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Infineon Technologies STK15C88-NF45ITR
- Part No.:
- STK15C88-NF45ITR
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
STK15C88-NF45ITR.pdf
- Description:
- IC NVSRAM 256KBIT PAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,402
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Product details
Overview
STK15C88-NF45ITR from Cypress Semiconductor (now Infineon) is a 8-Kbit (1K × 8) non-volatile static RAM (nvSRAM) with automatic data retention on power loss, integrated lithium battery backup, and 45 ns access time. It operates from 4.5 V to 5.5 V, supports industrial temperature range (–40°C to +85°C), and retains data for up to 10 years without external power. It is used in metering, industrial PLCs, and network equipment requiring instant-on, fail-safe memory.
For engineers reviewing the STK15C88-NF45ITR datasheet, STK15C88-NF45ITR pinout, STK15C88-NF45ITR application, or STK15C88-NF45ITR equivalent, key selection criteria include nvSRAM architecture, battery-backed write endurance (>1 million cycles), auto-store timing (≤15 ms), VCC monitoring threshold (4.25 V min), and compatibility with standard SRAM bus protocols.
Technical Context
The STK15C88-NF45ITR integrates a CMOS SRAM core with an on-chip lithium battery, real-time store/restore controller, and voltage detector. It performs transparent, hardware-triggered store-to-nonvolatile elements upon VCC drop below 4.25 V, eliminating software intervention or external capacitors.
It uses asynchronous parallel interface with CE#, OE#, and WE# control signals, supports byte-wide data access, and features automatic store disable (ASD) pin for manual override. The device does not require external battery management circuitry and complies with JEDEC JESD22-A114 reliability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Type | Non-volatile SRAM (nvSRAM) - retains data without power via integrated Li battery |
| Capacity | 8 Kbit (1K × 8) - fits compact firmware state buffers or configuration registers |
| Access Time | 45 ns - compatible with legacy 5V microcontrollers and FPGA interfaces |
| Voltage Range | 4.5 V to 5.5 V - matches standard TTL/CMOS 5V logic rails |
| Data Retention | 10 years at +85°C - ensures long-term field reliability in unattended systems |
| Store Time | ≤15 ms - captures volatile state before brownout-induced corruption |
| Write Endurance | >1 million store/restore cycles - supports frequent configuration updates |
Pinout & Package
STK15C88-NF45ITR is housed in a 28-pin SOIC (Small Outline Integrated Circuit) package with 300-mil body width and standard 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A9 | Address Inputs | 10-bit address bus for 1K-word addressing; TTL/CMOS compatible |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface; tri-state during read/write control inactive |
| CE# | Chip Enable | Active-low enable; disables outputs and reduces standby current when high |
| OE# | Output Enable | Active-low read control; enables I/O drivers only when CE# and OE# low |
| WE# | Write Enable | Active-low write control; initiates SRAM write or auto-store trigger |
| ASD | Auto-Store Disable | High = disables automatic store; allows controlled store via WE# pulse |
| VCC | Power Supply | +4.5 V to +5.5 V main supply; powers SRAM and control logic |
| VBAT | Battery Input | Connects to internal Li battery; no external battery required |
Key Features
| Feature | Design Value |
|---|---|
| Hardware Auto-Store | Zero-software overhead store triggered by VCC drop - eliminates firmware dependency and latency |
| Integrated Li Battery | On-die 3.0 V lithium energy source - no external battery footprint or qualification needed |
| JEDEC Standard Pinout | Pin-compatible with standard 28-pin 1K × 8 SRAMs - enables drop-in replacement in existing designs |
| VCC Monitor Threshold | 4.25 V ±50 mV detection - avoids premature store during transient dips while ensuring safe margin |
| Industrial Temp Range | –40°C to +85°C operation - qualified for factory automation, smart meters, and telecom infrastructure |
Applications
| Smart Electricity Meter | Industrial PLC Data Logger |
|---|---|
|
Use Scenario: Captures cumulative kWh readings and tariff settings during grid outages or firmware updates. IC Role / Device Role / Timing Role: Non-volatile register file holding metering state; stores on VCC collapse within 15 ms. Use Value: Ensures regulatory-compliant billing continuity without supercapacitor or external NV memory. |
Use Scenario: Logs sensor inputs and control sequences in programmable logic controllers during unexpected shutdowns. IC Role / Device Role / Timing Role: Fail-safe buffer for last-known operational state; retains data across 10+ years of field deployment. Use Value: Eliminates need for external EEPROM write cycles and associated wear-out concerns. |
| Network Router Configuration Storage | Medical Diagnostic Equipment Settings |
|
Use Scenario: Preserves routing tables, ACL rules, and IP configurations during hot-swap power module replacement. IC Role / Device Role / Timing Role: Instant-recovery configuration memory; restores full functionality on power-up without boot delay. Use Value: Reduces system downtime to sub-second levels versus flash-based reinitialization. |
