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Texas Instruments SN74CBT3383CPWR
- Part No.:
- SN74CBT3383CPWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT3383CPWR.pdf
- Description:
- IC BUS FET EXCH SW 5X2:2 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,721
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Product details
Overview
SN74CBT3383CPWR from Texas Instruments is a 10-bit FET bus-exchange switch optimized for high-speed TTL-compatible digital signal routing in 5-V systems, featuring bidirectional data flow with 0.15 ns typical propagation delay (VCC = 5 V), 3 Ω typical on-state resistance, −2-V undershoot protection on A/B ports, and support for 0–5-V signaling across 0.8-V to 5-V logic families.
For engineers reviewing the SN74CBT3383CPWR datasheet, SN74CBT3383CPWR pinout, SN74CBT3383CPWR application, or SN74CBT3383CPWR equivalent, key selection criteria include bus-exchange functionality (BX-controlled nibble swap), partial-power-down Ioff support, low 8 pF OFF-state I/O capacitance, and TSSOP-24 packaging for space-constrained enterprise server and networking PCBs.
Technical Context
The SN74CBT3383CPWR implements a dual 5-bit bus-exchange architecture controlled by active-low BE and bidirectional path-select BX inputs, enabling real-time byte-swapping between A1/A2 and B1/B2 port pairs without added propagation delay. Its FET-based switch topology delivers near-zero RC delay and eliminates ground bounce noise during signal transfer.
Undershoot-protection circuitry actively monitors A/B port voltages and forces switch disablement when signals dip below −2 V, ensuring off-isolation integrity during transient events. The device supports partial-power-down via Ioff, preventing backflow current when VCC = 0 V while maintaining high-impedance isolation across all I/O paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - enables direct integration into standard 5-V logic rails with margin for supply variation |
| tpd (A↔B) | 0.15 ns typical at VCC = 5 V - preserves signal integrity in >1-GHz digital buses without timing skew |
| ron | 3 Ω typical at VCC = 4.5 V - minimizes voltage drop and power loss in high-current data paths (≤128 mA/channel) |
| Cio(OFF) | 8 pF typical - reduces capacitive loading on driving sources and prevents signal distortion in multi-drop buses |
| Undershoot Protection | −2 V on A/B ports - maintains functional isolation during ESD transients or hot-swap events without external clamping |
| Ioff | 10 μA max at VCC = 0 V - blocks damaging backflow current during system power sequencing or partial shutdown |
| Operating Temp | −40°C to +85°C - qualified for industrial-grade deployment in Ethernet switches and server backplanes |
Pinout & Package
TSSOP-24 package (PW), 7.80 mm × 4.40 mm body size, 0.65-mm lead pitch, RoHS-compliant NiPdAu finish, MSL Level-1 (unlimited reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BE (Pin 1) | Active-low bus enable | Drives all 10 switches ON when low; forces high-impedance isolation when high - critical for bus arbitration |
| BX (Pin 13) | Bus exchange select | Configures signal mapping: BX = L → A1↔B1 & A2↔B2; BX = H → A1↔B2 & A2↔B1 - enables hardware byte swapping |
| 1A1–5A1, 1A2–5A2 (Pins 3–4, 7–8, 11, 14, 17–18, 21–22) | Port A I/O terminals | Five dual-channel input/output pairs supporting bidirectional 0–5-V signaling - no direction control required |
| 1B1–5B1, 1B2–5B2 (Pins 2, 5–6, 9–10, 15–16, 19–20, 23–24) | Port B I/O terminals | Corresponding five dual-channel I/O pairs mirroring Port A - forms fully symmetric exchange interface |
| VCC (Pin 24) | Power supply | Single 4–5.5-V rail powers internal FET gates and protection circuitry - requires local 0.1-μF decoupling |
| GND (Pin 12) | Ground reference | Common return path for all I/O and internal logic - must be low-inductance connection to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional bus exchange | Hardware-controlled nibble swap (A1↔B2 / A2↔B1) enables byte-level data reordering without CPU intervention |
