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Infineon Technologies STK14CA8-RF45I
- Part No.:
- STK14CA8-RF45I
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
STK14CA8-RF45I.pdf
- Description:
- IC NVSRAM 1MBIT PARALLEL 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,214
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Product details
Overview
STK14CA8-RF45I from Cypress Semiconductor is a 1 Mb (128K × 8) nonvolatile static RAM with integrated QuantumTrap storage, operating at 3.0V ±10%, delivering 45 ns read/write cycle time, automatic power-loss STORE and power-up RECALL, and 20-year data retention at 55°C. It serves as a drop-in SRAM replacement in industrial control modules requiring persistent memory without external backup circuitry.
For engineers reviewing the STK14CA8-RF45I datasheet, STK14CA8-RF45I pinout, STK14CA8-RF45I application, or STK14CA8-RF45I equivalent, key selection criteria include AutoStore timing (12.5 ms), VCAP capacitor requirement (17–120 µF), HSB hardware store busy signaling, and SSOP-48 package compatibility with legacy board layouts.
Technical Context
The STK14CA8-RF45I integrates a 1024 × 1024 SRAM array with per-cell QuantumTrap nonvolatile storage, enabling monolithic STORE/RECALL without external controllers. Its dual-cycle architecture supports both hardware-triggered STORE via HSB pin assertion and software-controlled STORE using soft-sequence commands.
Operation relies on VCAP-supplied hold-up energy during VCC collapse below 2.65 V (VSWITCH), initiating automatic STORE within 12.5 ms. Power-up RECALL completes in ≤20 ms after VCC exceeds VSWITCH, restoring full SRAM contents before system initialization begins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mb (128K × 8) - provides byte-wide interface compatible with 8-bit microcontrollers and legacy bus architectures. |
| Access Time | 45 ns - ensures timing compliance with 22 MHz synchronous bus systems without wait states. |
| VCC Range | 2.7 V to 3.6 V - supports single-supply operation across industrial temperature range (–40°C to +85°C). |
| STORE Duration | 12.5 ms - defines minimum VCAP hold-up time requirement; requires ≥17 µF capacitor rated for 5 V. |
| Data Retention | 20 years at 55°C - guarantees long-term data integrity in unpowered storage without battery or EEPROM wear-out concerns. |
| Endurance | 200,000 STORE cycles - limits total nonvolatile write operations over product lifetime; unlimited SRAM reads/writes. |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded applications including PLCs and motor drives. |
Pinout & Package
STK14CA8-RF45I is packaged in a 48-pin SSOP (RF suffix), measuring 15.4 mm × 7.6 mm with 0.5 mm pitch. Pin 1 is marked by a notch or dot; pin 24 is VSS (ground), pin 1 is A16, and pin 48 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A16–A0 | Address Input | 17-bit address bus selecting one of 131,072 bytes; A16 enables full 1 Mb addressing. |
| DQ7–DQ0 | Bidirectional Data I/O | 8-bit parallel data path; tri-stated when G or E is high; supports standard SRAM read/write protocols. |
| E | Chip Enable (active low) | Primary device select; falling edge latches address; must be high during STORE/RECALL. |
| W | Write Enable (active low) | Controls write initiation; must be high during READ; ignored during STORE/RECALL. |
| G | Output Enable (active low) | Enables DQ drivers during READ; deassertion forces high-impedance output state. |
| HSB | Hardware Store Busy (open-drain) | Drives low during STORE/RECALL; can initiate STORE when externally pulled low; weak internal pull-up. |
| VCAP | AutoStore Capacitor Terminal | Connects external 17–120 µF capacitor to sustain STORE operation during VCC dropout. |
| VCC / VSS | Power / Ground | Single 3.0V supply; VSS pins (pins 24, 32) must be low-inductance grounded for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic STORE on Power Loss | Detects VCC drop below 2.65 V and initiates nonvolatile save without firmware intervention or external circuitry. |
| Software-Controlled STORE/RECALL | Executes via 3-byte command sequence (0x20, 0x20, 0x20), enabling deterministic save points in critical firmware states. |
| Unlimited SRAM Read/Write Endurance | Eliminates wear-leveling logic and endurance management overhead typical of flash or EEPROM-based alternatives. |
| 20-Year Nonvolatile Retention | Validated at 55°C; removes need for periodic refresh or battery-backed volatile memory in field-deployed equipment. |
| Hardware STORE Trigger (HSB) | Allows external controller to force immediate STORE via pin assertion-critical for emergency shutdown sequences. |
Applications
| Industrial PLC Data Logging | Medical Device Configuration Storage |
|---|---|
|
Use Scenario: Storing runtime parameters, calibration offsets, and alarm history in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile SRAM providing instant-access memory with guaranteed data persistence across unexpected AC loss or maintenance power cycling. Use Value: Eliminates reliance on slow EEPROM writes or battery-backed RAM; retains last-known state within 12.5 ms of power failure. |
Use Scenario: Holding user-configurable therapy settings, sensor calibration data, and audit logs in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Fail-safe memory element ensuring regulatory-compliant data retention during battery swaps or main power interruptions. Use Value: Meets IEC 62304 Class C requirements for data integrity without external supervision or watchdog timers. |
