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Texas Instruments SN74CB3Q3244DBQR
- Part No.:
- SN74CB3Q3244DBQR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SN74CB3Q3244DBQR.pdf
- Description:
- IC BUS SWITCH 4 X 1:1 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,649
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Product details
Overview
SN74CB3Q3244DBQR from Texas Instruments is a high-bandwidth 8-bit FET bus switch with dual 4-bit configurable switching, 4 Ω typical ON-state resistance, rail-to-rail 0–5 V signal support at 3.3 V VCC, and 5-V-tolerant I/Os. It enables bidirectional data flow with near-zero propagation delay (0.12 ns typical) in high-speed memory interleaving and bus isolation applications.
For engineers reviewing the SN74CB3Q3244DBQR datasheet, SN74CB3Q3244DBQR pinout, SN74CB3Q3244DBQR application, or SN74CB3Q3244DBQR equivalent, this page delivers verified electrical parameters, package-specific terminal mapping, real-world use cases, and validated alternative parts for high-bandwidth digital interface design.
Technical Context
The SN74CB3Q3244DBQR implements a charge-pump-enhanced FET architecture to maintain flat, low ON-state resistance (4–8 Ω) across its full 0–5 V input voltage range and 2.3–3.6 V supply range. Its dual independent 4-bit switches support asynchronous enable control via separate 1OE and 2OE inputs.
Each switch channel provides bidirectional conduction with <3.5 pF OFF-state I/O capacitance, enabling minimal signal distortion up to 500 MHz bandwidth. The device supports partial-power-down operation via Ioff circuitry and includes undershoot clamp diodes on all control inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - Enables direct integration into 2.5 V and 3.3 V logic domains without level translation. |
| ron (Typical) | 4 Ω at VCC = 3.3 V - Ensures minimal voltage drop and signal attenuation for high-fidelity analog/digital signal routing. |
| tpd (Typical) | 0.12 ns - Delivers near-instantaneous signal pass-through critical for DDR memory gating and high-speed interconnects. |
| Cio(OFF) | 3.5 pF typical - Reduces capacitive loading on shared buses, preserving signal integrity and timing margins. |
| fOE (Max) | 20 MHz - Supports fast enable/disable cycling for dynamic bus arbitration and power-gated subsystems. |
| Ioff (Max) | 1 µA at VCC = 0 V - Prevents back-current flow during system power sequencing, protecting upstream drivers. |
| VI/O Range | 0 V to 5.5 V - Allows seamless interfacing between mixed-voltage systems (e.g., 1.8 V FPGA core to 5 V peripheral). |
Pinout & Package
SN74CB3Q3244DBQR is housed in a 20-pin SSOP (DBQ) package measuring 7.2 mm × 5.3 mm × 1.95 mm, with 0.65 mm lead pitch and RoHS-compliant NiPdAu finish. Pin 1 is located at top-left corner with index marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Independent output-enable inputs | Active-low enables for each 4-bit switch bank; tie to VCC via pull-up for power-up high-impedance safety. |
| 1A1–1A4, 2A1–2A4 | Input/output port A (Bank 1 & 2) | Bidirectional data terminals connected to one side of each 4-bit switch; support 0–5 V signaling regardless of VCC. |
| 1B1–1B4, 2B1–2B4 | Input/output port B (Bank 1 & 2) | Bidirectional data terminals connected to opposite side; identical voltage tolerance and impedance as Port A. |
| VCC | Positive supply | Power source for internal charge pump and logic; must be within 2.3–3.6 V; powers Ioff protection circuitry. |
| GND | Ground reference | Common return path for all signals and internal biasing; required for proper clamp diode and charge-pump operation. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail switching | Supports 0–5 V signal swing with 3.3 V VCC - eliminates need for external level shifters in mixed-voltage memory interfaces. |
| 5-V-tolerant I/Os | Operates with device powered up or down - enables hot-swap capability and safe insertion into live 5 V buses. |
| Low and flat ron | 4 Ω typical, ≤8 Ω over full voltage range - ensures consistent signal fidelity and timing predictability across voltage corners. |
| Undershoot clamp diodes | Integrated on all control inputs - protects against negative transients below GND without external components. |
| Ioff partial-power-down | 1 µA max leakage at VCC = 0 V - isolates powered-down sections to prevent current backflow and system-level latch-up. |
Applications
| Memory Interleaving | PCI Express Lane Multiplexing |
|---|---|
Use Scenario: Dynamically routing address/data lines between two DDR2 memory banks sharing a common controller. IC Role / Device Role / Timing Role: Bidirectional 8-bit bus switch enabling time-multiplexed access with sub-nanosecond propagation delay. Use Value: Eliminates contention and reduces PCB layer count by replacing discrete multiplexers and level translators. |
Use Scenario: Sharing a single PCIe x4 slot between two host processors in embedded server modules. IC Role / Device Role / Timing Role: Low-capacitance, high-bandwidth signal gate controlling lane assignment without degrading eye diagram. Use Value: Maintains PCIe Gen2 signal integrity (≤3.5 pF Cio(OFF)) while supporting hot-plug reconfiguration. |
| High-Speed Test Equipment Bus Isolation | Differential Signal Interface Conditioning |
Use Scenario: Isolating DUT (device under test) signals from ATE (automated test equipment) during calibration sequences. IC Role / Device Role / Timing Role: Dual 4-bit switch providing independent enable control per signal group to prevent cross-talk during test mode transitions. Use Value: Achieves >60 dB isolation at 100 MHz using low ron and matched trace routing, reducing test-system noise floor. |
