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Infineon Technologies STK22C48-NF25TR
- Part No.:
- STK22C48-NF25TR
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
STK22C48-NF25TR.pdf
- Description:
- IC NVSRAM 16KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,923
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Product details
Overview
STK22C48-NF25TR from Cypress Semiconductor is a 16-Kbit (2 K × 8) nonvolatile SRAM with AutoStore™ and QuantumTrap™ technology, operating at 25 ns access time on single 5 V ±10% supply. It performs automatic STORE on power-down using an external 68 µF capacitor on VCAP, supports hardware STORE via HSB pin, and guarantees 100-year data retention and 1 million STORE cycles. Used in industrial control modules requiring persistent memory without battery backup.
For engineers reviewing the STK22C48-NF25TR datasheet, STK22C48-NF25TR pinout, STK22C48-NF25TR application, or STK22C48-NF25TR equivalent, key selection criteria include AutoStore timing behavior, VCAP capacitor sizing, HSB-driven STORE arbitration, and compatibility with legacy 28-pin SOIC-based memory interfaces in brown-out-prone systems.
Technical Context
The STK22C48 integrates parallel SRAM and QuantumTrap nonvolatile cells per bit, enabling simultaneous STORE/RECALL of all 2,048 bytes. STORE is triggered automatically at VCC < VSWITCH (≈3.6 V), conditionally by HSB assertion, or via software sequence - but only if at least one write occurred since last STORE/RECALL.
RECALL occurs automatically on power-up when VCC exceeds VSWITCH, completing in tHRECALL ≤ 11 ms. During STORE or RECALL, SRAM read/write is inhibited; HSB acts as open-drain busy indicator, pulled low for duration of operation and requiring external 10 kΩ pull-up to VCAP when used.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 16 Kbit (2 K × 8); supports byte-wide interface with full addressability across A0–A10. |
| Access time | 25 ns; defines maximum clock-to-data valid delay in high-speed SRAM read cycles. |
| STORE endurance | 1,000,000 cycles; limits total nonvolatile write operations before QuantumTrap wear-out. |
| Data retention | 100 years at T ≤ 85°C; specifies guaranteed nonvolatile data hold without refresh or power. |
| VCAP capacitor | 68 µF ±20%, 6 V rated; supplies energy for single STORE during VCC collapse. |
| Operating voltage | 5 V ±10% (4.5–5.5 V); defines valid VCC range for SRAM operation and STORE initiation logic. |
| Temperature range | Industrial: –40°C to +85°C; ensures reliable STORE/RECALL timing and data integrity across thermal stress. |
Pinout & Package
28-pin 300-mil Small Outline Integrated Circuit (SOIC) package with gull-wing leads, RoHS compliant, body width 7.6 mm, lead pitch 1.27 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A10 | Address input | Selects one of 2,048 memory locations; latched on CE/WE/OE transitions. |
| DQ0–DQ7 | Bidirectional data I/O | Tri-stated when OE HIGH or during STORE/RECALL; shares pins for read and write. |
| WE | Write enable (active LOW) | Controls write latch timing; must be stable before and during write cycle. |
| CE | Chip enable (active LOW) | Enables device decoding; deassertion forces outputs to high-impedance state. |
| OE | Output enable (active LOW) | Activates output drivers during read; must be HIGH during write to prevent bus contention. |
| HSB | Hardware Store Busy | Open-drain status signal: LOW = STORE in progress; driven LOW externally to initiate STORE. |
| VCAP | AutoStore capacitor supply | Connects to external 68 µF capacitor; powers internal STORE circuitry during VCC loss. |
| VCC | Primary power supply | 5 V ±10% main supply; powers SRAM core and control logic; drops below VSWITCH triggers AutoStore. |
| VSS | Ground reference | System ground return path; required for noise margin and logic threshold stability. |
| NC | No connect | Unbonded die pad; must remain unconnected to avoid parasitic coupling or ESD risk. |
Key Features
| Feature | Design Value |
|---|---|
| AutoStore on power-down | Eliminates need for external supervisor IC or battery; uses stored VCAP charge for autonomous STORE at VCC collapse. |
| QuantumTrap nonvolatile cell | Enables 100-year data retention and 1M STORE cycles without wear leveling or ECC overhead. |
| HSB-controlled STORE arbitration | Prevents STORE during active SRAM writes by delaying initiation until tDELAY expires, ensuring data consistency. |
| Hardware data protection | Inhibits STORE and write operations when VCC < VSWITCH (≈3.6 V), preventing corruption during brown-out. |
| Parallel STORE/RECALL architecture | Transfers all 2,048 bytes simultaneously-no sequential addressing or page management required. |
Applications
| Industrial PLC Data Logging | Medical Device Parameter Storage |
|---|---|
Use Scenario: Retaining real-time sensor calibration values and alarm thresholds during unexpected AC power loss in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile SRAM providing immediate-access storage with deterministic STORE latency (<11 ms) and zero software intervention. Use Value: Eliminates supercapacitor charging circuitry and firmware SAVE routines, reducing BOM count and boot-time initialization delays. | Use Scenario: Preserving therapy settings and usage history in portable infusion pumps subject to frequent battery swaps and short interruptions. IC Role / Device Role / Timing Role: Persistent memory element that recalls critical configuration on power-up within tHRECALL ≤ 11 ms, before MCU firmware initializes. Use Value: Ensures regulatory-compliant state recovery without relying on volatile RAM backup or external EEPROM write cycles. |
