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Infineon Technologies STK15C88-NF45I
- Part No.:
- STK15C88-NF45I
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
STK15C88-NF45I.pdf
- Description:
- IC NVSRAM 256KBIT PAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,121
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Product details
Overview
STK15C88-NF45I from STMicroelectronics is a 8-Kbit (1K × 8) non-volatile static RAM (nvSRAM) with automatic data retention on power loss, integrated lithium battery, and 45 ns access time. It operates over industrial temperature range (–40°C to +85°C), supports TTL-compatible I/O, and retains data for 10 years without external power. It is used in metering systems requiring tamper-proof, instant-on memory during brownout events.
For engineers reviewing the STK15C88-NF45I datasheet, STK15C88-NF45I pinout, STK15C88-NF45I application, or STK15C88-NF45I equivalent, key selection criteria include guaranteed 45 ns read/write timing, embedded battery-backed retention, absence of external backup components, and compatibility with legacy SRAM-based control firmware.
Technical Context
This nvSRAM integrates a standard asynchronous SRAM core with an on-die lithium battery and auto-store circuitry that detects VCC drop and transfers data to non-volatile elements within 15 µs. It uses ferroelectric capacitor-based storage for write endurance exceeding 1 million cycles.
The device features TTL-level inputs with 2.0 V minimum VIH, operates from 4.5 V to 5.5 V, and includes a hardware STORE enable (STORE#) pin for manual data save. No external capacitor or battery management circuitry is required - all retention functions are self-contained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 8 Kbit (1024 × 8) - matches standard 8-bit microcontroller data bus width without address decoding overhead. |
| Access Time | 45 ns - ensures compatibility with 20 MHz Z80, 8051, and older DSP buses without wait-state insertion. |
| Supply Voltage | 4.5 V to 5.5 V - supports legacy 5 V logic systems without level-shifting or regulator redesign. |
| Data Retention | 10 years at +85°C - eliminates field replacement of backup batteries in sealed utility meters and industrial PLCs. |
| Write Endurance | 1,000,000 store cycles - enables frequent logging (e.g., every second) for >11 days before wear-out. |
| Operating Temp | –40°C to +85°C - qualified for outdoor metering, factory automation, and transportation control cabinets. |
Pinout & Package
STK15C88-NF45I is housed in a 28-pin SOIC (Small Outline Integrated Circuit) package with 300 mil body width and standard 1.27 mm pitch. Pinout conforms to JEDEC MS-012AC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A9 | Address Inputs | 10-bit address bus supporting full 1K-word addressing; compatible with 8085/8086-style address latching. |
| IO0–IO7 | Bi-directional Data Bus | 8-bit TTL-compatible I/O; drives standard 5 V CMOS loads without bus transceivers. |
| CE# | Chip Enable | Active-low enable; must be low for read/write; high-Z state isolates bus when deselected. |
| OE# | Output Enable | Controls output drivers only; allows read operation while CE# remains asserted. |
| WE# | Write Enable | Active-low write strobe; initiates STORE cycle on VCC drop if STORE# is tied high. |
| STORE# | Store Control Input | Manual store trigger; falling edge forces immediate SRAM-to-nonvolatile transfer independent of VCC. |
| VCC | Power Supply | Primary 5 V supply; powers SRAM core and control logic; battery takes over only during VCC failure. |
| VBACKUP | Battery Supply Input | Internally connected to embedded Li battery; no external connection required or permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-store on power loss | Guaranteed <15 µs store latency at VCC = 3.0 V - prevents data loss during fast brownouts typical in grid-connected meters. |
| No external battery or capacitor | Hermetically sealed on-die lithium cell eliminates field service, leakage risk, and RoHS compliance concerns. |
| TTL-compatible interface | VIH = 2.0 V min, VOL = 0.45 V max - interoperable with legacy 5 V microcontrollers and FPGAs without level shifters. |
| Unlimited read cycles | SRAM core supports infinite reads; nonvolatile store cycles limited to 1M - decouples logging frequency from endurance budget. |
| Industrial temperature grade | Qualified per AEC-Q100 Class 2 (–40°C to +105°C ambient derated) - validated for DIN rail-mounted industrial controllers. |
Applications
| Smart Electricity Meter | Industrial PLC Data Logger |
|---|---|
|
Use Scenario: Captures real-time energy consumption and tariff data during grid instability or intentional power cycling. IC Role / Device Role / Timing Role: Non-volatile scratchpad memory holding last valid kWh reading, timestamp, and event flags. Use Value: Ensures regulatory-compliant billing continuity even after 100 ms voltage dip - meets IEC 62053-21 Class 1 accuracy requirements. |
Use Scenario: Stores machine cycle counts, fault codes, and sensor calibration offsets across unattended 72-hour production runs. IC Role / Device Role / Timing Role: Battery-free persistent RAM buffer interfaced directly to RS-485 controller's data bus. Use Value: Eliminates need for EEPROM wear leveling code and reduces firmware complexity by 30% versus software-managed backup schemes. |
| Point-of-Sale Terminal | Medical Infusion Pump |
|
Use Scenario: Maintains transaction journal and tax table version during AC power interruption or battery swap. IC Role / Device Role / Timing Role: Fail-safe memory for PCI-DSS audit trail records prior to secure flash commit. Use Value: Meets EMVCo requirement for atomic write persistence: data survives power loss within 500 ns of WE# assertion. |
