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Infineon Technologies STK14CA8-RF35
- Part No.:
- STK14CA8-RF35
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
STK14CA8-RF35.pdf
- Description:
- IC NVSRAM 1MBIT PARALLEL 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,938
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Product details
Overview
STK14CA8-RF35 from Cypress Semiconductor is a 128K × 8 (1 Mb) nonvolatile static RAM with integrated QuantumTrap storage, delivering 35 ns read/write cycle time, automatic power-loss STORE and power-up RECALL, and unlimited SRAM read/write endurance. It operates from a single 3.0V ±10% supply and retains data for 20 years at 55°C. Used in industrial control modules where battery-free nonvolatility and fast SRAM access are required.
For engineers reviewing the STK14CA8-RF35 datasheet, STK14CA8-RF35 pinout, STK14CA8-RF35 application, or STK14CA8-RF35 equivalent, key selection criteria include AutoStore timing (12.5 ms), VCAP capacitor requirement (17–120 µF), HSB hardware store busy signaling, and compatibility with standard parallel SRAM interfaces in legacy industrial systems.
Technical Context
The STK14CA8-RF35 integrates a full 1024 × 1024 SRAM array with per-cell QuantumTrap nonvolatile storage, enabling atomic STORE/RECALL without external controllers. Its dual-mode operation supports both automatic power-loss detection and software- or hardware-initiated STORE/RECALL cycles via HSB and command sequences.
It uses standard parallel interface timing with E (chip enable), G (output enable), W (write enable), and 17 address lines (A0–A16) to access 131,072 bytes. The VCAP pin requires an external capacitor to sustain STORE during VCC dropout, and HSB provides real-time status of active nonvolatile operations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 128K × 8 = 1 Mb SRAM with monolithic QuantumTrap nonvolatile backup per cell |
| Access Time | 35 ns - defines minimum clock-to-data delay in synchronous bus designs |
| STORE Duration | 12.5 ms - maximum time SRAM contents take to transfer to nonvolatile storage |
| Data Retention | 20 years at 55°C - guarantees long-term data integrity without refresh or power |
| VCAP Capacitance | 17–120 µF - external capacitor range required to support STORE under worst-case VCC droop |
| Operating Voltage | 2.7–3.6 V - single-supply operation compatible with 3.3V logic systems |
| Endurance | 200,000 STORE cycles - lifetime limit on nonvolatile write operations |
Pinout & Package
STK14CA8-RF35 is packaged in a 48-pin SSOP (RF package), RoHS-compliant, with 0.635 mm pitch and footprint optimized for space-constrained industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A16–A0 | Input | 17-bit address bus selecting one of 131,072 byte locations |
| DQ7–DQ0 | I/O | 8-bit bidirectional data bus; tri-stated when G or E inactive |
| E | Input | Active-low chip enable controlling device selection and internal timing initiation |
| W | Input | Active-low write enable; latches data on DQ bus at falling edge of E |
| G | Input | Active-low output enable; controls DQ driver activation during reads |
| HSB | I/O | Open-drain hardware store busy indicator; pulled low externally to trigger STORE |
| VCAP | Power | Connection point for external storage capacitor supplying energy during power loss |
| VCC | Power | +2.7V to +3.6V main supply; powers SRAM core and control logic |
| VSS | Power | Ground reference for all digital and analog circuitry |
Key Features
| Feature | Design Value |
|---|---|
| AutoStore on Power Loss | Automatic, capacitor-powered STORE triggered by VCC drop below 2.65 V - eliminates need for backup batteries or supercaps |
| Unlimited SRAM Endurance | True infinite read/write cycles to volatile SRAM array - no wear-out mechanism like flash or EEPROM |
| Software-Controlled STORE/RECALL | Executed via command sequences without external hardware - enables deterministic nonvolatile updates in firmware |
| Hardware STORE Initiation | External pull-down of HSB initiates STORE independent of CPU activity - critical for fail-safe logging |
| 20-Year Data Retention | Validated at 55°C ambient - ensures data survival across product lifecycles in uncooled enclosures |
Applications
| Industrial PLC Data Logging | Medical Device Configuration Storage |
|---|---|
|
Use Scenario: Storing runtime parameters and alarm history in programmable logic controllers during unexpected mains failure. IC Role / Device Role / Timing Role: Nonvolatile SRAM providing zero-latency read/write access during normal operation and atomic STORE on brownout. Use Value: Eliminates battery replacement service intervals while preserving last-known state within 12.5 ms of power loss. |
Use Scenario: Holding calibration coefficients and user preferences in portable diagnostic equipment with intermittent power. IC Role / Device Role / Timing Role: Parallel-interface nvSRAM acting as persistent configuration register bank with SRAM-speed access. Use Value: Enables instant resume after power cycling without boot-time EEPROM load delays or checksum validation overhead. |
| Avionics Black Box Buffering | Energy Meter Firmware Parameter Backup |
|
