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Infineon Technologies STK14CA8-RF25I
- Part No.:
- STK14CA8-RF25I
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
STK14CA8-RF25I.pdf
- Description:
- IC NVSRAM 1MBIT PARALLEL 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,777
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Product details
Overview
STK14CA8-RF25I from Cypress Semiconductor is a 128K × 8 (1 Mb) nonvolatile static RAM with integrated QuantumTrap storage, operating at 3.0V ±10%, offering 25 ns read access 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). Used in metering, industrial PLCs, and network equipment where data persistence during brownouts is critical.
For engineers reviewing the STK14CA8-RF25I datasheet, STK14CA8-RF25I pinout, STK14CA8-RF25I application, or STK14CA8-RF25I equivalent, key selection factors include AutoStore timing (12.5 ms), VCAP capacitor requirement (17–120 µF), HSB pin behavior for hardware-triggered STORE, and compatibility with standard SRAM bus protocols without external controllers.
Technical Context
The STK14CA8-RF25I integrates a 1024 × 1024 SRAM array with per-cell QuantumTrap nonvolatile elements, enabling monolithic STORE/RECALL without backup batteries or external controllers. Its logic block includes dedicated power-control circuitry that monitors VCC and triggers STORE when voltage drops below 2.65 V (VSWITCH).
It supports three STORE modes: AutoStore (hardware-detected power loss), hardware STORE via HSB pin assertion, and software STORE via command sequence. RECALL occurs automatically at power-up and is also software-controllable. All operations preserve full SRAM interface timing compliance (E, G, W control signals).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 128K × 8 = 1 Mb; matches standard 8-bit microcontroller data bus width without address multiplexing. |
| Read Access Time | 25 ns; enables direct interfacing with 33 MHz CPU buses without wait states. |
| VCC Operating Range | 2.7 V to 3.6 V; compatible with 3.3 V systems including industrial I/O modules and smart meters. |
| STORE Cycle Duration | 12.5 ms (industrial grade ≤15 ms); defines minimum hold-up time required from VCAP capacitor during power failure. |
| Data Retention | 20 years at 55°C; ensures long-term firmware or calibration data integrity in unattended field deployments. |
| Nonvolatile Cycles | 200,000 STORE operations; supports frequent logging in telemetry applications with daily power cycling. |
| Operating Temperature | –40°C to +85°C; qualified for industrial automation environments including motor drives and remote RTUs. |
Pinout & Package
STK14CA8-RF25I uses a 48-pin SSOP package (RF suffix), RoHS-compliant, with 0.5 mm pitch and 12.0 mm × 7.5 mm footprint. Pinout optimized for minimal PCB area and compatibility with legacy SRAM layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A16–A0 | Input | 17-bit address bus; selects one of 131,072 bytes; A16 enables full 1 Mb addressing without bank switching. |
| DQ7–DQ0 | I/O | 8-bit bidirectional data bus; tri-stated when G high or E high; compatible with standard SRAM read/write cycles. |
| E | Input | Active-low chip enable; latches address on falling edge; controls SRAM access and write initiation. |
| W | Input | Active-low write enable; initiates SRAM write on falling edge of E; must be high during reads. |
| G | Input | Active-low output enable; enables DQ drivers during reads; high state forces DQ to high-impedance. |
| HSB | I/O | Hardware Store Busy: open-drain output indicating STORE in progress; pulled low externally to initiate hardware STORE. |
| VCAP | Power | AutoStore capacitor connection point; requires 17–120 µF tantalum/ceramic capacitor to VSS for energy hold-up during STORE. |
| VCC / VSS | Power | 3.0 V supply (2.7–3.6 V) and ground; VCC powers both SRAM and QuantumTrap logic; no separate NV supply needed. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic STORE on Power Loss | Detects VCC drop below 2.65 V and initiates nonvolatile store within 150 µs; eliminates need for external voltage monitor or supervisor IC. |
| Unlimited SRAM Endurance | Full read/write cycle lifetime matching standard SRAM - no wear leveling or write-limiting logic required in host firmware. |
| Software-Controlled STORE/RECALL | Executed via 3-byte command sequence on DQ bus; enables deterministic data save before controlled shutdown or firmware update. |
| Hardware STORE Trigger via HSB | External pull-down of HSB initiates immediate STORE independent of VCC level; supports custom power-fail detection circuits. |
| 20-Year Data Retention | Validated at 55°C ambient; ensures calibration tables, configuration registers, and event logs remain intact over product lifecycle. |
Applications
| Smart Energy Metering | Industrial PLC Data Logging |
|---|---|
|
Use Scenario: Storing cumulative kWh readings and tamper-event timestamps during grid brownouts or battery-backed power transitions. IC Role / Device Role / Timing Role: Nonvolatile SRAM buffer between metrology ASIC and MCU; retains last valid reading across power interruptions. Use Value: Eliminates need for EEPROM wear management or FRAM cost premium while guaranteeing atomic STORE within 12.5 ms. |
Use Scenario: Capturing sensor history and fault codes in programmable logic controllers deployed in factory automation lines. IC Role / Device Role / Timing Role: Real-time data scratchpad with persistent backup; interfaces directly to 8-bit/16-bit microcontroller address/data bus. Use Value: Supports >100,000 daily STORE cycles over 10+ years without degradation, unlike flash-based alternatives. |
