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Infineon Technologies STK14C88-3NF35
- Part No.:
- STK14C88-3NF35
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 32-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
STK14C88-3NF35.pdf
- Description:
- IC NVSRAM 256KBIT PAR 32SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,188
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Product details
Overview
STK14C88-3NF35 from Cypress Semiconductor is a 256 Kbit (32K × 8) nonvolatile static RAM with integrated QuantumTrap technology, delivering automatic STORE on power loss and automatic RECALL on power-up. It operates from a single 3.3V ±0.3V supply, features 35 ns access time, 100-year data retention, and supports unlimited SRAM read/write cycles. Used in industrial control systems requiring persistent memory without external backup.
For engineers reviewing the STK14C88-3NF35 datasheet, STK14C88-3NF35 pinout, STK14C88-3NF35 application, or STK14C88-3NF35 equivalent, key selection criteria include AutoStore timing behavior, VCAP capacitor sizing (68–220 µF), HSB-driven hardware synchronization, and software STORE/RECALL address sequence integrity.
Technical Context
The STK14C88-3NF35 integrates a standard fast SRAM array (512 × 512) with parallel-connected QuantumTrap nonvolatile cells per bit. STORE and RECALL execute atomically across all 32,768 bytes, with SRAM access inhibited during both operations.
It implements three STORE initiation modes: automatic (triggered by VCC drop below VSWITCH), hardware (via HSB pin assertion), and software (six-address CE-controlled READ sequence). RECALL occurs automatically at power-up or via identical six-address software sequence - with no degradation to nonvolatile cell endurance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32K × 8): Provides byte-wide interface for legacy microcontroller buses without address multiplexing. |
| Access Time | 35 ns: Enables direct replacement of standard SRAMs in 25 MHz bus systems with no wait-state insertion. |
| Data Retention | 100 years: Guarantees nonvolatile data survival over full product lifecycle without refresh or power. |
| STORE Endurance | 1,000,000 cycles: Limits field-replaceable unit (FRU) design lifetime only by power-loss event count, not usage frequency. |
| VCAP Requirement | 68–220 µF, 4.7V-rated: Defines minimum external capacitor size needed to complete one STORE under worst-case VCC droop rate. |
| Operating Voltage | 3.3V ±0.3V: Matches LVTTL and 3.3V logic families; eliminates need for level-shifting in modern embedded designs. |
| Temperature Range | Industrial (–40°C to +85°C): Supports deployment in uncontrolled environments such as factory-floor PLCs and remote telemetry units. |
Pinout & Package
STK14C88-3NF35 is packaged in a 32-pin SOIC (300-mil width), pin-compatible with industry-standard 32-pin nvSRAM footprints. The package supports surface-mount reflow and manual soldering with JEDEC-standard thermal profile compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Input | 15-bit address bus supporting full 32K-byte addressing; no address latch required. |
| DQ0–DQ7 | Bidirectional Data I/O | True 8-bit data bus shared for read and write; tristates when OE HIGH or during STORE/RECALL. |
| CE, OE, WE | Control Inputs | Standard SRAM control set (chip enable, output enable, write enable); all active-low, TTL-compatible thresholds. |
| HSB | Hardware Store Busy | Open-drain status/output pin: driven LOW during STORE; pulled LOW externally to initiate hardware STORE. |
| VCAP | AutoStore Capacitor Terminal | Connects to external storage capacitor; supplies energy for STORE operation when VCC fails. |
| VCC / VSS | Power / Ground | Single 3.3V supply rail; ground reference common to all logic and analog circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| QuantumTrap Nonvolatile Cell | Enables bit-level nonvolatility without external EEPROM or battery, eliminating BOM cost and reliability risk. |
| AutoStore on Power Loss | Guarantees data persistence without host intervention-critical for black-box logging in power-unstable environments. |
| Software STORE/RECALL Sequence | Allows deterministic, debuggable nonvolatile operations via standard memory reads-no special command protocol or registers. |
| HSB Synchronization | Permits coordinated STORE across multiple nvSRAMs using shared VCAP and daisy-chained HSB, reducing system-level capacitor count. |
| Unlimited RECALL Cycles | Supports frequent firmware reload or configuration restore without wearing out nonvolatile storage. |
Applications
| Industrial PLC Data Logging | Medical Device Event Buffering |
|---|---|
Use Scenario: Captures sensor readings and fault timestamps during mains power interruption in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile SRAM acting as last-known-state buffer with zero-latency recall at boot. Use Value: Eliminates need for supercapacitor-based backup power circuits while maintaining full 32K-byte context across unexpected shutdowns. | Use Scenario: Stores critical diagnostic events (e.g., ECG anomaly detection, alarm triggers) in portable patient monitors. IC Role / Device Role / Timing Role: Persistent memory node synchronized to host MCU's power domain, retaining data through battery swaps. Use Value: Ensures regulatory-compliant audit trail continuity without external NV memory or firmware overhead for wear leveling. |
| Avionics Power-Up Configuration | Telecom Line Card State Preservation |
