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Infineon Technologies STK12C68-WF45
- Part No.:
- STK12C68-WF45
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
STK12C68-WF45.pdf
- Description:
- IC NVSRAM 64KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,802
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Product details
Overview
STK12C68-WF45 from Cypress Semiconductor is a 64 Kbit (8 K × 8) nonvolatile static RAM with QuantumTrap technology, delivering 45 ns access time, AutoStore on power-down using an external 68 µF capacitor, and software/hardware-controlled STORE/RECALL operations. It operates at single 5 V ±10%, supports unlimited SRAM read/write cycles, and retains data for 100 years in nonvolatile cells - deployed in industrial control systems requiring persistent memory without battery backup.
For engineers reviewing the STK12C68-WF45 datasheet, STK12C68-WF45 pinout, STK12C68-WF45 application, or STK12C68-WF45 equivalent, key selection considerations include AutoStore timing dependency on VCAP capacitance, HSB-driven hardware STORE arbitration, software address-sequence initiation, and compatibility with legacy 28-pin SOIC footprint designs.
Technical Context
The STK12C68-WF45 integrates parallel SRAM and QuantumTrap nonvolatile storage per cell, enabling simultaneous STORE (SRAM → NV) and RECALL (NV → SRAM) across all 8,192 bytes. Its architecture uses internal charge-pump regulation to drive VCAP to 5 V and initiates AutoStore when VCC drops below VSWITCH (~3.6 V), sustaining operation for ≥10 ms via stored capacitor energy.
STORE is conditional: hardware or AutoStore only executes if at least one SRAM write occurred since last STORE/RECALL; software STORE bypasses this condition. The HSB pin serves dual role - input to trigger STORE and open-drain output signaling active STORE duration (tSTORE = 10 ms typical), during which all I/O is disabled and SRAM access inhibited.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8 K × 8), directly addressable via A0–A12 for byte-level access in embedded control registers. |
| Access Time | 45 ns - defines maximum clock-to-data valid delay in high-speed microcontroller interface timing budgets. |
| Nonvolatile Endurance | 1,000,000 STORE cycles - sets lifetime limit for frequent power-loss logging in programmable logic controllers. |
| Data Retention | 100 years at T ≤ 85°C - ensures firmware/state persistence across product lifecycle without refresh or battery. |
| VCAP Requirement | 68 µF ±20%, 6 V rated - minimum capacitance enabling guaranteed 10 ms STORE under worst-case VCC droop profile. |
| Supply Voltage | 5 V ±10% - mandates compatible LDO or regulator design; no 3.3 V operation supported. |
| Operating Temperature | Industrial range (−40°C to +85°C) - validated for deployment in motor drives and factory automation enclosures. |
Pinout & Package
STK12C68-WF45 is packaged in a 28-pin SOIC (330 mil width), pin-compatible with industry-standard nvSRAM footprints. The package supports surface-mount reflow and manual soldering with JEDEC MS-012AC compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Input | 13-bit address bus selecting one of 8,192 memory locations; must be stable before CE/WE assertion. |
| DQ0–DQ7 | Bidirectional Data I/O | 8-bit shared data path; tristated when OE HIGH or during STORE/RECALL to prevent bus contention. |
| CE (E) | Chip Enable | Active-low chip select; controls device activation and enables CE-triggered software STORE/RECALL sequences. |
| WE (W) | Write Enable | Active-low write strobe; must remain HIGH during STORE/RECALL to avoid corruption; pulled up externally at power-up. |
| OE (G) | Output Enable | Active-low output driver control; disables outputs during writes to isolate data bus. |
| HSB | Hardware Store Busy | Open-drain status/output pin: driven LOW during any STORE; pulled LOW externally to initiate hardware STORE. |
| VCAP | AutoStore Capacitor Supply | Internal charge-pump output node; requires external 68 µF capacitor to sustain STORE during VCC collapse. |
| VCC | Power Supply | +5 V ±10% main supply; powers SRAM core and charge pump; drops below VSWITCH (~3.6 V) triggers AutoStore. |
| VSS | Ground | System reference ground; must be low-impedance connection to minimize noise coupling into STORE timing. |
Key Features
| Feature | Design Value |
|---|---|
| AutoStore on Power-Down | Eliminates need for external battery or supercapacitor management circuitry; triggered autonomously when VCC falls below VSWITCH. |
| Software STORE/RECALL | Uses 6-address CE-read sequence (0x0000→0x0F0F for STORE); enables deterministic, non-interruptible state capture in real-time OS contexts. |
| Hardware STORE via HSB | Allows system-level control of STORE timing independent of software state; HSB output signals busy duration for precise scheduler coordination. |
| QuantumTrap Nonvolatile Cell | Enables 100-year data retention and 1M STORE endurance without wear leveling or ECC overhead - simplifies firmware design. |
| Unlimited SRAM Read/Write Cycles | Preserves full SRAM performance characteristics (45 ns access, no refresh) while adding nonvolatility - no speed penalty during normal operation. |
Applications
| Industrial PLC Data Logging | Medical Device Configuration Storage |
|---|---|
Use Scenario: Capturing runtime parameters (e.g., sensor calibration offsets, alarm thresholds) during unexpected AC mains loss in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile SRAM providing atomic STORE on VCC collapse, synchronized to internal charge-pump discharge from VCAP. Use Value: Guarantees zero-data-loss state preservation without battery replacement or external supervisor ICs. | Use Scenario: Storing FDA-mandated device configuration history (e.g., dose settings, user permissions) across power cycles in infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: High-reliability memory with 100-year retention, supporting audit-trail logging via software STORE sequence. Use Value: Meets regulatory data integrity requirements without periodic refresh or backup power validation. |