| Network Equipment Configuration | Medical Diagnostic Device Calibration |
|
Use Scenario: Preserving switch/router configuration and session state during hot-swap power module replacement or transient AC dropout. IC Role / Device Role / Timing Role: SRAM-compatible configuration memory with zero-software overhead STORE/RECALL; transparent to existing boot firmware. Use Value: Enables sub-20 ms recovery after power restoration - faster than flash reprogramming and immune to write-cycle limits. |
Use Scenario: Storing factory-calibrated sensor offsets and linearity coefficients in portable ultrasound or ECG devices subject to frequent power cycling. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed as standard memory-mapped region; survives 10,000+ power cycles. Use Value: Meets IEC 62304 Class B requirements for data integrity without external error correction or redundant storage schemes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STK14C88-RF25I | Same architecture but 256K × 8 (2 Mb) density; identical timing, VCAP, and pinout; requires larger PCB footprint. | Used where extended log depth or dual-bank configuration is needed; not drop-in for 1 Mb designs. | Select only if memory capacity expansion is required; otherwise, STK14CA8-RF25I offers optimal cost-per-bit for 1 Mb use cases. |
| FM24CL16B-G | F-RAM from Cypress (now Infineon); 16 Kb I²C interface; no VCAP required; 10¹⁴ write cycles; slower serial access (~400 kHz). | Suitable for low-bandwidth parameter storage; incompatible with parallel SRAM bus; requires I²C driver integration. | Choose for ultra-low-power, infrequent-write applications where parallel bus is unavailable; avoid for real-time SRAM replacement. |
Compared with STK14C88-RF25I, the STK14CA8-RF25I provides precise 1 Mb capacity with identical industrial qualification and timing, avoiding over-provisioning. Against FM24CL16B-G, it delivers full SRAM bus compatibility and deterministic 25 ns access - critical for latency-sensitive control loops.
Availability
STK14CA8-RF25I is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, and network infrastructure requiring stable component supply, long-life data retention, and seamless SRAM interface compatibility.
Supply support for STK14CA8-RF25I 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 memory, microcontrollers, and connectivity solutions for industrial, automotive, and IoT markets.
The STK14CA8 belongs to Cypress's nvSRAM product line, designed specifically to replace battery-backed SRAM and EEPROM in mission-critical systems requiring instant nonvolatility without firmware complexity or external components.
FAQ
What is the role of the VCAP pin and what capacitor value is required?
The VCAP pin supplies hold-up energy during power-loss STORE operations. A 17–120 µF capacitor rated for ≥5 V must be placed between VCAP and VSS. Typical design uses a 47 µF tantalum capacitor; lower values reduce STORE margin, higher values increase start-up time but improve reliability under deep brownouts.
Does STK14CA8-RF25I require special initialization or firmware drivers?
No. It operates as a drop-in replacement for standard 3.0 V SRAMs. AutoStore and RECALL are fully autonomous. Software-controlled STORE/RECALL uses a documented 3-byte command sequence sent on the DQ bus - no dedicated driver library is needed, though example code is available in Cypress AN91172.
Can the HSB pin be left unconnected?
Yes. HSB has an internal weak pull-up and may float if unused. When connected, pulling HSB low initiates hardware STORE; monitoring its low-to-high transition confirms STORE completion. Leaving it unconnected disables hardware-triggered STORE but preserves AutoStore and software STORE functionality.
Is STK14CA8-RF25I still recommended for new designs?
No - Cypress documentation explicitly marks STK14CA8 as "Not Recommended for New Designs." It remains actively manufactured and supported for legacy program continuity, but Infineon recommends migrating to the newer ENVIRO™ nvSRAM family (e.g., CY14B101QN) for new projects due to improved power efficiency and extended temperature range.
STK14CA8-RF25I 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:
- 25ns
- Access Time:
- 25 ns
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
STK14CA8-RF25I FAQ
1.How can I place an order for STK14CA8-RF25I through Aetrix?
Please submit a Request for Quotation (RFQ) for STK14CA8-RF25I 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-RF25I reliable?
The price and inventory of STK14CA8-RF25I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK14CA8-RF25I is usually 5 days.
3.What payment methods are accepted for STK14CA8-RF25I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK14CA8-RF25I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK14CA8-RF25I?
STK14CA8-RF25I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK14CA8-RF25I 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-RF25I?
For technical support, including STK14CA8-RF25I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK14CA8-RF25I requirements.
6.How does Aetrix verify that STK14CA8-RF25I is sourced from the original manufacturer or authorized distributors?
All STK14CA8-RF25I 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-RF25I meets industry standards.
7.What is the process for return or replacement of STK14CA8-RF25I?
All STK14CA8-RF25I units undergo pre-shipment inspection (PSI). If there is an issue with STK14CA8-RF25I, 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-RF25I part is unused and in its original packaging.
Return procedure for STK14CA8-RF25I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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