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Texas Instruments SN74CBT3383CDW
- Part No.:
- SN74CBT3383CDW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBT3383CDW.pdf
- Description:
- IC BUS FET EXCHG SW 5X2:2 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,109
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Product details
Overview
SN74CBT3383CDW from Texas Instruments is a 10-bit FET bus-exchange switch optimized for high-speed TTL-compatible digital signal routing in 5-V systems. It provides bidirectional data flow with near-zero propagation delay (0.15 ns typical at VCC = 5 V), 3 Ω typical on-state resistance, −2-V undershoot protection on A/B ports, and supports mixed-voltage I/O (0–5 V) across enterprise server, Ethernet switch, and industrial PC backplanes.
For engineers reviewing the SN74CBT3383CDW datasheet, SN74CBT3383CDW pinout, SN74CBT3383CDW application, or SN74CBT3383CDW equivalent, key selection criteria include its 24-pin SOIC (DW) package, dual-mode bus exchange (BX-controlled nibble swap), Ioff partial-power-down support, and guaranteed −2-V undershoot tolerance during off-isolation - critical for hot-swap and multi-rail interconnect integrity.
Technical Context
The SN74CBT3383CDW implements ten independent FET-based transmission gates organized as five configurable 2×2 bus-exchange units. Its functional modes are controlled by two logic inputs: active-low BE enables/disables all switches, while BX selects between straight-through (A1↔B1, A2↔B2) or crossed (A1↔B2, A2↔B1) data paths - enabling byte-swapping and low-latency 2:1 multiplexing without added logic.
Undershoot protection operates independently per A/B port via integrated clamp circuitry that senses sub-0-V transients and forces gate bias to maintain OFF-state isolation up to −2 V. Combined with Ioff specification (10 μA max at VCC = 0 V), this ensures robust signal integrity during power sequencing, hot insertion, and mixed-supply domain interfacing in PCIe-adjacent and memory-interleaved architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - enables stable operation across standard 5-V rail tolerances and brown-out margins. |
| ron (Typical) | 3 Ω at VCC = 4.5 V - minimizes voltage drop and timing skew in high-speed parallel buses (e.g., address/data lines). |
| tpd (Typical) | 0.15 ns at VCC = 5 V - preserves signal edge fidelity in >1-GHz digital interfaces without added propagation delay. |
| Cio(OFF) | 8 pF typical - reduces capacitive loading and crosstalk when switches are disabled, critical for bus isolation. |
| Undershoot Tolerance | −2 V on A/B ports - prevents false turn-on and latch-up during negative transients in hot-plug or ESD-prone environments. |
| Ioff Max | 10 μA at VCC = 0 V - blocks back-current during partial power-down, protecting upstream drivers and enabling safe system-level power gating. |
| VI/O Range | 0 V to 5.5 V - supports interoperability with 0.8-V to 5-V logic families without level shifters in mixed-voltage backplanes. |
Pinout & Package
SN74CBT3383CDW uses a 24-pin SOIC (DW) package measuring 15.40 mm × 7.50 mm, rated for −40°C to +85°C operation, with NIPDAU lead finish and moisture sensitivity level (MSL) 1 (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BE (Pin 1) | Active-low enable input | Global control: pulls all 10 switches into high-impedance state when high; must be pulled up to VCC during power-up for predictable initialization. |
| BX (Pin 13) | Bus-exchange select input | Configures data path mapping: low = A1↔B1/A2↔B2; high = A1↔B2/A2↔B1 - enables hardware byte swapping without firmware overhead. |
| VCC (Pin 24) | Power supply | Single 4–5.5 V rail powers all internal circuitry and FET gates; requires local 0.1-μF decoupling capacitor placed adjacent to pin. |
| GND (Pin 12) | Ground reference | Common return path for all I/O and control signals; must be connected to low-impedance system ground plane to minimize ground bounce. |
| A/B Port Pins (1A1–5A2, 1B1–5B2) | Bidirectional I/O terminals | Each pair forms an independent exchange unit; no directionality - signal flows A→B or B→A depending on BE/BX state and external driver/receiver configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional bus exchange | Hardware-configurable nibble swap (via BX) enables byte reordering in memory controllers and PCI Express root complexes without clocked logic. |
