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Texas Instruments SN74CBTD3384DBR
- Part No.:
- SN74CBTD3384DBR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74CBTD3384DBR.pdf
- Description:
- IC BUS SWITCH 5 X 1:1 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,990
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Product details
Overview
SN74CBTD3384DBR from Texas Instruments is a 10-bit, high-speed, TTL-compatible bus switch IC with dual 5-bit independent channels, 5-Ω on-state resistance, ±1 µA max ICC, and level-shifting capability from 5-V inputs to 3.3-V outputs-used in mixed-voltage system interconnects between microcontrollers and peripheral buses.
For engineers reviewing the SN74CBTD3384DBR datasheet, SN74CBTD3384DBR pinout, SN74CBTD3384DBR application, or SN74CBTD3384DBR equivalent, key selection criteria include on-resistance stability across VCC (4.5–5.5 V), fast enable/disable timing (2.3–7 ns ten, 1.7–5.3 ns tdis), low input capacitance (3 pF), and SSOP-24 package compatibility with space-constrained industrial control and telecom backplane designs.
Technical Context
The SN74CBTD3384DBR implements two independent 5-bit bidirectional analog switches controlled by separate OE pins, enabling selective isolation of A↔B signal paths without propagation delay penalty. Its integrated diode-to-VCC structure supports true 5-V-to-3.3-V level shifting under fast-edge conditions.
Each channel operates with TTL-compatible control thresholds (VIL = 0.8 V, VIH = 2 V), maintains high-impedance off-state isolation (>10⁹ Ω), and sustains continuous 128 mA per channel while limiting thermal rise via θJA = 63°C/W in the DB package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance | 5 Ω typical - ensures minimal voltage drop and signal distortion during high-speed switching. |
| Supply voltage range | 4.5 V to 5.5 V - compatible with standard 5-V logic rails and tolerant of supply ripple. |
| Propagation delay | 0.25 ns typical - negligible added latency for clock/data paths in synchronous systems. |
| Enable time (ten) | 2.3 ns min / 7 ns max - enables rapid channel activation for burst-mode data transfers. |
| Disable time (tdis) | 1.7 ns min / 5.3 ns max - guarantees clean channel isolation before next signal transition. |
| Input capacitance | 3 pF - reduces loading on driving sources and preserves signal edge integrity. |
| Channel current rating | 128 mA continuous - supports robust drive capability for multiple downstream loads. |
Pinout & Package
SN74CBTD3384DBR uses a 24-pin SSOP (Shrink Small-Outline Package) with 0.65 mm pitch, 7.9 mm × 4.4 mm body size, and 1.2 mm max height-designed for fine-pitch PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Independent output-enable controls | Low-active enables respective 5-bit channel; high places port in high-Z state. |
| 1A1–1A5, 2A1–2A5 | Port A input/output terminals | Bidirectional I/O for first/second 5-bit bus segment; connected to B ports when OE low. |
| 1B1–1B5, 2B1–2B5 | Port B input/output terminals | Bidirectional I/O for complementary bus segment; electrically identical to A-side. |
| VCC | Power supply | 5-V nominal supply; powers internal switch FETs and level-shift diodes. |
| GND | Ground reference | Common return path for all signals and supply current; critical for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible control inputs | VIL = 0.8 V / VIH = 2 V - eliminates need for level translators on OE lines driven by legacy 5-V logic. |
| Integrated VCC clamp diode | Enables reliable 5-V-to-3.3-V level shifting without external components or timing penalties. |
| Dual independent 5-bit channels | Allows asymmetric enable/disable sequencing-e.g., isolate one peripheral bus while keeping another active. |
| Low on-capacitance (3.5 pF OFF) | Minimizes crosstalk and signal degradation in dense routing environments like FPGA carrier boards. |
| High off-isolation (>60 dB @ 10 MHz) | Prevents signal bleed-through between enabled and disabled channels in multi-drop configurations. |
Applications
| Industrial PLC Backplane Interconnect | Embedded Microcontroller Peripheral Expansion |
|---|---|
Use Scenario: Isolating legacy 5-V sensor interface modules from a 3.3-V ARM-based controller in modular automation racks. IC Role / Device Role / Timing Role: Bidirectional level-shifting bus switch managing data/address lines between voltage domains with sub-nanosecond delay. Use Value: Eliminates discrete level translators and reduces BOM count while maintaining signal integrity at 100-MHz bus rates. |
Use Scenario: Enabling dynamic reconfiguration of SPI/I²C peripherals on a shared bus without hardware redesign. IC Role / Device Role / Timing Role: Channel-selectable switch isolating inactive peripherals to prevent bus contention and leakage. Use Value: Supports hot-plug peripheral detection and power-gated subsystems with <7 ns enable response. |
| Telecom Line Card Signal Routing | Test Equipment Signal Path Switching |
Use Scenario: Multiplexing multiple 5-V FPGA I/O banks onto a common 3.3-V diagnostic bus in carrier-grade line cards. IC Role / Device Role / Timing Role: Low-Ron analog switch preserving rise/fall times for JTAG and boundary-scan signals. Use Value: Maintains signal fidelity up to 200 Mbps with <0.25 ns added propagation delay per path. |