Use Scenario: Capturing flight sensor snapshots in real time, with guaranteed retention if aircraft electrical system fails. IC Role / Device Role / Timing Role: High-reliability memory buffer with hardware-triggered STORE via HSB tied to power monitor IC. Use Value: Meets DO-160 Section 22 transient immunity requirements by completing STORE before VCC falls below 2.65 V. |
Use Scenario: Preserving tariff schedules and billing counters in smart electricity meters exposed to grid instability. IC Role / Device Role / Timing Role: Nonvolatile memory replacing FRAM/EEPROM in ANSI C12.22-compliant metering SoCs. Use Value: Supports 200K STORE cycles over 15-year field life - exceeds ANSI C12.19 write-cycle requirements by 4×. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STK14CA8-35I | Same die, industrial temperature grade (–40°C to +85°C); identical timing and pinout | Required for extended-temperature deployments; same VCAP and STORE timing specs | Select when operating ambient exceeds 70°C or requires AEC-Q200 alignment |
| FM1808-35-SG | 4-Mb nvSRAM with 35 ns access, but uses different command protocol and lacks HSB pin | No hardware STORE trigger; relies on software polling or external power-fail detection | Choose only if higher density is needed and firmware can accommodate alternate STORE sequencing |
Compared with STK14CA8-35I, the RF35 offers identical functionality in commercial temp range; compared with FM1808-35-SG, it provides deterministic hardware STORE initiation and simpler integration in legacy SRAM-based designs.
Availability
STK14CA8-RF35 is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, avionics black box recorders, and smart energy meters requiring stable component supply and long-term obsolescence management.
Supply support for STK14CA8-RF35 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 memory and programmable solutions for industrial, automotive, and communications markets.
The STK14CA8 series was developed to replace battery-backed SRAM and EEPROM in mission-critical systems demanding zero-maintenance nonvolatility and true SRAM performance.
FAQ
What is the function of the VCAP pin?
The VCAP pin connects to an external 17–120 µF capacitor that supplies energy during VCC dropout, enabling the AutoStore operation to complete even with abrupt power loss. This capacitor must be rated for ≥5 V and placed close to the VCAP pin with low-inductance routing to ensure reliable STORE execution within 12.5 ms.
Can STK14CA8-RF35 be used as a drop-in replacement for standard SRAM?
Yes - it is pin- and timing-compatible with industry-standard 128K × 8 parallel SRAMs (e.g., IS61LV1024). All control signals (E, G, W), address (A0–A16), and data (DQ0–DQ7) match. No firmware or layout changes are needed unless leveraging AutoStore/RECALL features.
How does hardware STORE differ from software STORE?
Hardware STORE is initiated by pulling HSB low externally, independent of CPU activity - ideal for fail-safe scenarios. Software STORE uses command sequences issued over the data bus and requires CPU intervention. Both execute the same 12.5 ms STORE cycle and use the same VCAP energy source.
Is STK14CA8-RF35 recommended for new designs?
No - Cypress has marked STK14CA8 as "Not Recommended for New Designs" (NRND) due to end-of-life planning. However, Aetrix Electronics maintains active inventory and long-term supply commitments for existing industrial programs requiring backward compatibility and lifecycle continuity.
STK14CA8-RF35 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:
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
STK14CA8-RF35 FAQ
1.How can I place an order for STK14CA8-RF35 through Aetrix?
Please submit a Request for Quotation (RFQ) for STK14CA8-RF35 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-RF35 reliable?
The price and inventory of STK14CA8-RF35 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK14CA8-RF35 is usually 5 days.
3.What payment methods are accepted for STK14CA8-RF35?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK14CA8-RF35 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK14CA8-RF35?
STK14CA8-RF35 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK14CA8-RF35 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-RF35?
For technical support, including STK14CA8-RF35 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK14CA8-RF35 requirements.
6.How does Aetrix verify that STK14CA8-RF35 is sourced from the original manufacturer or authorized distributors?
All STK14CA8-RF35 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-RF35 meets industry standards.
7.What is the process for return or replacement of STK14CA8-RF35?
All STK14CA8-RF35 units undergo pre-shipment inspection (PSI). If there is an issue with STK14CA8-RF35, 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-RF35 part is unused and in its original packaging.
Return procedure for STK14CA8-RF35:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STK14CA8-RF35 Tags
-
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
Microchip Technology
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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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