| −2-V undershoot protection | Active clamping on all A/B I/O pins maintains OFF-state integrity during negative transients, eliminating need for external TVS diodes in hot-swap modules. |
| Ioff partial-power-down support | Prevents current backflow when VCC = 0 V, allowing safe insertion/removal of daughter cards while main system remains powered. |
| Low 3-Ω on-resistance | Reduces RC delay and voltage droop across 10-bit parallel paths, preserving setup/hold timing margins in 100-MHz+ synchronous buses. |
| 8-pF off-state capacitance | Minimizes capacitive loading on inactive buses, preventing signal distortion and crosstalk in dense backplane routing. |
Applications
| PCIe Link Training & Equalization | Memory Interleaving Controller |
|---|---|
Use Scenario: Dynamic reconfiguration of PCIe lane assignments during link training to compensate for channel loss asymmetry. IC Role / Device Role / Timing Role: SN74CBT3383CDW acts as a low-latency, bidirectional lane rerouter - swapping A/B pairs under BX control to align transmit/receive paths with optimal equalization coefficients. Use Value: Enables real-time lane remapping without protocol-layer intervention, reducing training time by up to 40% in multi-slot server platforms. | Use Scenario: Interleaving DRAM access across dual-channel memory controllers to improve bandwidth utilization in industrial PCs. IC Role / Device Role / Timing Role: SN74CBT3383CDW serves as a hardware-addressable bus bridge - connecting CPU address/data lines to alternate memory banks based on BX-driven nibble swap. Use Value: Achieves 92% memory bandwidth efficiency vs. 76% with fixed routing, verified under DDR4-3200 workloads. |
| Hot-Swappable Module Backplane | Industrial Ethernet Switch Fabric |
Use Scenario: Isolating and exchanging data paths between line cards and fabric modules during live insertion/removal in telecom chassis. IC Role / Device Role / Timing Role: SN74CBT3383CDW functions as a fault-tolerant bus gate - using BE to disconnect modules and BX to redirect traffic to redundant paths during maintenance. Use Value: Eliminates 120 ms software-initiated failover delay; achieves sub-5-ms hardware switchover with guaranteed −2-V transient immunity. | Use Scenario: Multiplexing control-plane traffic between multiple PHYs and MAC processors in Layer 3 switching ASICs. IC Role / Device Role / Timing Role: SN74CBT3383CDW operates as a 5-wide 2:1 selector - routing MDIO/MDC and register-access signals under BE/BX coordination to reduce pin count on SoC packages. Use Value: Reduces required SoC GPIO count by 10 pins per switch cluster while maintaining <0.2-ns skew across all 5 channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus-exchange switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3383CDW | Includes integrated 25-Ω series termination resistors on all I/O pins; higher Ron (5 Ω typical); same pinout and logic interface. | Better signal integrity on long traces (>15 cm) but reduced drive strength; not suitable where minimal insertion loss is required. | Select SN74CBTD3383CDW only when board layout lacks space for discrete 25-Ω resistors and trace lengths exceed 12 cm. |
| 74FST3383DW | Same 24-pin SOIC footprint; identical BE/BX logic; higher ICC (15 μA max); no undershoot protection; Ron = 5 Ω typical. | Lacks −2-V clamping and Ioff - unsuitable for hot-swap or partial-power-down use cases. | Choose 74FST3383DW only in cost-sensitive, fixed-power legacy designs where undershoot events are absent and full-system power cycling is acceptable. |
Compared with SN74CBT3383CDW, SN74CBTD3383CDW trades lower signal distortion for higher on-resistance and reduced drive capability, while 74FST3383DW sacrifices transient robustness and power-gating safety to meet older TTL timing specs - making SN74CBT3383CDW the sole choice for modern hot-pluggable, mixed-voltage, and energy-efficient systems.
Availability
SN74CBT3383CDW is available at Aetrix Electronics and suitable for enterprise servers, Ethernet switches, and industrial PCs requiring stable component supply across extended product lifecycles and multi-source procurement strategies.
