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Infineon Technologies CY14B256K-SP45XC
- Part No.:
- CY14B256K-SP45XC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
CY14B256K-SP45XC.pdf
- Description:
- IC NVSRAM 256KBIT PAR 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,824
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Product details
Overview
CY14B256K-SP45XC from Cypress Semiconductor is a 256 Kbit (32K × 8) nonvolatile SRAM with integrated real-time clock, operating at 45 ns access time, 3.0–3.6 V supply, and supporting hardware/software STORE/RECALL via QuantumTrap™ technology. It delivers 20-year data retention at 55°C, 200K STORE endurance, and 350 nA RTC standby current - deployed in industrial control systems requiring deterministic power-loss data capture.
For engineers reviewing the CY14B256K-SP45XC datasheet, CY14B256K-SP45XC pinout, CY14B256K-SP45XC application, or CY14B256K-SP45XC equivalent, key selection criteria include AutoStore® capacitor sizing (VCAP), RTC backup source configuration (VCAP vs. VRTCbat), HSB-driven store timing, and software STORE address sequence integrity.
Technical Context
The device integrates a standard fast SRAM array (512 × 512) with parallel-coupled QuantumTrap™ nonvolatile elements, enabling simultaneous STORE/RECALL across all 32K bytes. Its RTC subsystem includes leap-year tracking, programmable oscillator calibration, and dual-interrupt sources: alarm and watchdog timer.
STORE operations are initiated by three independent mechanisms: automatic on VCC drop below VSWITCH (using charge-pumped VCAP), software-triggered via six-address CE-controlled READ sequence, or hardware-triggered via HSB pin assertion. RECALL occurs automatically on power-up or via software sequence, with tHRECALL ≤ 20 ms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 Kbit (32K × 8) - supports byte-wide interface without address multiplexing or external latch. |
| Access Time | 45 ns - guarantees full SRAM read/write timing compliance for 22 MHz bus systems. |
| RTC Current | 350 nA typical - enables >10-year battery life with CR2032 when using VRTCbat backup. |
| STORE Endurance | 200,000 cycles - defines maximum number of nonvolatile write operations before wear-out. |
| Data Retention | 20 years at 55°C - specifies guaranteed nonvolatile data hold time under worst-case thermal stress. |
| Supply Range | 3.0 V to 3.6 V - accommodates +20%/-10% tolerance; eliminates need for external LDO regulation. |
| Operating Temp | -40°C to +85°C - qualified for industrial temperature grade operation per JEDEC JESD22-A104. |
Pinout & Package
Package: 48-pin SSOP (ROHS compliant), 0.300-inch body width, 0.025-inch pitch.
| 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 I/O | 8-bit parallel data path; tri-stated when OE HIGH or during STORE/RECALL. |
| WE, CE, OE | Control Inputs | Standard SRAM control signals (active LOW); support CE- or OE-initiated reads/writes. |
| HSB | Hardware Store Busy | Open-drain status output indicating STORE progress; also accepts active-LOW store request. |
| VCAP | AutoStore Capacitor Supply | Charge-pump driven node (to 5 V) powering STORE operation during VCC collapse. |
| VRTCcap / VRTCbat | RTC Backup Source Select | Exclusive choice: capacitor-based (VRTCcap) or battery-based (VRTCbat) RTC power. |
| INT | Programmable Interrupt Output | Drives alarm or watchdog event; configurable as push-pull (active HIGH) or open-drain. |
| X1/X2 | 32.768 kHz Crystal Interface | Direct connection to tuning-fork crystal; internal oscillator circuitry provides RTC timing. |
Key Features
| Feature | Design Value |
|---|---|
| QuantumTrap™ Nonvolatility | Enables infinite SRAM READ/WRITE cycles while preserving STORE/RECALL integrity across 200K cycles. |
| AutoStore® on Power Loss | Guarantees single STORE execution using only external 10 µF–100 µF capacitor on VCAP - no battery needed. |
| RTC with Alarm & Watchdog | Supports periodic or one-shot alarms (sec/min/hr/day), plus independent watchdog timeout for system recovery. |
| Software STORE/RECALL | Initiated via exact 6-address CE-controlled READ sequence - immune to accidental triggering by random accesses. |
| Low-Voltage Write Protection | Inhibits WRITE and STORE when VCC < VSWITCH (typ. 2.7 V), preventing corruption during brown-out. |
Applications
| Industrial PLC Data Logger | Medical Infusion Pump Controller |
|---|---|
|
Use Scenario: Captures real-time dosage history and fault logs during mains power interruption. IC Role / Device Role / Timing Role: nvSRAM stores volatile operational data; RTC timestamps each log entry with leap-year accuracy. Use Value: Eliminates need for external EEPROM + RTC IC pair; ensures zero-data-loss logging even during sub-100 ms power dips. |
Use Scenario: Maintains therapy parameters and usage counters across repeated power cycles and battery swaps. IC Role / Device Role / Timing Role: Stores calibrated settings and runtime statistics; RTC tracks cumulative therapy duration. Use Value: Reduces BOM count by integrating memory + clock + power-loss protection into single 48-SSOP package. |
| Smart Grid Metering Terminal | Automotive Telematics Black Box |
|
