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Texas Instruments SN74CBT3384CDW
- Part No.:
- SN74CBT3384CDW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBT3384CDW.pdf
- Description:
- IC BUS SWITCH 5 X 1:1 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,851
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Product details
Overview
SN74CBT3384CDW 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 (ron), near-zero propagation delay (0.15 ns at VCC = 5 V), and undershoot protection up to −2 V on A/B ports - used for PCI interface isolation and memory interleaving in industrial backplanes.
For engineers reviewing the SN74CBT3384CDW datasheet, SN74CBT3384CDW pinout, SN74CBT3384CDW application, or SN74CBT3384CDW equivalent, key selection criteria include Ioff partial-power-down support, 0–5-V signal level compatibility across 0.8-V to 5-V logic families, and SOIC-24 package thermal performance (θJA = 46°C/W).
Technical Context
The SN74CBT3384CDW 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 segment. Each switch operates bidirectionally with no internal direction control logic.
Its undershoot-protection circuitry actively monitors A/B port voltages and forces the switch into OFF state during −2 V transients, while Ioff ensures no backflow current when VCC = 0 V. The device supports 0–5.5 V data I/O signaling regardless of VCC level (4–5.5 V), decoupling logic voltage domain from signal path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ON-state resistance (ron) | 3 Ω typical - enables low-voltage-drop signal pass-through for 128 mA max current per channel. |
| Propagation delay (tpd) | 0.15 ns at VCC = 5 V - preserves signal integrity in high-speed parallel bus applications like PCI. |
| Input/output capacitance (Cio(OFF)) | 5 pF typical - minimizes capacitive loading and distortion on isolated buses. |
| VCC operating range | 4 V to 5.5 V - compatible with 5-V TTL and mixed-voltage systems requiring stable supply margin. |
| Undershoot protection limit | −2 V on A/B ports - prevents false turn-on and latch-up during negative transient events. |
| Ioff leakage | 10 µA at VCC = 0 V - guarantees isolation and prevents power-rail contamination during partial power-down. |
| Supply current (ICC) | 3 µA max - supports ultra-low static power in always-on system management functions. |
Pinout & Package
SN74CBT3384CDW uses a 24-pin SOIC (DW) package with 300-mil body width, 1.27-mm pitch, and 46°C/W junction-to-ambient thermal resistance - optimized for through-hole and surface-mount industrial PCBs requiring moderate power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output-enable control | Drives associated 5-bit switch ON (low) or OFF (high); requires pull-up to VCC for power-up high-impedance safety. |
| 1A1–1A5, 2A1–2A5 | Port A data terminals | First/second 5-bit input/output group; bidirectional with no internal direction logic. |
| 1B1–1B5, 2B1–2B5 | Port B data terminals | Corresponding 5-bit output/input group; electrically mirrored to A-side for true bidirectional flow. |
| GND | Ground reference | Common return for all internal circuitry and clamp diodes; must be low-impedance for undershoot protection. |
| VCC | Power supply | Supplies internal bias and switch control; powers undershoot protection circuitry and Ioff logic. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional zero-delay switching | Enables transparent signal routing between A/B ports without direction control overhead or timing skew. |
| Undershoot protection (−2 V) | Prevents unintended conduction during negative transients - critical for hot-swap and ruggedized backplane designs. |
| Ioff partial-power-down support | Blocks current backflow when VCC = 0 V, allowing safe insertion/removal in live systems with powered buses. |
| Multi-voltage I/O compatibility | Accepts 0.8-V to 5-V logic levels on data pins independent of VCC, simplifying interfacing between mixed-supply domains. |
| TTL/CMOS control input compatibility | Accepts standard 3.3-V or 5-V CMOS and TTL outputs directly on OE pins - no level-shifting required. |
Applications
| PCI Bus Isolation | Memory Interleaving |
|---|---|
Use Scenario: Isolating legacy PCI add-in cards from motherboard resources during hot-plug or fault conditions. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling/disabling 32-bit address/data paths under OE control with sub-nanosecond latency. Use Value: Prevents bus contention and signal corruption during card insertion/removal while maintaining full bandwidth when enabled. |
Use Scenario: Dynamically routing memory address lines between dual banks in high-performance embedded controllers. IC Role / Device Role / Timing Role: Low-ron, low-capacitance switch enabling fast, distortion-free toggling of bank-select signals without added propagation delay. Use Value: Eliminates timing budget penalties from traditional buffer-based interleaving schemes, supporting >100 MHz clock domains. |
| Low-Distortion Signal Gating | Industrial Backplane Bus Segmentation |
Use Scenario: Enabling/disabling analog sensor signals or digital control lines in precision test equipment. IC Role / Device Role / Timing Role: Analog-capable FET switch preserving signal fidelity via 5 pF Cio(OFF) and 3 Ω ron - no DC offset or harmonic generation. Use Value: Maintains ±0.1% linearity over 0–5 V range and supports 100+ MHz small-signal bandwidth without external compensation. |
Use Scenario: Segmenting modular I/O backplanes in programmable logic controllers to isolate faulty modules. IC Role / Device Role / Timing Role: High-reliability bus isolator with −2 V undershoot tolerance and JESD 78 Class II latch-up immunity (>100 mA). Use Value: Survives industrial ESD events (2000-V HBM) and ground bounce transients, ensuring uptime in harsh factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384CDW | Includes bus-hold circuitry on all I/Os; higher ICC (10 µA max); same ron and pinout. | Preferred where floating-bus prevention is required without external pull-ups; adds ~0.5 ns delay. | Select SN74CBTD3384CDW only if bus-hold functionality is explicitly needed - otherwise SN74CBT3384CDW offers lower power and identical switching performance. |
| 74LVC1G3157GW | Single-pole double-throw (SPDT) analog switch; 5.5 Ω ron; 10 pF Cio(OFF); 5-V only operation. | Suitable for point-to-point signal routing, not multi-bit bus isolation; lacks Ioff and undershoot protection. | Use 74LVC1G3157GW only for single-channel analog/digital multiplexing; SN74CBT3384CDW remains mandatory for 10-bit parallel isolation with robustness features. |
Compared with SN74CBTD3384CDW, the SN74CBT3384CDW delivers 70% lower quiescent current and eliminates bus-hold-induced noise coupling; versus 74LVC1G3157GW, it provides 10-bit coordinated control, −2 V transient resilience, and guaranteed isolation during power loss - essential for system-level bus integrity.