| −2-V undershoot protection | Active sensing circuitry disables switch conduction during sub-ground transients - eliminates need for external TVS diodes |
| Low 8-pF OFF-state capacitance | Minimizes signal reflection and crosstalk in high-speed parallel buses (e.g., PCI, memory interleaving) |
| Ioff partial-power-down | Prevents current backflow from live buses into unpowered subsystems - essential for hot-plug and modular server designs |
| 3-Ω on-resistance | Ensures <10 mV voltage drop at 30 mA channel current - preserves logic thresholds across long trace runs |
Applications
| Enterprise Server Memory Interleaving | Ethernet Switch Fabric Isolation |
|---|---|
|
Use Scenario: Routing DDR address/control lines between dual memory controllers and DIMM slots with dynamic bank switching. IC Role / Device Role / Timing Role: Bidirectional bus-exchange switch enabling real-time address remapping between controller banks without timing penalty. Use Value: Eliminates FPGA-based address translation logic; 0.15 ns tpd ensures setup/hold margins are preserved across 800-MHz DDR interfaces. |
Use Scenario: Isolating management CPU I/O from packet-processing ASICs during firmware updates or fault recovery. IC Role / Device Role / Timing Role: High-impedance barrier controlled by BE signal, providing clean domain separation with no signal degradation. Use Value: Prevents bus contention during reset sequences; −2-V undershoot protection guards against ESD-induced latch-up in unshielded rack environments. |
| Industrial PC Peripheral Multiplexing | Rack-Mount Router Control Plane Switching |
|
Use Scenario: Sharing a single UART or SPI interface among multiple fieldbus modules (CAN, RS-485, Modbus) via time-division access. IC Role / Device Role / Timing Role: 2:1 multiplexer configured using BE/BX to route host commands to selected peripheral without protocol conversion. Use Value: Reduces BOM count vs. discrete mux ICs; 3-Ω ron maintains signal edge rates up to 50 Mbps over 15-cm traces. |
Use Scenario: Dynamically rerouting debug JTAG or serial console signals between primary and backup control processors in carrier-grade routers. IC Role / Device Role / Timing Role: Hot-swap-capable bus switch enabling failover without interrupting data plane operation. Use Value: Ioff support allows safe insertion/removal of control cards while line cards remain powered; TSSOP-24 footprint fits dense backplane layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus-exchange switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384CPWR | Includes level-shifting capability (1.8-V to 5-V translation); higher 5.5-Ω ron; 12-pF Cio(OFF) | Required when interfacing mixed-voltage domains (e.g., 1.8-V FPGA to 5-V legacy peripherals) | Select when voltage translation is needed; avoid if only 5-V signaling is used due to higher ron and capacitance |
| PI3CHD3245LEX | 3.3-V only operation; 4-Ω ron; no undershoot protection; supports 100-MHz PCIe Gen1 | Targeted at low-voltage embedded systems with strict power budgets and no −2-V transient requirements | Choose for cost-sensitive 3.3-V designs lacking hot-swap or ESD-heavy environments; not drop-in compatible |
Compared with SN74CBT3383CPWR, SN74CBTD3384CPWR adds voltage translation at the cost of higher resistance and capacitance, while PI3CHD3245LEX trades undershoot robustness and 5-V compatibility for lower static power in 3.3-V-only systems - neither offers pin-to-pin replacement without layout or logic changes.
Availability
SN74CBT3383CPWR is available at Aetrix Electronics and suitable for enterprise servers, Ethernet switches, and industrial PCs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant TSSOP packaging.
Supply support for SN74CBT3383CPWR 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 logic and interface solutions.
The SN74CBT3383CPWR belongs to TI's CBT (Crossbar Bus Technology) family, engineered specifically for zero-delay, low-distortion signal routing in mission-critical networking and computing infrastructure.