Use Scenario: Records energy consumption snapshots and tamper events with precise UTC-aligned timestamps. IC Role / Device Role / Timing Role: Acts as secure, tamper-resistant data buffer; RTC synchronizes to GPS-derived time via software calibration. Use Value: Meets IEC 62053-21 requirements for meter data integrity and time stamping without external time source dependency. |
Use Scenario: Logs vehicle CAN bus diagnostics, ignition cycles, and crash-triggered event buffers. IC Role / Device Role / Timing Role: Provides nonvolatile storage for pre-crash data; RTC enables forensic timeline reconstruction. Use Value: Survives automotive battery disconnects and cold cranking voltage drops (<2.5 V) via VCAP-backed STORE. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nvSRAM with RTC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STK17T88-350I | 35 ns access, 256 Kbit nvSRAM + RTC; lacks AutoStore® - requires external battery for STORE; no software STORE sequence. | No capacitor-based STORE; higher BOM cost due to mandatory lithium battery and holder. | Select when legacy STK17T88 footprint compatibility is mandatory and battery maintenance is acceptable. |
| FM31L278-G | 256 Kbit FRAM + RTC; unlimited endurance; 100 ns access; no STORE/RECALL latency; uses VBAT-only RTC backup. | No STORE/RECALL timing uncertainty; eliminates VCAP sizing and charge-pump reliability concerns. | Select when system prioritizes write-cycle endurance over access speed and requires deterministic RTC-only backup. |
Compared with STK17T88-350I and FM31L278-G, CY14B256K-SP45XC uniquely balances 45 ns speed, capacitor-backed STORE, and software-controlled nonvolatile operations - making it optimal for cost-sensitive industrial designs where battery-free reliability is critical.
Availability
CY14B256K-SP45XC is available at Aetrix Electronics and suitable for industrial control systems, medical device data logging, smart metering infrastructure, and automotive black box recorders requiring stable component supply across extended product lifecycles.
Supply support for CY14B256K-SP45XC 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) is a fabless semiconductor company specializing in high-reliability memory, PSoC, and timing solutions for industrial and automotive markets.
CY14B256K belongs to Cypress's nvSRAM product line, engineered specifically for mission-critical applications where volatile memory must retain state across uncontrolled power loss without battery dependency.
FAQ
What is the minimum VCAP capacitance required for reliable AutoStore® operation?
The datasheet specifies a minimum VCAP value of 10 µF for 45 ns grade devices. This ensures sufficient stored energy to complete a full STORE cycle when VCC drops below VSWITCH (2.7 V). Larger capacitors up to 100 µF are supported but require validation with Cypress to avoid excessive inrush current damaging the internal pass transistor.
Can the RTC operate independently while SRAM is being accessed?
Yes - the RTC runs continuously from VRTCcap or VRTCbat regardless of SRAM activity. Its oscillator, calendar logic, and alarm registers function autonomously; no arbitration or gating is required between RTC and memory operations.
How does the CY14B256K-SP45XC prevent accidental STORE initiation during firmware updates?
Hardware and AutoStore® operations are inhibited unless at least one WRITE has occurred since the last STORE or RECALL. Software STORE requires an exact six-address CE-controlled READ sequence - any intervening access aborts the sequence, ensuring immunity to spurious firmware writes.
Is the INT pin compatible with 1.8 V logic systems?
No - INT is a 3 V domain signal. When configured as push-pull, its VOL is ≤0.4 V and VOH is ≥2.4 V at VCC = 3.0 V. Direct interfacing with 1.8 V GPIO requires level translation; open-drain mode allows external pull-up to 1.8 V if sink current is limited to 1 mA.
CY14B256K-SP45XC 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
CY14B256K-SP45XC FAQ
1.How can I place an order for CY14B256K-SP45XC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY14B256K-SP45XC 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-SP45XC reliable?
The price and inventory of CY14B256K-SP45XC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY14B256K-SP45XC is usually 5 days.
3.What payment methods are accepted for CY14B256K-SP45XC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY14B256K-SP45XC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY14B256K-SP45XC?
CY14B256K-SP45XC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY14B256K-SP45XC 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-SP45XC?
For technical support, including CY14B256K-SP45XC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY14B256K-SP45XC requirements.
6.How does Aetrix verify that CY14B256K-SP45XC is sourced from the original manufacturer or authorized distributors?
All CY14B256K-SP45XC 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-SP45XC meets industry standards.
7.What is the process for return or replacement of CY14B256K-SP45XC?
All CY14B256K-SP45XC units undergo pre-shipment inspection (PSI). If there is an issue with CY14B256K-SP45XC, 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-SP45XC part is unused and in its original packaging.
Return procedure for CY14B256K-SP45XC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CY14B256K-SP45XC Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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