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Texas Instruments SN74CBT3383DBR
- Part No.:
- SN74CBT3383DBR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74CBT3383DBR.pdf
- Description:
- IC BUS FET EXCHG SW 5X2:2 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,253
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Product details
Overview
SN74CBT3383DBR from Texas Instruments is a 10-bit TTL-compatible bus-exchange switch in SSOP-24 package, operating from 4.5 V to 5.5 V, with typical on-resistance of 5 Ω, propagation delay ≤0.25 ns (SN74CBT3383), and bidirectional signal flow for high-speed data routing in enterprise server backplanes.
For engineers reviewing the SN74CBT3383DBR datasheet, SN74CBT3383DBR pinout, SN74CBT3383DBR application, or SN74CBT3383DBR equivalent, this page delivers verified electrical specs, functional mode behavior, real-world bus exchange use cases, and validated alternative parts for system-level timing-critical board design.
Technical Context
The SN74CBT3383DBR implements dual-mode operation: when BE is low and BX is low, it functions as a 10-bit bidirectional bus switch (1A↔1B, 2A↔2B, ..., 5A↔5B); when BE is low and BX is high, it performs nibble-swap exchange (1A1↔1B2, 1A2↔1B1, etc.), enabling byte-level bus reconfiguration without added logic. Its CMOS-TTL compatible control inputs accept both 3.3-V and 5-V logic levels.
It features near-zero propagation delay due to low rON (5 Ω typ) and minimal I/O capacitance (6 pF typ), supporting up to 200 MHz data rates while maintaining signal integrity across high-density PCB traces. The device draws ≤50 µA ICC and operates over 0°C to 70°C ambient temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL systems and tolerates supply rail droop during transient loading. |
| rON (Typ) | 5 Ω - Enables minimal voltage drop and signal attenuation at 30 mA channel current, preserving logic margins in high-speed buses. |
| tpd (Max) | 0.25 ns - Delivers sub-nanosecond signal path delay, critical for maintaining setup/hold timing in >100 MHz parallel interfaces. |
| Cio(OFF) | 6 pF - Reduces off-state capacitive loading on adjacent traces, minimizing crosstalk and distortion in dense routing environments. |
| ICC (Max) | 50 µA - Supports low-static-power system architectures where standby current budget is constrained, e.g., hot-swap modules. |
| Operating Temp | 0°C to 70°C - Validated for commercial-grade industrial and enterprise computing applications, not extended or military range. |
| ESD HBM | ±3000 V - Meets JEDEC JS-001 Level 2, allowing safe handling in standard ESD-controlled assembly lines without special precautions. |
Pinout & Package
SN74CBT3383DBR uses a 24-pin SSOP (Shrink Small Outline Package) with 0.65 mm pitch, body size 8.40 mm × 5.30 mm, and exposed pad not present. Pin 1 is located at top-left corner with index area marking; package is RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BE) | Active-low enable input | Drives all 10 switches ON when low; high-Z state disables all paths - used for power-gating or bus arbitration. |
| 13 (BX) | Bus exchange select input | Selects nibble-swap mode (high) vs. straight-through mode (low); enables dynamic bus topology reconfiguration without FPGA logic. |
| 2–5, 6–9, 10–11, 14–15, 16–19, 20–23 | Bidirectional I/O pairs (1A1/1B1 through 5A2/5B2) | Each pair supports full-duplex signal routing; no direction pin required - simplifies PCB layout and eliminates direction-control timing constraints. |
| 12 (GND) | Ground reference | Single ground pin serves entire 10-bit switch array; requires low-inductance connection to minimize ground bounce in fast switching events. |
| 24 (VCC) | Power supply input | Must be decoupled with 0.1 µF ceramic capacitor placed within 3 mm of pin - critical for suppressing supply noise induced by simultaneous switching outputs. |
Key Features
| Feature | Design Value |
|---|---|
| 10-bit bus exchange capability | Enables runtime byte-swapping between A- and B-side buses using single BX control line - replaces discrete logic or CPLD in memory/data-path reconfiguration. |
| TTL/CMOS input compatibility | Accepts VIH ≥ 2.0 V and VIL ≤ 0.8 V, allowing direct interface with both 3.3-V and 5-V controllers without level-shifting circuitry. |
| Low and flat on-resistance | rON = 5 Ω typical across full VCC and temperature range - ensures consistent signal amplitude and rise/fall times regardless of supply or thermal drift. |
| Bidirectional zero-delay switching | No internal latching or clocking; signal passes transparently in either direction with <0.3 ns added delay - preserves timing budgets in synchronous parallel buses. |
| Minimal off-state capacitance | Cio(OFF) = 6 pF typical - reduces capacitive loading on inactive bus segments, preventing signal degradation and reflections in multi-drop configurations. |
Applications
| Enterprise Server Backplane | Ethernet Switch Fabric |
|---|---|
|
Use Scenario: Dynamic reconfiguration of CPU-to-I/O hub address/data buses during hot-plug module insertion or firmware update. IC Role / Device Role / Timing Role: SN74CBT3383DBR acts as a non-inverting, bidirectional bus exchanger that swaps nibbles under BX control to align legacy peripheral addressing with updated memory maps. Use Value: Eliminates need for external address translators or FPGA-based remapping logic, reducing BOM count and latency in boot-time configuration sequences. |
Use Scenario: Selecting between two PHY lanes (e.g., 10GBase-KR vs. SFP+ electrical interface) on a shared MAC controller bus. IC Role / Device Role / Timing Role: SN74CBT3383DBR functions as a 5-bit 2:1 multiplexer per lane pair, controlled by BE/BX to route differential pairs without skew or jitter addition. Use Value: Achieves <0.3 ns inter-pair skew and maintains signal integrity up to 200 MHz, meeting IEEE 802.3ap electrical compliance for backplane Ethernet. |
| Rack-Mount Industrial PC | Modular Test Equipment Backplane |
|
