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Infineon Technologies STK14CA8-NF35I
- Part No.:
- STK14CA8-NF35I
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 32-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
STK14CA8-NF35I.pdf
- Description:
- IC NVSRAM 1MBIT PARALLEL 32SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,808
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Product details
Overview
STK14CA8-NF35I from Cypress Semiconductor is a 128K × 8 (1 Mb) nonvolatile static RAM with integrated QuantumTrap storage, operating at 3.0V ±10%, offering 35 ns read/write cycle time, automatic STORE on power loss, and automatic RECALL on power-up. It delivers unlimited SRAM read/write endurance, 20-year data retention at 55°C, and supports industrial temperature range (–40°C to +85°C) in 32-pin SOIC package. Used in metering, industrial PLCs, and network equipment where data persistence during brownouts is critical.
For engineers reviewing the STK14CA8-NF35I datasheet, STK14CA8-NF35I pinout, STK14CA8-NF35I application, or STK14CA8-NF35I equivalent, key selection criteria include AutoStore timing (12.5 ms), VCAP capacitor requirement (17–120 μF), HSB hardware store busy signaling, software-controlled STORE/RECALL capability, and compatibility with standard SRAM interface timing.
Technical Context
The STK14CA8-NF35I integrates a full 1 Mb SRAM array with per-cell QuantumTrap nonvolatile storage, enabling atomic STORE/RECALL without external controllers. Its dual-mode operation-AutoStore triggered by VCC drop below 2.65 V and software/hardware-initiated STORE-ensures deterministic data preservation independent of system firmware state.
All memory access follows standard asynchronous SRAM protocol with active-low E (chip enable), G (output enable), and W (write enable). The HSB pin provides real-time status of STORE/RECALL execution, while VCAP supplies hold-up energy via an external capacitor to complete STORE within 12.5 ms even during rapid power collapse.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 128K × 8 = 1 Mb SRAM with integrated nonvolatile storage per cell |
| Access/Cycle Time | 35 ns - defines maximum sustained read/write throughput in legacy bus systems |
| VCC Operating Range | 2.7 V to 3.6 V - compatible with 3.3 V logic rails including ±10% tolerance |
| Nonvolatile STORE Duration | 12.5 ms - determines minimum required VCAP capacitance and hold-up time design margin |
| Data Retention | 20 years at 55°C - specifies guaranteed data integrity without refresh or power |
| Operating Temperature | –40°C to +85°C - validated for industrial control and outdoor metering environments |
| STORE Endurance | 200,000 cycles - sets lifetime limit for frequent nonvolatile save operations |
Pinout & Package
STK14CA8-NF35I is packaged in a 32-pin Small Outline Integrated Circuit (SOIC) with 0.3 inch body width and RoHS-compliant finish. Pin layout matches JEDEC MS-012AC, supporting standard PCB assembly and thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A16–A0 | Input | 17-bit address bus selecting one of 131,072 bytes; A16 enables full 1 Mb decoding |
| DQ7–DQ0 | I/O | 8-bit bidirectional data bus; tri-stated when G high or E high |
| E | Input | Active-low chip enable; latches address on falling edge and initiates access |
| W | Input | Active-low write enable; controls SRAM write timing relative to E and address |
| G | Input | Active-low output enable; gates DQ drivers during reads; high = high-impedance |
| HSB | I/O | Open-drain hardware store busy indicator; pulled low externally to trigger STORE |
| VCAP | Power | Connection point for external storage capacitor (17–120 μF, 5 V rated) supplying STORE energy |
| VCC | Power | 3.0 V supply input; powers both SRAM and QuantumTrap circuitry |
| VSS | Power | Ground reference for all digital and analog functions |
Key Features
| Feature | Design Value |
|---|---|
| Automatic STORE on Power Loss | Detects VCC drop below 2.65 V and autonomously transfers SRAM contents to nonvolatile cells within 12.5 ms |
| Software-Controlled STORE/RECALL | Executes nonvolatile save or restore via command sequences without hardware intervention |
| Unlimited SRAM Read/Write Endurance | Enables continuous logging or buffer cycling without wear-out concerns typical of flash or EEPROM |
| 20-Year Data Retention | Guarantees data integrity over product lifetime in sealed industrial enclosures at elevated ambient temperatures |
| Hardware STORE Trigger via HSB | Allows external microcontroller or supervisor IC to initiate STORE synchronously with system events |
Applications
| Smart Electricity Metering | Industrial Programmable Logic Controllers |
|---|---|
|
Use Scenario: Storing cumulative kWh readings and tariff logs during grid brownouts or battery backup transitions. IC Role / Device Role / Timing Role: Nonvolatile SRAM buffer holding critical metering registers with sub-13 ms STORE latency. Use Value: Prevents data loss during <100 ms power interruptions common in distribution networks. |
Use Scenario: Preserving I/O state, ladder logic variables, and fault history across unexpected AC power failures. IC Role / Device Role / Timing Role: Real-time memory with deterministic RECALL on power-up to restore operational context. Use Value: Eliminates need for external backup batteries or supercapacitor circuits in DIN-rail mounted controllers. |
| Telecom Line Cards | Medical Diagnostic Equipment |
|
Use Scenario: Caching configuration tables and session state in carrier-grade DSLAMs and OLTs subject to frequent maintenance resets. IC Role / Device Role / Timing Role: Drop-in SRAM replacement providing persistent register storage without firmware modification. Use Value: Maintains service continuity and reduces boot-time reinitialization overhead after hot-swap events. |
Use Scenario: Securing calibration coefficients, patient waveform buffers, and diagnostic logs during emergency shutdowns. IC Role / Device Role / Timing Role: Fail-safe memory ensuring regulatory compliance with IEC 62304 data retention requirements. Use Value: Meets 20-year archival mandate for clinical device audit trails without periodic refresh. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STK14C88-NF35I | Same 1 Mb density and 35 ns speed, but uses newer SONOS-based nonvolatile technology with lower VCAP current (2 mA vs 3 mA) | Requires smaller VCAP capacitor (4.7 μF min); better suited for space-constrained designs | Select when board area or capacitor footprint is constrained and newer process qualification is acceptable |
| FM1808-35-SG | 1 Mb FRAM with 35 ns access, no VCAP capacitor needed, but limited to 10¹⁴ read/write cycles (vs unlimited SRAM endurance) | No external capacitor or STORE timing constraints; however, endurance is finite and retention drops above 85°C | Select when eliminating external components is prioritized over multi-decade data retention at high temperature |
Compared with STK14C88-NF35I and FM1808-35-SG, the STK14CA8-NF35I uniquely combines unlimited SRAM endurance, guaranteed 20-year retention at 55°C, and deterministic 12.5 ms STORE-making it optimal for long-lifecycle industrial systems where reliability outweighs component count reduction.
