My Inquiry
My Account
Renesas QS34X383Q3G
- Part No.:
- QS34X383Q3G
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 80-FSOP (0.154", 3.90mm Width)
- Datasheet:
-
QS34X383Q3G.pdf
- Description:
- IC BUS FET EXCH SW 4X2:2 80QVSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,929
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
QS34X383Q3G from Renesas Electronics (formerly IDT) is a high-speed 32-bit bus exchange switch with four independent 8-bit bidirectional CMOS bus switches, 5Ω typical ON resistance, zero propagation delay, and TTL-compatible control inputs. It enables nibble-swap bus exchange between A/B and C/D buses for byte-swapping in industrial embedded systems.
For engineers reviewing the QS34X383Q3G datasheet, QS34X383Q3G pinout, QS34X383Q3G application, or QS34X383Q3G equivalent, key selection criteria include its 0.25 ns max propagation delay, 1.5–6.5 ns switch timing, -40°C to +85°C operation, 5V ±5% supply, and 80-pin MilliPaQ™ package compatibility with live-insertion requirements.
Technical Context
The QS34X383Q3G implements four independent 8-bit bidirectional analog bus switches controlled by four Bus Enable (BEx) and four Bus Exchange (BXx) signals. Each switch pair supports direct bus connect with no added propagation delay beyond RC load effects.
Its architecture enables dynamic nibble swapping: when BXx = H, A/B and C/D buses are cross-connected (A↔D, B↔C); when BXx = L, A↔C and B↔D. This allows real-time byte reordering without latching or clocking, supporting barrel shifter and 2-to-1 multiplexer configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ON Resistance | 6 Ω typical at VCC = 5V, 30 mA - ensures minimal voltage drop and signal integrity across connected buses |
| Propagation Delay | 0.25 ns max - contributes negligible timing overhead in high-speed data paths |
| Switch Turn-on Delay | 1.5–6.5 ns - defines minimum enable-to-valid-data latency for synchronous bus handshaking |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade embedded control and communications equipment |
| Supply Voltage | 5.0 V ±5% - compatible with standard TTL/CMOS logic rails and legacy 5V system designs |
| Input Compatibility | TTL-level control inputs (VIH ≥ 2 V, VIL ≤ 0.8 V) - interoperable with 74-series and microcontroller GPIOs |
| Charge Injection | 1.5 pC max - limits transient glitches during switching in sensitive analog or mixed-signal interfaces |
Pinout & Package
QS34X383Q3G is housed in an 80-pin MilliPaQ™ package (150 mil body), surface-mount, lead-free, RoHS-compliant. Pin layout supports dual-row gull-wing leads with dedicated VCC and GND pins distributed across the perimeter for low-noise power delivery.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15, B0–B15, C0–C15, D0–D15 | Bi-directional bus I/O | Four 16-bit data buses (A/B/C/D); each group supports 8-bit parallel switching per BE/BX control set |
| BE1–BE4 | Digital input | Enable/disable corresponding 8-bit switch bank; active-low logic disconnects all channels to Hi-Z |
| BX1–BX4 | Digital input | Selects nibble-swap mode (H) or direct connect mode (L) for associated A/B/C/D bus pairs |
| VCC (pins 41, 79, 80) | Power supply | 5V core supply; three dedicated pins reduce IR drop and improve noise immunity |
| GND (pins 10, 20, 30, 40) | Ground reference | Four distributed ground pins minimize ground bounce during simultaneous switching |
Key Features
| Feature | Design Value |
|---|---|
| Nibble-swap bus exchange | Enables real-time byte reordering between A/B and C/D buses without clocks or latches |
| Zero-propagation-delay switching | Eliminates timing skew in critical data paths-only RC load delay remains |
| Live insertion support | Hi-Z state on disable and robust ESD tolerance allow hot-plug operation in backplane systems |
| Low 5Ω ON resistance | Maintains signal fidelity for 5V TTL/CMOS logic levels up to 120 mA per channel |
| TTL-compatible control interface | Direct drive from legacy microcontrollers and logic families without level-shifting |
Applications
| Industrial Backplane Interconnect | Legacy System Bus Extension |
|---|---|
Use Scenario: Hot-swappable module insertion into a 32-bit VMEbus or CompactPCI chassis requiring dynamic bus routing. IC Role / Device Role / Timing Role: Bidirectional bus exchange switch enabling on-the-fly A/B ↔ C/D bus remapping during module insertion. Use Value: Eliminates need for complex FPGA-based bus arbiters; reduces insertion latency to sub-ns levels via zero-delay switching. | Use Scenario: Extending a 16-bit ISA or PCI bus to 32-bit width while maintaining backward compatibility with older peripherals. IC Role / Device Role / Timing Role: High-speed bus multiplexer that selects between two 16-bit data sources using BX/BE controls. Use Value: Enables seamless integration of new 32-bit controllers with legacy 16-bit slave devices without redesigning timing-critical glue logic. |
| Real-Time Data Path Reconfiguration | Low-Delay Barrel Shifter |
Use Scenario: Configurable data path in test equipment where input data streams must be dynamically reordered before ADC sampling. IC Role / Device Role / Timing Role: Programmable bus exchange element controlled by FPGA GPIOs to route nibbles across four parallel buses. Use Value: Achieves <1 ns reconfiguration latency-critical for deterministic jitter-sensitive measurement systems. | Use Scenario: Hardware-accelerated bit rotation in cryptographic co-processors requiring sub-cycle shift operations. IC Role / Device Role / Timing Role: Cascaded QS34X383Q3G units implementing 4-bit rotate-left/right functions per stage. Use Value: Delivers 0.25 ns per stage propagation-enabling full 32-bit rotation in under 2 ns, outperforming register-based shifts. |
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 capability; 7Ω RON | Limited to static 8-bit bus gating; cannot perform byte-swapping or multiplexing | Choose only if nibble exchange is unnecessary and lower channel count suffices |
| PI3CH480E | 16-bit configurable bus switch with 3-state outputs; supports 3.3V/5V I/O; no built-in exchange logic | Requires external logic to emulate BX functionality; higher pin count and board area | Prefer when mixed-voltage interfacing is required and FPGA-controlled exchange is acceptable |
Compared with SN74CBT3244DBR and PI3CH480E, the QS34X383Q3G uniquely integrates nibble-swap logic and 32-bit width in a single 80-pin package-reducing component count, PCB area, and timing uncertainty in byte-reordering applications.
