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Infineon Technologies STK17TA8-RF25I
- Part No.:
- STK17TA8-RF25I
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
STK17TA8-RF25I.pdf
- Description:
- IC NVSRAM 1MBIT PARALLEL 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,305
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Product details
Overview
STK17TA8-RF25I from Cypress Semiconductor is a 128k × 8 (1 Mb) nonvolatile SRAM with integrated real-time clock, watchdog timer, alarm, and power monitor. It operates from a single 3.0 V ±10% supply, delivers 25 ns read access time, supports automatic STORE on power loss and RECALL on power-up, and uses a 48-pin SSOP package for industrial temperature range (–40°C to +85°C).
For engineers reviewing the STK17TA8-RF25I datasheet, STK17TA8-RF25I pinout, STK17TA8-RF25I application, or STK17TA8-RF25I equivalent, key selection criteria include nvSRAM endurance (unlimited read/write), RTC accuracy with leap-year support, hardware/software STORE/RECALL control, and dual backup options (capacitor or battery for RTC).
Technical Context
The STK17TA8-RF25I integrates a quantum-trap-based nvSRAM array (1024 × 1024) with a fully featured RTC subsystem including programmable alarm (minutes/hours/days), 16-bit watchdog timer, and voltage-monitoring interrupt capability. All RTC registers are memory-mapped within the same 17-bit address space as the SRAM.
STORE operation transfers SRAM contents to nonvolatile elements in ≤20 ms using charge stored on the VCAP capacitor; RECALL restores data in <100 μs at power-on. The RTC oscillator uses an external 32.768 kHz crystal connected to X1/X2, with factory-calibrated accuracy and software calibration support.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 128k × 8 (1 Mb) nvSRAM with unlimited read/write cycles |
| Access Time | 25 ns (STK17TA8-25 variant); enables fast microcontroller interfacing without wait states |
| RTC Accuracy | ±2 ppm typical at 25°C with 32.768 kHz crystal; supports leap-year correction |
| Data Retention | 20 years at 55°C; guaranteed nonvolatile storage without refresh |
| Backup Options | Dual-mode RTC backup: VRTCcap (capacitor) or VRTCbat (battery); mutually exclusive connection |
| Power Supply | Single 3.0 V ±10%; eliminates need for auxiliary voltage rails |
| Operating Temp | –40°C to +85°C; qualified for industrial embedded systems |
Pinout & Package
Package: 48-pin 300-mil SSOP (RoHS-compliant), 11.4 mm × 15.4 mm footprint, thermal resistance θja = 41.8°C/W at 500 fpm airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A16–A0 | Address Input | 17-bit address bus selecting one of 131,072 SRAM bytes or 16 RTC register locations |
| DQ7–DQ0 | Bi-directional Data Bus | 8-bit I/O path shared between nvSRAM and RTC register map; tristatable via G |
| E, W, G | Control Inputs | Chip Enable (active-low), Write Enable (active-low), Output Enable (active-low) - standard SRAM timing interface |
| HSB | Hardware Store Busy | Open-drain status output indicating active STORE; also serves as hardware trigger when pulled low |
| INT | Programmable Interrupt | Configurable active-high push-pull or active-low open-drain output for alarm/watchdog/power events |
| X1/X2 | Crystal Oscillator Interface | Drives 32.768 kHz tuning-fork crystal; internal oscillator circuit includes startup delay compensation |
| VCAP | Autostore Capacitor Terminal | Connects to ≥17 μF (5 V rated) capacitor to sustain STORE during VCC dropout |
| VRTCcap / VRTCbat | RTC Backup Supply | Mutually exclusive inputs: capacitor-backed (VRTCcap) or battery-backed (VRTCbat) RTC power domain |
Key Features
| Feature | Design Value |
|---|---|
| AutoStore™ on Power Loss | Automatic nonvolatile STORE triggered by VCC drop below threshold; no firmware intervention required |
| Software-Controlled STORE/RECALL | Full STORE/RECALL execution via register writes - enables deterministic data persistence in critical sequences |
| RTC Register Map Integration | 16-byte clock/alarm/watchdog/flag registers mapped into same address space as SRAM; no separate I²C/SPI interface needed |
| Watchdog Timer with Reset Control | 16-bit programmable watchdog with interrupt-only or reset+interrupt modes; independent of main SRAM operation |
| Power Monitor Interrupt | Detects VCC brown-out and asserts INT before STORE initiation - provides early warning for system-level response |
Applications
| Industrial Data Logger | Medical Device Memory |
|---|---|
|
Use Scenario: Battery-powered portable ECG recorder capturing waveform data during intermittent operation. IC Role / Device Role / Timing Role: nvSRAM stores raw sensor samples; RTC timestamps each acquisition with calendar date and millisecond precision. Use Value: Ensures timestamped data integrity across power cycles without external FRAM or EEPROM, reducing BOM count and PCB area. |
Use Scenario: Infusion pump controller requiring audit-trail logging of dosage history and fault events. IC Role / Device Role / Timing Role: Stores event logs with precise timestamps; watchdog monitors CPU liveness and triggers safe shutdown if unresponsive. Use Value: Meets IEC 62304 traceability requirements via atomic STORE/RECALL and tamper-resistant RTC calendar. |
| Smart Meter Firmware Storage | PLC Configuration Memory |
|
Use Scenario: Electricity meter retaining tariff tables, consumption counters, and firmware patches across grid outages. IC Role / Device Role / Timing Role: nvSRAM holds configuration and runtime variables; RTC maintains billing-period boundaries and DST transitions. Use Value: Eliminates need for external backup battery and discrete RTC, simplifying certification for EN 13757-3 and ANSI C12.1. |
