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Infineon Technologies STK22C48-SF45
- Part No.:
- STK22C48-SF45
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
STK22C48-SF45.pdf
- Description:
- IC NVSRAM 16KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,065
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Product details
Overview
STK22C48-SF45 from Cypress Semiconductor is a 16-Kbit (2 K × 8) nonvolatile SRAM with AutoStore™ functionality, integrating QuantumTrap™ nonvolatile storage in each memory cell. It operates at 5 V ±10%, delivers 45 ns access time, supports hardware STORE via HSB pin, and enables automatic data retention for 100 years after power loss - used in industrial PLCs for real-time parameter backup during brownout events.
For engineers reviewing the STK22C48-SF45 datasheet, STK22C48-SF45 pinout, STK22C48-SF45 application, or STK22C48-SF45 equivalent, key selection criteria include AutoStore timing dependency on VCAP capacitor value, HSB-driven STORE arbitration logic, RECALL latency at power-up, and compatibility with legacy 28-pin SOIC-based memory interfaces in embedded control systems.
Technical Context
The STK22C48-SF45 implements a dual-cell architecture: a standard fast SRAM array (32 × 512) paired with parallel QuantumTrap nonvolatile elements. STORE transfers data from SRAM to nonvolatile cells either automatically on VCC drop below VSWITCH (with external 68 µF VCAP capacitor), via software command, or by pulling HSB LOW - all requiring prior write activity since last STORE/RECALL.
RECALL restores data unconditionally at power-up when VCC exceeds VSWITCH, completing in tHRECALL ≤ 15 ms. During STORE or RECALL, SRAM read/write is inhibited; HSB serves as both initiation input and open-drain busy indicator, pulled low internally during active STORE cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 16 Kbit (2 K × 8), directly addressable via A0–A10 for deterministic byte-level access |
| Access time | 45 ns - defines maximum clock-to-data valid delay in high-speed control loop buffers |
| Nonvolatile endurance | 1,000,000 STORE cycles - limits field-replaceable unit lifetime in cyclic logging applications |
| Data retention | 100 years at +25°C - guarantees firmware configuration persistence across product service life |
| VCAP capacitor | 68 µF ±20% - minimum required charge reservoir to sustain full STORE operation during VCC collapse |
| Operating voltage | 5.0 V ±10% - mandates compatible LDO regulation and eliminates need for level-shifting in 5 V legacy systems |
| Temperature range | Industrial: –40°C to +85°C - validated for deployment in motor drive cabinets and outdoor metering enclosures |
Pinout & Package
STK22C48-SF45 is housed in a 28-pin 300-mil Small Outline Integrated Circuit (SOIC) package with gull-wing leads, RoHS-compliant finish, and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A10 | Address inputs | Select one of 2,048 memory locations; stable before CE/WE assertion for reliable write setup |
| DQ0–DQ7 | Bidirectional data I/O | Shared bus interface; tri-stated when OE HIGH or during STORE/RECALL to prevent contention |
| WE | Write enable | Active-low control; must remain LOW for full write cycle duration to latch data into SRAM |
| CE | Chip enable | Active-low global select; disables internal circuitry and reduces ICC when HIGH |
| OE | Output enable | Active-low output buffer control; keeps DQ lines high-impedance during writes or standby |
| HSB | Hardware Store Busy | Open-drain status/output; driven LOW during STORE to signal system hold-off; requires 10 kΩ pull-up to VCAP if used |
| VCAP | AutoStore capacitor supply | Connects to external 68 µF capacitor; supplies energy for STORE when VCC drops below VSWITCH ≈ 3.6 V |
| VCC | Power supply | +5 V ±10% main supply; powers SRAM and logic; decoupled with 0.1 µF ceramic capacitor near pin |
| VSS | Ground | System reference return path; must be low-inductance connection to minimize noise coupling |
| NC | No connect | Pins 27 and 28 are unconnected die pads; left floating or tied to ground per board layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| AutoStore on power-down | Eliminates external supervisor IC and firmware intervention for critical data save during unexpected power loss |
| QuantumTrap nonvolatile cell | Enables parallel STORE/RECALL across all 2 K bytes without sequential addressing overhead |
| HSB-controlled STORE arbitration | Prevents conflict between concurrent SRAM writes and STORE initiation via tDELAY timing window |
| Hardware write protection | Automatically inhibits WE-driven writes when VCC < VSWITCH, preventing corruption during brownout |
| Unlimited SRAM read/write cycles | Supports continuous real-time data buffering in telemetry gateways without wear-out concerns |
Applications
| Industrial PLC Parameter Backup | Medical Device Configuration Storage |
|---|---|
Use Scenario: Retaining calibration coefficients and alarm thresholds across power cycles in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Nonvolatile SRAM providing immediate-access parameter storage with guaranteed recall within 15 ms of power restoration. Use Value: Eliminates battery-backed RAM maintenance and avoids EEPROM write-latency delays during runtime updates. | Use Scenario: Preserving user-defined therapy settings and device serial history in portable infusion pumps. IC Role / Device Role / Timing Role: Fail-safe memory element ensuring regulatory-compliant data persistence without external energy sources. Use Value: Meets IEC 62304 Class C software requirements for nonvolatile state retention after unplanned shutdown. |
| Smart Meter Firmware Patch Buffer | Avionics Data Logger Snapshot Memory |
