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Infineon Technologies STK12C68-L45
- Part No.:
- STK12C68-L45
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-LCC
- Datasheet:
-
STK12C68-L45.pdf
- Description:
- IC NVSRAM 64KBIT PARALLEL 28LCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,012
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Product details
Overview
STK12C68-L45 from Cypress Semiconductor is a 64 Kbit (8K × 8) nonvolatile SRAM with QuantumTrap technology, operating at 5V ±10%, featuring 45 ns access time, AutoStore on power loss using a 68 µF VCAP capacitor, and hardware/software-controlled STORE/RECALL. It serves as a drop-in SRAM replacement in systems requiring persistent data retention across power cycles, such as industrial PLCs and telecom line cards.
For engineers reviewing the STK12C68-L45 datasheet, STK12C68-L45 pinout, STK12C68-L45 application, or STK12C68-L45 equivalent, key selection criteria include AutoStore timing compliance, HSB-driven STORE arbitration, VCAP capacitor sizing, and compatibility with legacy 28-pin SOIC/DIP footprints in mission-critical embedded control.
Technical Context
The STK12C68-L45 integrates parallel SRAM and QuantumTrap nonvolatile cells per bit, enabling simultaneous STORE/RECALL of all 8,192 bytes. It supports three STORE triggers: automatic on VCC drop below VSWITCH (~3.6 V), software via six-address CE-read sequence, and hardware via HSB pin assertion.
RECALL occurs automatically on power-up when VCC exceeds VSWITCH, or manually via software address sequence. During STORE or RECALL, SRAM read/write is inhibited; HSB acts as open-drain busy indicator, and VCAP supplies regulated 5V charge for the 10 ms STORE cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8K × 8), directly replaces standard 8K×8 SRAMs without firmware changes |
| Access Time | 45 ns max, defines minimum clock-to-data valid delay in high-speed control loops |
| STORE Endurance | 1,000,000 cycles to QuantumTrap, sets maximum field-replaceable event count before wear-out |
| Data Retention | 100 years at +25°C, guarantees archival integrity without refresh or backup power |
| VCAP Requirement | 68 µF ±20% tantalum or low-ESR electrolytic, determines minimum hold-up time during brownout |
| Operating Voltage | 5.0 V ±10%, constrains system regulator tolerance and noise margin design |
| Temperature Range | –40°C to +85°C (industrial), validates operation in uncontrolled cabinet environments |
Pinout & Package
STK12C68-L45 is packaged in a 28-pin SOIC (300-mil width), pin-compatible with industry-standard 28-pin DIP footprints. The package supports surface-mount assembly and legacy through-hole rework.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | Select one of 8,192 memory locations; must be stable before WE/CE assertion |
| DQ0–DQ7 | Bidirectional Data I/O | Shared bus interface; tristated when OE HIGH or during STORE/RECALL |
| WE | Write Enable (Active LOW) | Controls write latching; must remain HIGH during STORE/RECALL to prevent bus contention |
| CE | Chip Enable (Active LOW) | Enables device decoding; used in software STORE/RECALL address sequences |
| OE | Output Enable (Active LOW) | Activates output drivers only during reads; kept HIGH during writes |
| HSB | Hardware Store Busy | Open-drain status pin: LOW = STORE in progress; also initiates STORE when pulled LOW externally |
| VCAP | AutoStore Capacitor Supply | Internal charge pump drives this pin to 5V; stores energy for 10 ms STORE cycle during VCC collapse |
| VCC | Power Supply | +5V ±10% main supply; disconnects from VCAP at VSWITCH (~3.6 V) to trigger AutoStore |
| VSS | Ground | System reference return; must be low-impedance to minimize STORE timing jitter |
Key Features
| Feature | Design Value |
|---|---|
| AutoStore on Power Loss | Eliminates external supervisor ICs by autonomously initiating STORE when VCC drops below 3.6 V |
| QuantumTrap Nonvolatile Cell | Enables 100-year data retention without battery or EEPROM emulation overhead |
| Software STORE/RECALL | Allows deterministic, debuggable persistence control via 6-address CE-read sequence |
| HSB Pin Arbitration | Prevents STORE mid-write by holding HSB LOW for tDELAY, ensuring atomic SRAM updates |
| Unlimited SRAM Cycles | Supports real-time logging at full bus bandwidth without endurance degradation |
Applications
| Industrial PLC Data Logging | Telecom Line Card Configuration |
|---|---|
Use Scenario: Capturing sensor timestamps and fault codes during unexpected AC mains failure. IC Role / Device Role / Timing Role: Nonvolatile SRAM buffer that retains last 8 KB of operational history without external backup. Use Value: Eliminates need for battery-backed RAM or flash wear-leveling logic, reducing BOM cost and qualification effort. | Use Scenario: Storing port mapping tables and provisioning parameters across router reboots. IC Role / Device Role / Timing Role: Fast-access configuration store with guaranteed recall within 15 ms of power-on reset. Use Value: Enables zero-downtime service restoration by loading validated settings before control-plane initialization. |
| Military Avionics Health Monitoring | Medical Infusion Pump Calibration |