Use Scenario: Programmable logic controller storing ladder logic state and I/O mapping after firmware updates. IC Role / Device Role / Timing Role: Provides nonvolatile storage for volatile program state; alarm function schedules periodic diagnostics. Use Value: Enables zero-downtime field upgrades with guaranteed state recovery - no risk of corrupted logic due to unexpected power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nvSRAM + RTC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STK17TA8-RF45I | 45 ns access time; higher ICC1 (70 mA vs. 65 mA at 25 ns); identical pinout and feature set | Suitable where timing margin allows slower access; lower cost in high-volume industrial designs | Select for cost-sensitive applications with relaxed timing budgets; retains full STORE/RECALL and RTC functionality |
| DS1248-120+ from Analog Devices | 120 ns access time; uses lithium battery backup (non-RoHS); no watchdog timer; separate RTC register addressing | Legacy replacement only; lacks software-controlled STORE and integrated alarm/wdog features | Consider only for direct drop-in replacements in legacy designs; not recommended for new designs due to battery dependency and missing features |
Compared with STK17TA8-RF25I, the RF45I offers identical functionality at reduced speed and cost, while the DS1248-120+ lacks modern features like AutoStore control and integrated watchdog - making the STK17TA8-RF25I superior for new industrial and medical designs requiring reliability and flexibility.
Availability
STK17TA8-RF25I is available at Aetrix Electronics and suitable for industrial data loggers, medical device memory, smart meter firmware storage, and PLC configuration memory requiring stable component supply and long-term lifecycle support.
Supply support for STK17TA8-RF25I 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) designs high-reliability mixed-signal ICs for industrial, automotive, and communications infrastructure markets.
The STK17TA8 product line delivers monolithic nvSRAM+RTC solutions targeting applications needing deterministic nonvolatile storage, precise timekeeping, and fail-safe data retention without external components.
FAQ
What is the minimum VCAP capacitance required for reliable AutoStore operation?
The datasheet specifies a minimum VCAP capacitance of 17 μF (5 V rated) between VCAP and VSS. This value ensures sufficient energy to complete the STORE operation within the specified tSTORE duration under worst-case VCC dropout conditions at maximum junction temperature. Using less capacitance risks incomplete STORE and data loss.
Can the RTC operate independently while the nvSRAM is in standby mode?
Yes. The RTC continues running from VRTCcap or VRTCbat even when VCC is absent or the nvSRAM is in standby (E, W, G held inactive). The RTC oscillator draws only ≤350 nA in industrial grade, enabling multi-year operation on a small backup capacitor or coin cell without affecting SRAM state.
How does the HSB pin function during a hardware-initiated STORE?
When HSB is externally pulled low, it initiates a hardware STORE cycle. During execution, HSB remains low to signal busy status. Once STORE completes, HSB returns high. If HSB is left unconnected, its internal weak pull-up holds it high - preventing unintended STORE triggers.
Is the STK17TA8-RF25I compatible with 5 V logic interfaces?
No. The STK17TA8-RF25I is strictly a 3.0 V ±10% device. Its input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and output drive levels (VOH = 2.4 V @ –2 mA) are incompatible with 5 V TTL or CMOS logic. Level-shifting is required for interfacing with 5 V microcontrollers or FPGAs.
STK17TA8-RF25I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 48-BSSOP (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:
- 1Mbit
- Memory Organization:
- 128K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 25ns
- Access Time:
- 25 ns
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
STK17TA8-RF25I FAQ
1.How can I place an order for STK17TA8-RF25I through Aetrix?
Please submit a Request for Quotation (RFQ) for STK17TA8-RF25I 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 STK17TA8-RF25I reliable?
The price and inventory of STK17TA8-RF25I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK17TA8-RF25I is usually 5 days.
3.What payment methods are accepted for STK17TA8-RF25I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK17TA8-RF25I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK17TA8-RF25I?
STK17TA8-RF25I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK17TA8-RF25I 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 STK17TA8-RF25I?
For technical support, including STK17TA8-RF25I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK17TA8-RF25I requirements.
6.How does Aetrix verify that STK17TA8-RF25I is sourced from the original manufacturer or authorized distributors?
All STK17TA8-RF25I 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 STK17TA8-RF25I meets industry standards.
7.What is the process for return or replacement of STK17TA8-RF25I?
All STK17TA8-RF25I units undergo pre-shipment inspection (PSI). If there is an issue with STK17TA8-RF25I, 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 STK17TA8-RF25I part is unused and in its original packaging.
Return procedure for STK17TA8-RF25I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STK17TA8-RF25I Tags
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