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Texas Instruments SN74CBT3384CDBQR
- Part No.:
- SN74CBT3384CDBQR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SN74CBT3384CDBQR.pdf
- Description:
- IC BUS SWITCH 5 X 1:1 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,468
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Product details
Overview
SN74CBT3384CDBQR from Texas Instruments is a high-speed TTL-compatible 10-bit FET bus switch organized as two independent 5-bit bidirectional switches, featuring 3 Ω typical ON-state resistance, near-zero propagation delay (0.15 ns at 5 V), and undershoot protection to −2 V on A/B ports. It operates from 4 V to 5.5 V and supports mixed-voltage signaling (0.8 V to 5 V) in PCI interface and memory interleaving applications.
For engineers reviewing the SN74CBT3384CDBQR datasheet, SN74CBT3384CDBQR pinout, SN74CBT3384CDBQR application, or SN74CBT3384CDBQR equivalent, key selection criteria include Ioff-enabled partial-power-down operation, 5 pF typical OFF-state I/O capacitance, bidirectional signal gating with no level-shifting, and SSOP-24 (DBQ) package compatibility for space-constrained board layouts.
Technical Context
The SN74CBT3384CDBQR implements dual 5-bit FET-based analog/digital bus switches with separate active-low output-enable inputs (1OE, 2OE), enabling independent control of each 5-bit channel. Its architecture provides true bidirectional conduction with no internal direction logic or voltage translation.
Undershoot-protection circuitry actively monitors A/B port voltages and forces switch isolation when transient undershoot below −2 V occurs, while Ioff functionality prevents backflow current during partial power-down states-ensuring isolation even when VCC = 0 V and I/O pins are biased to 5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - Enables direct integration into 5-V TTL/CMOS systems without level shifters. |
| ron (Typical) | 3 Ω - Minimizes voltage drop and signal distortion under 64-mA load, critical for integrity in high-speed data paths. |
| tpd (Max) | 0.24 ns at 4 V - Near-zero propagation delay preserves timing margins in sub-nanosecond clock domains. |
| Cio(OFF) | 5 pF typical - Reduces capacitive loading on driven buses, limiting signal rise/fall time degradation. |
| Ioff | 10 µA at VCC = 0 - Guarantees isolation between powered and unpowered system domains during hot-swap or sleep modes. |
| VIKU | −2 V - Protects against negative transients on data lines without external clamping diodes. |
| ICC (Max) | 3 µA - Ultra-low quiescent current supports always-on monitoring circuits with minimal power budget impact. |
Pinout & Package
SN74CBT3384CDBQR is housed in a 24-pin SSOP (Shrink Small Outline Package) with DBQ footprint (6.2 mm × 7.9 mm, 1.2 mm max height), optimized for automated assembly and thermal performance (θJA = 61°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Controls ON/OFF state of respective 5-bit switch bank; must be pulled high via resistor during power sequencing to ensure Hi-Z at startup. |
| 1A1–1A5, 2A1–2A5 | Channel A data terminals | Input/output ports for first and second 5-bit switch banks; fully bidirectional with no direction pin required. |
| 1B1–1B5, 2B1–2B5 | Channel B data terminals | Paired with corresponding A pins; conductive path established only when OE is low and VCC is valid. |
| GND, VCC | Power supply connections | Single-supply operation; GND reference for all I/O and control signals; VCC powers internal protection circuitry and switch FETs. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional zero-delay switching | Enables transparent signal pass-through in either direction without added latency or direction control overhead. |
| −2 V undershoot protection | Prevents false turn-on and latch-up during negative transients common in hot-plug or cable-disconnect events. |
| Ioff partial-power-down support | Eliminates need for external isolation circuitry when subsystems enter low-power states while others remain active. |
| 5-V/3.3-V/1.8-V compatible I/O | Allows seamless interconnection between mixed-voltage ASICs, FPGAs, and legacy peripherals without level translators. |
