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Infineon Technologies STK14C88-3NF45
- Part No.:
- STK14C88-3NF45
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 32-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
STK14C88-3NF45.pdf
- Description:
- IC NVSRAM 256KBIT PAR 32SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,371
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Product details
Overview
STK14C88-3NF45 from Cypress Semiconductor is a 256 Kbit (32K × 8) nonvolatile SRAM with AutoStore functionality, integrating QuantumTrap nonvolatile storage per cell. It operates on a single 3.3V ±0.3V supply, delivers 45 ns access time, supports automatic STORE on power loss and RECALL on power-up, and targets data-critical industrial control and metering systems requiring guaranteed data retention after unexpected shutdown.
For engineers reviewing the STK14C88-3NF45 datasheet, STK14C88-3NF45 pinout, STK14C88-3NF45 application, or STK14C88-3NF45 equivalent, key selection considerations include VCAP capacitor sizing (68–220 µF), HSB-driven hardware STORE synchronization, software STORE/RECALL address sequence integrity, and compatibility with legacy 32-pin SOIC footprint designs.
Technical Context
The STK14C88-3NF45 combines a standard fast SRAM array (512 × 512) with parallel-connected QuantumTrap nonvolatile cells, enabling simultaneous STORE/RECALL across all 32,768 bytes. Its dual-mode STORE control-automatic via VCAP discharge below VSWITCH (~2.7V) or hardware-triggered via HSB assertion-ensures deterministic nonvolatile capture without external controllers.
RECALL is initiated automatically at power-up when VCC exceeds VSWITCH, completing in tHRECALL ≤ 20 ms; software-initiated STORE/RECALL use strict six-address CE-controlled READ sequences (e.g., 0x0E38 → 0x0FC0 for STORE), with no intervening accesses permitted. During STORE/RECALL, SRAM I/O is disabled and WE/OE/CE are ignored.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 Kbit (32K × 8), directly replacing standard 32K × 8 SRAMs without redesign. |
| Access Time | 45 ns maximum, defining minimum cycle time for reliable read/write under worst-case timing margins. |
| Data Retention | 100 years at +25°C, ensuring long-term archival of configuration or event logs without refresh. |
| STORE Endurance | 1,000,000 cycles, limiting field lifetime in high-frequency logging applications unless inhibited. |
| VCAP Requirement | 68–220 µF tantalum/ceramic capacitor at VCAP pin, sized to sustain full STORE during VCC dropout ≥ 20 µs. |
| Operating Voltage | 3.3V ±0.3V, compatible with standard LVTTL logic interfaces and eliminating need for voltage translation. |
| Temperature Range | Industrial: –40°C to +85°C, supporting deployment in uncontrolled environments like utility meters or factory PLCs. |
Pinout & Package
STK14C88-3NF45 uses a 32-pin Small Outline Integrated Circuit (SOIC) package with 300-mil body width and standard 0.050" lead pitch. Pin layout matches JEDEC MS-012AC, enabling drop-in replacement in existing PCB footprints designed for 32K × 8 SRAMs.
| 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 data path shared for read output and write input; tristated when OE HIGH or during STORE/RECALL. |
| WE | Write Enable (Active LOW) | Controls write initiation; must be stable before CE assertion and held LOW for full tWR duration. |
| CE | Chip Enable (Active LOW) | Primary device select; required LOW for all operations except HSB-driven STORE initiation. |
| OE | Output Enable (Active LOW) | Enables DQ drivers during reads; HIGH disables outputs to prevent bus contention during writes. |
| HSB | Hardware Store Busy | Open-drain status/output: driven LOW during STORE/RECALL; pulled LOW externally to trigger hardware STORE. |
| VCAP | AutoStore Capacitor Terminal | Connects external 68–220 µF capacitor; supplies energy for STORE when VCC drops below VSWITCH. |
| VCC | Power Supply | 3.3V ±0.3V main supply; powers SRAM and charges VCAP during normal operation. |
| VSS | Ground | System reference ground; must be low-impedance to support fast STORE current surge. |
Key Features
| Feature | Design Value |
|---|---|
| AutoStore on Power Loss | Guarantees data persistence without host intervention when VCC falls below VSWITCH, using stored VCAP energy. |
| Software STORE/RECALL | Enables deterministic, host-controlled nonvolatile operations via six-address CE-read sequence-no extra control lines needed. |
| Unlimited SRAM Endurance | Supports continuous read/write cycling (e.g., real-time buffers) without wear-out, unlike flash or EEPROM. |
| Hardware STORE Synchronization | Multiple STK14C88-3NF45 devices share one VCAP and HSB bus to coordinate STORE across memory banks. |
| QuantumTrap Cell Architecture | Provides 100-year data retention and 1M STORE cycles by embedding nonvolatile storage directly in each SRAM cell. |
Applications
| Smart Energy Metering | Industrial PLC Data Logging |
|---|---|
Use Scenario: Capturing cumulative kWh, tariff switching events, and tamper alerts during grid outages. IC Role / Device Role / Timing Role: Nonvolatile buffer storing last valid meter readings and timestamps before AC power failure. Use Value: Eliminates need for backup batteries or supercapacitors while guaranteeing 100-year retention of regulatory-compliant usage history. | Use Scenario: Recording machine state, sensor faults, and operational cycles in programmable logic controllers. IC Role / Device Role / Timing Role: Fail-safe memory holding critical runtime variables and error codes during brownouts. Use Value: Enables deterministic post-failure diagnostics and system recovery without host firmware changes or external NVRAM controllers. |
| Medical Device Configuration Storage | Telecom Base Station Alarms |