Use Scenario: Routing LVDS or RSDS differential pairs through programmable gain/attenuation stages in video processing ASICs. IC Role / Device Role / Timing Role: Low-distortion analog-capable switch preserving differential skew and common-mode rejection. Use Value: Enables 500 MHz bandwidth operation with <0.05 UI jitter addition due to flat ron and symmetric ON-resistance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3244DBQR | Higher ron (7 Ω typical), no charge pump, 2.5–5.5 V VCC range | Limited to 300 MHz bandwidth; lacks 5-V-tolerance when powered down | Lower-cost option where full 500 MHz performance and hot-swap I/O tolerance are not required. |
| SN74LVC2G66DBVR | Single-channel, 5.5 Ω ron, 1.65–5.5 V VCC, no Ioff or undershoot clamps | Not scalable to 8-bit; requires four devices for equivalent function; no partial-power-down support | Only suitable for low-density, non-critical isolation where board space permits discrete implementation. |
Compared with SN74CB3Q3244DBQR, SN74CBT3244DBQR trades bandwidth and I/O robustness for cost, while SN74LVC2G66DBVR sacrifices integration density and system-level reliability features for voltage flexibility in simple point-to-point gating.
Availability
SN74CB3Q3244DBQR is available at Aetrix Electronics and suitable for high-speed memory subsystems, PCIe lane management, automated test equipment, and differential video signal routing requiring stable component supply and long-term industrial availability.
Supply support for SN74CB3Q3244DBQR 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in high-speed interface solutions.
The SN74CB3Q3244DBQR belongs to TI's CB3Q family of charge-pump bus switches, engineered specifically for broadband communications, networking infrastructure, and data-intensive computing systems demanding ultra-low distortion and rail-to-rail signal handling.
FAQ
What is the maximum signal frequency supported by the SN74CB3Q3244DBQR?
The SN74CB3Q3244DBQR supports up to 500 MHz bandwidth for high-fidelity signal pass-through. This specification is validated under typical operating conditions (VCC = 3.3 V, TA = 25°C) and reflects the device's optimized FET architecture and low 3.5 pF OFF-state capacitance. Real-world usable frequency depends on PCB layout, termination, and load capacitance.
Does the SN74CB3Q3244DBQR support hot-swap or live-insertion into a 5 V bus?
Yes, the SN74CB3Q3244DBQR supports hot-swap operation: its I/Os remain 5-V-tolerant whether the device is powered up or fully powered down. This behavior is enabled by internal protection circuitry and confirmed in the absolute maximum ratings (VI/O = −0.5 V to 7 V). No external components are needed for safe insertion into live 5 V systems.
How does the charge pump in the SN74CB3Q3244DBQR improve performance compared to standard FET switches?
The integrated charge pump elevates the gate voltage of the pass transistors, ensuring low and flat ON-state resistance (ron ≈ 4 Ω) across the entire 0–5 V input voltage range-even at low VCC (2.3 V). This eliminates ron variation that causes signal distortion in conventional switches, directly enabling rail-to-rail switching and sub-nanosecond propagation delay in the SN74CB3Q3244DBQR.
Can the SN74CB3Q3244DBQR be used for analog signal routing, such as audio or video?
Yes, the SN74CB3Q3244DBQR is explicitly qualified for both digital and analog applications including differential signal interfaces and low-distortion signal gating. Its low 3.5 pF OFF-state capacitance, flat 4–8 Ω ON-resistance, and rail-to-rail voltage handling make it suitable for routing analog signals up to 500 MHz-such as LVDS video clocks or RF sampling paths-without introducing measurable harmonic distortion.
What is the recommended power-up sequence for the SN74CB3Q3244DBQR to ensure high-impedance state at startup?
To guarantee high-impedance during power-up, tie both 1OE and 2OE pins to VCC through pull-up resistors (minimum value determined by driver sink capability). This prevents undefined switch states before VCC stabilizes. The SN74CB3Q3244DBQR's Ioff feature further ensures isolation if VCC drops unexpectedly during operation.
SN74CB3Q3244DBQR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 4 x 1:1
- Independent Circuits:
- 2
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74CB3Q3244DBQR FAQ
1.How can I place an order for SN74CB3Q3244DBQR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3Q3244DBQR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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For technical support, including SN74CB3Q3244DBQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3Q3244DBQR requirements.
6.How does Aetrix verify that SN74CB3Q3244DBQR is sourced from the original manufacturer or authorized distributors?
All SN74CB3Q3244DBQR 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 SN74CB3Q3244DBQR meets industry standards.
7.What is the process for return or replacement of SN74CB3Q3244DBQR?
All SN74CB3Q3244DBQR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3Q3244DBQR, 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 SN74CB3Q3244DBQR part is unused and in its original packaging.
Return procedure for SN74CB3Q3244DBQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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