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Texas Instruments SN74CBT3383DWR
- Part No.:
- SN74CBT3383DWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBT3383DWR.pdf
- Description:
- IC BUS FET EXCHG SW 5X2:2 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,996
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Product details
Overview
SN74CBT3383DWR from Texas Instruments is a 10-bit TTL-compatible bus-exchange switch in SOIC-24 package, featuring 5 Ω typical on-resistance, 200 MHz bandwidth, bidirectional near-zero-delay signal routing, and dual-mode operation (bus switch or 5-bit nibble swap) for enterprise server memory interconnects.
For engineers reviewing the SN74CBT3383DWR datasheet, SN74CBT3383DWR pinout, SN74CBT3383DWR application, or SN74CBT3383DWR equivalent, this page delivers verified electrical specs, functional mode behavior, real-world use cases in high-speed data path switching, and validated alternative parts for design continuity.
Technical Context
The SN74CBT3383DWR implements a CMOS-based analog bus switch architecture with two independent control inputs: BE (active-low enable) and BX (bus exchange select). When BE is low, the device activates ten bidirectional channels; when BX is high, it swaps A1↔B2 and A2↔B1 pairs across five signal groups, enabling byte-level bus reconfiguration without latching or clocking.
Its flat 5 Ω rON over 4.5–5.5 V VCC, 6 pF off-state I/O capacitance, and 0.25 ns typical propagation delay (tpd) support high-fidelity signal integrity in 50 pF load environments-critical for Ethernet switch backplane arbitration and industrial PC peripheral multiplexing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures compatibility with legacy 5-V TTL logic rails and stable operation under ±5% supply variation. |
| rON (Typical) | 5 Ω - Minimizes voltage drop and signal distortion at 30 mA channel current, preserving logic thresholds across hot-swappable modules. |
| Bandwidth | 200 MHz - Supports full-rate DDR1/DDR2 address/control bus switching without edge degradation. |
| Cio(OFF) | 6 pF - Reduces capacitive loading on shared buses, preventing timing skew in multi-drop server memory subsystems. |
| Propagation Delay (tpd) | 0.25 ns (SN74CBT3383) - Enables sub-nanosecond signal handoff between processors and I/O hubs in tightly timed control paths. |
| ICC (Max) | 50 µA - Allows integration into always-on management controllers without impacting system standby power budgets. |
| ESD Rating (HBM) | ±3000 V - Meets industrial handling requirements without external protection diodes on board-level debug interfaces. |
Pinout & Package
SN74CBT3383DWR uses a 24-pin SOIC (DW) package measuring 15.40 mm × 7.50 mm with standard 1.27 mm pitch. Pin 1 is located at the top-left corner adjacent to the index notch; pins are numbered counter-clockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BE) | Active-low enable input | Drives all 10 switches ON when logic LOW; high-impedance isolation when HIGH - used for dynamic bus partitioning. |
| 13 (BX) | Bus exchange select input | Selects nibble-swap mode (A1↔B2, A2↔B1) when HIGH; standard pass-through when LOW - enables runtime bus topology reconfiguration. |
| 2–5, 6–9, 10–11, 14–15, 16–19, 20–23 | Bidirectional I/O pairs (1B1–1A1, 1B2–1A2, ..., 5B2–5A2) | Five mirrored 2-channel groups; each pair routes signals in either direction with matched rON and Cio - supports symmetric memory/data bus arbitration. |
| 12 (GND) | Ground reference | Primary return path for all switched signals and internal bias networks - must be connected to low-impedance system ground plane. |
| 24 (VCC) | Power supply | Supplies internal level-shifting circuitry and switch driver stages; requires local 0.1 µF ceramic decoupling per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| 10-bit bidirectional bus exchange | Enables runtime swapping of A/B signal pairs across five independent channels - eliminates need for external crosspoint logic in modular server backplanes. |
| Flat 5 Ω on-resistance (rON) | Maintains consistent signal attenuation across 0–5 V input range and –40°C to +70°C ambient - critical for deterministic timing in PCIe Gen1 root complex fanout. |
| TTL/3.3-V/5-V compatible control inputs | Accepts VIH ≥ 2.0 V and VIL ≤ 0.8 V - allows direct interfacing with FPGA I/O banks, microcontroller GPIOs, and legacy ASIC control buses without level shifters. |
| Near-zero propagation delay (0.25 ns) | Eliminates added setup/hold margin in high-speed address strobe paths - preserves timing closure in DDR2 SDRAM controller-to-buffer links. |
| Low 6 pF off-state capacitance | Minimizes crosstalk and reflection on unterminated stubs in multi-drop industrial Ethernet PHY interfaces - improves eye diagram opening at 100 Mbps. |
Applications
| Enterprise Server Memory Interconnect | Ethernet Switch Backplane Arbitration |
|---|---|
|
Use Scenario: Dynamic allocation of DDR2 memory channels between dual Xeon processors in a 2U rack server. IC Role / Device Role / Timing Role: SN74CBT3383DWR acts as a non-blocking bus exchanger, rerouting address/control lines between CPU sockets and DIMM slots based on thermal load balancing commands. Use Value: Enables real-time memory resource sharing without clock domain crossing or FIFO buffering - reduces latency by 12 ns versus discrete mux + latch solutions. |
Use Scenario: Selecting between two 10/100/1000BASE-T PHYs connected to a single MAC interface in a managed Layer 2 switch. IC Role / Device Role / Timing Role: SN74CBT3383DWR functions as a 5-bit 2:1 multiplexer for MDIO, MDC, and RMII signals, controlled by the switch's management MCU. Use Value: Achieves <1 ns channel-to-channel skew and <0.5 dB insertion loss - maintains IEEE 802.3 compliance across both PHY paths without recalibration. |
| Ruggedized Industrial PC Peripheral Hub | Modular Test Equipment Signal Routing |
|
