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Infineon Technologies CY14B256K-SP45XI
- Part No.:
- CY14B256K-SP45XI
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
CY14B256K-SP45XI.pdf
- Description:
- IC NVSRAM 256KBIT PAR 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,597
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Product details
Overview
CY14B256K-SP45XI from Cypress Semiconductor is a 256 Kbit (32K × 8) nonvolatile SRAM with integrated real-time clock, pin-compatible with STK17T88, featuring 45 ns access time, 350 nA RTC standby current, and QuantumTrap™ nonvolatile storage. It operates from a single 3V supply (2.7–3.6 V), supports hardware/software STORE/RECALL, and delivers 20-year data retention at 55°C - deployed in industrial metering, medical data loggers, and PLCs requiring power-loss resilience.
For engineers reviewing the CY14B256K-SP45XI datasheet, CY14B256K-SP45XI pinout, CY14B256K-SP45XI application, or CY14B256K-SP45XI equivalent, key selection criteria include AutoStore® capacitor sizing (VCAP), RTC backup source selection (VCAP vs. VRTCbat), HSB-driven store timing, and software STORE/RECALL address sequence validation.
Technical Context
The CY14B256K-SP45XI integrates a standard fast SRAM array (512 × 512) with parallel-coupled QuantumTrap™ nonvolatile elements, enabling simultaneous STORE/RECALL across all 32K bytes. Its RTC includes leap-year tracking, programmable oscillator calibration, and alarm/wdog interrupt generation via INT pin.
STORE operations are triggered by hardware (HSB pin), software (6-address CE-controlled READ sequence), or automatic power-down detection using VCAP charge pump. RECALL occurs on power-up or via software sequence. All SRAM reads/writes are infinite-cycle; nonvolatile STORE endurance is rated at 200K cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 Kbit (32,768 × 8-bit), directly replaceable for legacy 32K × 8 SRAM designs without bus rework. |
| Access Time | 45 ns max - defines minimum cycle time for reliable CE/OE-controlled read/write in high-speed control loops. |
| RTC Supply Current | 350 nA typical - enables >10-year battery life with CR2032 when VRTCbat is used; eliminates RTC battery replacement in sealed devices. |
| Data Retention | 20 years at 55°C - ensures long-term firmware/state persistence in industrial environments without refresh or backup power. |
| Nonvolatile Endurance | 200,000 STORE cycles - constrains maximum store frequency to ≤1×/hour in continuous logging applications. |
| VCC Range | 2.7 V to 3.6 V - compatible with 3.3 V systems including FPGA I/O banks and microcontrollers with ±10% tolerance margins. |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade operation in motor drives, energy meters, and factory automation controllers. |
Pinout & Package
Package: 48-pin SSOP (0.300" wide), RoHS-compliant, JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus for full 32K-byte addressing; no multiplexing required. |
| DQ0–DQ7 | Bidirectional Data Bus | 8-bit parallel interface shared for read/write/store/recall; tri-stated when OE HIGH or during STORE/RECALL. |
| WE, CE, OE | Control Inputs | Standard SRAM control logic (active-low); CE/WE/OE timing governs read/write mode per Table 1. |
| HSB | Hardware Store Busy | Open-drain status output (LOW = STORE in progress); also accepts external LOW pulse to initiate hardware STORE. |
| VCAP | AutoStore Capacitor | Connects to external 10–100 µF tantalum/ceramic cap; internal charge pump raises voltage to ~5 V for STORE energy. |
| VRTCcap / VRTCbat | RTC Backup Supply | Exclusive selection: VRTCcap for capacitor-backed RTC; VRTCbat for coin-cell battery; only one connected. |
| INT | Interrupt Output | Programmable active-HIGH push-pull or active-LOW open-drain; asserts on RTC alarm, watchdog timeout, or power monitor event. |
| X1/X2 | 32.768 kHz Crystal Interface | Drives external tuning-fork crystal; X1 is buffered output, X2 is input; enables ±20 ppm RTC accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| AutoStore® on Power Loss | Zero-software intervention store: VCAP discharge triggers full-array STORE when VCC drops below VSWITCH (~2.5 V). |
| Software STORE/RECALL | 6-address CE-controlled READ sequence (e.g., 0x0E38 → 0x0FC0) initiates nonvolatile transfer without external hardware. |
| RTC with Alarm & WDT | Configurable periodic/one-shot alarms (sec/min/hr/day) and watchdog timer with programmable timeout for system recovery. |
| QuantumTrap™ Nonvolatility | Monolithic integration eliminates discrete EEPROM/NVRAM + SRAM combo; eliminates inter-chip timing skew and layout complexity. |
| Power-Safe Write Protection | Automatic inhibition of WRITE/STORE when VCC < VSWITCH prevents corruption during brown-out or power ramp. |
Applications
| Smart Energy Metering | Industrial PLC Data Logging |
|---|---|
|
Use Scenario: Captures cumulative kWh, tariff schedules, and tamper events during mains power interruption. IC Role / Device Role / Timing Role: nvSRAM stores metering registers; RTC maintains accurate billing timestamps and calendar-based rate switching. Use Value: Guarantees zero data loss across 100+ power cycles/year; eliminates need for supercapacitor + separate RTC IC. |
Use Scenario: Logs sensor inputs (temperature, pressure, vibration) and controller state during factory line shutdowns. IC Role / Device Role / Timing Role: Acts as deterministic nonvolatile buffer; RTC timestamps each log entry with millisecond precision. Use Value: Enables traceability of process deviations; supports ISO 13849 compliance with auditable timestamped logs. |