Use Scenario: Holds flight-control parameter defaults and calibration offsets that must be restored within 100 ms of aircraft power application. IC Role / Device Role / Timing Role: Fast-recall memory providing deterministic tHRECALL ≤ 15 ms after VCC exceeds VSWITCH. Use Value: Meets DO-160 Section 20 transient immunity requirements by avoiding reliance on slow-booting flash or external controllers. | Use Scenario: Maintains port mapping, VLAN settings, and link state across hot-swap events in carrier-grade Ethernet line cards. IC Role / Device Role / Timing Role: Dual-role memory: volatile SRAM during operation, nonvolatile archive during module removal. Use Value: Enables true "plug-and-play" replacement with zero service interruption-configuration survives physical disconnection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STK14CA8-3AF35 | Same architecture but rated for extended temperature (–40°C to +105°C); uses 32-pin TSSOP package. | Suitable for under-hood automotive or high-ambient telecom equipment where SOIC thermal performance is insufficient. | Select when ambient operating temperature exceeds +85°C or board space requires smaller footprint. |
| FM24CL64-G | F-RAM-based (64 Kbit), 3.3V, 55 ns access; no VCAP capacitor or STORE timing constraints. | Lacks AutoStore autonomy-requires explicit host-initiated write for persistence; better for burst-write logging. | Select when deterministic low-power writes dominate over power-loss resilience, or when capacitor placement is mechanically constrained. |
Compared with STK14CA8-3AF35, the STK14C88-3NF35 offers lower-cost industrial-temperature operation in SOIC; compared with FM24CL64-G, it delivers guaranteed power-loss STORE without host coordination-but requires careful VCAP layout and timing validation.
Availability
STK14C88-3NF35 is available at Aetrix Electronics and suitable for industrial PLC data logging, medical device event buffering, and avionics power-up configuration requiring stable component supply and long-term obsolescence support.
Supply support for STK14C88-3NF35 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 U.S.-based semiconductor company specializing in memory, microcontrollers, and programmable solutions for industrial, automotive, and communications markets.
The STK14C88-3NF35 belongs to Cypress's nvSRAM product line, designed specifically to replace battery-backed SRAM in mission-critical systems where maintenance-free, long-life nonvolatility is mandatory.
FAQ
What is the minimum VCAP capacitor value required for reliable AutoStore operation?
The STK14C88-3NF35 requires a minimum 68 µF, +20% tolerance, 4.7V-rated capacitor on the VCAP pin to guarantee successful STORE under worst-case VCC droop conditions (20 µs/V). Values up to 220 µF are supported for extended hold-up time or multi-device sharing.
Can the HSB pin be left unconnected if hardware STORE is not used?
Yes - the HSB pin has an internal weak pull-up and may be left floating if hardware STORE and busy indication are unused. No external resistor is required unless HSB is actively driven or used as an open-drain output for multi-device synchronization.
Does software STORE require the device to be in a specific state before initiation?
Yes - the six-address software STORE sequence must begin immediately after a valid SRAM write operation and must not be interrupted by any other memory access. If a write hasn't occurred since the last STORE or RECALL, the sequence is ignored unless AutoStore Inhibit mode is enabled.
Is the STK14C88-3NF35 compatible with 5V-tolerant microcontrollers?
No - the STK14C88-3NF35 is strictly a 3.3V-only device with absolute maximum VCC of 3.6V. Interfacing with 5V systems requires level translation on all address, data, and control lines; direct connection risks permanent damage to input buffers.
STK14C88-3NF35 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 32-SOIC (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:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 35ns
- Access Time:
- 35 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-SOIC
STK14C88-3NF35 FAQ
1.How can I place an order for STK14C88-3NF35 through Aetrix?
Please submit a Request for Quotation (RFQ) for STK14C88-3NF35 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 STK14C88-3NF35 reliable?
The price and inventory of STK14C88-3NF35 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK14C88-3NF35 is usually 5 days.
3.What payment methods are accepted for STK14C88-3NF35?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK14C88-3NF35 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK14C88-3NF35?
STK14C88-3NF35 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK14C88-3NF35 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 STK14C88-3NF35?
For technical support, including STK14C88-3NF35 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK14C88-3NF35 requirements.
6.How does Aetrix verify that STK14C88-3NF35 is sourced from the original manufacturer or authorized distributors?
All STK14C88-3NF35 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 STK14C88-3NF35 meets industry standards.
7.What is the process for return or replacement of STK14C88-3NF35?
All STK14C88-3NF35 units undergo pre-shipment inspection (PSI). If there is an issue with STK14C88-3NF35, 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 STK14C88-3NF35 part is unused and in its original packaging.
Return procedure for STK14C88-3NF35:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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