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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Infineon Technologies CY15B256Q-SXAT

Name: CY15B256Q-SXAT
Brand: Infineon Technologies
SKU: CY15B256Q-SXAT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CY15B256Q-SXAT

Manufacturer:: Infineon Technologies

Category:: Memory

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: CY15B256Q-SXAT.pdf

Description:: IC FRAM 256KBIT SPI 40MHZ 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:2,176

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Product details

Overview

CY15B256Q-SXAT from Infineon Technologies is a 256 Kbit serial FRAM (Ferroelectric RAM) IC with SPI interface, 40 MHz max clock frequency, 8-pin SOIC package, and 1.8 V to 3.6 V supply voltage. It serves as non-volatile memory in real-time data logging systems requiring fast write endurance and low-power operation.

For engineers reviewing the CY15B256Q-SXAT datasheet, CY15B256Q-SXAT pinout, CY15B256Q-SXAT application, or CY15B256Q-SXAT equivalent, key selection criteria include write cycle endurance (>10¹⁴ cycles), zero write latency, SPI mode 0/3 compatibility, and industrial temperature range (–40°C to +85°C).

Technical Context

This FRAM integrates a ferroelectric capacitor-based memory array with a standard SPI serial interface controller. It supports full-duplex read/write operations, automatic address incrementing, and hardware write protection via WP# pin.

The device uses no internal charge pump for write operations, eliminating write delay and enabling byte-level writes at bus speed. Its memory cell retains data without power for over 10 years at +85°C and withstands >10¹⁴ read/write cycles-exceeding EEPROM and Flash by orders of magnitude.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Type	Ferroelectric RAM (FRAM) - enables true random-access non-volatility with no write delay or wear leveling.
Capacity	256 Kbit (32 K × 8) - supports up to 32,768 bytes of byte-addressable persistent storage.
Interface	4-wire SPI (CLK, SI, SO, CS#) - compatible with standard microcontroller SPI peripherals without protocol translation.
Max Clock Frequency	40 MHz - allows sustained 40 MB/s serial throughput for high-speed data capture.
Supply Voltage	1.8 V to 3.6 V - interoperable with both 1.8 V logic domains and 3.3 V industrial MCU I/O rails.
Data Retention	10 years at +85°C - ensures long-term reliability in thermally stressed embedded environments.
Write Endurance	10¹⁴ cycles per byte - eliminates lifetime concerns in high-frequency logging (e.g., sensor sampling every 10 ms).

Pinout & Package

8-pin Small Outline Integrated Circuit (SOIC) package, 150 mil width, surface-mount, RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
CS#	Chip Select Input	Active-low enable for SPI communication; must be asserted before CLK edge to initiate transaction.
SO	Serial Output	Tri-state output carrying read data or status bits; driven only when CS# is low and read command active.
WP#	Write Protect Input	Hardware lock for upper half of memory (16K–31K); prevents accidental overwrite during power transitions.
V_CC	Power Supply	Primary supply rail (1.8–3.6 V); decoupling capacitor required within 10 mm of pin for noise immunity.
GND	Ground	Reference return path for all digital and memory array circuits; shared with system ground plane.
SI	Serial Input	Accepts command opcodes, addresses, and write data on rising CLK edges; latched synchronously.
SCK	Serial Clock	Master-generated clock driving all SPI timing; supports continuous 40 MHz operation with 50% duty cycle.
HOLD#	Pause Control Input	Halts ongoing SPI transfer without deselecting device; useful for multi-master arbitration or interrupt handling.

Key Features

Feature	Design Value
Zero Write Latency	Writes complete in same SPI clock cycle as last data bit - no wait states or polling required for completion.
Unlimited Write Endurance	10¹⁴ write cycles per memory location - supports continuous logging at 1 kHz for >3,000 years without degradation.
Low-Voltage Operation	Full functionality down to 1.8 V - enables direct interfacing with ultra-low-power MCUs (e.g., ARM Cortex-M0+ in sleep mode).
Hardware Write Protection	Independent WP# and software-locked sectors - prevents corruption during brown-out or firmware crash.
Industrial Temperature Range	–40°C to +85°C operation - qualified for deployment in automotive ECUs, industrial PLCs, and outdoor metering equipment.

Applications

Smart Energy Metering

Automotive Telematics

Use Scenario: Storing tariff schedules, consumption history, and tamper-event timestamps in electricity meters with 10-year field life.

IC Role / Device Role / Timing Role: Non-volatile scratchpad memory capturing time-stamped kWh readings every second without wear-out risk.

Use Value: Eliminates need for external EEPROM backup and avoids data loss during mains dropout due to instant-write capability.

Use Scenario: Logging GPS position, accelerometer data, and CAN bus diagnostics in vehicle black-box recorders.

IC Role / Device Role / Timing Role: High-cycle buffer storing crash-triggered pre-event data at 100 Hz sampling rate.

Use Value: Guarantees capture of 5 seconds of pre-crash data even during sudden power loss, with no write delay penalty.

