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Infineon Technologies STK11C88-NF45I
- Part No.:
- STK11C88-NF45I
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
STK11C88-NF45I.pdf
- Description:
- IC NVSRAM 256KBIT PAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,150
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Product details
Overview
STK11C88-NF45I from Cypress Semiconductor is a 256 Kbit (32K × 8) nonvolatile static RAM with integrated QuantumTrap nvSRAM technology, operating at 45 ns access time on a single 5V ±10% supply. It delivers unlimited SRAM read/write endurance, 1,000,000 STORE cycles, 100-year data retention, and automatic hardware RECALL on power-up - used in industrial control modules for persistent configuration storage during brownout events.
For engineers reviewing the STK11C88-NF45I datasheet, STK11C88-NF45I pinout, STK11C88-NF45I application, or STK11C88-NF45I equivalent, key selection criteria include software-initiated STORE/RECALL sequence compatibility, SOIC-28 package footprint alignment with legacy SRAM designs, VCC=4.5–5.5V operation, and industrial temperature support (–40°C to +85°C).
Technical Context
The STK11C88-NF45I integrates volatile SRAM and nonvolatile QuantumTrap memory cells in a unified 32K × 8 array. Its dual-mode operation supports standard SRAM read/write cycles and atomic software-controlled STORE/RECALL via six-address CE-controlled READ sequences (e.g., 0x0E38 → 0x0FC0 for STORE).
Hardware RECALL triggers automatically when VCC rises above VSWITCH after power loss, completing in tHRECALL ≤ 20 ms. The device enforces hardware protection below VSWITCH, disabling STORE and WRITE operations to prevent corruption during undervoltage conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 Kbit (32K × 8) - supports full byte-wide data bus interface without address multiplexing |
| Access Time | 45 ns - determines minimum SRAM read/write cycle time in high-speed microcontroller interfaces |
| Data Retention | 100 years - enables long-term firmware parameter storage without battery backup |
| STORE Endurance | 1,000,000 cycles - supports frequent configuration saves in logging or calibration systems |
| Operating Voltage | 4.5 V to 5.5 V - compatible with standard 5V TTL/CMOS logic rails and industrial power supplies |
| Temperature Range | –40°C to +85°C - qualified for deployment in uncontrolled industrial environments |
| Power Supply | Single 5V ±10% - eliminates need for auxiliary voltage rails or regulators |
Pinout & Package
STK11C88-NF45I is housed in a 28-pin SOIC (300 mil width) package with gull-wing leads, RoHS-compliant and compatible with standard surface-mount reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Input | 15-bit address bus selects one of 32,768 bytes; no multiplexing required |
| DQ0–DQ7 | Bidirectional Data I/O | 8-bit parallel data path shared for read and write; tristated when OE HIGH or during STORE/RECALL |
| WE | Write Enable (Active LOW) | Controls SRAM write initiation; must remain HIGH during software STORE/RECALL address sequences |
| CE | Chip Enable (Active LOW) | Enables device operation; used as clocking signal for six-cycle STORE/RECALL command execution |
| OE | Output Enable (Active LOW) | Activates output drivers during reads; kept HIGH during writes to avoid bus contention |
| VCC | Power Supply | 5V ±10% input; powers both SRAM and QuantumTrap cells; bypass capacitor (0.1 µF) required |
| VSS | Ground | System reference ground; must be low-impedance connection to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Software STORE/RECALL | Atomic 6-address CE-controlled READ sequence (e.g., 0x0E38 → 0x0FC0) enables deterministic nonvolatile save without dedicated control pins |
| Automatic Power-Up RECALL | Hardware-triggered restore from QuantumTrap cells within tHRECALL ≤ 20 ms after VCC exceeds VSWITCH, ensuring boot-time data integrity |
| Hardware Undervoltage Protection | Disables STORE and WRITE when VCC < VSWITCH, preventing partial writes or cell corruption during brownouts |
| Unlimited SRAM Endurance | Supports continuous real-time data logging and buffer updates without wear-out concerns |
| Pin Compatibility | Direct drop-in replacement for industry-standard 32K × 8 SRAMs (e.g., AS6C4008, CY62256), preserving PCB layout |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data Retention |
|---|---|
|
Use Scenario: Storing I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile SRAM providing immediate-access configuration memory that survives AC power loss and maintains state across firmware updates. Use Value: Eliminates need for external EEPROM or battery-backed RAM while guaranteeing sub-20 ms data restoration at boot, reducing BOM count and field failure risk. |
Use Scenario: Preserving sensor calibration coefficients and user-defined therapy settings in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Persistent memory element retaining FDA-required traceability data across 10+ year product lifecycles without maintenance. Use Value: Meets IEC 62304 Class C software requirements for data integrity by enabling verified STORE/RECALL sequences with no external supervision. |
| Telecom Base Station Real-Time Logs | Avionics Flight Recorder Buffer |
|
Use Scenario: Capturing network synchronization errors, fault codes, and SNMP trap history in LTE small cells operating in remote outdoor cabinets. IC Role / Device Role / Timing Role: High-reliability SRAM buffer with embedded nonvolatile backup, activated on watchdog timeout or thermal shutdown. Use Value: Provides deterministic 100-year retention of critical diagnostics without relying on flash endurance limits or wear-leveling algorithms. |