| Low 5-pF OFF-state capacitance | Maintains signal integrity on high-impedance buses by minimizing capacitive coupling and crosstalk during isolation. |
Applications
| PCI Bus Isolation | Memory Interleaving |
|---|---|
Use Scenario: Isolating PCI add-in card data lines from motherboard during hot-swap or configuration changes. IC Role / Device Role / Timing Role: Bidirectional analog switch providing signal continuity or break under software-controlled OE assertion. Use Value: Prevents bus contention and ground bounce during insertion/removal while preserving nanosecond-level timing alignment. | Use Scenario: Routing address/data between dual-channel DDR memory controllers and shared SDRAM banks. IC Role / Device Role / Timing Role: Low-latency gate controlling physical access to interleaved memory segments without introducing skew. Use Value: Enables deterministic memory access arbitration with <0.25 ns added delay, maintaining tight tAC timing budgets. |
| Low-Distortion Signal Gating | Legacy Interface Bridging |
Use Scenario: Enabling/disabling analog sensor outputs or RF front-end signals in test equipment with minimal harmonic distortion. IC Role / Device Role / Timing Role: Analog-transparent switch maintaining signal fidelity across DC–100 MHz due to low ron and Cio. Use Value: Delivers <−60 dBc THD at 10 MHz with 1 Vpp swing, avoiding active amplification or filtering stages. | Use Scenario: Interfacing 3.3-V FPGA I/O banks with 5-V industrial PLC modules using shared control/data buses. IC Role / Device Role / Timing Role: Voltage-agnostic bus switch eliminating need for discrete level-shifter ICs or resistor networks. Use Value: Supports simultaneous 0.8–5 V signaling levels on same pins, reducing BOM count and PCB real estate by >40% vs. translator solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384CDBQR | Includes integrated 5-V tolerant level-shifting capability; higher ron (5 Ω typ); supports 3.3-V input driving 5-V bus. | Required where bidirectional level translation (e.g., 3.3-V MCU ↔ 5-V peripheral) is needed alongside switching. | Select when voltage domain bridging is mandatory; not drop-in due to different VIH/VIL thresholds and higher capacitance. |
| SN74LVC1G3157DCKR | Single-pole double-throw (SPDT) 2-channel switch; lower ron (0.5 Ω); 1.65–5.5 V operation; only 2 I/O pairs per device. | Suitable for point-to-point signal routing rather than multi-bit bus isolation; lacks dual 5-bit structure and undershoot protection. | Choose for compact single-line gating; unsuitable for 10-bit parallel bus applications or environments with −2 V transients. |
Compared with SN74CBT3384CDBQR, SN74CBTD3384CDBQR adds level translation at the cost of higher ON-resistance and reduced speed, while SN74LVC1G3157DCKR offers superior ron and smaller footprint but cannot replace the 10-bit bus-switching function or undershoot-hardened operation.
Availability
SN74CBT3384CDBQR is available at Aetrix Electronics and suitable for PCI interface design, memory subsystem isolation, and mixed-voltage industrial control systems requiring stable component supply across extended production lifecycles.
Supply support for SN74CBT3384CDBQR 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 company specializing in analog, embedded processing, and digital signal technologies, with over 50 years of leadership in high-reliability interface solutions.
The SN74CBT3384CDBQR belongs to TI's CBT (Crossbar Bus Transceiver) family, engineered for ultra-low-latency, bidirectional bus switching in high-speed digital systems where signal integrity and power-domain independence are critical.
FAQ
What is the maximum undershoot voltage the SN74CBT3384CDBQR can withstand on its A/B ports?
The SN74CBT3384CDBQR provides active undershoot protection up to −2 V on both A and B ports, verified per the SCDS132A datasheet. This protection ensures the switch remains reliably OFF during negative transients, preventing unintended conduction or damage. The feature is implemented via internal sensing circuitry and applies regardless of VCC state, making SN74CBT3384CDBQR suitable for hot-plug and cable-disconnect scenarios in industrial and telecom infrastructure.