Use Scenario: Preserving calibration coefficients, user preferences, and safety thresholds in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, battery-free storage of FDA-required configuration parameters across power cycles. Use Value: Meets IEC 62304 data integrity requirements without adding BOM cost or reliability risk from backup power sources. | Use Scenario: Archiving network fault events, signal strength drops, and handover failures in cellular infrastructure. IC Role / Device Role / Timing Role: High-reliability ring buffer capturing transient alarms that occur milliseconds before power collapse. Use Value: Provides traceable, timestamped failure records for root-cause analysis without relying on volatile DRAM or slow flash writes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STK14CA8-3AF45 | Same architecture but RoHS-compliant, lead-free 32-pin SOIC; identical timing and pinout. | No functional change; required for new designs targeting modern environmental compliance standards. | Select when lead-free manufacturing or updated RoHS certification is mandatory. |
| FM1808-40-PG | 4 Mbit density, 40 ns access, uses FRAM instead of QuantumTrap; unlimited STORE endurance, no VCAP capacitor needed. | Higher density and simpler power design, but lacks AutoStore hardware trigger (HSB) and requires different software interface. | Choose for larger buffer needs and elimination of external capacitor, accepting FRAM's lower write latency trade-off. |
Compared with STK14C88-3NF45, STK14CA8-3AF45 offers identical functionality with lead-free packaging, while FM1808-40-PG provides higher density and capacitor-free operation at the cost of losing HSB-based STORE coordination and requiring FRAM-specific timing handling.
Availability
STK14C88-3NF45 is available at Aetrix Electronics and suitable for smart metering, industrial PLC data logging, and medical device configuration storage requiring stable component supply and long-term obsolescence management.
Supply support for STK14C88-3NF45 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 STK14C88-3NF45 belongs to Cypress's nvSRAM product line, engineered to replace battery-backed SRAM in mission-critical systems where maintenance-free, long-life nonvolatile storage is essential.
FAQ
What capacitor value and type should be used on the VCAP pin?
A 68 µF to 220 µF tantalum or low-ESR ceramic capacitor rated at 4.7V must be connected between VCAP and VSS. The capacitor must be placed within 0.5 inches of the VCAP pin with short, wide traces to minimize inductance. Values outside this range risk incomplete STORE execution or excessive inrush current during power-up.
Can STK14C88-3NF45 be used without connecting the HSB pin?
Yes - HSB is optional. If unused, it may be left floating, as an internal weak pull-up holds it HIGH. However, omitting HSB forfeits hardware-triggered STORE capability and real-time STORE-in-progress status indication, limiting control to AutoStore-on-power-loss and software-only methods.
How does the software STORE sequence prevent accidental activation?
The six-address sequence (0x0E38 → 0x0FC0) requires consecutive CE-controlled READs with no intervening writes or address violations. Any deviation - including incorrect address order, missing READ, or concurrent WE assertion - aborts the sequence. This ensures STORE only occurs under deliberate, validated host control.
Is STK14C88-3NF45 suitable for new designs despite "Not Recommended for New Designs" in its datasheet?
No - Cypress explicitly marks STK14C88-3 as Not Recommended for New Designs due to end-of-life planning. While functional and supported through Aetrix's continuity program, new designs should consider STK14CA8-3AF45 (RoHS-compliant drop-in) or evaluate Infineon's newer nvSRAM generations for long-term roadmap alignment.
STK14C88-3NF45 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:
- 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
STK14C88-3NF45 FAQ
1.How can I place an order for STK14C88-3NF45 through Aetrix?
Please submit a Request for Quotation (RFQ) for STK14C88-3NF45 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 STK14C88-3NF45 reliable?
The price and inventory of STK14C88-3NF45 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK14C88-3NF45 is usually 5 days.
3.What payment methods are accepted for STK14C88-3NF45?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK14C88-3NF45 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK14C88-3NF45?
STK14C88-3NF45 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK14C88-3NF45 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 STK14C88-3NF45?
For technical support, including STK14C88-3NF45 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK14C88-3NF45 requirements.
6.How does Aetrix verify that STK14C88-3NF45 is sourced from the original manufacturer or authorized distributors?
All STK14C88-3NF45 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 STK14C88-3NF45 meets industry standards.
7.What is the process for return or replacement of STK14C88-3NF45?
All STK14C88-3NF45 units undergo pre-shipment inspection (PSI). If there is an issue with STK14C88-3NF45, 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 STK14C88-3NF45 part is unused and in its original packaging.
Return procedure for STK14C88-3NF45:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STK14C88-3NF45 Tags
-
M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
Microchip Technology
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24LC01BT-I/OT
Microchip Technology
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M24C02-FMC6TG
STMicroelectronics
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AT24CS02-SSHM-T
Microchip Technology
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Microchip Technology
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AT24C04C-SSHM-T
Microchip Technology
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Microchip Technology
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Microchip Technology
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AT24C08C-STUM-T
Microchip Technology
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