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Renesas QS3244SOG
- Part No.:
- QS3244SOG
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
QS3244SOG.pdf
- Description:
- IC BUS SWITCH 4 X 1:1 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,704
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Product details
Overview
QS3244SOG from Renesas Electronics is an 8-bit high-speed CMOS bus switch with TTL-compatible pinout, 5Ω ON-resistance, zero propagation delay, and industrial temperature range (–40°C to +85°C). It enables bidirectional signal routing for hot-swapping, voltage translation (5V ↔ 3.3V), and clock gating in embedded control buses.
For engineers reviewing the QS3244SOG datasheet, QS3244SOG pinout, QS3244SOG application, or QS3244SOG equivalent, key selection criteria include guaranteed 5Ω RON at VCC = 5V, undershoot clamp diodes on all I/Os, Hi-Z off-state isolation, and compatibility with 74FCT244/74F244 logic families.
Technical Context
The QS3244SOG implements eight independent N-channel FET switches with no inherent body diode to VCC, enabling true bidirectional operation without forward-bias risk. Each channel features integrated undershoot clamp diodes on both A and Y terminals and separate enable controls (1G, 2G) that mirror 74'244 logic behavior.
It operates exclusively at VCC = 5V ±5% with DC input voltage tolerance of –0.5V to +7V across all pins except VCC, and supports AC pulse inputs down to –3V (≤20ns). Off-state leakage is ±1μA, and dynamic supply current is 0.25mA/MHz under toggling control inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RON (ON Resistance) | 5Ω typical at VCC = 5V, VIN = 0V, ION = 30mA - ensures minimal RC delay and near-zero added propagation in 50pF load systems |
| tPLH / tPHL | 0.25ns max - no measurable logic delay; system timing governed solely by driver and load, not switch |
| VIN Range | –0.5V to +7V (all I/Os) - supports hot-swap transients and mixed-voltage domain interfacing |
| IOZ (Off-State Current) | ±1μA max - provides high-impedance isolation critical for bus contention prevention |
| Operating Temp | –40°C to +85°C - qualified for industrial control, factory automation, and telecom infrastructure |
| ICCQ | 3μA max - ultra-low quiescent current enables always-on isolation without power penalty |
Pinout & Package
QS3244SOG is supplied in a 20-pin QSOP (Quarter Size Outline Package) with 0.65mm pitch, JEDEC MO-137AC compliant, RoHS-compliant green molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1G, 2G | Active-Low Output Enable | Controls group A (pins 2–9) and group B (pins 12–19); LOW enables bidirectional pass-through |
| 1A1–1A4, 1Y1–1Y4 | Group 1 Data I/O Pairs | Bidirectional channels: 1A1↔1Y1, etc.; no direction pin required due to symmetric FET structure |
| 2A1–2A4, 2Y1–2Y4 | Group 2 Data I/O Pairs | Independent second set of four bidirectional channels, isolated from Group 1 when respective G is HIGH |
| VCC (Pin 11) | Power Supply | 5V ±5% only; powers internal clamp diodes and gate drive - not tolerant of 3.3V operation |
| GND (Pin 10) | Ground Reference | Common return for all I/Os and control signals; must be low-inductance connection to minimize ground bounce |
Key Features
| Feature | Design Value |
|---|---|
| Zero-propagation-delay switching | RC time constant <0.25ns at 50pF load - eliminates need for timing budget allocation in high-speed backplanes |
| Undershoot clamp diodes | Integrated on all A/Y and G pins - protects against –3V transients during hot-plug events without external components |
| 5Ω low-ON-resistance | Guaranteed ≤7Ω over full temp/voltage range - maintains signal integrity up to 200MHz with <0.5dB loss |
| Pin compatibility | Direct drop-in replacement for 74FCT244, 74F244, and 74ALS/AS/LS244 - no PCB redesign required |
| Industrial temperature rating | –40°C to +85°C operation with full parameter guarantee - suitable for uncooled DIN-rail mounted controllers |
Applications
| Hot-Swappable Backplane Interface | Voltage-Level Translation |
|---|---|
Use Scenario: Inserting/removing line cards in telecom shelf systems while main bus remains active. IC Role / Device Role / Timing Role: Bidirectional isolation switch enabling live insertion without bus contention or glitch propagation. Use Value: Prevents data corruption during card swap using Hi-Z isolation and undershoot clamping on all I/Os. | Use Scenario: Interfacing 5V microcontroller peripherals with 3.3V FPGA I/O banks. IC Role / Device Role / Timing Role: Passive level shifter with no direction control or power-domain crossing logic. Use Value: Enables safe 5V↔3.3V translation without level-shifter ICs or resistive dividers - preserves edge rate and timing margin. |
| Low-Power Clock Gating | Capacitance-Reduced Bus Isolation |
Use Scenario: Dynamically disabling clock distribution to idle subsystems in battery-powered industrial gateways. IC Role / Device Role / Timing Role: Low-RON switch inserted in clock path to gate signal flow with sub-nanosecond turn-off. Use Value: Reduces dynamic power by cutting clock tree loading; 5Ω RON avoids duty-cycle distortion or jitter accumulation. | Use Scenario: Isolating test instrumentation from DUT during calibration to avoid parasitic loading effects. IC Role / Device Role / Timing Role: High-isolation switch with 7pF OFF-state capacitance per channel - minimizes crosstalk and signal degradation. Use Value: Maintains signal fidelity in high-frequency analog/digital mixed-signal test setups by reducing effective bus capacitance by >80%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74FCT244CTSO | Higher RON (~15Ω), slower turn-off (15ns), no undershoot clamps | Lacks hot-swap robustness; requires external protection diodes | Lower cost where transient immunity and speed are non-critical |
| SN74CBT3244CPWR | Same 5Ω RON, but rated only to +70°C; no industrial temp guarantee | Suitable for commercial-grade systems only; not qualified for extended ambient operation | Valid alternative if operating environment stays below 70°C and RoHS compliance is confirmed |
Compared with 74FCT244CTSO and SN74CBT3244CPWR, the QS3244SOG uniquely combines industrial temperature rating, integrated undershoot protection, and sub-0.25ns delay - making it the only choice for ruggedized hot-swap and mixed-voltage infrastructure designs.
