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Infineon Technologies STK12C68-PF25I
- Part No.:
- STK12C68-PF25I
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-DIP (0.300", 7.62mm)
- Datasheet:
-
STK12C68-PF25I.pdf
- Description:
- IC NVSRAM 64KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,361
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Product details
Overview
STK12C68-PF25I from Cypress Semiconductor is a 64 Kbit (8 K × 8) nonvolatile static RAM with QuantumTrap technology, delivering 25 ns access time, AutoStore on power-down using an external 68 µF 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-PF25I datasheet, STK12C68-PF25I pinout, STK12C68-PF25I application, or STK12C68-PF25I equivalent, key selection criteria include AutoStore timing behavior, HSB pin handshake logic, VCAP capacitor sizing, and compatibility with legacy 28-pin SOIC-based embedded controllers.
Technical Context
The STK12C68-PF25I integrates a standard 8 K × 8 SRAM array with parallel-coupled QuantumTrap nonvolatile storage cells, enabling simultaneous STORE/RECALL of all 8,192 bytes. Its architecture separates volatile and nonvolatile data paths, with dedicated charge-pump circuitry driving VCAP to sustain STORE during VCC collapse.
STORE is triggered by power loss (AutoStore), HSB assertion, or six-address software sequence; RECALL occurs automatically at power-up or via identical six-address sequence ending in 0x0F0E. The device inhibits STORE unless at least one SRAM write has occurred since last STORE/RECALL, preventing spurious nonvolatile writes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8 K × 8), directly addressable via A0–A12 and bidirectional DQ0–DQ7 I/O |
| Access Time | 25 ns - defines maximum clock-to-data valid delay for CE/OE-controlled reads in high-speed control loops |
| STORE Endurance | 1,000,000 cycles - limits total nonvolatile write operations over product lifetime |
| Data Retention | 100 years - guaranteed nonvolatile data hold time at industrial temperature range (−40°C to +85°C) |
| VCAP Capacitor | 68 µF ±20% - minimum external capacitor required to supply energy for full STORE operation during VCC dropout |
| Supply Voltage | 5 V ±10% - single-rail operation compatible with legacy 5 V logic systems; no 3.3 V support |
| Operating Temp | −40°C to +85°C - validated for industrial environments including PLCs and motor drives |
Pinout & Package
STK12C68-PF25I is housed in a 28-pin, 300-mil wide plastic dual in-line package (PDIP), with 0.1-inch lead pitch and through-hole mounting. Pin layout follows JEDEC MS-026 standard for 28-pin DIP devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Input | 13-bit address bus selecting one of 8,192 memory locations; latched on CE transition |
| DQ0–DQ7 | Bidirectional Data I/O | Common data bus for SRAM reads/writes and software STORE/RECALL address sequences |
| WE | Write Enable (Active LOW) | Controls write gating; must be held HIGH during STORE/RECALL to avoid bus contention |
| CE | Chip Enable (Active LOW) | Primary chip select; used to initiate software STORE/RECALL via address sequences |
| OE | Output Enable (Active LOW) | Enables SRAM output drivers; tristates DQ lines when HIGH during writes or STORE |
| HSB | Hardware Store Busy | Open-drain status signal: LOW during any STORE (AutoStore, hardware, or software); also initiates STORE when pulled LOW externally |
| VCAP | AutoStore Capacitor Supply | Internal charge-pump output node; requires 68 µF capacitor to sustain STORE under VCC dropout |
| VCC | Power Supply | +5 V ±10% main supply; powers SRAM core and internal logic; disconnects from VCAP at VSWITCH (~3.6 V) |
| VSS | Ground | System reference ground; must be low-impedance connection to minimize STORE timing jitter |
Key Features
| Feature | Design Value |
|---|---|
| AutoStore on Power-Down | Eliminates need for external battery or supercapacitor backup; uses internal charge pump and external 68 µF capacitor |
| Software STORE/RECALL | 6-address CE-controlled read sequence enables deterministic, non-disruptive nonvolatile operations without hardware changes |
| Hardware STORE Trigger | HSB pin provides both initiation and real-time busy indication, enabling system-level coordination of critical STORE events |
| Write-Conditioned STORE | AutoStore and HSB-initiated STORE are suppressed unless at least one SRAM write occurred since last STORE/RECALL - prevents unnecessary wear |
| QuantumTrap Nonvolatile Cell | Enables 100-year data retention and 1M STORE endurance while co-locating with SRAM in same physical cell |
Applications
| Industrial PLC Data Logging | Medical Device Parameter Storage |
|---|---|
Use Scenario: Storing runtime configuration, calibration offsets, and fault logs in programmable logic controllers during unexpected AC loss. IC Role / Device Role / Timing Role: Nonvolatile SRAM providing immediate data persistence without battery management circuitry or firmware overhead. Use Value: Guarantees zero-data-loss recall within 10 ms after power restoration, meeting IEC 61131-2 cycle-time constraints. | Use Scenario: Retaining patient-specific therapy settings and treatment history across power cycles in infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Fail-safe memory element ensuring regulatory-compliant data integrity during mains failure or battery swap. Use Value: Meets FDA 21 CFR Part 11 requirements for audit-trail persistence with 100-year retention and no wear-out mechanism. |
| Avionics Black Box Buffer | Energy Meter Firmware State Save |