Does the SN74CBT3384CDBQR support partial-power-down operation, and how is it implemented?
Yes, the SN74CBT3384CDBQR supports partial-power-down operation via its Ioff feature. When VCC = 0 V, Ioff limits current flow to ≤10 µA even if I/O pins are biased up to 5.5 V, preventing damaging backflow. This behavior is intrinsic to the device's FET structure and requires no external components. For proper startup sequencing, OE pins should be tied to VCC through a pullup resistor to guarantee high-impedance state until power stabilizes - a requirement explicitly documented for SN74CBT3384CDBQR in TI's application guidance.
What is the ON-state resistance (ron) specification for the SN74CBT3384CDBQR, and how does it vary with operating conditions?
The SN74CBT3384CDBQR has a typical ON-state resistance of 3 Ω at VCC = 4.5 V, IO = 30 mA, and VI = 0 V, with a maximum of 6 Ω across temperature and voltage extremes. At VCC = 4 V and IO = 64 mA, ron remains ≤12 Ω. This low, predictable resistance minimizes voltage drop and heating in high-current data paths. The value is measured differentially between A and B terminals and reflects the lower of the two node voltages - a key detail confirmed in the SCDS132A electrical characteristics table for SN74CBT3384CDBQR.
Can the SN74CBT3384CDBQR be used for analog signal switching, and what parameters validate that capability?
Yes, the SN74CBT3384CDBQR is qualified for analog signal switching due to its flat ron over voltage range, low OFF-capacitance (5 pF), and absence of CMOS threshold-dependent behavior. Its 3 Ω typical ron introduces <10 mV drop at 3 mA, and Cio(OFF) = 5 pF limits bandwidth degradation in audio and sensor signal paths. The device exhibits no charge injection or break-before-make artifacts, as confirmed by TI's characterization of SN74CBT3384CDBQR in analog multiplexer applications such as test equipment and data acquisition front ends.
What package type and dimensions does the SN74CBT3384CDBQR use, and is it RoHS-compliant?
The SN74CBT3384CDBQR uses the SSOP-24 (DBQ) package: 7.9 mm × 6.2 mm × 1.2 mm max height, 0.65 mm lead pitch, with 24 gull-wing leads. It is RoHS-compliant (lead-free NIPDAU finish) and rated MSL Level-2-260°C-1 year per JEDEC J-STD-020. This package is distinct from the larger DW (SOIC) and narrower DGV (TVSOP) variants - the DBQ footprint is explicitly assigned to SN74CBT3384CDBQR in TI's packaging addendum and verified in the device's orderable part number documentation.
SN74CBT3384CDBQR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 5 x 1:1
- Independent Circuits:
- 2
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
SN74CBT3384CDBQR FAQ
1.How can I place an order for SN74CBT3384CDBQR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3384CDBQR 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 SN74CBT3384CDBQR reliable?
The price and inventory of SN74CBT3384CDBQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3384CDBQR is usually 5 days.
3.What payment methods are accepted for SN74CBT3384CDBQR?
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4.How is shipping managed for SN74CBT3384CDBQR?
SN74CBT3384CDBQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3384CDBQR 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 SN74CBT3384CDBQR?
For technical support, including SN74CBT3384CDBQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3384CDBQR requirements.
6.How does Aetrix verify that SN74CBT3384CDBQR is sourced from the original manufacturer or authorized distributors?
All SN74CBT3384CDBQR 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 SN74CBT3384CDBQR meets industry standards.
7.What is the process for return or replacement of SN74CBT3384CDBQR?
All SN74CBT3384CDBQR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3384CDBQR, 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 SN74CBT3384CDBQR part is unused and in its original packaging.
Return procedure for SN74CBT3384CDBQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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