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STMicroelectronics RHFLVDS2281K1
- Part No.:
- RHFLVDS2281K1
- Manufacturer:
- STMicroelectronics
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 64-CFlatpack
- Datasheet:
-
RHFLVDS2281K1.pdf
- Description:
- DUAL 4X4 LVDS CROSSPOINT SWITCH
- Quantity:
- Payment:
- Shipping:
Inventory:2,734
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Product details
Overview
RHFLVDS2281K1 from STMicroelectronics is a rad-hard, dual 4×4 LVDS crosspoint switch IC designed for high-integrity aerospace data routing. It provides two independent 4-input × 4-output LVDS multiplexers with fail-safe and cold-spare functionality, supports 400 Mbps (200 MHz) differential signaling, operates from -55 °C to +125 °C, and delivers guaranteed radiation tolerance up to 300 krad TID - deployed in satellite telemetry and onboard avionics interconnects.
For engineers reviewing the RHFLVDS2281K1 datasheet, RHFLVDS2281K1 pinout, RHFLVDS2281K1 application, or RHFLVDS2281K1 equivalent, this page details its radiation-hardened LVDS switching architecture, cold-spare I/O behavior, fail-safe output state logic, hermetic Ceramic Flat-64 package constraints, and configuration modes including repeater, splitter, and switch operation per MUX block.
Technical Context
The RHFLVDS2281K1 integrates two independent 4×4 LVDS crosspoint switches, each configurable via four SL control inputs per MUX to select input-to-output mapping across eight channels (IN1–IN8 → OUT1–OUT8). Its internal fail-safe circuitry forces outputs high during floating or shorted LVDS inputs, while cold-spare buffers isolate all pins at VCC = GND without bus contention.
It features dual clock paths (CLKIN+/CLKIN− and CLKOUT+/CLKOUT−) supporting 200 MHz clock distribution, operates at 3.3 V ±10% supply with 220 mW typical power draw, and guarantees full functionality across -4 V to +5 V input common-mode range - enabling robust interfacing with legacy and mixed-voltage LVDS systems in radiation-exposed environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0–3.6 V - ensures compatibility with standard LVDS power domains and enables low-noise operation under spacecraft bus regulation. |
| Data Rate | 400 Mbps (200 MHz) - supports high-throughput sensor telemetry and real-time video streaming over controlled 100 Ω transmission lines. |
| TID Radiation Tolerance | 300 krad - qualified per MIL-STD-883 TM 1019 for long-duration LEO/GEO missions without functional degradation. |
| SEL Immunity | Up to 135 MeV·cm²/mg - prevents single-event latchup in high-energy proton and heavy-ion environments (e.g., Van Allen belts). |
| Operating Temperature | -55 °C to +125 °C - validated for use in unheated payload bays and engine-adjacent avionics enclosures. |
| Input Common-Mode Range | -4 V to +5 V - accommodates ground potential shifts and noise transients in large-spacecraft harnesses without signal loss. |
| Fail-Safe Output State | Stable high-level output on floating/shorted inputs - eliminates undefined logic states in open-wire fault conditions. |
Pinout & Package
Housed in a hermetic Ceramic Flat-64 package (SMD 5962F14234), the RHFLVDS2281K1 features grounded metallic lid, 64 leads arranged in 8×8 grid, and mass of 1.94 g - optimized for thermal dissipation and mechanical stability in launch vibration and vacuum environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1+ to IN8+ | Differential LVDS input positive | Accepts high-speed data or clock signals with VID ≥ 100 mV; referenced to matching INx− for noise rejection. |
| IN1− to IN8− | Differential LVDS input negative | Completes differential pair; enables common-mode rejection up to 300 mVp-p at 10 MHz. |
| OUT1+ to OUT8+ | Differential LVDS output positive | Drives 100 Ω terminated lines with 250–400 mV differential swing and <0.6 ns channel skew. |
| OUT1− to OUT8− | Differential LVDS output negative | Provides complementary signal; maintains tight VOS (1.125–1.45 V) for stable logic thresholds. |
| SL1–SL4 / SL5–SL8 | MUX selection control (TTL) | Configures routing mode (splitter/repeater/switch); floating SL = logic low per datasheet Note 1. |
| EN1–EN8 / ENCK | Channel enable (TTL) | Individually disables drivers/receivers; EN = low places outputs in high-Z with <10 µA leakage at VCC = 0 V. |
