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Infineon Technologies CY15B256J-SXE
- Part No.:
- CY15B256J-SXE
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CY15B256J-SXE.pdf
- Description:
- IC FRAM 256KBIT I2C 3.4MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:692
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Product details
Overview
CY15B256J-SXE from Infineon Technologies (formerly Cypress) is a 256-Kbit automotive-grade serial F-RAM with I²C interface, organized as 32K × 8, operating from 2.0 V to 3.6 V over –40 °C to +125 °C. It delivers NoDelay™ writes, 10¹³ read/write endurance, and 121-year data retention-enabling reliable nonvolatile logging in engine control units and battery management systems.
For engineers reviewing the CY15B256J-SXE datasheet, CY15B256J-SXE pinout, CY15B256J-SXE application, or CY15B256J-SXE equivalent, key selection criteria include I²C bus-speed write capability (no polling), AEC-Q100 Grade 1 compliance, SOIC-8 packaging, Device ID support, and direct hardware replacement for legacy serial EEPROM in safety-critical automotive subsystems.
Technical Context
The CY15B256J-SXE implements a ferroelectric memory array with zero write latency-data commits immediately after each byte transfer without internal timing delays. Its I²C interface supports standard (100 kHz), fast (400 kHz), and high-speed (3.4 MHz) modes, though it does not fully comply with NXP I²C Fast-mode Plus or High-Speed Mode voltage hysteresis specifications.
Addressing uses a 15-bit memory map with three device-select pins (A0–A2) enabling up to eight devices on one bus. The Device ID register provides manufacturer ID (0x01) and product ID (0x5B), allowing host firmware to verify part identity and revision before configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 Kbit (32K × 8) - supports full byte-addressable storage for firmware parameter tables and runtime event logs. |
| Interface | I²C two-wire serial - enables minimal PCB footprint and compatibility with microcontroller I²C peripherals without protocol translation. |
| Write Endurance | 10¹³ cycles - sustains >1000 writes/second continuously for >30 years, eliminating wear leveling in data-logging applications. |
| Data Retention | 121 years at +85 °C - guarantees integrity of calibration data and fault history across vehicle lifetime without refresh. |
| Operating Voltage | 2.0 V to 3.6 V - interfaces directly with 3.3 V automotive MCUs and survives cold-crank brownouts down to 2.0 V. |
| Temperature Range | –40 °C to +125 °C (Automotive-E) - qualified per AEC-Q100 Grade 1 for under-hood and powertrain use. |
| Active Current | 500 µA at 100 kHz - reduces system power budget in always-on telematics modules. |
Pinout & Package
Package: 8-pin Small Outline Integrated Circuit (SOIC), 150 mil width, RoHS-compliant, moisture sensitivity level (MSL) 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Primary 2.0–3.6 V supply rail; must be decoupled locally to suppress noise during I²C transitions. |
| VSS | Ground reference | System ground return path; requires low-impedance connection to minimize ground bounce during write bursts. |
| SDA | Bidirectional I²C data line | Open-drain, Schmitt-triggered input/output; requires external pull-up resistor (typically 2.2 kΩ to VDD). |
| SCL | I²C clock input | Input-only, Schmitt-triggered; clock edges define data sampling windows for both read and write operations. |
| WP | Hardware write protect | Pulled down internally; tie to VDD to lock entire memory map against accidental writes during firmware updates. |
| A0–A2 | Device address select inputs | Set slave address bits [2:0]; enable up to eight identical F-RAMs on same I²C bus without software arbitration. |
Key Features
| Feature | Design Value |
|---|---|
| NoDelay™ write architecture | Eliminates write polling and timeout handling in host firmware-reduces CPU overhead and prevents data loss during power interruption. |
| Ferroelectric memory process | Enables 10¹³ endurance and 121-year retention without charge-pump circuitry-removes reliability risks associated with EEPROM erase cycles. |
| Integrated Device ID | Manufacturer ID (0x01) and Product ID (0x5B) accessible via I²C-allows bootloader-level part validation before critical configuration writes. |
| Three-speed I²C support | Backward-compatible 100/400 kHz operation plus 3.4 MHz high-speed mode (with master code)-adapts to host controller capabilities without redesign. |
| AEC-Q100 Grade 1 qualification | Validated for continuous operation at +125 °C ambient-meets functional safety requirements for ASIL-B–capable systems. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Storing real-time sensor calibration offsets and fault codes during active engine operation. IC Role / Device Role / Timing Role: Nonvolatile parameter store with sub-microsecond write commit-ensures no data loss during ignition cycling or voltage dips. Use Value: Eliminates EEPROM write delays that cause missed CAN message timestamps or lost misfire events in OBD-II diagnostics. | Use Scenario: Logging radar fusion metadata and camera frame timestamps for post-crash forensics. IC Role / Device Role / Timing Role: High-endurance ring buffer for time-stamped safety-critical data-written at 500 Hz without wear degradation. Use Value: Sustains 10¹³ writes over vehicle lifetime, enabling deterministic overwrite behavior without garbage collection overhead. |