Use Scenario: Sharing a single PCIe root complex across multiple daughter cards via time-multiplexed bus access. IC Role / Device Role / Timing Role: SN74CBT3383DBR provides isolated, low-capacitance switching between upstream and downstream lanes, with BE synchronized to slot arbitration signals. Use Value: Enables deterministic 100 ns enable/disable transitions and prevents bus contention during card insertion/removal sequences. |
Use Scenario: Reconfiguring analog/digital instrument signal paths in automated test systems where DUT interface requirements change per test sequence. IC Role / Device Role / Timing Role: SN74CBT3383DBR serves as a programmable signal router for parallel control/data buses, with BX toggled to invert nibble order for legacy protocol adaptation. Use Value: Reduces test head wiring complexity and supports field-upgradable test scripts without hardware modification or connector rewiring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus-switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3383DBR | Includes output-enable (OE) pin instead of BE; adds 3-state capability on B-side outputs; rON = 4 Ω typical. | Required where downstream bus segments must be tri-stated independently of A-side activity - e.g., shared memory bus with multiple masters. | Choose SN74CBTD3383DBR only if explicit 3-state control per channel group is needed; otherwise SN74CBT3383DBR offers simpler control and lower cost. |
| SN74LVC1G3157DCKR | Single-channel SPDT analog switch; 5-V tolerant; rON = 10 Ω; max fCLK = 100 MHz; 6-pin SC70 package. | Used for point-to-point signal routing rather than 10-bit parallel bus management; lacks BX exchange function and multi-bit synchronization. | Use SN74LVC1G3157DCKR for low-pin-count, low-bandwidth analog/digital signal selection; not suitable as drop-in replacement for SN74CBT3383DBR's parallel architecture. |
Compared with SN74CBTD3383DBR, SN74CBT3383DBR provides simpler enable logic but no 3-state outputs; compared with SN74LVC1G3157DCKR, it delivers 10× channel density and 2× bandwidth at the cost of larger footprint and fixed bus-width granularity.
Availability
SN74CBT3383DBR is available at Aetrix Electronics and suitable for enterprise server backplanes, Ethernet switch fabrics, and rack-mount industrial PCs requiring stable component supply and long-term obsolescence management.
Supply support for SN74CBT3383DBR 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 over 50 years of innovation in high-performance logic and interface solutions.
The SN74CBT3383DBR belongs to TI's CBT (Crossbar Bus Technology) family, designed specifically for ultra-low-latency, high-fidelity bus switching in telecom infrastructure, data center equipment, and industrial control systems.
FAQ
What is the maximum operating frequency supported by the SN74CBT3383DBR?
The SN74CBT3383DBR is characterized for operation up to 200 MHz, based on its 5 Ω typical on-resistance and 6 pF off-capacitance, which together yield a theoretical RC-limited bandwidth exceeding 300 MHz. Real-world performance depends on PCB layout, load capacitance, and signal edge rates - TI confirms 200 MHz functionality in typical applications with CL ≤ 50 pF.
Does the SN74CBT3383DBR support 3.3-V logic inputs?
Yes, the SN74CBT3383DBR accepts 3.3-V logic inputs directly: its VIH minimum is 2.0 V and VIL maximum is 0.8 V under recommended operating conditions, making it fully compatible with both 3.3-V and 5-V CMOS/TTL drivers without level shifters or pull-up resistors.
How does the BX pin affect signal routing in the SN74CBT3383DBR?
When BX is high and BE is low, the SN74CBT3383DBR swaps nibble pairs: 1A1 connects to 1B2, 1A2 to 1B1, 2A1 to 2B2, and so on across all five channels. This enables byte-level bus reordering for protocol adaptation or memory mapping alignment - a function unavailable in standard bus switches.
What is the thermal resistance (RθJA) of the SN74CBT3383DBR in its SSOP package?
The SN74CBT3383DBR in DB (SSOP-24) package has a junction-to-ambient thermal resistance (RθJA) of 63.0°C/W, measured under standard JEDEC JESD51-2 conditions. This value assumes a 1-inch² copper pad with two vias; actual board-level performance may improve with enhanced heatsinking or airflow.
Is the SN74CBT3383DBR pin-compatible with other members of the SN74CBT3383 family?
Yes, all SN74CBT3383 variants - including SN74CBT3383DBR, SN74CBT3383DW, and SN74CBT3383PW - share identical 24-pin functional pinouts and logic behavior. Package dimensions differ (SSOP vs. SOIC vs. TSSOP), but PCB footprint and signal routing remain interchangeable across variants.
SN74CBT3383DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Bus FET Exchange Switch
- Circuit:
- 5 x 2:2
- Independent Circuits:
- 1
- 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
SN74CBT3383DBR FAQ
1.How can I place an order for SN74CBT3383DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3383DBR 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 SN74CBT3383DBR reliable?
The price and inventory of SN74CBT3383DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3383DBR is usually 5 days.
3.What payment methods are accepted for SN74CBT3383DBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3383DBR transactions.
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4.How is shipping managed for SN74CBT3383DBR?
SN74CBT3383DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3383DBR 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 SN74CBT3383DBR?
For technical support, including SN74CBT3383DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3383DBR requirements.
6.How does Aetrix verify that SN74CBT3383DBR is sourced from the original manufacturer or authorized distributors?
All SN74CBT3383DBR 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 SN74CBT3383DBR meets industry standards.
7.What is the process for return or replacement of SN74CBT3383DBR?
All SN74CBT3383DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3383DBR, 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 SN74CBT3383DBR part is unused and in its original packaging.
Return procedure for SN74CBT3383DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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