| CLKIN+/CLKIN− | Differential clock input | Accepts 200 MHz clock for synchronization; supports jitter-critical timing distribution in phased-array systems. |
| CLKOUT+/CLKOUT− | Differential clock output | Re-drives input clock with <0.7 ns chip-to-chip skew - enables deterministic clock tree expansion. |
| VCC / GND | Power and ground | All VCC pins must be tied to same 3.3 V rail; GND pins provide low-inductance return paths for each quadrant. |
Key Features
| Feature | Design Value |
|---|---|
| Cold-spare I/O buffers | Enables zero-power redundancy: all pins enter high-Z when VCC = GND, eliminating bus contention in hot-swap or failover architectures. |
| Fail-safe output logic | Guarantees high-level LVDS output on floating or shorted inputs - removes need for external pull-ups and prevents metastability in open-cable faults. |
| Configurable MUX modes | Eight distinct routing configurations per 4×4 block (e.g., repeater, splitter, switch) controlled by TTL SL inputs - reduces FPGA I/O count in reconfigurable payloads. |
| Radiation-hardened design | QML-V qualified per MIL-PRF-38535; tested to 300 krad TID, 135 MeV·cm²/mg SEL, and 22 MeV·cm²/mg SET/SEU - certified for flight-critical subsystems. |
| Hermetic Ceramic Flat-64 | Sealed ceramic package with grounded lid meets MIL-STD-883 requirements for moisture resistance and thermal cycling reliability in space vacuum. |
Applications
| Onboard Telemetry Router | Satellite Payload Switch Matrix |
|---|---|
|
Use Scenario: Routing multiple sensor streams (star tracker, gyros, thermal monitors) to redundant downlink transceivers in LEO satellites. IC Role / Device Role / Timing Role: Dual 4×4 LVDS crosspoint switch managing time-synchronized data paths with sub-nanosecond skew control. Use Value: Enables dynamic reconfiguration of telemetry paths during anomaly recovery without power cycle or FPGA reload. |
Use Scenario: Interconnecting imaging sensors, ADCs, and FPGAs in Earth observation payloads requiring radiation-tolerant signal integrity. IC Role / Device Role / Timing Role: High-speed LVDS repeater and splitter distributing clock and pixel data across heterogeneous processing chains. Use Value: Maintains 400 Mbps throughput and <0.6 ns intra-channel skew despite 15-year mission lifetime in trapped radiation zones. |
| Avionics Data Concentrator | Radiation-Tolerant Test Interface |
|
Use Scenario: Aggregating ARINC 429, MIL-STD-1553, and discrete I/O signals into consolidated LVDS backplane links for flight computers. IC Role / Device Role / Timing Role: LVDS level-shifter and multiplexer bridging legacy buses to modern high-speed interconnects with fail-safe fault containment. Use Value: Eliminates single-point failure risk via cold-spare redundancy and ensures defined output state during bus disconnection events. |
Use Scenario: Emulating flight hardware I/O in ground test rigs exposed to proton beam irradiation for qualification validation. IC Role / Device Role / Timing Role: Radiation-hardened LVDS switch enabling real-time re-routing of stimulus/response signals during heavy-ion testing. Use Value: Provides traceable, post-irradiation functional verification without replacement - reducing test cost and schedule risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LVDS crosspoint switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN65LVDS22 | Commercial-grade, non-rad-hard, 200 Mbps max, no cold-spare or fail-safe, SOIC-48 package | Limited to ground-based or short-duration suborbital systems; lacks TID/SEL immunity and wide-temp support | Select only for cost-sensitive prototyping where radiation and extended temperature are not required. |
| RHFLVDS2282K1 | Same die, but configured as single 8×8 crosspoint (not dual 4×4); identical radiation specs and package | Used when centralized routing is preferred over parallel MUX blocks; requires different control logic mapping | Choose when system architecture demands unified 8-input/8-output path selection instead of independent dual-domain switching. |
Compared with SN65LVDS22 and RHFLVDS2282K1, the RHFLVDS2281K1 uniquely balances dual-domain flexibility, flight-certified radiation hardness, and fail-safe reliability - making it the only option for dual-redundant, long-life spaceborne LVDS interconnects requiring guaranteed operation after 300 krad exposure.