Industrial PLC I/O Modules

Medical Patient Monitor Logs

Use Scenario: Recording sensor calibration coefficients, fault logs, and configuration parameters across 20+ years of factory automation use.

IC Role / Device Role / Timing Role: Configuration store retaining settings across firmware updates and power cycles.

Use Value: Removes requirement for periodic refresh routines or wear-leveling firmware overhead in deterministic control loops.

Use Scenario: Capturing ECG waveforms, alarm events, and operator actions in portable patient monitors operating on battery for 8+ hours.

IC Role / Device Role / Timing Role: Low-power non-volatile buffer enabling continuous waveform snapshot on critical event detection.

Use Value: Achieves sub-millisecond data persistence without increasing system standby current beyond 2 µA.

Equivalent & Alternatives

The following parts are listed as comparable options for similar non-volatile serial memory applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
CY15B104Q-SXAT	128 Kbit density, identical SOIC-8 footprint and SPI timing - half capacity, same endurance and voltage range.	Suitable where firmware size or log depth fits within 16 KB; reduces BOM cost by ~18% at volume.	Select when memory budget permits reduction without compromising timestamp resolution or retention duration.
FM25V05-G	512 Kbit FRAM, 3.0–3.6 V only, SOIC-8, 40 MHz - higher capacity but narrower V_CC range and no 1.8 V support.	Preferred in 3.3 V-only designs needing extended log buffers; not viable for dual-voltage or battery-backed systems.	Choose only if system operates strictly at 3.3 V and requires >32 KB persistent storage without voltage translation.

Compared with CY15B104Q-SXAT, the CY15B256Q-SXAT doubles capacity while maintaining identical timing, endurance, and low-voltage operation; versus FM25V05-G, it trades capacity for broader voltage flexibility and direct 1.8 V MCU compatibility.

Availability

CY15B256Q-SXAT is available at Aetrix Electronics and suitable for smart metering, automotive black-box recorders, industrial PLC modules, and portable medical devices requiring stable component supply and guaranteed long-term availability.

Supply support for CY15B256Q-SXAT 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 German semiconductor manufacturer specializing in power management, automotive ICs, and memory solutions, with global R&D and manufacturing infrastructure.

The CY15B series targets high-reliability embedded systems demanding byte-level non-volatility, extreme write endurance, and deterministic timing-designed specifically for data-logging, event-recording, and configuration storage in harsh environments.

FAQ

What is the maximum SPI clock frequency supported by CY15B256Q-SXAT?

The CY15B256Q-SXAT supports up to 40 MHz SPI clock frequency across its full industrial temperature range (–40°C to +85°C). This enables sustained 40 MB/s serial throughput for high-speed data capture without timing margin violations, provided setup/hold times are met per the datasheet's AC characteristics table.

Does CY15B256Q-SXAT require a write-enable command before each write operation?

No. Unlike EEPROM or Flash, the CY15B256Q-SXAT performs writes instantly upon receiving data on the SI line during a WRITE instruction-no separate WREN command or status polling is needed. The device completes each byte write within the same SPI frame, eliminating software overhead and latency uncertainty.

Can CY15B256Q-SXAT operate reliably at 1.8 V supply voltage?

Yes. The CY15B256Q-SXAT is fully specified for operation from 1.8 V to 3.6 V, including all AC timing parameters, write endurance, and data retention. At 1.8 V, it maintains 40 MHz SPI capability and retains full 10¹⁴ write-cycle endurance, making it suitable for battery-powered and ultra-low-power MCU interfaces.

How does the HOLD# pin function during an active SPI transaction?

The HOLD# pin pauses an ongoing SPI transfer immediately after the current byte is latched-without deselecting the device or resetting internal state. When deasserted, communication resumes from the exact next bit position. This enables seamless interruption for higher-priority tasks (e.g., interrupt service) without losing transaction context or requiring re-initialization.

CY15B256Q-SXAT Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: F-RAM™

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

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-SXAT FAQ

1.How can I place an order for CY15B256Q-SXAT through Aetrix?

Please submit a Request for Quotation (RFQ) for CY15B256Q-SXAT 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-SXAT reliable?

The price and inventory of CY15B256Q-SXAT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY15B256Q-SXAT is usually 5 days.

3.What payment methods are accepted for CY15B256Q-SXAT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY15B256Q-SXAT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CY15B256Q-SXAT?

CY15B256Q-SXAT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CY15B256Q-SXAT 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-SXAT?

For technical support, including CY15B256Q-SXAT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY15B256Q-SXAT requirements.

6.How does Aetrix verify that CY15B256Q-SXAT is sourced from the original manufacturer or authorized distributors?

All CY15B256Q-SXAT 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-SXAT meets industry standards.

7.What is the process for return or replacement of CY15B256Q-SXAT?

All CY15B256Q-SXAT units undergo pre-shipment inspection (PSI). If there is an issue with CY15B256Q-SXAT, 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-SXAT part is unused and in its original packaging.

Return procedure for CY15B256Q-SXAT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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