Use Scenario: Staging over-the-air firmware patches in utility meters before atomic commit to flash. IC Role / Device Role / Timing Role: High-cycle SRAM with embedded nonvolatile backup enabling safe patch rollback on update failure. Use Value: Reduces risk of bricking during field upgrades by retaining pre-update image in quantum-trapped cells. | Use Scenario: Capturing transient flight sensor data during power interruption in black box recorders. IC Role / Device Role / Timing Role: Zero-latency memory snapshot device triggered by voltage monitor asserting HSB on VCC dip. Use Value: Guarantees capture of last 2 KB of inertial measurement data even during generator failure. |
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 capacity, SPI interface, 25 MHz max clock, no HSB pin, uses internal capacitor | Requires SPI host controller integration; lacks parallel bus compatibility and hardware STORE signaling | Select when migrating to higher density and space-constrained designs where serial interface is acceptable |
| FM24CL64-G | F-RAM technology, 64 Kbit, I²C interface, unlimited endurance, no VCAP capacitor needed | Lower write latency but incompatible pinout and protocol; no AutoStore power-loss trigger mechanism | Choose for ultra-high-write-cycle applications where deterministic STORE timing is not required |
Compared with CY14B101PA-SP25XI and FM24CL64-G, STK22C48-SF45 uniquely provides parallel 8-bit bus compatibility, explicit HSB-driven STORE control, and proven AutoStore behavior with discrete VCAP - making it irreplaceable in legacy 28-pin SOIC-based industrial control boards requiring deterministic power-loss response.
Availability
STK22C48-SF45 is available at Aetrix Electronics and suitable for industrial PLCs, medical infusion pumps, and smart electricity meters requiring stable component supply amid long product lifecycles and obsolescence-sensitive designs.
Supply support for STK22C48-SF45 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) is a U.S.-based semiconductor company specializing in memory, microcontrollers, and programmable solutions for industrial and automotive markets.
The STK22C48 belongs to Cypress's nvSRAM product line, engineered specifically for systems needing instant-on memory with fail-safe data retention - targeting applications where battery backup is impractical and EEPROM latency is unacceptable.
FAQ
What is the minimum VCAP capacitor value required for reliable AutoStore operation?
The STK22C48-SF45 requires a minimum 68 µF ±20% tantalum or polymer capacitor rated for 6 V on the VCAP pin. This value ensures sufficient stored energy to complete the full STORE cycle within 10 ms when VCC drops below VSWITCH (≈3.6 V). Using less capacitance risks incomplete STORE and data loss; values up to 220 µF are supported for extended hold-up time.
Can STK22C48-SF45 operate without the VCAP capacitor?
Yes - in AutoStore Inhibit mode, where VCC is tied to ground and +5 V is applied directly to VCAP. In this configuration, AutoStore is disabled and STORE operations occur only via software command or HSB pin assertion. The device functions as a standard SRAM with nonvolatile backup initiated solely under controlled conditions, eliminating capacitor aging and leakage concerns.
How does the HSB pin behave during a STORE cycle?
HSB acts as an open-drain output that is actively driven LOW by the STK22C48-SF45 throughout the entire STORE operation - whether initiated by power-down, software, or HSB assertion. An external 10 kΩ pull-up resistor to VCAP is required if using HSB for system synchronization. The pin remains LOW until STORE completes, then releases to HIGH, signaling readiness for next operation.
Is STK22C48-SF45 suitable for new designs?
No - Cypress explicitly marks STK22C48 as "Not Recommended for New Designs." It remains in production solely to support ongoing manufacturing programs. For new projects, Infineon recommends migration paths such as the CY14B series or F-RAM alternatives, though STK22C48-SF45 continues to be stocked and supported for legacy system repair, replacement, and lifecycle extension.
STK22C48-SF45 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:
- 45ns
- Access Time:
- 45 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-SF45 FAQ
1.How can I place an order for STK22C48-SF45 through Aetrix?
Please submit a Request for Quotation (RFQ) for STK22C48-SF45 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-SF45 reliable?
The price and inventory of STK22C48-SF45 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK22C48-SF45 is usually 5 days.
3.What payment methods are accepted for STK22C48-SF45?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK22C48-SF45 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK22C48-SF45?
STK22C48-SF45 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK22C48-SF45 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-SF45?
For technical support, including STK22C48-SF45 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK22C48-SF45 requirements.
6.How does Aetrix verify that STK22C48-SF45 is sourced from the original manufacturer or authorized distributors?
All STK22C48-SF45 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-SF45 meets industry standards.
7.What is the process for return or replacement of STK22C48-SF45?
All STK22C48-SF45 units undergo pre-shipment inspection (PSI). If there is an issue with STK22C48-SF45, 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-SF45 part is unused and in its original packaging.
Return procedure for STK22C48-SF45:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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