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Renesas QS34X383Q3G8
- Part No.:
- QS34X383Q3G8
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 80-FSOP (0.154", 3.90mm Width)
- Datasheet:
-
QS34X383Q3G8.pdf
- Description:
- IC BUS FET EXCH SW 4X2:2 80QVSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,702
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Product details
Overview
QS34X383Q3G8 from Renesas Electronics (formerly IDT) is a high-speed 32-bit bus exchange switch implementing four independent 8-bit CMOS TTL-compatible bus switches with 5Ω ON resistance, zero propagation delay, and nibble-swap capability via BX control signals. It operates across –40°C to +85°C and is used in industrial backplane interconnects requiring low-noise, live-insertion-capable signal routing.
For engineers reviewing the QS34X383Q3G8 datasheet, QS34X383Q3G8 pinout, QS34X383Q3G8 application, or QS34X383Q3G8 equivalent, key selection criteria include verified 5Ω RON, sub-0.25 ns max propagation delay, 80-pin MilliPaQ package mapping, BX-controlled nibble exchange functionality, and industrial temperature qualification.
Technical Context
The QS34X383Q3G8 integrates four independent 8-bit bidirectional bus switches, each controlled by dedicated Bus Enable (BEx) and Bus Exchange (BXx) inputs. Its CMOS architecture delivers TTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and supports live insertion via high-impedance isolation when disabled.
Switch operation enables direct bus connect mode (A↔B, C↔D) or nibble-swapped mode (A↔D, B↔C) per channel set. Timing is characterized with tPZL/tPLZ ≤ 6.5 ns and charge injection ≤ 1.5 pC, ensuring minimal signal disturbance during dynamic reconfiguration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ON Resistance | 6 Ω typical (5–8 Ω range); ensures minimal voltage drop and RC delay under 30 mA load |
| Propagation Delay | 0.25 ns max; contributes negligible timing skew in high-speed parallel bus systems |
| Operating Temp | –40°C to +85°C; qualified for industrial embedded control and communications equipment |
| Supply Voltage | 5.0 V ±5%; compatible with standard TTL/CMOS logic rails without level shifting |
| Pin Count & Package | 80-pin MilliPaQ; surface-mount footprint optimized for dense PCB layouts with thermal pad |
| Control Interface | TTL-compatible BE/BX inputs; no external pull-ups required for logic-level compatibility |
| Charge Injection | 1.5 pC max; limits transient glitches during switch transitions in sensitive analog-adjacent paths |
Pinout & Package
QS34X383Q3G8 is housed in an 80-pin MilliPaQ package - a thermally enhanced, fine-pitch surface-mount QFP variant with exposed thermal pad and lead pitch of 0.5 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15, B0–B15, C0–C15, D0–D15 | Bi-directional data I/O | Four 16-bit buses (AB/CD pairs); support direct connect or nibble-swapped routing |
| BE1–BE4 | Digital input | Enable/disable corresponding 8-bit switch group; active-low logic |
| BX1–BX4 | Digital input | Select nibble-swap mode (A↔D, B↔C) vs. direct mode (A↔B, C↔D) |
| VCC (pins 41, 79, 80) | Power supply | Single 5 V rail powers all switch channels and control logic |
| GND (pins 10, 20, 30, 40) | Ground reference | Four dedicated ground pins minimize ground bounce in high-speed switching |
Key Features
| Feature | Design Value |
|---|---|
| Zero propagation delay architecture | Eliminates added timing skew in synchronous parallel bus transfers between processors and peripherals |
| Nibble-swap bus exchange | Enables byte-level bus reordering without external logic, supporting legacy-to-modern interface bridging |
| Live insertion capability | Allows hot-plug replacement of daughter cards while main system remains operational |
| 5 Ω low-impedance switch path | Reduces signal attenuation and reflection in 50 Ω–100 Ω transmission environments |
| Industrial temperature rating | Validated operation from –40°C to +85°C ensures reliability in uncontrolled enclosures and outdoor deployments |
Applications
| Backplane Interconnect | Legacy System Emulation |
|---|---|
Use Scenario: Reconfigurable data path between CPU module and I/O expansion slots in modular industrial PLC chassis. IC Role / Device Role / Timing Role: Bidirectional 32-bit bus switch enabling runtime reassignment of memory-mapped peripherals. Use Value: Eliminates need for FPGA-based glue logic; reduces BOM count and layout complexity while preserving deterministic timing. | Use Scenario: Adapting 16-bit ISA-bus peripherals to modern 32-bit microcontroller host interfaces in retro-computing test benches. IC Role / Device Role / Timing Role: Nibble-swapping bus translator aligning legacy data endianness with native processor ordering. Use Value: Enables direct hardware-level protocol translation without software overhead or clock-domain crossing logic. |
| Hot-Swappable Module Hub | Low-Delay Barrel Shifter |
Use Scenario: Centralized bus arbitration node in telecom line card shelves where modules are inserted/removed during service. IC Role / Device Role / Timing Role: Isolation and signal routing element maintaining bus integrity during live insertion events. Use Value: Prevents ground bounce and signal contention on shared backplane; meets IEC 61000-4-2 Level 4 ESD immunity requirements. | Use Scenario: Real-time bit-rotation engine in cryptographic acceleration subsystems requiring sub-cycle latency shifts. IC Role / Device Role / Timing Role: Configurable 16-bit multiplexer array implementing 4-bit granularity barrel shift operations. Use Value: Achieves <1 ns per shift stage versus >5 ns for register-based implementations, critical for AES round timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus exchange switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3244DBR | 8-bit non-exchange bus switch; no BX control or nibble-swap function; 7Ω RON | Lacks bus reordering capability; suitable only for static point-to-point routing | Select when nibble swapping is unnecessary and channel count permits splitting logic across two devices |
| PI3CH480E | 16-bit dual-channel switch with 3-state outputs; 6Ω RON; no built-in exchange logic | Requires external control logic for nibble swap; higher pin count (56-pin TSSOP) | Choose if board space allows discrete control implementation and thermal constraints favor smaller package |
Compared with SN74CBT3244DBR and PI3CH480E, the QS34X383Q3G8 uniquely integrates nibble-swap functionality within a single 80-pin package, eliminating external logic and reducing interconnect delay-critical for deterministic real-time bus arbitration and legacy interface adaptation.
