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Infineon Technologies STK14C88-3NF35TR
- Part No.:
- STK14C88-3NF35TR
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 32-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
STK14C88-3NF35TR.pdf
- Description:
- IC NVSRAM 256KBIT PAR 32SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,391
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Product details
Overview
STK14C88-3NF35TR 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 at 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 power or battery.
For engineers reviewing the STK14C88-3NF35TR datasheet, STK14C88-3NF35TR pinout, STK14C88-3NF35TR application, or STK14C88-3NF35TR equivalent, key selection criteria include AutoStore timing behavior, VCAP capacitor sizing (68–220 µF), HSB hardware handshake latency, and software STORE/RECALL address sequence integrity.
Technical Context
The STK14C88-3NF35TR integrates a standard fast SRAM array (512 × 512) with parallel-connected QuantumTrap nonvolatile storage 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 (on VCC drop below VSWITCH), hardware-triggered (via HSB pin pull-down), and software-controlled (six-address CE-read sequence). RECALL occurs automatically at power-up or via identical six-address sequence ending in 0x0C63.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 Kbit (32K × 8), enabling byte-wide interface for legacy microcontroller bus designs. |
| Access Time | 35 ns, defining minimum cycle time for reliable SRAM read/write under worst-case commercial temperature. |
| Data Retention | 100 years at +25°C, guaranteed nonvolatile data survival without refresh or power. |
| STORE Endurance | 1,000,000 cycles, limiting total nonvolatile write events over product lifetime. |
| Supply Voltage | 3.3V ±0.3V, requiring tight regulation and compatibility with 3.3V logic families. |
| VCAP Capacitor Range | 68–220 µF (±20%), directly determining STORE energy margin and reliability during brownout. |
| Operating Temperature | −40°C to +85°C (industrial grade), supporting deployment in uncontrolled ambient environments. |
Pinout & Package
STK14C88-3NF35TR is housed in a 32-pin SOIC package (300-mil width), pin-compatible with industry-standard 32-pin nvSRAM footprints.
| 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 bus shared for read and write; tristated when OE HIGH or during STORE/RECALL. |
| WE | Write Enable (Active LOW) | Controls write initiation; must remain stable during entire write cycle to prevent partial writes. |
| CE | Chip Enable (Active LOW) | Primary device select; required LOW for all SRAM operations and software STORE/RECALL sequences. |
| OE | Output Enable (Active LOW) | Enables output drivers during reads; must be HIGH during writes to avoid bus contention. |
| HSB | Hardware Store Busy | Open-drain status/output pin: 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 operation during VCC collapse. |
| VCC | Power Supply | 3.3V ±0.3V main supply; powers SRAM and charges VCAP capacitor during normal operation. |
| VSS | Ground | System reference ground; must be low-impedance to support fast switching and STORE current surge. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic STORE on Power Loss | Eliminates need for external battery or supercapacitor backup; triggered by internal VCC monitoring at VSWITCH threshold. |
| Software-Controlled STORE/RECALL | Enables deterministic, application-timed persistence using six-address CE-read sequence-no hardware signal required. |
| Hardware STORE Synchronization (HSB) | Allows coordinated STORE across multiple nvSRAMs sharing one VCAP capacitor, reducing BOM count and board area. |
| Unlimited SRAM Read/Write Endurance | Supports high-frequency data logging or buffer applications without wear-out concerns typical of flash or EEPROM. |
| QuantumTrap Nonvolatile Cell | Provides bit-level nonvolatility with 100-year retention and immunity to radiation-induced bit flips in industrial settings. |
Applications
| Industrial PLC Data Logging | Medical Device Configuration Storage |
|---|---|
|
Use Scenario: Storing runtime parameters and alarm history in programmable logic controllers during mains failure. IC Role / Device Role / Timing Role: Nonvolatile SRAM providing immediate, byte-accessible storage without delay or erase cycles. Use Value: Guarantees zero-data-loss recovery after unexpected power interruption, meeting IEC 61131-2 safety requirements. |
Use Scenario: Preserving calibration coefficients and user preferences in portable diagnostic equipment between power cycles. IC Role / Device Role / Timing Role: Persistent memory holding critical configuration data with no battery maintenance or replacement. Use Value: Enables FDA-compliant traceability and eliminates field failures due to battery depletion or leakage. |
| Telecom Base Station Control Memory | Automotive Body Control Module (BCM) |
|
Use Scenario: Caching network synchronization state and firmware patch metadata in remote radio units. IC Role / Device Role / Timing Role: Fast-access, nonvolatile scratchpad memory supporting sub-100ms reboot recovery. Use Value: Reduces service downtime by restoring operational state within one power-on cycle, avoiding reinitialization delays. |
Use Scenario: Storing door lock status, seat position memory, and lighting profiles in 12V automotive systems. IC Role / Device Role / Timing Role: Power-loss-resilient memory interfacing directly to 3.3V microcontroller buses. Use Value: Meets ISO 7637-2 pulse test requirements by retaining data through load-dump and cold-crank transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AS4C32M8SA-35BIN | 32M×8 DDR3 SDRAM with onboard backup controller; requires external capacitor and firmware driver. | Higher density but lacks atomic STORE/RECALL; introduces latency and software overhead. | Select only if >256 Kbit capacity is mandatory and system can accommodate driver integration. |
| FM24CL64B | 64 Kbit F-RAM with 15 ns access, unlimited endurance, but no AutoStore-requires explicit write commands. | No power-loss automation; relies on host to detect brownout and initiate save before VCC collapse. | Prefer where deterministic low-latency writes dominate over power-fail resilience. |
Compared with AS4C32M8SA-35BIN and FM24CL64B, STK14C88-3NF35TR uniquely delivers autonomous, hardware-governed STORE/RECALL without host intervention or external controller, making it optimal for safety-critical, low-software-footprint embedded systems.