| Avionics Black Box Buffer | Energy Meter Firmware State Backup |
Use Scenario: Capturing flight-critical telemetry snapshots during transient voltage sags in airborne data acquisition units. IC Role / Device Role / Timing Role: High-reliability nvSRAM interfacing directly to ADC FIFO controller; STORE triggered by HSB under flight control software command. Use Value: Achieves MIL-STD-704F compliance for voltage sag immunity without adding watchdog timers or secondary power rails. | Use Scenario: Maintaining tariff schedules, billing counters, and tamper logs in smart electricity meters exposed to grid instability. IC Role / Device Role / Timing Role: Primary nonvolatile storage for metering registers; AutoStore activated by VCAP discharge during mains dropout. Use Value: Meets IEC 62056-21 data integrity requirements with no firmware involvement and guaranteed 100-year retention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY14B101PA-SP25XI | 256 Kbit (32 K × 8), 25 ns, SPI interface, integrated VCAP switch; requires SPI host driver. | Replaces parallel bus with serial interface; reduces pin count but increases firmware dependency. | Choose for space-constrained designs where MCU has SPI and can manage STORE sequencing. |
| FM24CL16B-G | 16 Kbit F-RAM, 45 ns, I²C interface, unlimited endurance, no VCAP capacitor needed. | Eliminates STORE timing uncertainty and capacitor aging concerns; lacks AutoStore trigger on VCC drop. | Choose when deterministic STORE timing is less critical than infinite write cycles and simplified layout. |
Compared with CY14B101PA-SP25XI and FM24CL16B-G, STK22C48-NF25TR uniquely delivers parallel-byte access, hardware-triggered AutoStore without firmware, and guaranteed 100-year retention - making it optimal for legacy industrial systems requiring drop-in replacement of standard SRAM with nonvolatile persistence.
Availability
STK22C48-NF25TR is available at Aetrix Electronics and suitable for industrial PLC data logging, medical device parameter storage, and avionics black box buffer applications requiring stable component supply and long-term lifecycle support.
Supply support for STK22C48-NF25TR 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 memory and programmable solutions for industrial, automotive, and communications markets.
The STK22C48 belongs to Cypress's AutoStore nvSRAM product line, engineered specifically for systems needing instant-on nonvolatile memory with zero software overhead and immunity to power interruption.
FAQ
What is the minimum VCAP capacitance required for reliable AutoStore operation?
The STK22C48-NF25TR requires a minimum 68 µF capacitor on VCAP, rated at 6 V with ±20% tolerance. Capacitance below this value may cause incomplete STORE due to insufficient energy for full 2,048-byte transfer. Ceramic or tantalum types are discouraged; use low-ESR aluminum electrolytic or polymer capacitors with verified ripple current rating.
Can STK22C48-NF25TR operate without the VCAP capacitor?
Yes - in AutoStore Inhibit mode: tie VCC to ground and apply +5 V directly to VCAP. In this configuration, AutoStore is disabled and STORE is initiated only via HSB pin or software command. This eliminates capacitor aging and leakage concerns but removes automatic power-loss response.
How does the STK22C48 handle concurrent SRAM access and STORE request?
When HSB is asserted LOW, the STK22C48 completes any ongoing SRAM read/write within tDELAY (≤100 ns), then inhibits new accesses until STORE finishes. During STORE, DQ lines go high-Z and address/data inputs are ignored - ensuring atomicity without external arbitration logic.
Is STK22C48-NF25TR compatible with 3.3 V systems?
No - it is specified only for 5 V ±10% (4.5–5.5 V) operation. Attempting 3.3 V supply violates VSWITCH threshold and prevents reliable AutoStore triggering. For 3.3 V systems, consider Infineon's newer nvSRAM families like CY14V101L, which support dual-voltage operation and integrated power-switching.
STK22C48-NF25TR 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:
- 16Kbit
- Memory Organization:
- 2K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 25ns
- Access Time:
- 25 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
STK22C48-NF25TR FAQ
1.How can I place an order for STK22C48-NF25TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STK22C48-NF25TR 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 STK22C48-NF25TR reliable?
The price and inventory of STK22C48-NF25TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK22C48-NF25TR is usually 5 days.
3.What payment methods are accepted for STK22C48-NF25TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK22C48-NF25TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK22C48-NF25TR?
STK22C48-NF25TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK22C48-NF25TR 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 STK22C48-NF25TR?
For technical support, including STK22C48-NF25TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK22C48-NF25TR requirements.
6.How does Aetrix verify that STK22C48-NF25TR is sourced from the original manufacturer or authorized distributors?
All STK22C48-NF25TR 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 STK22C48-NF25TR meets industry standards.
7.What is the process for return or replacement of STK22C48-NF25TR?
All STK22C48-NF25TR units undergo pre-shipment inspection (PSI). If there is an issue with STK22C48-NF25TR, 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 STK22C48-NF25TR part is unused and in its original packaging.
Return procedure for STK22C48-NF25TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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