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Infineon Technologies STK22C48-SF25I
- Part No.:
- STK22C48-SF25I
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
STK22C48-SF25I.pdf
- Description:
- IC NVSRAM 16KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,156
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Product details
Overview
STK22C48-SF25I 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 to nonvolatile elements on power-down using an external 68 µF capacitor, supports hardware STORE via HSB pin, and guarantees 100-year data retention. Used in industrial control modules requiring persistent memory without battery backup.
For engineers reviewing the STK22C48-SF25I datasheet, STK22C48-SF25I pinout, STK22C48-SF25I application, or STK22C48-SF25I equivalent, key selection criteria include AutoStore timing behavior, VCAP capacitor sizing, HSB-driven STORE arbitration, and compatibility with 28-pin SOIC footprint in legacy 5 V 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), by software command, or via HSB pin assertion - 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 ≤ 10 ms. During STORE or RECALL, SRAM read/write is inhibited; HSB pin acts as open-drain busy indicator with internal pull-up, requiring external 10 kΩ pull-up to VCAP when used as output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 16 Kbit (2 K × 8), directly addressable via A0–A10 for byte-level access |
| Access time | 25 ns - defines minimum cycle time for reliable read/write in high-speed 5 V bus systems |
| STORE endurance | 1,000,000 cycles - limits total nonvolatile write operations over product lifetime |
| Data retention | 100 years - guaranteed nonvolatile data hold time at industrial temperature range |
| Supply voltage | 5 V ±10% - requires stable 4.5–5.5 V rail; no dual-supply or voltage scaling support |
| VCAP capacitor | 68 µF ±20%, 6 V rated - supplies energy for single STORE during power loss |
| Operating temperature | –40°C to +85°C - validated for industrial ambient conditions without derating |
Pinout & Package
STK22C48-SF25I is housed in a 28-pin 300-mil Small Outline Integrated Circuit (SOIC) package with standard gull-wing leads and RoHS-compliant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A10 | Address input | 11-bit address bus selecting one of 2,048 SRAM locations |
| DQ0–DQ7 | Bidirectional data I/O | 8-bit parallel data path; tri-stated when OE HIGH or during STORE/RECALL |
| WE | Write enable | Active-low control; initiates SRAM write when CE LOW and HSB HIGH |
| CE | Chip enable | Active-low chip select; disables device and reduces standby current when HIGH |
| OE | Output enable | Active-low control for output buffers; must be HIGH during writes to prevent bus contention |
| HSB | Hardware Store Busy | Open-drain status pin: driven LOW during STORE; pulled LOW externally to initiate hardware STORE |
| VCAP | AutoStore capacitor terminal | Connects to external 68 µF storage capacitor; powers STORE operation during VCC collapse |
| VCC | Power supply | +5 V ±10% main supply; powers SRAM and logic; disconnects from VCAP at VSWITCH threshold |
| VSS | Ground | System reference ground; must be low-impedance connection for noise immunity |
| NC | No connect | Pins 27 and 28 are unconnected internally; must remain floating or grounded per layout rules |
Key Features
| Feature | Design Value |
|---|---|
| AutoStore on power-down | Eliminates need for external supervision circuitry or battery backup by autonomously initiating STORE when VCC drops below 3.6 V |
| QuantumTrap nonvolatile cell | Enables 100-year data retention and 1M STORE cycles without wear leveling or ECC overhead |
| HSB-controlled STORE arbitration | Prevents conflict between ongoing SRAM writes and STORE initiation by delaying STORE until tDELAY (≥20 ns) after HSB assertion |
| Hardware write protection | Inhibits SRAM writes and STORE when VCC < VSWITCH, preventing corruption during brown-out or power ramp |
| Unlimited SRAM read/write cycles | Supports continuous logging or buffer operations without endurance limitation - unlike Flash or EEPROM |
Applications
| Industrial PLC Data Logging | Medical Device Parameter Storage |
|---|---|
Use Scenario: Retaining real-time sensor calibration values and fault history across unexpected AC mains loss in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile SRAM providing immediate-access scratchpad memory with guaranteed STORE on power failure. Use Value: Eliminates supercapacitor charging circuitry and avoids battery replacement maintenance while preserving last-known state within 10 ms. | Use Scenario: Storing user-configured therapy parameters and usage counters in portable infusion pumps subject to frequent battery swaps. IC Role / Device Role / Timing Role: Persistent memory holding critical treatment settings that must survive power cycling without delay or checksum validation. Use Value: Enables instant resume after battery change with zero boot-time latency and no firmware-initiated recall sequence required. |