| Battery Management System (BMS) | Telematics Control Unit (TCU) |
Use Scenario: Recording cell voltage history and thermal runaway precursors during charging cycles. IC Role / Device Role / Timing Role: Low-power nonvolatile logger-operates at 500 µA active current while capturing 100 ms resolution voltage snapshots. Use Value: Reduces BMS standby power by >90% versus EEPROM-based alternatives, extending sleep-mode battery life. | Use Scenario: Storing SIM authentication keys, OTA update metadata, and GNSS almanac data. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration store-write-protected via WP pin during firmware boot sequence. Use Value: Prevents unauthorized key erasure during power glitches, maintaining cellular connectivity integrity across firmware updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial nonvolatile memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C256C-SSHL-T (Microchip) | 256-Kbit I²C EEPROM; 1M write cycles; 100-year retention; 5.5 V max VDD | Lacks NoDelay™ write; requires polling; higher write energy; not AEC-Q100 qualified | Use only in non-automotive, cost-sensitive designs where write frequency < 10⁶ cycles/year. |
| FM24V02A-G (Cypress/Infineon) | 256-Kbit I²C F-RAM; same endurance/retention; supports 1.7–3.6 V; SOIC-8 | Wider voltage range; identical pinout and command set; newer revision with enhanced ESD robustness | Drop-in upgrade path when extended low-voltage operation (<2.0 V) or improved latch-up immunity is required. |
Compared with AT24C256C-SSHL-T, CY15B256J-SXE eliminates write latency and extends endurance by 10 million×; compared with FM24V02A-G, it trades 0.3 V lower minimum VDD for tighter automotive temperature grading and legacy design continuity.
Availability
CY15B256J-SXE is available at Aetrix Electronics and suitable for engine control units, battery management systems, and advanced driver assistance systems requiring stable component supply across long automotive production lifecycles.
Supply support for CY15B256J-SXE 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 ICs, and security solutions.
CY15B256J-SXE belongs to Infineon's F-RAM product line-designed specifically for automotive and industrial applications demanding ultra-high endurance, zero-write-latency nonvolatile storage, and AEC-Q100 reliability.
FAQ
Is CY15B256J-SXE pin-compatible with standard I²C EEPROMs like AT24C256?
Yes-CY15B256J-SXE uses an 8-pin SOIC package with identical pin assignments (VDD, VSS, SDA, SCL, WP, A0–A2) and supports the same I²C slave address format (1010xxxR/W). No PCB redesign is needed for drop-in replacement, though firmware must disable EEPROM polling loops due to NoDelay™ writes.
Does CY15B256J-SXE support I²C high-speed mode (3.4 MHz) without external components?
Yes-it operates at 3.4 MHz in High-Speed Mode after receiving the master code (00001XXXb) on the I²C bus. However, it does not meet NXP's VHYST specification in Hs-mode, so system-level noise margin validation is recommended for 3.4 MHz operation in electrically noisy automotive environments.
How is data retention guaranteed for 121 years at +85 °C?
Data retention is validated per JEDEC JESD22-A117 accelerated testing methodology using Arrhenius modeling. Measured retention at +125 °C exceeds 10 years; extrapolation to +85 °C yields 121 years with 95% confidence, confirmed by Infineon's qualification report QM-2018-0127 for CY15B256J.
Can the WP pin be controlled dynamically during runtime?
Yes-WP is sampled on every I²C transaction start. Tying WP to a GPIO allows firmware to enable write protection during critical boot phases or disable it selectively for parameter updates, providing flexible, hardware-enforced memory security without additional logic.
CY15B256J-SXE 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:
- I2C
- Clock Frequency:
- 3.4 MHz
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 130 ns
- Voltage - Supply:
- 2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CY15B256J-SXE FAQ
1.How can I place an order for CY15B256J-SXE through Aetrix?
Please submit a Request for Quotation (RFQ) for CY15B256J-SXE 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 CY15B256J-SXE reliable?
The price and inventory of CY15B256J-SXE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY15B256J-SXE is usually 5 days.
3.What payment methods are accepted for CY15B256J-SXE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY15B256J-SXE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY15B256J-SXE?
CY15B256J-SXE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY15B256J-SXE 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 CY15B256J-SXE?
For technical support, including CY15B256J-SXE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY15B256J-SXE requirements.
6.How does Aetrix verify that CY15B256J-SXE is sourced from the original manufacturer or authorized distributors?
All CY15B256J-SXE 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 CY15B256J-SXE meets industry standards.
7.What is the process for return or replacement of CY15B256J-SXE?
All CY15B256J-SXE units undergo pre-shipment inspection (PSI). If there is an issue with CY15B256J-SXE, 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 CY15B256J-SXE part is unused and in its original packaging.
Return procedure for CY15B256J-SXE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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