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Infineon Technologies STK12C68-SF25ITR
- Part No.:
- STK12C68-SF25ITR
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
STK12C68-SF25ITR.pdf
- Description:
- IC NVSRAM 64KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,221
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Product details
Overview
STK12C68-SF25ITR from Cypress Semiconductor is a 64 Kbit (8 K × 8) nonvolatile SRAM with QuantumTrap technology, delivering 25 ns access time, AutoStore on power-down (with 68 µF VCAP capacitor), and unlimited SRAM read/write cycles. It operates at single 5 V ±10%, supports software/hardware STORE/RECALL, and is used in industrial control systems requiring persistent memory without battery backup.
For engineers reviewing the STK12C68-SF25ITR datasheet, STK12C68-SF25ITR pinout, STK12C68-SF25ITR application, or STK12C68-SF25ITR equivalent, key selection criteria include AutoStore timing compliance, VCAP capacitor sizing, HSB pin behavior during STORE arbitration, and software STORE address sequence integrity under interrupt latency constraints.
Technical Context
The STK12C68 integrates parallel SRAM and QuantumTrap nonvolatile cells per bit, enabling simultaneous STORE/RECALL across all 8,192 locations. STORE is triggered by power loss (VCC < VSWITCH), HSB assertion, or six-step software address sequence (0x0000 → 0x0F0F); RECALL occurs on power-up or via 0x0F0E sequence.
During STORE, SRAM access is inhibited for tSTORE (max 10 ms); during RECALL, SRAM is cleared then loaded, taking tHRECALL (max 15 ms). The HSB pin serves dual role: open-drain busy indicator (LOW during STORE) and active-LOW hardware trigger, with tDELAY (max 100 ns) allowing in-progress writes to complete before initiation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 64 Kbit (8 K × 8) - supports byte-wide data bus interface without external demultiplexing |
| Access Time | 25 ns - enables direct replacement of standard 25 ns SRAMs in legacy timing-critical control loops |
| Nonvolatile Endurance | 1,000,000 STORE cycles - defines maximum field-replaceable event count before QuantumTrap wear-out |
| Data Retention | 100 years at +25°C - guarantees archival storage without refresh or power |
| VCAP Capacitor | 68 µF ±20%, 6 V rated - minimum capacitance required to sustain full 10 ms STORE under worst-case VCC droop |
| Operating Voltage | 5.0 V ±10% - compatible with legacy 5 V logic rails; no level-shifting needed for CE/OE/WE control |
| Temperature Range | –40°C to +85°C - validated for industrial ambient operation without derating |
Pinout & Package
STK12C68-SF25ITR uses a 28-pin SOIC package (330 mil width), RoHS-compliant, with 300 mil pin pitch and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Input | 13-bit address bus selecting one of 8,192 memory locations; latched on CE/OE/WE transitions |
| DQ0–DQ7 | Bidirectional Data I/O | 8-bit data bus shared for read output and write input; tristated when OE HIGH or during STORE/RECALL |
| CE (E) | Chip Enable | Active-LOW chip select; must be LOW with WE/OE for valid SRAM access; initiates software STORE/RECALL sequence |
| WE (W) | Write Enable | Active-LOW write strobe; held HIGH during AutoStore to prevent bus contention; pulled up externally at power-up |
| OE (G) | Output Enable | Active-LOW output driver control; disables DQ drivers when HIGH to isolate bus during writes or STORE |
| HSB | Hardware Store Busy | Open-drain status/output pin: driven LOW during any STORE (Auto/Hardware/Software); pulled LOW externally to initiate hardware STORE |
| VCAP | AutoStore Capacitor | Internal charge pump node supplying power during VCC loss; requires external 68 µF capacitor to guarantee STORE completion |
| VCC | Power Supply | +5 V ±10% main supply; disconnects from VCAP at VSWITCH (~3.6 V) to trigger AutoStore |
| VSS | Ground | System ground reference; must be low-impedance connection to minimize STORE timing jitter |
Key Features
| Feature | Design Value |
|---|---|
| AutoStore on Power-Down | Zero-software intervention STORE triggered by VCC drop below 3.6 V, using charge stored in external VCAP capacitor |
| Software STORE/RECALL | 6-address CE-controlled read sequence (0x0000→0x0F0F or 0x0F0E) enables deterministic, interrupt-safe nonvolatile operations |
| Hardware STORE Arbitration | HSB pin provides tDELAY (100 ns max) to complete pending writes before STORE, preventing data corruption |
| QuantumTrap Nonvolatile Cell | Embedded per-bit nonvolatile element enabling 100-year retention and 1M STORE endurance without external battery or EEPROM emulation |
| SRAM Compatibility | Pin- and timing-compatible with standard 28-pin 8K×8 SRAMs, allowing drop-in replacement in existing 5 V designs |
Applications
| Industrial PLC Data Logging | Medical Device Parameter Storage |
|---|---|
Use Scenario: Storing real-time sensor calibration coefficients and alarm thresholds in programmable logic controllers during mains power interruption. IC Role / Device Role / Timing Role: Nonvolatile scratchpad memory preserving critical configuration between power cycles without battery maintenance. Use Value: Eliminates battery replacement logistics and failure modes while ensuring sub-10 ms STORE completion before VCC collapse. | Use Scenario: Retaining patient-specific therapy settings and device usage history in portable infusion pumps after battery removal or charging cycles. IC Role / Device Role / Timing Role: Fail-safe configuration vault synchronized with SRAM during normal operation and restored on power-up. Use Value: Guarantees 100-year data retention for regulatory audit trails and avoids EEPROM wear-out limitations in high-write-rate clinical environments. |
| Avionics Black Box Memory | Smart Grid Meter Firmware State |