Availability
QS3244SOG is available at Aetrix Electronics and suitable for hot-swappable backplanes, voltage-level translation interfaces, and low-power clock-gating circuits requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for QS3244SOG 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 IoT applications.
The QS3244SOG belongs to Renesas' QuickSwitch® bus switch product line, engineered specifically for zero-delay signal routing, hot-plug resilience, and mixed-voltage domain bridging in mission-critical industrial systems.
FAQ
What is the maximum allowable input voltage on A/Y pins of the QS3244SOG?
The QS3244SOG allows –0.5V to +7V on all A and Y pins, independent of VCC. This wide range accommodates hot-swap transients and mixed-voltage signaling. The device includes integrated undershoot clamp diodes to safely absorb –3V pulses (≤20ns), making the QS3244SOG robust against insertion-induced voltage excursions without external protection components.
Does the QS3244SOG support 3.3V-only operation?
No, the QS3244SOG requires VCC = 5V ±5% and is not specified for 3.3V operation. Its internal circuitry, including clamp diodes and gate drive, is optimized for 5V supply. While I/Os tolerate 3.3V signals (within the –0.5V to +7V range), applying 3.3V to VCC (Pin 11) violates Absolute Maximum Ratings and may cause functional failure. The QS3244SOG must be powered from a stable 5V rail.
How does the QS3244SOG achieve zero propagation delay?
The QS3244SOG achieves effectively zero propagation delay because its 5Ω ON-resistance forms an RC network with load capacitance - yielding a time constant <0.25ns at 50pF. Since this is orders of magnitude smaller than typical driver rise/fall times, the QS3244SOG adds no measurable delay. System timing remains governed entirely by the driving source and load, not the QS3244SOG itself.
Is the QS3244SOG pin-compatible with standard 74-series logic devices?
Yes, the QS3244SOG is pin-compatible with 74FCT244, 74F244, and 74ALS/AS/LS244 octal buffer/drivers. Its 20-pin QSOP layout matches the industry-standard footprint, allowing direct replacement without PCB modification. However, unlike those logic buffers, the QS3244SOG provides bidirectional, zero-delay switching rather than unidirectional amplification with propagation delay.
What is the off-state capacitance of the QS3244SOG and why does it matter?
The QS3244SOG exhibits 5–7pF off-state capacitance per channel, measured at 1MHz with 0V bias. This low value minimizes capacitive loading when switches are disabled, preserving signal integrity and reducing crosstalk in high-density bus architectures. In applications like test equipment isolation or clock tree partitioning, this spec directly enables higher bandwidth and lower jitter compared to alternatives with >15pF off-capacitance.
QS3244SOG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Bus Switch
- Circuit:
- 4 x 1:1
- Independent Circuits:
- 2
- 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:
- 20-SOIC
QS3244SOG FAQ
1.How can I place an order for QS3244SOG through Aetrix?
Please submit a Request for Quotation (RFQ) for QS3244SOG 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 QS3244SOG reliable?
The price and inventory of QS3244SOG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS3244SOG is usually 5 days.
3.What payment methods are accepted for QS3244SOG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS3244SOG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QS3244SOG?
QS3244SOG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS3244SOG 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 QS3244SOG?
For technical support, including QS3244SOG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS3244SOG requirements.
6.How does Aetrix verify that QS3244SOG is sourced from the original manufacturer or authorized distributors?
All QS3244SOG 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 QS3244SOG meets industry standards.
7.What is the process for return or replacement of QS3244SOG?
All QS3244SOG units undergo pre-shipment inspection (PSI). If there is an issue with QS3244SOG, 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 QS3244SOG part is unused and in its original packaging.
Return procedure for QS3244SOG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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