| Medical Diagnostic Equipment | Automotive Telematics Control Unit |
|
Use Scenario: Preserves patient session data, calibration coefficients, and error history between device power cycles. IC Role / Device Role / Timing Role: Stores critical diagnostic parameters; RTC tracks service intervals and firmware update windows. Use Value: Meets IEC 62304 Class C software requirements for persistent state integrity and deterministic recall timing. |
Use Scenario: Records GPS position, CAN bus fault codes, and driver behavior metrics during vehicle ignition-off periods. IC Role / Device Role / Timing Role: Provides power-fail-safe storage for black-box telemetry; RTC synchronizes multi-sensor timestamps. Use Value: Supports UNECE R156 compliance with tamper-proof, time-stamped crash/event data retention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nvSRAM with RTC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STK17T88-35I | 35 ns access time; no AutoStore® - requires external capacitor charging circuit and manual STORE trigger. | Lacks integrated power-loss detection; RTC lacks alarm/wdog; lower data retention (10 years @ 55°C). | Choose only if legacy board compatibility is mandatory and design can accommodate external STORE control logic. |
| FM31L278-G | Integrated lithium battery management; 256 Kbit FRAM (not nvSRAM); 55 ns access; no HSB pin. | FRAM offers unlimited endurance but higher write latency; RTC lacks programmable alarm granularity (only daily). | Select when infinite STORE cycles are essential and system can tolerate 10–15 µs write latency over 45 ns SRAM speed. |
Compared with STK17T88-35I and FM31L278-G, CY14B256K-SP45XI uniquely combines 45 ns SRAM speed, autonomous AutoStore®, and full RTC feature set in one monolithic die - reducing BOM count, PCB area, and qualification effort for safety-critical logging.
Availability
CY14B256K-SP45XI is available at Aetrix Electronics and suitable for industrial metering, medical diagnostics, automotive telematics, and factory automation requiring stable component supply and long-life data retention.
Supply support for CY14B256K-SP45XI 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 mixed-signal ICs for industrial, automotive, and IoT applications, with expertise in nonvolatile memory and timing solutions.
The CY14B series targets mission-critical data logging systems where SRAM speed must coexist with guaranteed nonvolatile storage - eliminating external backup components while meeting 20-year field reliability targets.
FAQ
What capacitor value is required for reliable AutoStore® operation?
The CY14B256K-SP45XI requires a 10–100 µF low-ESR tantalum or ceramic capacitor on VCAP. A 47 µF/10 V capacitor is recommended for 45 ns operation with 2.7 V VCC minimum. Larger values increase inrush stress on the internal pass transistor and are not advised without Cypress consultation.
How does the HSB pin behave during a software-initiated STORE?
HSB goes LOW during any STORE operation - whether initiated by HSB pin assertion, software address sequence, or AutoStore® on power loss. The pin remains LOW for the full tSTORE duration (max 20 ms), then releases HIGH. It does not distinguish initiation method.
Can the RTC operate independently while SRAM is being written?
Yes. The RTC runs continuously from VRTCcap or VRTCbat regardless of SRAM activity. Its oscillator, calendar, alarm, and watchdog functions remain fully operational during SRAM READ/WRITE cycles, STORE, or RECALL - no arbitration or suspension occurs.
Is the software STORE sequence vulnerable to bus contention or noise?
Yes. The six-address READ sequence must execute without interruption - any intervening READ/WRITE to other addresses aborts the STORE. Use CE-controlled reads with stable address/data buses; avoid shared-bus arbitration during sequence execution. OE may be HIGH or LOW, but CE must be asserted for each access.
CY14B256K-SP45XI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 48-BSSOP (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:
- 2.7V ~ 3.45V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
CY14B256K-SP45XI FAQ
1.How can I place an order for CY14B256K-SP45XI through Aetrix?
Please submit a Request for Quotation (RFQ) for CY14B256K-SP45XI 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 CY14B256K-SP45XI reliable?
The price and inventory of CY14B256K-SP45XI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY14B256K-SP45XI is usually 5 days.
3.What payment methods are accepted for CY14B256K-SP45XI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY14B256K-SP45XI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY14B256K-SP45XI?
CY14B256K-SP45XI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY14B256K-SP45XI 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 CY14B256K-SP45XI?
For technical support, including CY14B256K-SP45XI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY14B256K-SP45XI requirements.
6.How does Aetrix verify that CY14B256K-SP45XI is sourced from the original manufacturer or authorized distributors?
All CY14B256K-SP45XI 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 CY14B256K-SP45XI meets industry standards.
7.What is the process for return or replacement of CY14B256K-SP45XI?
All CY14B256K-SP45XI units undergo pre-shipment inspection (PSI). If there is an issue with CY14B256K-SP45XI, 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 CY14B256K-SP45XI part is unused and in its original packaging.
Return procedure for CY14B256K-SP45XI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CY14B256K-SP45XI Tags
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