Availability
STK14C88-3NF35TR is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostic devices, telecom base station controllers, and automotive body control modules requiring stable component supply and long-term lifecycle support.
Supply support for STK14C88-3NF35TR 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 connectivity solutions for industrial and automotive markets.
The STK14C88-3NF35TR belongs to Cypress's nvSRAM product line, engineered specifically for applications demanding instant, reliable, and maintenance-free nonvolatile data retention without batteries or complex power management.
FAQ
What is the minimum VCAP capacitor value required for reliable AutoStore operation?
The datasheet specifies a minimum VCAP capacitance of 68 µF (±20%) rated at 4.7V. Using less than this value risks incomplete STORE execution during rapid VCC collapse, leading to data corruption. Derating for temperature and aging is recommended; 100 µF is commonly used in production designs to ensure margin across voltage and temperature extremes.
Can STK14C88-3NF35TR be used in place of standard SRAM without modifying existing hardware?
Yes-pinout and AC timing are fully compatible with standard 32K×8 SRAMs in 32-pin SOIC. However, VCAP must be added and connected, and HSB should be left unconnected or pulled up if unused. No changes to address/data/control signals are needed, but software must avoid unintended STORE triggers via the six-address sequence.
How does the HSB pin behave during a software-initiated STORE?
During software STORE, HSB remains HIGH (not driven) unless externally pulled LOW. Unlike hardware STORE, software initiation does not assert HSB as a busy indicator. The host must rely on timing (tSTORE = 20 ms max) or polling via the address sequence to determine completion-HSB provides no status feedback in this mode.
Is STK14C88-3NF35TR suitable for new designs given its "Not Recommended for New Designs" status?
While Cypress marked it "Not Recommended for New Designs" in 2009 due to newer nvSRAM generations (e.g., STK15C88), STK14C88-3NF35TR remains actively manufactured and supported by Infineon for legacy program continuity. Its proven reliability, full documentation, and broad distributor stock make it viable for cost-sensitive or long-lifecycle industrial designs where qualification effort outweighs marginal feature gains.
STK14C88-3NF35TR 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:
- 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
STK14C88-3NF35TR FAQ
1.How can I place an order for STK14C88-3NF35TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STK14C88-3NF35TR 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 STK14C88-3NF35TR reliable?
The price and inventory of STK14C88-3NF35TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK14C88-3NF35TR is usually 5 days.
3.What payment methods are accepted for STK14C88-3NF35TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK14C88-3NF35TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK14C88-3NF35TR?
STK14C88-3NF35TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK14C88-3NF35TR 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 STK14C88-3NF35TR?
For technical support, including STK14C88-3NF35TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK14C88-3NF35TR requirements.
6.How does Aetrix verify that STK14C88-3NF35TR is sourced from the original manufacturer or authorized distributors?
All STK14C88-3NF35TR 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 STK14C88-3NF35TR meets industry standards.
7.What is the process for return or replacement of STK14C88-3NF35TR?
All STK14C88-3NF35TR units undergo pre-shipment inspection (PSI). If there is an issue with STK14C88-3NF35TR, 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 STK14C88-3NF35TR part is unused and in its original packaging.
Return procedure for STK14C88-3NF35TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STK14C88-3NF35TR Tags
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