| Telecom Base Station Control Registers | Automotive Body Control Module EEPROM Replacement |
Use Scenario: Maintaining RF channel tuning tables and fan control profiles during brief brownouts in outdoor telecom cabinets. IC Role / Device Role / Timing Role: Fast-access (45 ns) nvSRAM enabling immediate RECALL at power-up to restore operational state within <100 ms. Use Value: Reduces system boot latency versus serial EEPROM while eliminating write-cycle delays. | Use Scenario: Replacing discrete EEPROM in body control modules for seat position memory, mirror presets, and lighting profiles. IC Role / Device Role / Timing Role: Pin-compatible drop-in alternative to legacy EEPROMs, leveraging existing 28-pin SOIC layout and 5 V bus. Use Value: Enables byte-level random writes at SRAM speed, avoiding 5–10 ms page-write blocking typical of EEPROM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STK12C68-WF35 | 35 ns access time; identical pinout, QuantumTrap architecture, and STORE/RECALL functionality. | Higher-speed interface required; suitable where tAA < 45 ns is mandated by host controller timing. | Select when system timing margin is constrained and 35 ns reduces setup/hold violations. |
| AS12C68-45 | Same 45 ns speed and 64 Kbit density but uses Asynchronous SRAM + separate EEPROM die; no integrated AutoStore or VCAP support. | Lacks autonomous power-loss STORE; requires external power-fail detection and firmware-managed EEPROM writes. | Choose only if QuantumTrap reliability is not required and BOM cost reduction outweighs design complexity. |
Compared with STK12C68-WF45, the WF35 offers tighter timing for high-frequency bus interfaces, while the AS12C68-45 sacrifices integrated nonvolatility for lower unit cost - making STK12C68-WF45 optimal for safety-critical or maintenance-free deployments.
Availability
STK12C68-WF45 is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, and telecom infrastructure requiring stable component supply with long-term obsolescence mitigation.
Supply support for STK12C68-WF45 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, PSoC, and USB solutions for embedded systems.
The STK12C68 belongs to Cypress's QuantumTrap nvSRAM product line, engineered for applications demanding instant-on nonvolatility, deterministic STORE/RECALL, and elimination of battery-based backup in harsh environments.
FAQ
What is the minimum VCAP capacitance required for reliable AutoStore operation?
The STK12C68-WF45 requires a minimum 68 µF ±20%, 6 V rated capacitor on the VCAP pin to guarantee successful STORE during VCC collapse. Lower values risk incomplete STORE due to insufficient energy; values above 220 µF may extend STORE time beyond specification limits and cause timing conflicts with system power sequencing.
Can STK12C68-WF45 operate at 3.3 V?
No. The STK12C68-WF45 is specified exclusively for 5 V ±10% operation (4.5 V to 5.5 V). It lacks internal level-shifting or 3.3 V logic compatibility. Attempting 3.3 V operation results in failure to charge VCAP, disable AutoStore, and corrupt STORE/RECALL timing - confirmed in DC Electrical Characteristics (VCC = 4.5 V min).
How does the HSB pin behave during software-initiated STORE?
During software STORE, the HSB pin is driven LOW by the device for the full tSTORE duration (10 ms typical), identical to hardware or AutoStore. This provides consistent busy signaling regardless of initiation method, enabling unified interrupt or polling logic in host firmware without mode-dependent handling.
Is STK12C68-WF45 recommended for new designs?
No - Cypress explicitly marks STK12C68 as "Not Recommended for New Designs" in its official documentation (Rev. *H, Nov 2014). While fully functional and supported for legacy repair and continuity, new designs should evaluate Infineon's newer nvSRAM families (e.g., CY14B108L) offering enhanced density, lower voltage, and extended lifecycle support.
STK12C68-WF45 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- 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:
- 45ns
- Access Time:
- 45 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 28-PDIP
STK12C68-WF45 FAQ
1.How can I place an order for STK12C68-WF45 through Aetrix?
Please submit a Request for Quotation (RFQ) for STK12C68-WF45 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-WF45 reliable?
The price and inventory of STK12C68-WF45 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK12C68-WF45 is usually 5 days.
3.What payment methods are accepted for STK12C68-WF45?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK12C68-WF45 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK12C68-WF45?
STK12C68-WF45 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK12C68-WF45 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-WF45?
For technical support, including STK12C68-WF45 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK12C68-WF45 requirements.
6.How does Aetrix verify that STK12C68-WF45 is sourced from the original manufacturer or authorized distributors?
All STK12C68-WF45 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-WF45 meets industry standards.
7.What is the process for return or replacement of STK12C68-WF45?
All STK12C68-WF45 units undergo pre-shipment inspection (PSI). If there is an issue with STK12C68-WF45, 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-WF45 part is unused and in its original packaging.
Return procedure for STK12C68-WF45:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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