Availability
STK14CA8-NF35I is available at Aetrix Electronics and suitable for smart metering, industrial automation, telecom infrastructure, and medical diagnostics requiring stable component supply and long-term obsolescence support.
Supply support for STK14CA8-NF35I 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 U.S.-based semiconductor company specializing in memory, microcontrollers, and programmable solutions for industrial, automotive, and communications markets.
The STK14CA8 belongs to Cypress's nvSRAM product line, designed specifically to replace battery-backed SRAM in mission-critical systems where maintenance-free, long-term data retention is mandatory.
FAQ
What is the minimum VCAP capacitor value required for reliable AutoStore operation?
The datasheet specifies a minimum VCAP capacitance of 17 μF (5 V rated) between VCAP and VSS to ensure successful STORE completion under worst-case conditions (VCC = 2.7 V, TA = 85°C). Using 47 μF or higher is recommended for margin against capacitor aging and ESR increase over time.
Can STK14CA8-NF35I be used as a direct replacement for standard SRAM in existing designs?
Yes-its pinout, timing, and electrical interface are fully compatible with industry-standard 128K × 8 SRAMs (e.g., AS6C1008, IS61LV1024). No changes to address/data bus routing or timing constraints are needed; only VCAP addition and optional HSB monitoring are required for nonvolatile functionality.
Does STK14CA8-NF35I support software STORE/RECALL without external hardware?
Yes-software-controlled STORE and RECALL are implemented via specific address/data command sequences defined in the datasheet (e.g., writing 0x00 to address 0x0000 triggers STORE). These operations require no external signals beyond standard E/G/W control lines and do not depend on HSB or VCAP voltage level.
Is STK14CA8-NF35I recommended for new designs?
No-the Cypress datasheet explicitly marks STK14CA8 as "Not Recommended for New Designs." It remains supported for legacy program continuity, but newer alternatives like STK14C88-NF35I (SONOS-based) or Infineon's updated nvSRAM families offer improved power efficiency, smaller VCAP, and extended lifecycle support.
STK14CA8-NF35I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 32-SOIC (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:
- 1Mbit
- Memory Organization:
- 128K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 35ns
- Access Time:
- 35 ns
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-SOIC
STK14CA8-NF35I FAQ
1.How can I place an order for STK14CA8-NF35I through Aetrix?
Please submit a Request for Quotation (RFQ) for STK14CA8-NF35I 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 STK14CA8-NF35I reliable?
The price and inventory of STK14CA8-NF35I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK14CA8-NF35I is usually 5 days.
3.What payment methods are accepted for STK14CA8-NF35I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK14CA8-NF35I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK14CA8-NF35I?
STK14CA8-NF35I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK14CA8-NF35I 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 STK14CA8-NF35I?
For technical support, including STK14CA8-NF35I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK14CA8-NF35I requirements.
6.How does Aetrix verify that STK14CA8-NF35I is sourced from the original manufacturer or authorized distributors?
All STK14CA8-NF35I 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 STK14CA8-NF35I meets industry standards.
7.What is the process for return or replacement of STK14CA8-NF35I?
All STK14CA8-NF35I units undergo pre-shipment inspection (PSI). If there is an issue with STK14CA8-NF35I, 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 STK14CA8-NF35I part is unused and in its original packaging.
Return procedure for STK14CA8-NF35I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STK14CA8-NF35I Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
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24LC01BT-I/OT
Microchip Technology
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M24C02-FMC6TG
STMicroelectronics
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
Microchip Technology
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AT24C04C-SSHM-T
Microchip Technology
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24LC01BT-I/SN
Microchip Technology
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24AA02UIDT-I/OT
Microchip Technology
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AT24C08C-STUM-T
Microchip Technology
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