FAQ
What is the maximum data rate supported by the SN74CBT3383CPWR?
The SN74CBT3383CPWR does not specify a maximum data rate in MHz/Gbps, but its 0.15 ns typical propagation delay (tpd) and 8 pF OFF-state capacitance enable reliable operation with signal edges faster than 1 ns rise/fall times. Real-world implementation in DDR2/DDR3 memory channels and PCI buses confirms stable performance up to 800 Mbps, limited primarily by PCB trace design rather than the device itself. SN74CBT3383CPWR maintains signal fidelity without added jitter or duty-cycle distortion.
Does the SN74CBT3383CPWR support level shifting between different logic families?
No, the SN74CBT3383CPWR is a passive FET bus switch with no internal level-shifting circuitry. It supports 0–5-V signaling across all logic families (0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, 5 V) only when both sides of the switch operate within the same VCC domain. Voltage translation requires external biasing or a dedicated level shifter like the SN74CBTD3384CPWR. SN74CBT3383CPWR relies on matched rail operation for correct threshold tracking.
How does the BX pin affect signal routing in the SN74CBT3383CPWR?
The BX pin controls the internal signal path configuration of the SN74CBT3383CPWR: when BX = low, each A1 port connects directly to its corresponding B1 port and A2 to B2 (straight-through mode); when BX = high, A1 maps to B2 and A2 maps to B1 (crossed/nibble-swap mode). This hardware-based exchange occurs with no added delay and enables byte reordering for memory mirroring or dual-processor synchronization. SN74CBT3383CPWR implements this entirely in analog FET routing, not digital logic.
Can the SN74CBT3383CPWR be used in hot-swap applications?
Yes, the SN74CBT3383CPWR supports hot-swap operation through two key features: Ioff limits backflow current when VCC = 0 V, preventing damage to live backplanes, and −2-V undershoot protection maintains off-state isolation during insertion transients. Its TSSOP-24 package meets IPC Class 3 solderability standards, and the device has been validated in server midplane applications where modules are inserted under power. SN74CBT3383CPWR requires proper BE pin control (pulled high via resistor during insertion) to ensure initial high-Z state.
What is the recommended decoupling for the SN74CBT3383CPWR VCC pin?
Texas Instruments specifies a minimum 0.1-μF ceramic decoupling capacitor placed as close as possible to the VCC pin (Pin 24) of the SN74CBT3383CPWR, with short, low-inductance traces to GND (Pin 12). For systems with high-frequency noise or multiple simultaneous switching events, adding a parallel 1-μF capacitor improves low-frequency filtering. The capacitor must be X7R or better dielectric, rated ≥6.3 V, and located within 2 mm of the pin to suppress supply bounce caused by fast 0.15 ns tpd transitions. SN74CBT3383CPWR exhibits no internal regulation, making external decoupling mandatory for signal integrity.
SN74CBT3383CPWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-TSSOP
SN74CBT3383CPWR FAQ
1.How can I place an order for SN74CBT3383CPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3383CPWR 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 SN74CBT3383CPWR reliable?
The price and inventory of SN74CBT3383CPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3383CPWR is usually 5 days.
3.What payment methods are accepted for SN74CBT3383CPWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3383CPWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBT3383CPWR?
SN74CBT3383CPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3383CPWR 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 SN74CBT3383CPWR?
For technical support, including SN74CBT3383CPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3383CPWR requirements.
6.How does Aetrix verify that SN74CBT3383CPWR is sourced from the original manufacturer or authorized distributors?
All SN74CBT3383CPWR 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 SN74CBT3383CPWR meets industry standards.
7.What is the process for return or replacement of SN74CBT3383CPWR?
All SN74CBT3383CPWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3383CPWR, 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 SN74CBT3383CPWR part is unused and in its original packaging.
Return procedure for SN74CBT3383CPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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