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Infineon Technologies STK14C88-3NF45TR
- Part No.:
- STK14C88-3NF45TR
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 32-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
STK14C88-3NF45TR.pdf
- Description:
- IC NVSRAM 256KBIT PAR 32SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,735
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Product details
Overview
STK14C88-3NF45TR from Cypress Semiconductor is a 256 Kbit (32K × 8) nonvolatile SRAM with AutoStore functionality, QuantumTrap nonvolatile cell architecture, 45 ns access time, single 3.3 V ±0.3 V supply, and 100-year data retention. It serves as a drop-in SRAM replacement in systems requiring persistent memory across power cycles, such as industrial PLCs, metering registers, and network configuration storage.
For engineers reviewing the STK14C88-3NF45TR datasheet, STK14C88-3NF45TR pinout, STK14C88-3NF45TR application, or STK14C88-3NF45TR equivalent, key selection criteria include VCAP capacitor sizing (68–220 µF), HSB timing coordination for multi-device STORE synchronization, software STORE/RECALL address sequence validation, and compatibility with 32-pin SOIC footprint and 3.3 V I/O logic levels.
Technical Context
The STK14C88-3NF45TR integrates a standard fast SRAM array (512 × 512) with parallel QuantumTrap nonvolatile cells per bit, enabling simultaneous STORE/RECALL of all 32,768 bytes. Its dual-mode STORE operation-automatic on VCC drop below VSWITCH or hardware/software-triggered-relies on charge stored at VCAP to complete nonvolatile write without external power.
Hardware STORE uses open-drain HSB for busy signaling and inter-device synchronization; software STORE/RECALL require exact six-address CE-controlled READ sequences (e.g., 0x0E38 → 0x0FC0 for STORE). RECALL occurs automatically at power-up or via software, restoring full SRAM content in tHRECALL ≤ 20 ms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 Kbit (32K × 8), directly replaces standard 32K × 8 SRAMs without redesign. |
| Access Time | 45 ns max, defines minimum cycle time for reliable read/write under 3.3 V operation. |
| Data Retention | 100 years at +25°C, guarantees nonvolatile data integrity without refresh or backup power. |
| STORE Endurance | 1,000,000 cycles, sets maximum number of nonvolatile writes before wear-out. |
| Supply Voltage | 3.3 V ±0.3 V, requires stable low-noise rail; VCAP must be decoupled with 68–220 µF capacitor. |
| Operating Temp | −40°C to +85°C (industrial grade), supports deployment in uncontrolled ambient environments. |
| Pin Count & Type | 32-pin SOIC (300-mil), surface-mount compatible with standard reflow profiles. |
Pinout & Package
STK14C88-3NF45TR is housed in a 32-pin Small Outline Integrated Circuit (SOIC) package with 300-mil body width, JEDEC MS-012AC compliant, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Input | 15-bit address bus selecting one of 32,768 memory locations; latched on CE/WE transitions. |
| DQ0–DQ7 | Bidirectional Data I/O | 8-bit common data bus; tristated when OE HIGH or during STORE/RECALL. |
| CE (E) | Chip Enable | Active-low chip select; enables internal logic and memory access when LOW. |
| WE (W) | Write Enable | Active-low control for write cycles; must be stable before and during data latch. |
| OE (G) | Output Enable | Active-low control for output drivers; disables DQ outputs when HIGH. |
| HSB | Hardware Store Busy | Open-drain status/output; driven LOW during STORE/RECALL; initiates STORE when pulled LOW externally. |
| VCAP | AutoStore Capacitor Supply | Connects to external 68–220 µF capacitor; supplies energy for STORE during VCC collapse. |
| VCC | Power Supply | 3.3 V ±0.3 V main supply; powers SRAM and control logic; disconnects from VCAP at VSWITCH (~2.7 V). |
| VSS | Ground | System reference ground; must be low-impedance return path for VCAP discharge current. |
Key Features
| Feature | Design Value |
|---|---|
| AutoStore on Power Loss | Automatic nonvolatile STORE triggered by VCC drop below VSWITCH, using charge from VCAP capacitor-no firmware or host intervention required. |
| Software STORE/RECALL | Initiated via precise 6-address CE-controlled READ sequence (e.g., 0x0E38 → 0x0FC0), enabling deterministic, on-demand persistence without hardware signal changes. |
| QuantumTrap Cell Architecture | Embedded nonvolatile element per SRAM cell ensures bit-level reliability and eliminates block erase limitations found in flash-based nvSRAMs. |
| Unlimited SRAM Endurance | Standard SRAM read/write operations support infinite cycles-no wear leveling or write throttling needed during normal operation. |
| Multi-Device HSB Synchronization | HSB pins tied together with shared VCAP enable coordinated STORE across multiple STK14C88-3 devices using single capacitor, reducing BOM count and board space. |
Applications
| Industrial Data Logging | Network Equipment Configuration |
|---|---|
Use Scenario: Continuous recording of sensor readings or event timestamps in programmable logic controllers where power interruptions are frequent. IC Role / Device Role / Timing Role: Nonvolatile SRAM buffer that retains last valid state and operational parameters across unexpected brownouts. Use Value: Eliminates need for battery-backed RAM or external EEPROM write sequencing, reducing failure points and qualification overhead. | Use Scenario: Storing router/switch startup configuration, MAC tables, or security keys that must survive reboot or power loss. IC Role / Device Role / Timing Role: Persistent configuration store accessed as standard SRAM during boot and runtime, with automatic recall on power-up. Use Value: Enables zero-delay recovery of critical settings without boot-time EEPROM polling or checksum validation delays. |
| Smart Meter Firmware State | Medical Device Calibration Storage |