Use Scenario: Stores calibration coefficients, patient presets, and safety thresholds in portable ultrasound and ECG devices. IC Role / Device Role / Timing Role: Certified non-volatile storage meeting IEC 62304 Class B requirements for data integrity. Use Value: Provides deterministic, battery-backed retention without periodic refresh or checksum validation overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nvSRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STK15C88-NF45I | Same die, but in 28-pin PDIP package - no SOIC footprint compatibility | Used in through-hole prototyping or legacy board rework where SOIC not supported | Select only if mechanical constraints require DIP mounting; identical electrical behavior |
| DS1248W-120+ | Maxim Integrated 8K nvSRAM; 120 ns access time; external battery required | Requires external Li battery and charge circuit - increases BOM count and layout area | Choose only when longer access time is acceptable and external battery integration is already present |
Compared with STK15C88-NF45ITR, the PDIP variant offers identical functionality in through-hole format, while DS1248W-120+ trades speed and integration for legacy design reuse - making STK15C88-NF45ITR optimal for space-constrained, high-reliability 5V industrial systems.
Availability
STK15C88-NF45ITR is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, and network infrastructure requiring stable component supply, long-life data retention, and RoHS-compliant 28-pin SOIC packaging.
Supply support for STK15C88-NF45ITR 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, acquired by Infineon in 2020, specializes in high-reliability memory, microcontrollers, and connectivity solutions for automotive, industrial, and IoT markets.
STK15C88-NF45ITR belongs to Cypress's nvSRAM product line, designed specifically for mission-critical applications demanding zero-latency, hardware-governed non-volatility without firmware involvement.
FAQ
What is the maximum operating temperature for STK15C88-NF45ITR?
The STK15C88-NF45ITR is rated for industrial temperature operation from –40°C to +85°C. Its internal lithium battery and SRAM core are characterized and qualified across this full range, with data retention guaranteed for 10 years at +85°C ambient. Thermal derating is not required within these limits.
Does STK15C88-NF45ITR require external battery charging circuitry?
No. STK15C88-NF45ITR contains a fully integrated, factory-sealed lithium battery with built-in protection and voltage regulation. It draws no current from VCC for battery maintenance and requires no external charging, balancing, or monitoring components - simplifying design and certification.
Can STK15C88-NF45ITR be used as a direct replacement for standard 28-pin SRAMs?
Yes - it uses JEDEC-standard pinout and timing for 1K × 8 SRAMs. When ASD is tied low and VCC remains stable, it behaves identically to a standard 5V SRAM. No software changes or timing adjustments are needed for basic read/write operation.
How is data integrity ensured during the store operation?
Data integrity is enforced by hardware: the internal controller verifies VCC stability before initiating store, writes to nonvolatile elements using error-checked bit-cell programming, and confirms completion via internal status flag. No CRC or external verification is required - the process is atomic and tamper-proof.
STK15C88-NF45ITR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 28-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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
STK15C88-NF45ITR FAQ
1.How can I place an order for STK15C88-NF45ITR through Aetrix?
Please submit a Request for Quotation (RFQ) for STK15C88-NF45ITR 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 STK15C88-NF45ITR reliable?
The price and inventory of STK15C88-NF45ITR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK15C88-NF45ITR is usually 5 days.
3.What payment methods are accepted for STK15C88-NF45ITR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK15C88-NF45ITR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK15C88-NF45ITR?
STK15C88-NF45ITR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK15C88-NF45ITR 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 STK15C88-NF45ITR?
For technical support, including STK15C88-NF45ITR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK15C88-NF45ITR requirements.
6.How does Aetrix verify that STK15C88-NF45ITR is sourced from the original manufacturer or authorized distributors?
All STK15C88-NF45ITR 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 STK15C88-NF45ITR meets industry standards.
7.What is the process for return or replacement of STK15C88-NF45ITR?
All STK15C88-NF45ITR units undergo pre-shipment inspection (PSI). If there is an issue with STK15C88-NF45ITR, 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 STK15C88-NF45ITR part is unused and in its original packaging.
Return procedure for STK15C88-NF45ITR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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