Availability
RHFLVDS2281K1 is available at Aetrix Electronics and suitable for satellite telemetry systems, avionics data concentrators, radiation-test interface rigs, and onboard payload switch matrices requiring stable component supply across extended product lifecycles.
Supply support for RHFLVDS2281K1 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, specializing in automotive, industrial, and aerospace-grade ICs with deep expertise in radiation-hardened process technologies.
The RHFLVDS2281K1 belongs to ST's QML-V rad-hard analog interface product line, engineered specifically for high-reliability data routing in spacecraft, launch vehicles, and nuclear instrumentation where signal integrity must survive extreme radiation and thermal stress.
FAQ
What is the maximum allowable input common-mode voltage for RHFLVDS2281K1?
The RHFLVDS2281K1 supports an input common-mode voltage range of -4 V to +5 V, verified across -55 °C to +125 °C and post-300 krad irradiation. This wide range accommodates ground potential differences in large spacecraft structures and ensures reliable operation with mismatched termination or cable-induced offsets.
How does the fail-safe function behave during a floating LVDS input condition?
When any LVDS input pair (e.g., IN1+/IN1−) floats or shorts, internal comparators force the corresponding outputs (e.g., OUT1+/OUT1−) into a stable high-logic state - confirmed by electrical testing per Table 2 of DS10914 Rev 3. No external components are needed to guarantee defined output behavior.
Can RHFLVDS2281K1 operate with a 2.5 V supply?
No - the RHFLVDS2281K1 is specified only for 3.0–3.6 V operation per Table 4 of the datasheet. Operation below 3.0 V violates absolute minimum supply rating and risks failure to meet propagation delay, skew, and fail-safe timing specifications across temperature and radiation conditions.
What is the thermal resistance junction-to-case (RthJC) for the Ceramic Flat-64 package?
The RHFLVDS2281K1 has a junction-to-case thermal resistance of 20 °C/W, measured per MIL-STD-883 TM 1012. This value enables accurate junction temperature estimation under 220 mW typical power dissipation, supporting thermal margin analysis for conduction-cooled avionics enclosures.
RHFLVDS2281K1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 64-CFlatpack
- Packaging:
- Strip
- Product Status:
- Active
- Type:
- Crosspoint Switch
- Circuit:
- 1 x 4:4
- Independent Circuits:
- 2
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-CFlatpack
RHFLVDS2281K1 FAQ
1.How can I place an order for RHFLVDS2281K1 through Aetrix?
Please submit a Request for Quotation (RFQ) for RHFLVDS2281K1 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 RHFLVDS2281K1 reliable?
The price and inventory of RHFLVDS2281K1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RHFLVDS2281K1 is usually 5 days.
3.What payment methods are accepted for RHFLVDS2281K1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RHFLVDS2281K1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RHFLVDS2281K1?
RHFLVDS2281K1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RHFLVDS2281K1 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 RHFLVDS2281K1?
For technical support, including RHFLVDS2281K1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RHFLVDS2281K1 requirements.
6.How does Aetrix verify that RHFLVDS2281K1 is sourced from the original manufacturer or authorized distributors?
All RHFLVDS2281K1 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 RHFLVDS2281K1 meets industry standards.
7.What is the process for return or replacement of RHFLVDS2281K1?
All RHFLVDS2281K1 units undergo pre-shipment inspection (PSI). If there is an issue with RHFLVDS2281K1, 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 RHFLVDS2281K1 part is unused and in its original packaging.
Return procedure for RHFLVDS2281K1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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