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Infineon Technologies CY15B256Q-SXA
- Part No.:
- CY15B256Q-SXA
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CY15B256Q-SXA.pdf
- Description:
- IC FRAM 256KBIT SPI 40MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,859
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Product details
Overview
CY15B256Q-SXA from Infineon Technologies (formerly Cypress) is a 256-Kbit (32K × 8) automotive-grade serial SPI F-RAM with ferroelectric nonvolatile memory technology, operating from 2.0 V to 3.6 V over –40 °C to +85 °C, delivering NoDelay™ writes at up to 40 MHz, 10¹⁴ read/write endurance, and 151-year data retention - deployed in vehicle event loggers and ADAS sensor configuration storage.
For engineers reviewing the CY15B256Q-SXA datasheet, CY15B256Q-SXA pinout, CY15B256Q-SXA application, or CY15B256Q-SXA equivalent, key selection criteria include SPI mode 0/3 compatibility, hardware/software write protection granularity (1/4, 1/2, full array), low sleep current (8 µA), and drop-in replacement capability for serial EEPROM or flash in safety-critical automotive subsystems.
Technical Context
The CY15B256Q-SXA implements a synchronous SPI slave interface with zero-latency write execution: data commits immediately upon byte transfer completion without polling or internal write cycles. Its ferroelectric memory array eliminates charge-pump-based programming delays inherent in flash and EEPROM.
It integrates a 3-bit nonvolatile status register controlling block protection, write enable latch, and WPEN bit; supports dual SPI modes (0 and 3) with rising-edge input sampling and falling-edge output driving; and uses dedicated SI/SO pins (or shared single-pin mode) with weak internal pull-up on HOLD.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 Kbit (32K × 8) - supports full byte-addressable access across 32,768 locations without page boundaries or erase overhead. |
| Interface Speed | Up to 40 MHz SPI clock - enables 4 MB/s peak throughput, matching high-speed microcontroller SPI peripherals. |
| Write Endurance | 10¹⁴ read/write cycles - sustains >27,000 writes/sec continuously for 10+ years in data-logging applications. |
| Data Retention | 151 years at +85 °C - guarantees nonvolatile storage integrity over full automotive lifetime without refresh. |
| Supply Voltage | 2.0 V to 3.6 V - compatible with 2.5 V and 3.3 V automotive domain controllers and power domains. |
| Operating Temp | –40 °C to +85 °C (Automotive Grade A) - qualified per AEC-Q100 for engine bay and cabin control modules. |
| Power Modes | 8 µA sleep / 150 µA standby / 2.5 mA active @40 MHz - enables ultra-low-power wake-on-event logging in always-on ECUs. |
Pinout & Package
8-pin Small Outline Integrated Circuit (SOIC) package, surface-mount, RoHS-compliant, 150 mil body width.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCK | Input | Serial clock input synchronized to SPI master; rising edge latches SI, falling edge drives SO; supports 0–40 MHz with interruptible clock. |
| CS | Input | Active-low chip select; device enters standby and tristates SO when HIGH; falling edge initiates opcode sequence. |
| SI | Input | Serial data input (MOSI); receives opcodes, addresses, and write data; must be driven to valid logic level for IDD compliance. |
| SO | Output | Serial data output (MISO); returns read data and status bits; tristated during HOLD or CS HIGH. |
| WP | Input | Hardware write protect; prevents Status Register modification when WPEN = 1 and WP = LOW; tied to VDD if unused. |
| HOLD | Input | Operation suspend control; halts ongoing read/write when LOW while SCK is LOW; features weak internal pull-up. |
| VSS | Power | Ground reference; must connect to system ground plane for noise immunity and ESD path integrity. |
| VDD | Power | Core supply input; powers internal logic and F-RAM array; requires local 100 nF decoupling per datasheet layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| NoDelay™ Write Architecture | Eliminates write latency and polling - each byte commits instantly upon SPI frame completion, enabling deterministic real-time logging. |
| Ferroelectric Memory Core | Enables 100 trillion write cycles and 151-year data retention without wear leveling or background erase management. |
| Dual SPI Mode Support | Operates in Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1), ensuring interoperability with diverse MCU SPI peripherals. |
| Granular Write Protection | Software-configurable block lock (1/4, 1/2, or full array) plus hardware WP pin control - secures critical calibration or firmware parameters. |
| Device ID Readback | Manufacturer ID (0x01) and Product ID (0x59) accessible via RDID command - enables automated BOM validation and field firmware verification. |
Applications
| Telematics Event Logger | ADAS Sensor Configuration Storage |
|---|---|
Use Scenario: Continuous recording of GPS position, speed, acceleration, and CAN bus fault codes during vehicle operation, with power-loss resilience. IC Role / Device Role / Timing Role: Nonvolatile scratchpad memory interfacing directly to MCU SPI port; stores timestamped entries without write delay or data loss on sudden shutdown. Use Value: 10¹⁴ endurance supports >100 million ignition cycles; 8 µA sleep current extends battery backup runtime in disconnected state. | Use Scenario: Storing calibrated offset/gain values and runtime configuration for radar or camera modules after factory setup and field updates. IC Role / Device Role / Timing Role: SPI-configurable parameter store accessed at boot and during dynamic recalibration; protected via WP pin and status register lock. Use Value: 151-year retention ensures calibration persistence across vehicle lifetime; 40 MHz interface enables sub-millisecond reconfiguration. |