Availability
SN74CBT3384CDW is available at Aetrix Electronics and suitable for PCI interface design, memory interleaving architectures, and industrial backplane segmentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant SOIC packaging.
Supply support for SN74CBT3384CDW 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 logic solutions, with decades of expertise in high-speed interface ICs and industrial-grade reliability.
The SN74CBT3384CDW belongs to TI's CBT (Crosspoint Bus Transceiver) logic family, engineered specifically for low-distortion, high-bandwidth bus isolation in computing, communications, and automation infrastructure.
FAQ
What is the maximum signal voltage supported by SN74CBT3384CDW on its A/B ports?
The SN74CBT3384CDW supports data I/O voltages from 0 V to 5.5 V on A and B ports - independent of VCC level - enabling interoperability with 0.8-V, 1.2-V, 1.5-V, 1.8-V, 2.5-V, 3.3-V, and 5-V logic families without level translation. This specification is confirmed in the recommended operating conditions table of the SCDS132A datasheet.
Does SN74CBT3384CDW support hot-swap or partial-power-down operation?
Yes, SN74CBT3384CDW supports partial-power-down via its Ioff feature: when VCC = 0 V, Ioff leakage is limited to 10 µA, preventing damaging current backflow from live buses into the unpowered device. This capability is validated per JESD 78 Class II latch-up testing and explicitly documented in the datasheet's description section.
What is the thermal resistance (θJA) of SN74CBT3384CDW in its SOIC-24 (DW) package?
The SN74CBT3384CDW in the DW package has a junction-to-ambient thermal resistance (θJA) of 46°C/W, as specified in the absolute maximum ratings table of the SCDS132A datasheet. This value assumes standard JEDEC 2-layer board conditions and enables reliable operation up to 85°C ambient with typical power dissipation below 100 mW.
Can SN74CBT3384CDW be used as a 10-bit switch or only as two 5-bit switches?
The SN74CBT3384CDW can be configured either as two independent 5-bit bus switches (using separate 1OE and 2OE controls) or as a single 10-bit switch (by tying 1OE and 2OE together). Its functional diagram and truth table confirm this dual-mode flexibility, with bidirectional conduction and identical electrical characteristics in both configurations.
What protection does SN74CBT3384CDW provide against negative voltage transients?
The SN74CBT3384CDW integrates active undershoot-protection circuitry that detects and responds to −2 V transients on A/B ports by forcing the switch into the OFF state - preventing false conduction and potential damage. This behavior is verified in the undershoot characteristics table and Figure 2 of the SCDS132A datasheet.
SN74CBT3384CDW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-SOIC
SN74CBT3384CDW FAQ
1.How can I place an order for SN74CBT3384CDW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3384CDW 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 SN74CBT3384CDW reliable?
The price and inventory of SN74CBT3384CDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3384CDW is usually 5 days.
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Once your SN74CBT3384CDW order is processed, you will receive an email with the shipment details and tracking number.
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5.How can I obtain technical support or documentation for SN74CBT3384CDW?
For technical support, including SN74CBT3384CDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3384CDW requirements.
6.How does Aetrix verify that SN74CBT3384CDW is sourced from the original manufacturer or authorized distributors?
All SN74CBT3384CDW 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 SN74CBT3384CDW meets industry standards.
7.What is the process for return or replacement of SN74CBT3384CDW?
All SN74CBT3384CDW units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3384CDW, 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 SN74CBT3384CDW part is unused and in its original packaging.
Return procedure for SN74CBT3384CDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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