| Avionics Black Box Buffer | Test Equipment Configuration Memory |
Use Scenario: Capturing flight-critical telemetry snapshots in aircraft data acquisition units where power interruption may occur during turbulence or engine start. IC Role / Device Role / Timing Role: High-reliability nvSRAM acting as crash-proof ring buffer with deterministic STORE timing under rapid VCC collapse. Use Value: Guarantees capture of final 2 KB of operational data even during sub-100 ms power dropout, meeting DO-160 Section 20 transient requirements. | Use Scenario: Holding instrument-specific calibration coefficients and test sequence definitions in automated benchtop testers undergoing daily power cycles. IC Role / Device Role / Timing Role: Configuration memory retaining setup data across cold starts without requiring host CPU intervention or boot ROM loading. Use Value: Reduces test setup time by 1.2 seconds per session by eliminating configuration reload from external Flash or EEPROM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY14B101PA-SXIT | 1-Mbit nvSRAM with 45 ns access, SPI interface option, integrated VCAP charge pump, no HSB pin | Requires SPI-to-parallel bridge for legacy parallel bus systems; lacks hardware STORE arbitration | Select when migrating to higher density and lower system-level component count, accepting SPI integration effort |
| FM24CL16B-G | 16-Kbit F-RAM with 55 ns access, no VCAP capacitor, unlimited STORE endurance, 3.3 V only | Eliminates external capacitor but incompatible with 5 V bus; no AutoStore power-loss detection logic | Select when 3.3 V design allows removal of VCAP circuitry and STORE frequency exceeds 1M cycles/year |
Compared with CY14B101PA-SXIT and FM24CL16B-G, STK22C48-SF25I uniquely delivers deterministic 25 ns parallel access, hardware-managed STORE arbitration via HSB, and full 5 V compatibility - making it irreplaceable in legacy industrial controllers where timing, voltage, and pinout constraints are fixed.
Availability
STK22C48-SF25I 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-SF25I 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 systems.
The STK22C48 belongs to Cypress's AutoStore nvSRAM product line, engineered specifically for mission-critical applications needing instant-on nonvolatility without batteries, capacitors, or firmware overhead.
FAQ
What is the minimum VCAP capacitor value required for reliable AutoStore operation?
The STK22C48-SF25I requires a minimum 68 µF ±20% tantalum or polymer capacitor rated for 6 V. Values below this threshold risk incomplete STORE execution during rapid VCC collapse, especially at high temperature or with heavy load on VCAP. Digi-Key P/N TAJR686M006RNJ and Mouser P/N 647-TAJR686M006RNJ meet specification.
Can STK22C48-SF25I 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 concerns but removes hands-off power-loss protection.
Is STK22C48-SF25I compatible with 3.3 V systems?
No. STK22C48-SF25I is specified only for 5 V ±10% operation (4.5–5.5 V). Attempting 3.3 V operation results in undefined behavior, failed STORE/RECALL, and potential data corruption. For 3.3 V designs, consider FM24CL16B-G or CY14B101PA-SXIT.
How does the STK22C48 handle concurrent SRAM access and STORE request?
When HSB is asserted LOW, the STK22C48 completes any active SRAM read/write within tDELAY (≥20 ns), then inhibits new accesses until STORE finishes. Ongoing writes are allowed to complete; subsequent writes are blocked until HSB returns HIGH, ensuring data coherency without bus lockup.
STK22C48-SF25I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 28-SOIC (0.342", 8.69mm Width)
- Packaging:
- Tube
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
STK22C48-SF25I FAQ
1.How can I place an order for STK22C48-SF25I through Aetrix?
Please submit a Request for Quotation (RFQ) for STK22C48-SF25I 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-SF25I reliable?
The price and inventory of STK22C48-SF25I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK22C48-SF25I is usually 5 days.
3.What payment methods are accepted for STK22C48-SF25I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK22C48-SF25I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK22C48-SF25I?
STK22C48-SF25I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK22C48-SF25I 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-SF25I?
For technical support, including STK22C48-SF25I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK22C48-SF25I requirements.
6.How does Aetrix verify that STK22C48-SF25I is sourced from the original manufacturer or authorized distributors?
All STK22C48-SF25I 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-SF25I meets industry standards.
7.What is the process for return or replacement of STK22C48-SF25I?
All STK22C48-SF25I units undergo pre-shipment inspection (PSI). If there is an issue with STK22C48-SF25I, 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-SF25I part is unused and in its original packaging.
Return procedure for STK22C48-SF25I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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