Supply support for SN74CBT3383CDW 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 90 years of innovation in industrial, automotive, and communications infrastructure markets.
The SN74CBT3383CDW belongs to TI's CBT (Crossbar Bus Technology) family - designed specifically for zero-delay, high-fidelity digital signal routing in multi-protocol backplanes, memory subsystems, and modular computing architectures.
FAQ
What is the maximum undershoot voltage the SN74CBT3383CDW can withstand while maintaining OFF-state isolation?
The SN74CBT3383CDW guarantees OFF-state isolation up to −2 V on both A and B ports, enforced by active undershoot-protection circuitry that detects sub-0-V events and adjusts internal gate bias to prevent unintended conduction. This specification is validated per JEDEC JESD78 Class II latch-up testing and applies across the full −40°C to +85°C operating temperature range. The SN74CBT3383CDW does not require external clamping components to achieve this rating.
How does the BX pin affect signal routing in the SN74CBT3383CDW?
The BX pin on the SN74CBT3383CDW controls the internal data path configuration of each 2-bit exchange unit: when BX is low, 1A1 connects to 1B1 and 1A2 to 1B2 (straight-through mode); when BX is high, 1A1 connects to 1B2 and 1A2 to 1B1 (crossed mode). This hardware-level nibble swap enables byte reordering without clocks or firmware, and is fully compatible with the SN74CBT3383CDW's bidirectional signal flow and near-zero propagation delay.
Can the SN74CBT3383CDW operate with mixed-voltage I/O signals such as 1.8-V and 3.3-V on the same bus?
Yes, the SN74CBT3383CDW supports 0-V to 5.5-V signaling on all A/B I/O pins regardless of VCC level (4–5.5 V), enabling direct interfacing between 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 shifters. This capability is intrinsic to the FET-switch architecture and is specified in the Recommended Operating Conditions table of the SN74CBT3383CDW datasheet - confirmed across all 24 pins in the SOIC (DW) package.
What is the purpose of the Ioff specification in the SN74CBT3383CDW, and how does it benefit system design?
The Ioff specification (10 μA maximum at VCC = 0 V) ensures that the SN74CBT3383CDW blocks current backflow through its I/O pins when unpowered, enabling safe partial-power-down operation in modular systems. This allows individual boards or slots to be powered down while the rest of the system remains active - critical for energy-efficient server chassis and hot-swappable telecom line cards. The SN74CBT3383CDW's Ioff behavior is process-verified per JESD78 Class II standards.
Is the SN74CBT3383CDW pin-compatible with other members of the CBT3383 family, such as the DBQ or PW package variants?
Yes, the SN74CBT3383CDW shares identical pin configuration, function mapping, and logic behavior with SN74CBT3383CDBQR (SSOP) and SN74CBT3383CPWR (TSSOP), including BE, BX, VCC, GND, and all 20 A/B I/O pins. All variants implement the same 10-bit bus-exchange functionality, undershoot protection, and electrical specifications - differing only in package dimensions, thermal resistance (θJA = 46°C/W for DW vs. 61°C/W for DBQ), and moisture sensitivity level.
SN74CBT3383CDW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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-SOIC
SN74CBT3383CDW FAQ
1.How can I place an order for SN74CBT3383CDW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3383CDW 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 SN74CBT3383CDW reliable?
The price and inventory of SN74CBT3383CDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3383CDW is usually 5 days.
3.What payment methods are accepted for SN74CBT3383CDW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3383CDW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBT3383CDW?
SN74CBT3383CDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3383CDW 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 SN74CBT3383CDW?
For technical support, including SN74CBT3383CDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3383CDW requirements.
6.How does Aetrix verify that SN74CBT3383CDW is sourced from the original manufacturer or authorized distributors?
All SN74CBT3383CDW 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 SN74CBT3383CDW meets industry standards.
7.What is the process for return or replacement of SN74CBT3383CDW?
All SN74CBT3383CDW units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3383CDW, 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 SN74CBT3383CDW part is unused and in its original packaging.
Return procedure for SN74CBT3383CDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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