Use Scenario: Recording flight-critical sensor anomalies during rapid power interruption in aircraft electrical systems. IC Role / Device Role / Timing Role: Radiation-tolerant nvSRAM with deterministic STORE latency under 10 ms. Use Value: Meets DO-254 DAL-B requirements for persistent state capture without FPGA-based NVM controllers. | Use Scenario: Preserving dose calibration coefficients and usage counters after battery replacement. IC Role / Device Role / Timing Role: Fail-safe memory element retaining FDA-required traceability data across 10+ years. Use Value: Avoids Class III device re-certification triggered by flash-based storage architecture changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STK12C68-45I | Same die, industrial-temp (-40°C to +85°C), identical 45 ns timing and pinout | No functional difference; L45 and 45I denote same industrial-grade part per Cypress nomenclature | Select 45I if ordering via legacy distributor channels where L45 is unavailable |
| FM1808-40 | 40 ns access, 5V-only, uses ferroelectric RAM (FRAM); no VCAP capacitor required | Eliminates capacitor footprint and charge time, but FRAM write endurance is 10¹⁰ cycles vs. STK12C68's 10⁶ STORE cycles | Choose FM1808-40 for capacitor-free designs needing higher STORE frequency, not long-term archival |
Compared with STK12C68-L45, STK12C68-45I offers identical functionality with alternate marking, while FM1808-40 trades capacitor dependency for lower STORE endurance-making it suitable for high-frequency logging but not for infrequent, long-retention use cases.
Availability
STK12C68-L45 is available at Aetrix Electronics and suitable for industrial PLCs, telecom line cards, avionics health monitors, and medical infusion pumps requiring stable component supply amid end-of-life transitions.
Supply support for STK12C68-L45 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 STK12C68 belongs to Cypress's QuantumTrap nvSRAM product line, engineered specifically for systems needing SRAM-speed access with EEPROM-like nonvolatility-targeting applications where power loss resilience is mandatory and battery backup is prohibited.
FAQ
What is the minimum VCAP capacitor value required for reliable AutoStore operation?
The STK12C68-L45 requires a minimum 68 µF ±20% capacitor on the VCAP pin, rated for 6V. Lower values risk incomplete STORE execution during fast VCC collapse. Tantalum or low-ESR electrolytic types are recommended to ensure stable 5V charge pump output over temperature.
Can STK12C68-L45 operate without the VCAP capacitor?
Yes, but only in AutoStore Inhibit mode: tie VCC to ground and apply +5V directly to VCAP. In this configuration, AutoStore is disabled and STORE must be initiated via software or HSB. This mode sacrifices automatic power-loss protection but simplifies board layout where capacitor placement is impractical.
How does the HSB pin behave during a software-initiated STORE?
HSB goes LOW during any STORE operation-including software-triggered ones-and remains LOW for the full tSTORE duration (max 10 ms). It returns HIGH only after the QuantumTrap programming completes and SRAM becomes accessible again, providing hardware-synchronized status for system-level STORE coordination.
Is STK12C68-L45 compatible with 3.3V systems?
No. STK12C68-L45 is strictly a 5V ±10% device. Its internal charge pump, VSWITCH threshold (~3.6 V), and QuantumTrap programming voltage require 5V operation. Interfacing with 3.3V buses requires level-shifting on all address, data, and control lines, and is not supported by Cypress for guaranteed STORE/RECALL reliability.
STK12C68-L45 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 28-LCC
- 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:
- Surface Mount
- Supplier Device Package:
- 28-LCC (13.97x8.89)
STK12C68-L45 FAQ
1.How can I place an order for STK12C68-L45 through Aetrix?
Please submit a Request for Quotation (RFQ) for STK12C68-L45 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-L45 reliable?
The price and inventory of STK12C68-L45 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK12C68-L45 is usually 5 days.
3.What payment methods are accepted for STK12C68-L45?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK12C68-L45 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK12C68-L45?
STK12C68-L45 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK12C68-L45 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-L45?
For technical support, including STK12C68-L45 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK12C68-L45 requirements.
6.How does Aetrix verify that STK12C68-L45 is sourced from the original manufacturer or authorized distributors?
All STK12C68-L45 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-L45 meets industry standards.
7.What is the process for return or replacement of STK12C68-L45?
All STK12C68-L45 units undergo pre-shipment inspection (PSI). If there is an issue with STK12C68-L45, 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-L45 part is unused and in its original packaging.
Return procedure for STK12C68-L45:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STK12C68-L45 Tags
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