Use Scenario: Capturing billing cycle counters, tamper events, or firmware update progress in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: High-reliability nonvolatile scratchpad for mission-critical state variables updated frequently during meter operation. Use Value: Guarantees 100-year retention of regulatory-compliant usage data without periodic refresh or external NV backup. | Use Scenario: Holding factory-calibrated sensor offsets and gain coefficients in portable diagnostic equipment subject to sterilization cycles. IC Role / Device Role / Timing Role: Tamper-resistant, radiation-tolerant nonvolatile memory for calibration constants accessed at device initialization. Use Value: Maintains traceable calibration integrity across device lifetime without recalibration after thermal stress or power cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STK14CA8-3AF45T | Same 256 Kbit density and 45 ns speed, but uses newer AutoStore+ architecture with faster tSTORE (12 ms vs. 20 ms) and lower VCAP leakage. | Supports higher temperature range (−40°C to +105°C) and tighter VCC tolerance (3.3 V ±5%), suitable for automotive under-hood use. | Select when extended temperature operation or reduced VCAP hold-up time is required; not pin-compatible due to different HSB behavior. |
| FM24V01A-G | 1 Mbit density, 400 kHz I²C interface, ferroelectric (FRAM) technology-no STORE delay, no VCAP capacitor, but serial access limits bandwidth. | Used where low pin count, byte-level writes, and no STORE timing constraints outweigh need for parallel SRAM speed. | Choose for space-constrained designs needing simple two-wire interface and guaranteed 10¹⁴ endurance-requires firmware rewrite for serial protocol handling. |
Compared with STK14CA8-3AF45T, the STK14C88-3NF45TR offers proven industrial reliability but lacks extended temp rating and faster STORE; versus FM24V01A-G, it delivers full SRAM bandwidth and parallel interface at the cost of VCAP design complexity and STORE latency.
Availability
STK14C88-3NF45TR is available at Aetrix Electronics and suitable for industrial data logging, network equipment configuration, and smart meter firmware state storage requiring stable component supply and long-term lifecycle support.
Supply support for STK14C88-3NF45TR 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 STK14C88 series targets applications demanding seamless SRAM performance with guaranteed nonvolatile data retention-designed specifically for systems where battery backup is impractical and flash endurance is insufficient.
FAQ
What is the minimum VCAP capacitance required for reliable AutoStore operation?
The STK14C88-3NF45TR requires a minimum 68 µF tantalum or aluminum electrolytic capacitor rated ≥4.7 V on the VCAP pin. Capacitance below this value may cause incomplete STORE during rapid VCC collapse. Derating for temperature and aging is recommended; 100 µF is commonly used for margin. The capacitor must be placed within 10 mm of the VCAP pin with low-inductance routing.
Can STK14C88-3NF45TR be used without connecting the HSB pin?
Yes-HSB is optional. When unused, it should be left floating (not tied HIGH or LOW), as an internal weak pull-up holds it HIGH. Leaving HSB unconnected disables hardware STORE initiation and removes busy signaling, but AutoStore on power loss and software STORE/RECALL remain fully functional.
How does the AutoStore Inhibit mode change system design?
In AutoStore Inhibit mode, VCC is grounded and +3.3 V is applied to VCAP, disabling automatic STORE on power loss. All STORE operations become software-only, eliminating VCAP discharge timing constraints and simplifying power monitoring. However, this requires firmware to explicitly trigger STORE before shutdown, increasing software dependency and risk of data loss if shutdown is abrupt.
Is the STK14C88-3NF45TR still recommended for new designs?
No-Cypress documentation explicitly marks the STK14C88-3 as "Not Recommended for New Designs." It remains supported for legacy production and repair, but Infineon recommends migrating to the STK14CA8 series (e.g., STK14CA8-3AF45T) for new projects due to enhanced STORE timing, extended temperature range, and improved VCAP efficiency.
STK14C88-3NF45TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 32-SOIC (0.295", 7.50mm 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:
- 256Kbit
- Memory Organization:
- 32K 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:
- 32-SOIC
STK14C88-3NF45TR FAQ
1.How can I place an order for STK14C88-3NF45TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STK14C88-3NF45TR 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 STK14C88-3NF45TR reliable?
The price and inventory of STK14C88-3NF45TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK14C88-3NF45TR is usually 5 days.
3.What payment methods are accepted for STK14C88-3NF45TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK14C88-3NF45TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK14C88-3NF45TR?
STK14C88-3NF45TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK14C88-3NF45TR 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 STK14C88-3NF45TR?
For technical support, including STK14C88-3NF45TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK14C88-3NF45TR requirements.
6.How does Aetrix verify that STK14C88-3NF45TR is sourced from the original manufacturer or authorized distributors?
All STK14C88-3NF45TR 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 STK14C88-3NF45TR meets industry standards.
7.What is the process for return or replacement of STK14C88-3NF45TR?
All STK14C88-3NF45TR units undergo pre-shipment inspection (PSI). If there is an issue with STK14C88-3NF45TR, 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 STK14C88-3NF45TR part is unused and in its original packaging.
Return procedure for STK14C88-3NF45TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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