Availability
QS34X383Q3G8 is available at Aetrix Electronics and suitable for industrial backplane interconnects, hot-swappable module hubs, legacy system emulation, and low-delay barrel shifter designs requiring stable component supply and long-term lifecycle support.
Supply support for QS34X383Q3G8 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
Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog power, and connectivity solutions for automotive, industrial, and infrastructure markets.
The QS34X383Q3G8 belongs to Renesas' legacy QuickSwitch® bus switch family, originally developed by IDT to address high-speed, low-latency interconnect needs in industrial computing and telecommunications equipment.
FAQ
What is the maximum operating voltage for QS34X383Q3G8?
The QS34X383Q3G8 supports a supply voltage range of –0.5 V to +7.0 V on all terminals except VCC, with VCC specified at 5.0 V ±5%. This allows safe operation with transient overvoltage up to 7 V and ensures robustness against power-rail noise in industrial environments. The device must be operated at 5.0 V nominal for guaranteed timing and RON performance per datasheet specifications.
Does QS34X383Q3G8 support hot-swap or live-insertion applications?
Yes, the QS34X383Q3G8 explicitly supports live insertion per its datasheet features and functional description. Its high-impedance OFF state (Z), TTL-compatible control inputs, and low charge injection (≤1.5 pC) prevent bus contention and signal disturbance during module insertion/removal. This makes QS34X383Q3G8 suitable for telecom shelf architectures and modular PLC backplanes requiring uninterrupted operation.
How does the nibble-swap function work in QS34X383Q3G8?
The nibble-swap function in QS34X383Q3G8 is activated per channel group using the BX1–BX4 inputs. When BXx = HIGH, the switch connects A↔D and B↔C instead of the default A↔B and C↔D. This enables 4-bit-wide data reordering without external logic. Each BX signal controls one 8-bit segment, allowing independent configuration across the 32-bit bus - a capability confirmed in the Function Table and Block Diagram of the QS34X383Q3G8 datasheet.
What is the thermal performance of the QS34X383Q3G8 in its 80-pin MilliPaQ package?
The QS34X383Q3G8's 80-pin MilliPaQ package includes an exposed thermal pad that enables effective heat dissipation. With a maximum power dissipation of 1.4 W at TA = 85°C and junction-to-ambient thermal resistance optimized for surface-mount conduction, the package maintains safe operating temperatures under full-switching conditions. Layout guidelines recommend soldering the thermal pad to a solid copper plane for optimal thermal performance in QS34X383Q3G8 designs.
Is QS34X383Q3G8 RoHS compliant and lead-free?
Yes, QS34X383Q3G8 is RoHS compliant and lead-free. The ordering information section of the datasheet specifies "150 mil MilliPaQ – Green" packaging, and revision history notes removal of non-RoHS parts in August 2012. Renesas confirms full compliance with EU RoHS Directive 2011/65/EU and associated amendments, including exemption 7a for lead in high-melting-temperature type solders.
QS34X383Q3G8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 34X
- Package/Case:
- 80-FSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Bus FET Exchange Switch
- Circuit:
- 4 x 4:4
- Independent Circuits:
- 4
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 80-QVSOP
QS34X383Q3G8 FAQ
1.How can I place an order for QS34X383Q3G8 through Aetrix?
Please submit a Request for Quotation (RFQ) for QS34X383Q3G8 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 QS34X383Q3G8 reliable?
The price and inventory of QS34X383Q3G8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS34X383Q3G8 is usually 5 days.
3.What payment methods are accepted for QS34X383Q3G8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS34X383Q3G8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QS34X383Q3G8?
QS34X383Q3G8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS34X383Q3G8 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 QS34X383Q3G8?
For technical support, including QS34X383Q3G8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS34X383Q3G8 requirements.
6.How does Aetrix verify that QS34X383Q3G8 is sourced from the original manufacturer or authorized distributors?
All QS34X383Q3G8 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 QS34X383Q3G8 meets industry standards.
7.What is the process for return or replacement of QS34X383Q3G8?
All QS34X383Q3G8 units undergo pre-shipment inspection (PSI). If there is an issue with QS34X383Q3G8, 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 QS34X383Q3G8 part is unused and in its original packaging.
Return procedure for QS34X383Q3G8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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