| Body Control Module (BCM) Settings | Infotainment System Preferences |
Use Scenario: Persisting user-selectable lighting profiles, door lock behavior, and mirror positioning across ignition cycles and battery disconnects. IC Role / Device Role / Timing Role: Automotive-grade serial NV memory replacing EEPROM; accessed via same MCU SPI peripheral used for CAN transceiver config. Use Value: Hardware write protection prevents accidental overwrite during firmware updates; 2.0–3.6 V range matches BCM power rail. | Use Scenario: Saving audio equalizer presets, display brightness levels, and Bluetooth pairing history across reboots and software upgrades. IC Role / Device Role / Timing Role: High-reliability configuration store co-located with SoC; supports fast random-access reads and frequent small writes. Use Value: NoDelay™ writes prevent UI lag during preference changes; AEC-Q100 qualification ensures reliability in thermally stressed dash environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial nonvolatile memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25DF041A-SSH-T | 4-Mbit SPI flash with 100k write cycles, 20 ms page program time, no built-in write protection bits | Requires external wear leveling and polling; unsuitable for high-frequency logging | Select only when cost-per-bit dominates and write frequency is <100×/hour |
| BR25H256FJ-WE2 | 256-Kbit SPI EEPROM with 1M write cycles, 5 ms write time, software-only protection | Lacks hardware WP pin and fails to meet 151-year retention at 85 °C | Acceptable for non-automotive industrial use where temperature stress is <70 °C |
Compared with AT25DF041A-SSH-T and BR25H256FJ-WE2, the CY15B256Q-SXA uniquely delivers simultaneous high endurance, zero-write-delay, and automotive temperature assurance - making it the sole choice for safety-critical, high-write-rate automotive memory nodes.
Availability
CY15B256Q-SXA is available at Aetrix Electronics and suitable for telematics event loggers, ADAS sensor configuration storage, and body control module settings requiring stable component supply across extended automotive production lifecycles.
Supply support for CY15B256Q-SXA 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 systems, sensors, and automotive ICs with strong emphasis on functional safety and reliability.
The CY15B256Q-SXA belongs to Infineon's automotive F-RAM product line, engineered specifically to replace legacy serial EEPROM and flash in safety-critical, high-endurance automotive subsystems where deterministic write timing and long-term data integrity are mandatory.
FAQ
Is CY15B256Q-SXA pin-compatible with standard 8-pin SOIC SPI EEPROMs?
Yes - CY15B256Q-SXA uses identical 8-pin SOIC footprint and pin assignments (SCK, CS, SI, SO, WP, HOLD, VSS, VDD) as industry-standard serial EEPROMs and flash devices, enabling direct PCB-level replacement without layout changes.
Does CY15B256Q-SXA require special initialization or firmware drivers?
No - it operates using standard SPI opcodes (WREN, WRITE, READ, RDSR, WRSR) and responds identically to legacy SPI memories at protocol level; existing EEPROM drivers work with minor timing adjustments due to absence of write delays.
How does the HOLD pin behave during an active write operation?
When HOLD is pulled LOW during a write, the device suspends the current transaction immediately, retains internal address and state, and ignores further SCK/CS transitions until HOLD returns HIGH - allowing safe CPU context switching without data corruption or retry logic.
What is the significance of the "SXA" suffix in CY15B256Q-SXA?
The "SXA" denotes Infineon's automotive-grade packaging variant: 8-pin SOIC with extended temperature qualification (–40 °C to +85 °C), Pb-free/RoHS-compliant finish, and AEC-Q100 Grade 2 reliability testing - distinct from commercial "SX" or industrial "SXI" variants.
CY15B256Q-SXA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- F-RAM™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FRAM
- Technology:
- FRAM (Ferroelectric RAM)
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 40 MHz
- Write Cycle Time - Word, Page:
- -
- Access Time:
- -
- Voltage - Supply:
- 2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CY15B256Q-SXA FAQ
1.How can I place an order for CY15B256Q-SXA through Aetrix?
Please submit a Request for Quotation (RFQ) for CY15B256Q-SXA 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 CY15B256Q-SXA reliable?
The price and inventory of CY15B256Q-SXA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY15B256Q-SXA is usually 5 days.
3.What payment methods are accepted for CY15B256Q-SXA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY15B256Q-SXA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY15B256Q-SXA?
CY15B256Q-SXA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY15B256Q-SXA 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 CY15B256Q-SXA?
For technical support, including CY15B256Q-SXA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY15B256Q-SXA requirements.
6.How does Aetrix verify that CY15B256Q-SXA is sourced from the original manufacturer or authorized distributors?
All CY15B256Q-SXA 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 CY15B256Q-SXA meets industry standards.
7.What is the process for return or replacement of CY15B256Q-SXA?
All CY15B256Q-SXA units undergo pre-shipment inspection (PSI). If there is an issue with CY15B256Q-SXA, 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 CY15B256Q-SXA part is unused and in its original packaging.
Return procedure for CY15B256Q-SXA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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