Use Scenario: Capturing flight control actuator positions and sensor anomalies in aircraft crash survivable recorders during emergency power loss. IC Role / Device Role / Timing Role: High-reliability nonvolatile buffer interfacing directly with 5 V ARINC-429 or MIL-STD-1553 buses. Use Value: Meets DO-160 Section 22 lightning-induced transient immunity via VCAP-based STORE, avoiding volatile RAM data loss. | Use Scenario: Preserving tariff schedule updates, demand response flags, and tamper-event timestamps in utility smart meters during grid brownouts. IC Role / Device Role / Timing Role: Tamper-resistant memory module retaining billing-critical state across uncontrolled power cycling. Use Value: Achieves IEC 62056-21 compliance for secure metering data persistence without supercapacitor aging concerns. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nvSRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STK12C68-SF35ITR | 45 ns access time; identical pinout, QuantumTrap architecture, and STORE/RECALL functionality | Lower speed grade suitable for cost-sensitive industrial controllers where 25 ns timing margin is unnecessary | Select when system clock budget allows >35 ns read latency and BOM cost reduction is prioritized over maximum throughput |
| AS4C16M16SA-6BIN | Synchronous DDR2 SDRAM with internal self-refresh; no nonvolatile capability; 16 Mbit density; 3.3 V operation | Requires external nonvolatile storage (eMMC/EEPROM) and controller firmware for state persistence | Choose only if migrating to modern low-power architecture with dedicated NVM co-processor and voltage translation |
Compared with STK12C68-SF35ITR, the -SF25ITR offers tighter 25 ns timing for legacy 5 V bus systems, while AS4C16M16SA-6BIN demands full system redesign due to voltage, interface, and persistence architecture incompatibility.
Availability
STK12C68-SF25ITR is available at Aetrix Electronics and suitable for industrial PLC data logging, medical device parameter storage, and avionics black box memory requiring stable component supply and long-term obsolescence support.
Supply support for STK12C68-SF25ITR 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 aerospace applications.
The STK12C68 belongs to Cypress's QuantumTrap nvSRAM product line, engineered specifically for mission-critical systems needing instant, deterministic, and maintenance-free nonvolatile storage without battery or external energy harvesting.
FAQ
What is the minimum VCAP capacitor value required for reliable AutoStore operation?
The STK12C68-SF25ITR requires a minimum 68 µF ±20% tantalum or polymer capacitor rated for 6 V on the VCAP pin. This value ensures sufficient charge to complete the full 10 ms STORE cycle even when VCC drops from 5.0 V to 3.6 V at the maximum specified rate. Using less capacitance risks incomplete STORE and data loss.
Can the HSB pin be left unconnected if hardware STORE is not used?
Yes, the HSB pin may be left unconnected when hardware STORE is unused. The device includes a weak internal pull-up that holds HSB HIGH during normal operation. Leaving it floating does not affect AutoStore or software STORE functionality, but prevents external monitoring of STORE progress or initiation of hardware STORE.
How does the STK12C68 handle concurrent SRAM access during software STORE initiation?
The software STORE sequence (six CE-controlled reads) must execute without interruption. Any intervening read or write access aborts the sequence and cancels STORE initiation. The device does not queue or arbitrate these requests-strict sequential execution is enforced in hardware to prevent partial or corrupted nonvolatile writes.
Is the STK12C68-SF25ITR compatible with 3.3 V systems?
No, the STK12C68-SF25ITR is specified only for 5.0 V ±10% operation. Its internal charge pump, VSWITCH threshold (~3.6 V), and logic thresholds are designed for 5 V rail compatibility. Interfacing with 3.3 V controllers requires level-shifting on all address, data, and control lines, and violates absolute maximum ratings if VCC is reduced below 4.5 V.
STK12C68-SF25ITR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 28-SOIC (0.342", 8.69mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- NVSRAM
- Technology:
- NVSRAM (Non-Volatile SRAM)
- Memory Size:
- 64Kbit
- Memory Organization:
- 8K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 25ns
- Access Time:
- 25 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
STK12C68-SF25ITR FAQ
1.How can I place an order for STK12C68-SF25ITR through Aetrix?
Please submit a Request for Quotation (RFQ) for STK12C68-SF25ITR 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 STK12C68-SF25ITR reliable?
The price and inventory of STK12C68-SF25ITR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK12C68-SF25ITR is usually 5 days.
3.What payment methods are accepted for STK12C68-SF25ITR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK12C68-SF25ITR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK12C68-SF25ITR?
STK12C68-SF25ITR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK12C68-SF25ITR 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 STK12C68-SF25ITR?
For technical support, including STK12C68-SF25ITR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK12C68-SF25ITR requirements.
6.How does Aetrix verify that STK12C68-SF25ITR is sourced from the original manufacturer or authorized distributors?
All STK12C68-SF25ITR 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 STK12C68-SF25ITR meets industry standards.
7.What is the process for return or replacement of STK12C68-SF25ITR?
All STK12C68-SF25ITR units undergo pre-shipment inspection (PSI). If there is an issue with STK12C68-SF25ITR, 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 STK12C68-SF25ITR part is unused and in its original packaging.
Return procedure for STK12C68-SF25ITR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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