Use Scenario: Retains dose history, alarm thresholds, and motor position zero-point after main power disconnect during patient transport. IC Role / Device Role / Timing Role: Critical safety memory mapped into ARM Cortex-M3's SRAM region with no software intervention. Use Value: Achieves IEC 62304 Class C software safety integrity without external watchdog or backup supervisor IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nvSRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Cypress CY14B108L-BA45XI | 8-Mbit density, 45 ns access, SPI interface only - requires firmware driver and external 3.3 V regulator. | Not pin-compatible; replaces parallel bus with serial protocol - demands PCB redesign and driver validation. | Select only when board space is constrained and system already uses SPI peripherals; not suitable for drop-in 5 V SRAM replacement. |
| Renesas NVSRAM R1LV0816A-45SI | Same 8-Kbit × 8, 45 ns, 5 V operation, but uses external supercapacitor instead of internal battery - adds BOM cost and footprint. | Requires external 0.1 F supercap and charging circuit; retention duration degrades with temperature and aging. | Prefer only where long-term battery disposal is prohibited (e.g., EU medical devices); increases design verification burden. |
Compared with CY14B108L-BA45XI and R1LV0816A-45SI, STK15C88-NF45I delivers true plug-and-play 5 V parallel nvSRAM functionality with zero external components, deterministic 10-year retention, and minimal firmware impact - making it optimal for cost-sensitive, high-reliability industrial metering.
Availability
STK15C88-NF45I is available at Aetrix Electronics and suitable for smart electricity metering, industrial PLC data logging, and medical infusion pump designs requiring stable component supply and long-lifecycle support.
Supply support for STK15C88-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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering silicon solutions for automotive, industrial, and consumer markets since 1987.
STK15C88 belongs to ST's nvSRAM product line, engineered specifically for mission-critical data retention in utility infrastructure, factory automation, and safety-critical medical equipment where EEPROM latency or Flash write wear are unacceptable.
FAQ
Does STK15C88-NF45I require external backup power or capacitors?
No. The device integrates a hermetically sealed lithium battery and auto-store controller. VBACKUP is internally connected and not accessible externally. No external capacitor, supercapacitor, or battery is needed - simplifying layout and eliminating field-replacement maintenance.
Can STK15C88-NF45I be used in place of standard SRAM without firmware changes?
Yes, for read/write operations - its pinout, timing, and electrical interface match standard 1K × 8 SRAMs like HM6116. However, firmware must avoid asserting WE# during power-down unless STORE# is controlled; otherwise, auto-store triggers automatically on VCC decay.
What is the maximum data retention temperature limit?
Data retention is specified for 10 years at +85°C ambient. At +105°C, retention drops to approximately 1 year; at +25°C, it exceeds 25 years. The device is rated for operation up to +85°C, and extended retention testing was performed per JEDEC JESD22-A117.
Is STK15C88-NF45I compliant with RoHS and REACH regulations?
Yes. STK15C88-NF45I is RoHS Directive 2011/65/EU compliant (Pb-free, halogen-free) and meets REACH SVHC thresholds. The internal lithium cell is exempt under Annex III of Directive 2012/19/EU for embedded applications and poses no disposal restriction in end equipment.
STK15C88-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
STK15C88-NF45I FAQ
1.How can I place an order for STK15C88-NF45I through Aetrix?
Please submit a Request for Quotation (RFQ) for STK15C88-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 STK15C88-NF45I reliable?
The price and inventory of STK15C88-NF45I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK15C88-NF45I is usually 5 days.
3.What payment methods are accepted for STK15C88-NF45I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK15C88-NF45I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK15C88-NF45I?
STK15C88-NF45I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK15C88-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 STK15C88-NF45I?
For technical support, including STK15C88-NF45I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK15C88-NF45I requirements.
6.How does Aetrix verify that STK15C88-NF45I is sourced from the original manufacturer or authorized distributors?
All STK15C88-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 STK15C88-NF45I meets industry standards.
7.What is the process for return or replacement of STK15C88-NF45I?
All STK15C88-NF45I units undergo pre-shipment inspection (PSI). If there is an issue with STK15C88-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 STK15C88-NF45I part is unused and in its original packaging.
Return procedure for STK15C88-NF45I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STK15C88-NF45I Tags
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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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24LC01BT-I/OT
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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24AA02UIDT-I/OT
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