Use Scenario: Capturing flight-critical sensor snapshots and control commands in aircraft data acquisition units prior to emergency shutdown. IC Role / Device Role / Timing Role: High-reliability nvSRAM acting as last-resort buffer before crash-induced power loss. Use Value: Delivers deterministic 25 ns read access and sub-10 ms STORE completion, satisfying DO-160 Section 22 transient immunity requirements. | Use Scenario: Preserving tariff schedules, billing counters, and communication state in smart electricity meters during grid brownouts. IC Role / Device Role / Timing Role: Self-contained nonvolatile memory eliminating external EEPROM wear leveling and write latency. Use Value: Enables >10,000 daily STORE cycles over 15-year field life without degradation, exceeding ANSI C12.20 accuracy standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STK12C68-CF25I | Same die, commercial temperature range (0°C to +70°C); identical pinout, timing, and STORE logic | Suitable only for non-industrial environments; lacks extended temp validation and thermal derating data | Select only if operating ambient stays within 0–70°C and industrial qualification is not required |
| FM16W08-SG | 4 Mbit F-RAM with 15 ns access, no VCAP capacitor, unlimited endurance, but requires 3.3 V supply and different software protocol | Eliminates capacitor and charge-pump complexity but mandates voltage rail redesign and firmware rewrite | Choose for new designs needing higher density and zero STORE wear-out; not drop-in replaceable |
Compared with STK12C68-CF25I, the -PF25I offers verified operation at −40°C to +85°C and extended reliability testing; versus FM16W08-SG, it retains 5 V compatibility and legacy software flow but trades off endurance and capacitor-free operation.
Availability
STK12C68-PF25I is available at Aetrix Electronics and suitable for industrial PLCs, medical infusion pumps, and avionics data recorders requiring stable component supply with long-term lifecycle assurance.
Supply support for STK12C68-PF25I 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 programmable solutions for industrial, automotive, and consumer markets.
The STK12C68 belongs to Cypress's QuantumTrap nvSRAM product line, designed specifically for mission-critical applications where battery-backed SRAM is impractical and EEPROM/Flash write latency or endurance is insufficient.
FAQ
What is the minimum VCAP capacitor value required for reliable AutoStore operation?
The STK12C68-PF25I requires a minimum 68 µF ±20% tantalum or low-ESR electrolytic capacitor rated for ≥6 V on the VCAP pin. This value ensures sufficient stored energy to complete the full 10 ms STORE cycle when VCC drops below VSWITCH (~3.6 V). Using less capacitance risks incomplete STORE and data corruption; values up to 220 µF are supported but offer no functional benefit.
Can STK12C68-PF25I be operated without the VCAP capacitor?
Yes - in AutoStore Inhibit mode, VCC is tied to ground and +5 V is applied directly to VCAP, disabling automatic power-loss STORE. In this configuration, STORE must be initiated exclusively via software sequence or HSB assertion. However, this mode forfeits hands-off data protection during unexpected power loss and is only appropriate for controlled shutdown scenarios.
How does the STK12C68-PF25I prevent spurious STORE operations during brownout conditions?
The device incorporates voltage monitoring that disables AutoStore and HSB-triggered STORE when VCC falls below VSWITCH (~3.6 V), and further inhibits STORE unless at least one SRAM write has occurred since the last STORE or RECALL. This dual safeguard prevents wear on QuantumTrap cells during marginal supply conditions and eliminates false triggers from noise or slow power ramps.
Is the HSB pin mandatory for system integration?
No - the HSB pin is optional. If unused, it may be left unconnected, as it features an internal weak pull-up. However, connecting HSB to a GPIO allows the host system to detect STORE progress and synchronize critical tasks (e.g., disabling interrupts or halting DMA) during nonvolatile write cycles, improving determinism in real-time applications.
STK12C68-PF25I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 28-DIP (0.300", 7.62mm)
- 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:
- 25ns
- Access Time:
- 25 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 28-PDIP
STK12C68-PF25I FAQ
1.How can I place an order for STK12C68-PF25I through Aetrix?
Please submit a Request for Quotation (RFQ) for STK12C68-PF25I 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-PF25I reliable?
The price and inventory of STK12C68-PF25I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK12C68-PF25I is usually 5 days.
3.What payment methods are accepted for STK12C68-PF25I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK12C68-PF25I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK12C68-PF25I?
STK12C68-PF25I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK12C68-PF25I 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-PF25I?
For technical support, including STK12C68-PF25I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK12C68-PF25I requirements.
6.How does Aetrix verify that STK12C68-PF25I is sourced from the original manufacturer or authorized distributors?
All STK12C68-PF25I 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-PF25I meets industry standards.
7.What is the process for return or replacement of STK12C68-PF25I?
All STK12C68-PF25I units undergo pre-shipment inspection (PSI). If there is an issue with STK12C68-PF25I, 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-PF25I part is unused and in its original packaging.
Return procedure for STK12C68-PF25I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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