Availability
QS34X383Q3G is available at Aetrix Electronics and suitable for industrial backplane interconnect, legacy bus extension, and real-time data path reconfiguration requiring stable component supply over extended product lifecycles.
Supply support for QS34X383Q3G 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, infrastructure, and IoT applications.
The QS34X383Q3G belongs to Renesas' legacy QuickSwitch® bus switch family, designed specifically for zero-delay, high-fidelity signal routing in industrial and telecom backplane systems requiring live insertion and deterministic timing.
FAQ
What is the maximum operating frequency supported by the QS34X383Q3G?
The QS34X383Q3G does not specify a maximum clock frequency because it is an analog bus switch-not a clocked device. Its performance is governed by RC time constants: with 5Ω RON and 50pF load, the intrinsic time constant is ~0.25 ns. System-level bandwidth depends on driver strength and trace capacitance, but the QS34X383Q3G itself imposes no fundamental frequency limit. For reliable operation, ensure edge rates remain within the 1.5–6.5 ns switch timing window.
Does the QS34X383Q3G support 3.3V logic control inputs?
No-the QS34X383Q3G requires 5V ±5% supply and TTL-compatible control inputs (VIH ≥ 2.0 V, VIL ≤ 0.8 V). While 3.3V logic may meet VIH threshold marginally, it violates the specified 5V operation and risks unreliable BX/BE assertion under temperature/voltage variation. Use level translators or 5V-tolerant GPIOs to drive QS34X383Q3G controls in mixed-voltage systems.
How does the nibble-swap function work in the QS34X383Q3G?
The QS34X383Q3G implements nibble-swap per 8-bit bank via the BXx inputs. When BXx = L, A0–A7 connects to C0–C7 and B0–B7 connects to D0–D7. When BXx = H, A0–A7 connects to D0–D7 and B0–B7 connects to C0–C7. This cross-connect behavior enables byte-level bus reordering without clocks or storage elements-making QS34X383Q3G ideal for real-time data path manipulation.
Can the QS34X383Q3G be used as a 16-bit 2-to-1 multiplexer?
Yes-the QS34X383Q3G can configure one 16-bit bank (e.g., A/B and C/D) as a 2-to-1 mux by tying BE1 and BE2 to opposite states and controlling BX1 to select source. With BE1 = L and BE2 = H, A/B drives output when BX1 = L (A→C, B→D), or D/C when BX1 = H (A→D, B→C). This provides true 16-bit multiplexing with sub-nanosecond switching-no additional logic required.
Is the QS34X383Q3G pin-compatible with earlier IDT QS34X383 variants?
Yes-the QS34X383Q3G retains identical pinout, electrical characteristics, and functional behavior as the original IDT QS34X383 in MilliPaQ™ packaging. The "Q3G" suffix denotes RoHS-compliant, green-processed 80-pin MilliPaQ™-fully interchangeable in layout and firmware. No PCB or schematic changes are needed when migrating from legacy IDT-labeled units to current Renesas-branded QS34X383Q3G.
QS34X383Q3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 34X
- Package/Case:
- 80-FSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
QS34X383Q3G FAQ
1.How can I place an order for QS34X383Q3G through Aetrix?
Please submit a Request for Quotation (RFQ) for QS34X383Q3G 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 QS34X383Q3G reliable?
The price and inventory of QS34X383Q3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS34X383Q3G is usually 5 days.
3.What payment methods are accepted for QS34X383Q3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS34X383Q3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QS34X383Q3G?
QS34X383Q3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS34X383Q3G 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 QS34X383Q3G?
For technical support, including QS34X383Q3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS34X383Q3G requirements.
6.How does Aetrix verify that QS34X383Q3G is sourced from the original manufacturer or authorized distributors?
All QS34X383Q3G 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 QS34X383Q3G meets industry standards.
7.What is the process for return or replacement of QS34X383Q3G?
All QS34X383Q3G units undergo pre-shipment inspection (PSI). If there is an issue with QS34X383Q3G, 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 QS34X383Q3G part is unused and in its original packaging.
Return procedure for QS34X383Q3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
QS34X383Q3G Tags
-
SN74HC138DR
Texas Instruments
-
TC7SB3157CFU,LF(CT
Toshiba Semiconductor and Storage
-
74CBTLV3257PW,118
Nexperia USA Inc.
-
SN74CBTLV3257PWR
Texas Instruments
-
74CBTLV3257GUX
Nexperia USA Inc.
-
74HC154BQ,118
Nexperia USA Inc.
-
P3S0200GMX
NXP USA Inc.
-
SN74CB3Q3245PWR
Texas Instruments
-
SN74CB3Q3257RGYR
Texas Instruments
-
TCA9543APWR
Texas Instruments
-
TCA9546APWR
Texas Instruments
-
SN74HC138N
Texas Instruments
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