Use Scenario: Acting as pre-crash buffer in cockpit voice recorders, capturing last 30 seconds of audio before power interruption. IC Role / Device Role / Timing Role: Low-latency memory with guaranteed hardware RECALL on power restoration, meeting DO-160 Section 22 crash survivability timing. Use Value: Delivers <20 ms data recovery after transient power loss - faster than flash-based alternatives and immune to write-cycle exhaustion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY14B108ZSC-BAI | 1 Mbit density, 25 ns access, SPI interface, built-in RTC, requires separate STORE command register access | Higher density and integrated timekeeping; not pin-compatible; needs SPI driver integration | Select when system requires timestamped logging and >256 Kbit capacity; accept added firmware complexity |
| AS6C4008-55TIN | Standard 512 Kbit SRAM, no nonvolatile capability, 55 ns access, same SOIC-28 package | No STORE/RECALL functionality; requires external EEPROM + power-fail detection circuitry | Select only if nonvolatility is handled externally and board space allows additional components |
Compared with CY14B108ZSC-BAI and AS6C4008-55TIN, STK11C88-NF45I uniquely delivers pin-compatible nvSRAM functionality with zero external components, deterministic 45 ns timing, and proven field reliability in legacy industrial deployments - making it optimal for cost-sensitive, space-constrained upgrades of existing 32K × 8 SRAM designs.
Availability
STK11C88-NF45I is available at Aetrix Electronics and suitable for industrial PLCs, medical calibration systems, and telecom base station log buffers requiring stable component supply and long-term obsolescence support.
Supply support for STK11C88-NF45I 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, automotive, and consumer markets.
The STK11C88 belongs to Cypress's SoftStore nvSRAM product line, designed specifically to replace battery-backed SRAM and discrete EEPROM+SRAM combinations in mission-critical systems demanding guaranteed data retention without external supervision.
FAQ
What is the exact STORE sequence for STK11C88-NF45I?
The STORE operation requires six consecutive CE-controlled READ cycles to specific addresses in strict order: 0x0E38, 0x31C7, 0x03E0, 0x3C1F, 0x303F, then 0x0FC0. WE must remain HIGH throughout; OE may be HIGH or LOW. The device disables I/O after the sixth address until tSTORE (max 20 ms) completes.
Does STK11C88-NF45I require external circuitry for power-fail RECALL?
No. Hardware RECALL activates automatically when VCC rises above VSWITCH (~3.0 V) after power loss, restoring data from QuantumTrap cells to SRAM in ≤20 ms. A 10 kΩ pull-up resistor on CE or WE is recommended to prevent corruption if the device is in WRITE mode at power-up.
Can STK11C88-NF45I be used in new designs despite "Not recommended for new designs" status?
Yes - Cypress maintains active production solely to support ongoing programs. STK11C88-NF45I remains available with full datasheet compliance, industrial temperature rating, and 100-year retention. Aetrix guarantees supply continuity and provides obsolescence mitigation guidance for long-lifecycle projects.
How does QuantumTrap technology differ from conventional nvSRAM architectures?
QuantumTrap embeds nonvolatile storage directly into each SRAM cell using charge-trapping silicon nitride layers, eliminating separate EEPROM arrays or ferroelectric capacitors. This yields unlimited RECALL cycles, no write-disturb effects, and immunity to radiation-induced bit flips - validated over 15+ years in field-deployed industrial systems.
STK11C88-NF45I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 28-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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
STK11C88-NF45I FAQ
1.How can I place an order for STK11C88-NF45I through Aetrix?
Please submit a Request for Quotation (RFQ) for STK11C88-NF45I 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 STK11C88-NF45I reliable?
The price and inventory of STK11C88-NF45I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK11C88-NF45I is usually 5 days.
3.What payment methods are accepted for STK11C88-NF45I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK11C88-NF45I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK11C88-NF45I?
STK11C88-NF45I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK11C88-NF45I 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 STK11C88-NF45I?
For technical support, including STK11C88-NF45I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK11C88-NF45I requirements.
6.How does Aetrix verify that STK11C88-NF45I is sourced from the original manufacturer or authorized distributors?
All STK11C88-NF45I 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 STK11C88-NF45I meets industry standards.
7.What is the process for return or replacement of STK11C88-NF45I?
All STK11C88-NF45I units undergo pre-shipment inspection (PSI). If there is an issue with STK11C88-NF45I, 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 STK11C88-NF45I part is unused and in its original packaging.
Return procedure for STK11C88-NF45I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STK11C88-NF45I Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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AT24C04C-SSHM-T
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24AA02UIDT-I/OT
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