz, or 32.768 kHz signals directly from INT/SQW pin |
Applications
| Industrial Data Logger | Smart Metering Endpoint |
|---|---|
Use Scenario: Continuous sensor sampling with periodic power cycling in remote utility installations. IC Role / Device Role / Timing Role: Nonvolatile memory buffer + time-stamped event recorder with autonomous STORE on mains failure. Use Value: Preserves last 32 KB of readings across uncontrolled outages; RTC alarm triggers wake-up for scheduled transmission without MCU involvement. | Use Scenario: Electricity/gas/water meter with tamper detection and billing cycle logging. IC Role / Device Role / Timing Role: Secure storage for consumption registers and time-of-use tariffs; RTC provides accurate billing timestamps. Use Value: Meets ANSI C12.1/C12.20 compliance for timekeeping accuracy; VCAP-backed STORE ensures revenue data survives meter power removal. |
| Medical Diagnostic Device | PLC I/O Module |
Use Scenario: Portable ultrasound or ECG unit requiring persistent waveform buffers and FDA-mandated audit trails. IC Role / Device Role / Timing Role: High-reliability memory for patient session data; RTC supplies ISO 8601-compliant timestamps for regulatory traceability. Use Value: Eliminates EEPROM wear-out risk during frequent waveform saves; 20-year data retention satisfies medical device lifecycle requirements. | Use Scenario: Modular industrial controller with hot-swappable I/O cards needing deterministic state recovery after field power interruption. IC Role / Device Role / Timing Role: Fault-tolerant configuration store and runtime parameter snapshot; HSB pin synchronizes STORE with PLC safety shutdown sequence. Use Value: Enables <100 ms deterministic RECALL on power restoration - meets IEC 61131-2 response time requirements for safety-critical restart. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nvSRAM+RTC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| FM24V02A-G | 256 Kbit F-RAM with RTC; 3.0–3.6 V; no AutoStore capacitor needed; lower write current but no 104 MHz SPI | Lacks programmable square wave output and watchdog timer; uses internal ferroelectric storage instead of QuantumTrap | Preferred where ultra-low-power write energy and elimination of VCAP are critical, but advanced RTC features are secondary |
| DS1307+AT25256 | Discrete RTC + SPI EEPROM solution; requires external glue logic; 5.0 V only; no integrated STORE/RECALL automation | No hardware STORE/RECALL coordination; higher BOM count and PCB area; no zero-cycle-delay memory access | Only suitable for cost-sensitive legacy designs where Cypress's monolithic integration and reliability are not required |
Compared with FM24V02A-G and DS1307+AT25256, CY14B256PA-SFXIT uniquely combines high-speed SPI, hardware-coordinated STORE/RECALL, full RTC feature set, and 20-year data retention in one RoHS-compliant SOIC package - making it optimal for safety-critical, power-interrupted, and timestamp-dependent embedded systems.
Availability
CY14B256PA-SFXIT is available at Aetrix Electronics and suitable for industrial data loggers, smart metering endpoints, medical diagnostic devices, and PLC I/O modules requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.
Supply support for CY14B256PA-SFXIT 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-performance mixed-signal ICs for industrial, automotive, and IoT applications, with emphasis on reliability, low power, and system integration.
The CY14X256PA series targets applications demanding deterministic nonvolatile data capture and precise timekeeping without external support components - especially where power interruptions, regulatory audit trails, or field-upgrade resilience are critical.
FAQ
What is the function of the VCAP pin, and what capacitor value is recommended?
The VCAP pin supplies temporary power to complete AutoStore during VCC dropout. A 47 µF to 100 µF tantalum or polymer capacitor is recommended for reliable operation across the 2.7–3.6 V range and industrial temperature. Capacitor ESR must be ≤1 Ω; connecting VCAP to ground violates absolute maximum ratings and may damage the device.
Can the RTC operate without an external crystal?
Yes - the RTC can run from its internal calibrated oscillator in crystal-bypass mode. In this configuration, the Xin/Xout pins are left unconnected, and the device delivers ±5 ppm accuracy at +25 °C with temperature compensation enabled. Crystal connection is optional and improves long-term stability to ±2 ppm.
How does Hardware STORE differ from Software STORE in terms of timing and reliability?
Hardware STORE initiates immediately on HSB pin fall, completing within 15 ms (max) and asserting HSB LOW until done. Software STORE requires SPI command issuance and takes up to 20 ms. Hardware STORE is preferred for fail-safe scenarios because it requires no MCU firmware execution and responds to power-loss edge conditions before VCC drops below operating threshold.
Is the CY14B256PA-SFXIT pin-compatible with CY14C256PA or CY14E256PA?
Yes - all three variants (CY14C/CY14B/CY14E) share identical 16-pin SOIC pinout, SPI command set, and register map. Voltage range differs (2.4–2.6 V / 2.7–3.6 V / 4.5–5.5 V), so direct substitution requires verification of supply rail compatibility and derating of VCC-related parameters like active current and tSU.
CY14B256PA-SFXIT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 16-SOIC (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:
- SPI
- Clock Frequency:
- 40 MHz
- Write Cycle Time - Word, Page:
- -
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
CY14B256PA-SFXIT FAQ
1.How can I place an order for CY14B256PA-SFXIT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY14B256PA-SFXIT 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 CY14B256PA-SFXIT reliable?
The price and inventory of CY14B256PA-SFXIT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY14B256PA-SFXIT is usually 5 days.
3.What payment methods are accepted for CY14B256PA-SFXIT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY14B256PA-SFXIT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY14B256PA-SFXIT?
CY14B256PA-SFXIT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY14B256PA-SFXIT 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 CY14B256PA-SFXIT?
For technical support, including CY14B256PA-SFXIT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY14B256PA-SFXIT requirements.
6.How does Aetrix verify that CY14B256PA-SFXIT is sourced from the original manufacturer or authorized distributors?
All CY14B256PA-SFXIT 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 CY14B256PA-SFXIT meets industry standards.
7.What is the process for return or replacement of CY14B256PA-SFXIT?
All CY14B256PA-SFXIT units undergo pre-shipment inspection (PSI). If there is an issue with CY14B256PA-SFXIT, 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 CY14B256PA-SFXIT part is unused and in its original packaging.
Return procedure for CY14B256PA-SFXIT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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