| Telecom Base Station Control Registers | Automotive Body Control Module (BCM) |
|
Use Scenario: Preserving radio channel assignments, RF tuning coefficients, and fault counters in remote radio units operating in harsh thermal environments. IC Role / Device Role / Timing Role: Industrial-temperature nvSRAM interfacing directly with FPGA or ARM Cortex-M4 host processors via parallel bus. Use Value: Delivers 45 ns access while maintaining 20-year retention at 85°C ambient-exceeding Telcordia GR-468 reliability thresholds. |
Use Scenario: Storing door lock status, lighting profiles, and seat position memory in automotive BCMs subject to load-dump transients and cold-cranking voltage dips. IC Role / Device Role / Timing Role: VCAP-backed memory that activates STORE during brownout events below 2.65 V, independent of MCU firmware response. Use Value: Survives ISO 7637-2 Pulse 4 (cold crank) and Pulse 5a/b (load dump) without data corruption or external protection circuitry. |
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 | 35 ns access time; identical pinout, VCAP, and STORE/RECALL timing; lower ICC1 standby current (55 mA vs. 60 mA at 45 ns). | Suitable where bus timing margin allows slower access; preferred for lower-power industrial gateways with relaxed throughput needs. | Select when system clock frequency ≤28 MHz and average power budget is constrained. |
| AS1C1M8-45TIN | 45 ns access; 3.3 V only (no 2.7 V min); no HSB pin; STORE triggered only by software or VCC threshold (no hardware trigger). | Lacks hardware-initiated STORE capability; requires firmware polling or external supervisor IC for power-fail detection. | Choose only if HSB functionality is unused and design already includes voltage-monitoring circuitry. |
Compared with STK14CA8-35I and AS1C1M8-45TIN, the STK14CA8-RF45I uniquely combines 45 ns speed, hardware STORE initiation via HSB, and full industrial temperature qualification-making it optimal for real-time systems requiring deterministic nonvolatile save under voltage fault conditions.
Availability
STK14CA8-RF45I is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostic instruments, telecom infrastructure units, and automotive body control modules requiring stable component supply with long-lifecycle support.
Supply support for STK14CA8-RF45I 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 where data persistence, speed, and endurance cannot be compromised.
FAQ
What is the minimum required VCAP capacitance for reliable AutoStore operation?
The STK14CA8-RF45I requires a minimum 17 µF capacitor rated for 5 V between VCAP and VSS. This value ensures sufficient energy to complete the 12.5 ms STORE cycle when VCC drops from 2.7 V to 2.65 V. Using capacitors below this rating risks incomplete STORE and data loss; recommended types include low-ESR tantalum or polymer aluminum.
Can the HSB pin be left unconnected in a design?
Yes-the HSB pin has an internal weak pull-up and may be left floating if hardware-initiated STORE is not needed. However, leaving it unconnected forfeits the ability to externally trigger STORE during controlled shutdowns. For fail-safe operation, tie HSB to VCC through a 10 kΩ resistor and drive it low via MCU GPIO when initiating emergency save.
Does the STK14CA8-RF45I support byte-write masking?
No-it does not support individual byte write enable. All eight DQ lines are written simultaneously during a WRITE cycle. To update a single byte, the host must read the full 8-bit word, modify the target byte in local buffer, then write back the entire word. This behavior matches standard asynchronous SRAM protocols.
Is the STK14CA8-RF45I pin-compatible with earlier STK14CA8 variants?
Yes-STK14CA8-RF45I shares identical 48-pin SSOP footprint, pin functions, and electrical characteristics with other RF-suffix variants (e.g., STK14CA8-RF35I). Differences are limited to access time (45 ns), operating temperature grade (industrial), and minor DC current specs; no PCB redesign is needed for speed-grade migration.
STK14CA8-RF45I 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:
- 45ns
- Access Time:
- 45 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-RF45I FAQ
1.How can I place an order for STK14CA8-RF45I through Aetrix?
Please submit a Request for Quotation (RFQ) for STK14CA8-RF45I 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-RF45I reliable?
The price and inventory of STK14CA8-RF45I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK14CA8-RF45I is usually 5 days.
3.What payment methods are accepted for STK14CA8-RF45I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK14CA8-RF45I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK14CA8-RF45I?
STK14CA8-RF45I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK14CA8-RF45I 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-RF45I?
For technical support, including STK14CA8-RF45I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK14CA8-RF45I requirements.
6.How does Aetrix verify that STK14CA8-RF45I is sourced from the original manufacturer or authorized distributors?
All STK14CA8-RF45I 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-RF45I meets industry standards.
7.What is the process for return or replacement of STK14CA8-RF45I?
All STK14CA8-RF45I units undergo pre-shipment inspection (PSI). If there is an issue with STK14CA8-RF45I, 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-RF45I part is unused and in its original packaging.
Return procedure for STK14CA8-RF45I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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