Use Scenario: Building programmable signal routing matrices in automated test equipment for DUT interface adaptation. IC Role / Device Role / Timing Role: Precision-controlled switch enabling repeatable path selection with nanosecond timing repeatability. Use Value: Delivers consistent 5-Ω path resistance across temperature (−40°C to 85°C), ensuring measurement accuracy stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3384DBR | Higher on-resistance (7 Ω typ), no integrated level-shift diode - requires external biasing for 5-V-to-3.3-V operation. | Limited to same-voltage-domain switching unless augmented with external circuitry. | Choose when cost sensitivity outweighs level-shifting requirement and board area permits external diodes. |
| SN74LVC1G3157DCKR | Single-channel SPDT, 3.3-V only supply, 6 Ω Ron - lacks dual 5-bit architecture and 5-V tolerance. | Suitable only for point-to-point 3.3-V signal routing, not multi-bit bus isolation. | Select for ultra-low-power single-line switching where full bus-width capability is unnecessary. |
Compared with SN74CBTD3384DBR, SN74CBT3384DBR trades level-shifting integration for lower cost and wider availability, while SN74LVC1G3157DCKR offers smaller footprint and lower static current but cannot replace the 10-bit dual-channel functionality or 5-V input support required in mixed-voltage bus architectures.
Availability
SN74CBTD3384DBR is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded microcontroller peripheral expansion, and telecom line card signal routing requiring stable component supply and long-term lifecycle support.
Supply support for SN74CBTD3384DBR 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and industrial-grade performance.
The SN74CBTD3384DBR belongs to TI's CBTD family of high-speed bus switches, engineered specifically for low-latency, level-shifting interconnects in mixed-voltage digital systems operating from −40°C to 85°C.
FAQ
What is the maximum continuous current per channel for SN74CBTD3384DBR?
The SN74CBTD3384DBR supports up to 128 mA continuous current per channel under recommended operating conditions. This rating applies to each of the ten bidirectional switch paths and is validated across the full −40°C to 85°C temperature range with VCC = 4.5 V to 5.5 V. Exceeding this current may cause thermal derating or reliability degradation.
Does SN74CBTD3384DBR require external level-shifting components?
No, SN74CBTD3384DBR integrates a diode-to-VCC structure that enables direct 5-V-to-3.3-V level shifting without external components. When 5-V signals are applied to port A, the internal diode clamps ensure safe 3.3-V-compatible output levels at port B-provided VCC is set to 5 V and load conditions remain within datasheet limits.
Can SN74CBTD3384DBR operate with VCC = 3.3 V?
No, SN74CBTD3384DBR is specified only for VCC = 4.5 V to 5.5 V. Operation at 3.3 V falls outside recommended conditions and compromises TTL-compatible input thresholds, on-resistance stability, and level-shifting functionality. For 3.3-V-only systems, consider SN74LVC-series alternatives.
What is the thermal resistance (θJA) of the SN74CBTD3384DBR in its SSOP-24 package?
The SN74CBTD3384DBR in the DB (SSOP-24) package has a junction-to-ambient thermal resistance (θJA) of 63°C/W, measured per JESD 51-7 under standard JEDEC high-K board conditions. This value assumes proper PCB copper pour and airflow; actual thermal performance depends on layout and system-level cooling.
How does the enable timing of SN74CBTD3384DBR affect system-level synchronization?
SN74CBTD3384DBR provides guaranteed enable time (ten) of 2.3 ns minimum and 7 ns maximum, allowing precise synchronization with clock edges in high-speed digital systems. This tight timing window ensures deterministic channel activation-critical for avoiding metastability in FPGA-to-ASIC interconnects and real-time data acquisition paths using the SN74CBTD3384DBR.
SN74CBTD3384DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTD
- Package/Case:
- 24-SSOP (0.209", 5.30mm 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
SN74CBTD3384DBR FAQ
1.How can I place an order for SN74CBTD3384DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTD3384DBR 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 SN74CBTD3384DBR reliable?
The price and inventory of SN74CBTD3384DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTD3384DBR is usually 5 days.
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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 SN74CBTD3384DBR?
For technical support, including SN74CBTD3384DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTD3384DBR requirements.
6.How does Aetrix verify that SN74CBTD3384DBR is sourced from the original manufacturer or authorized distributors?
All SN74CBTD3384DBR 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 SN74CBTD3384DBR meets industry standards.
7.What is the process for return or replacement of SN74CBTD3384DBR?
All SN74CBTD3384DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTD3384DBR, 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 SN74CBTD3384DBR part is unused and in its original packaging.
Return procedure for SN74CBTD3384DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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