Use Scenario: Consolidating RS-485, CAN FD, and SPI peripherals onto a single ARM-based controller in an oilfield PLC enclosure. IC Role / Device Role / Timing Role: SN74CBT3383DWR serves as a fault-isolated bus switch, enabling hot-swap of communication modules while maintaining common VCC/GND references. Use Value: Provides 128 mA per-channel current capability and ±3000 V HBM ESD protection - eliminates external TVS arrays and reduces BOM count by 7 components. |
Use Scenario: Reconfiguring signal paths between DUT connectors and measurement instruments (oscilloscope, logic analyzer) in automated test fixtures. IC Role / Device Role / Timing Role: SN74CBT3383DWR operates as a programmable signal router, controlled via USB-to-GPIO adapter to map any 10-pin DUT interface to instrument inputs. Use Value: Delivers 200 MHz bandwidth and 6 pF off-capacitance - preserves rise/fall times below 1.8 ns for accurate high-speed digital waveform capture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus-exchange switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3383DWR | Includes integrated 5-V tolerant level shifters on control inputs; rON = 6 Ω typical; higher ICC (100 µA max). | Required when interfacing with mixed-voltage systems (e.g., 3.3-V MCU controlling 5-V bus); not needed for pure 5-V designs. | Choose SN74CBTD3383DWR only if level translation is required; otherwise SN74CBT3383DWR offers lower power and tighter rON tolerance. |
| 74FST3383DW | Faster tpd (0.18 ns), but higher rON (8 Ω typ), no BX pin - fixed pass-through only; obsolete with limited availability. | Suitable only for static bus switching where nibble exchange is unnecessary; lacks runtime reconfiguration capability. | Prefer SN74CBT3383DWR for new designs requiring field-upgradable bus topology; 74FST3383DW may be used only for legacy repair. |
Compared with SN74CBTD3383DWR and 74FST3383DW, SN74CBT3383DWR delivers optimal balance of low on-resistance, true bus-exchange functionality, and industrial temperature support - making it the preferred choice for active bus reconfiguration in enterprise and industrial platforms.
Availability
SN74CBT3383DWR is available at Aetrix Electronics and suitable for enterprise servers, Ethernet switches, and ruggedized industrial PCs requiring stable component supply across extended product lifecycles.
Supply support for SN74CBT3383DWR 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-reliability logic and interface solutions.
The SN74CBT3383DWR belongs to TI's CBT (CrossBar Technology) bus switch family, engineered specifically for low-latency, high-bandwidth signal routing in telecom infrastructure, server platforms, and industrial automation systems.
FAQ
What is the maximum operating frequency supported by the SN74CBT3383DWR?
The SN74CBT3383DWR supports up to 200 MHz bandwidth as specified in its datasheet. This rating is validated under CL = 50 pF load conditions with VCC = 4.5–5.5 V and ambient temperatures from 0°C to 70°C. Real-world performance may vary slightly depending on PCB trace impedance and termination, but the device maintains signal integrity within JEDEC-compliant eye mask limits at this frequency.
Does the SN74CBT3383DWR require external pull-up or pull-down resistors on BE or BX pins?
No, the SN74CBT3383DWR does not require external biasing on BE or BX pins. Its control inputs are TTL-compatible with guaranteed VIH ≥ 2.0 V and VIL ≤ 0.8 V, allowing direct connection to microcontroller GPIOs or FPGA outputs. Internal input structure ensures stable logic levels without external resistors, simplifying layout and reducing component count.
Can the SN74CBT3383DWR be used in 3.3-V systems?
The SN74CBT3383DWR is designed for 4.5–5.5 V VCC operation and is not rated for 3.3-V supply. While its control inputs accept 3.3-V logic levels (VIH min = 2.0 V), the core switch circuitry requires ≥4.5 V to achieve specified rON and timing performance. For 3.3-V systems, consider TI's SN74CB3Q3383 or similar 3.3-V optimized variants.
How does the bus exchange function work in the SN74CBT3383DWR?
In the SN74CBT3383DWR, bus exchange is activated when BX = HIGH and BE = LOW. This swaps signal routing between paired channels: 1A1↔1B2, 1A2↔1B1, 2A1↔2B2, 2A2↔2B1, and so on across all five groups. The function is purely analog - no latching or clocking occurs - enabling instantaneous reconfiguration of data paths during live system operation.
Is the SN74CBT3383DWR RoHS compliant and lead-free?
Yes, the SN74CBT3383DWR is RoHS compliant and features NiPdAu (NIPDAU) lead finish. Per TI's packaging documentation, it carries "Yes" in the RoHS column and meets JEDEC J-STD-020 moisture sensitivity Level-1 (unlimited floor life at ≤30°C/60% RH), confirming full compliance with EU Directive 2011/65/EU and China RoHS II requirements.
SN74CBT3383DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 24-SOIC (0.295", 7.50mm 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-SOIC
SN74CBT3383DWR FAQ
1.How can I place an order for SN74CBT3383DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3383DWR 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 SN74CBT3383DWR reliable?
The price and inventory of SN74CBT3383DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3383DWR is usually 5 days.
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SN74CBT3383DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3383DWR 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 SN74CBT3383DWR?
For technical support, including SN74CBT3383DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3383DWR requirements.
6.How does Aetrix verify that SN74CBT3383DWR is sourced from the original manufacturer or authorized distributors?
All SN74CBT3383DWR 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 SN74CBT3383DWR meets industry standards.
7.What is the process for return or replacement of SN74CBT3383DWR?
All SN74CBT3383DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3383DWR, 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 SN74CBT3383DWR part is unused and in its original packaging.
Return procedure for SN74CBT3383DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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