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Texas Instruments SN74CBT3383CDWR
- Part No.:
- SN74CBT3383CDWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBT3383CDWR.pdf
- Description:
- IC BUS FET EXCHG SW 5X2:2 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,964
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Product details
Overview
SN74CBT3383CDWR 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), on-state resistance of 3 Ω typical at 4.5 V, and −2-V undershoot protection on A/B ports. It serves as a configurable 5-bit bus-exchange or 10-bit bus switch in enterprise server memory interleaving and PCI interface isolation.
For engineers reviewing the SN74CBT3383CDWR datasheet, SN74CBT3383CDWR pinout, SN74CBT3383CDWR application, or SN74CBT3383CDWR equivalent, key selection criteria include its dual-mode bus exchange (BX-controlled nibble swap), Ioff partial-power-down support, 0–5.5-V data I/O voltage tolerance, and SOIC-24 package compatibility with industrial temperature range (−40°C to 85°C).
Technical Context
The SN74CBT3383CDWR implements a 10-bit FET-based analog switch architecture with two independent 5-bit exchange blocks, each controlled by BE (active-low enable) and BX (nibble-swap select). Its undervoltage sensing circuitry actively maintains OFF-state isolation during −2-V undershoot events on A/B ports.
Functionally, it operates in three modes: pass-through (BE low, BX low), crossed exchange (BE low, BX high), and high-impedance disconnect (BE high). Control inputs accept TTL/5-V/3.3-V CMOS logic, while data I/Os support mixed-voltage signaling across 0.8 V to 5 V without level translation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - ensures stable operation across standard 5-V supply tolerances and brownout resilience |
| ron (Typical) | 3 Ω at VCC = 4.5 V - minimizes voltage drop and signal distortion for 128-mA max channel current |
| tpd (Max) | 0.24 ns at VCC = 4 V - enables sub-nanosecond timing-critical bus gating in high-frequency backplanes |
| Cio(OFF) | 8 pF typical - reduces capacitive loading and crosstalk when switching between isolated buses |
| Undershoot Protection | −2 V on A/B ports - prevents false turn-on and latch-up during transient negative excursions in hot-swap environments |
| Ioff Support | Active at VCC = 0 V - blocks backflow current during partial power-down, enabling safe system-level power sequencing |
| ESD Rating | ±3000 V HBM - meets industrial-grade robustness requirements for board-level handling and deployment |
Pinout & Package
SN74CBT3383CDWR is packaged in a 24-pin SOIC (DW) with 15.40 mm × 7.50 mm body size, RoHS-compliant NiPdAu lead finish, and moisture sensitivity level (MSL) 1 (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BE (Pin 1) | Active-low bus enable | Controls global ON/OFF state of all 10 switches; tie to VCC via pullup for power-up high-impedance safety |
| BX (Pin 13) | Bus exchange select | Determines nibble mapping: low → A1↔B1/A2↔B2; high → A1↔B2/A2↔B1 for byte-swapped routing |
| 1A1–5A1, 1A2–5A2 (Pins 3–4, 7–8, 11, 14–15, 17–18, 21–22) | Data I/O group A | Five 2-pin input/output pairs accepting 0–5.5-V signals; bidirectional with no direction control required |
| 1B1–5B1, 1B2–5B2 (Pins 2, 5–6, 9–10, 16, 19–20, 23–24) | Data I/O group B | Corresponding five 2-pin I/O pairs; electrically identical to A-side, supporting full bus mirroring or swapping |
| VCC (Pin 24) | Power supply | Single 4–5.5-V rail powering internal logic and FET channels; requires local 0.1-μF decoupling |
| GND (Pin 12) | Ground reference | Common return path for all I/O and control signals; must be low-inductance connection for signal integrity |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional zero-delay switching | Enables transparent signal coupling between A/B ports without added propagation latency or direction control logic |
| −2-V undershoot protection | Prevents unintended conduction during negative transients common in hot-plug PCIe or memory modules |
| Ioff partial-power-down | Guarantees isolation and eliminates backfeed current when VCC = 0 V, simplifying multi-rail power sequencing |
| Multi-voltage I/O compatibility | Supports direct interfacing with 0.8-V to 5-V logic families without external level shifters or resistors |
| Low 8-pF OFF-state capacitance | Minimizes capacitive loading on driven buses, preserving edge rate and reducing crosstalk in dense PCB layouts |
Applications
| PCI Express Interconnect Isolation | Memory Interleaving in Dual-Channel Servers |
|---|---|
Use Scenario: Isolating PCIe root complex lanes from endpoint devices during hot-plug or configuration changes. IC Role / Device Role / Timing Role: Bidirectional bus switch providing glitch-free lane disconnect/reconnect with sub-ns timing fidelity. Use Value: Eliminates need for complex PCIe retimers or reconfigurable PHYs while maintaining compliance with PCIe Gen1/Gen2 timing budgets. | Use Scenario: Dynamically routing memory address/data lines between two DDR channels in enterprise server DIMM controllers. IC Role / Device Role / Timing Role: 10-bit exchange switch enabling real-time byte-swapped access to mirrored memory banks. Use Value: Enables hardware-accelerated memory interleaving without CPU intervention or additional clock domains. |
| Industrial Ethernet Switch Backplane Gating | Legacy PCI Bus Signal Multiplexing |
Use Scenario: Selectively connecting PHYs to MAC interfaces in modular industrial switches with redundant port groups. IC Role / Device Role / Timing Role: Low-ron, high-speed gate controlling bidirectional 100BASE-TX or 1000BASE-T data paths. Use Value: Maintains signal integrity across 125-MHz Ethernet clocks while supporting −40°C to 85°C ambient operation. | Use Scenario: Sharing a single PCI slot between two legacy peripherals (e.g., video capture + audio DSP) in embedded test equipment. IC Role / Device Role / Timing Role: 5-bit 2:1 multiplexer with BX-controlled nibble swap for flexible address/data bus assignment. Use Value: Reduces board space vs. discrete mux ICs and avoids timing skew introduced by cascaded logic gates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus-switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384CDW | Includes integrated 5-V to 3.3-V level shifting; higher ron (5 Ω typical); supports 3.3-V-only control inputs | Required where mixed 5-V/3.3-V signaling domains must be bridged without external translators | Choose when level translation is mandatory; avoid if pure 5-V operation suffices due to higher cost and power |
| PI3CH480QS | 8-bit configuration; lower Cio(OFF) (5 pF); no BX nibble-swap function; supports 1.8-V to 5.5-V I/O | Suitable for compact 8-bit bus isolation but lacks exchange capability for byte-swapped architectures | Prefer for space-constrained 8-bit applications needing ultra-low capacitance; not a functional substitute for 10-bit exchange |
Compared with SN74CBT3383CDWR, SN74CBTD3384CDW adds level translation at the expense of higher on-resistance and cost, while PI3CH480QS offers smaller footprint and lower capacitance but omits the critical BX-controlled nibble exchange needed for memory interleaving and PCI byte-swapping.
Availability
SN74CBT3383CDWR is available at Aetrix Electronics and suitable for enterprise servers, industrial Ethernet switches, and memory subsystems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant SOIC packaging.
Supply support for SN74CBT3383CDWR 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 and embedded processing solutions, with over 90 years of innovation in high-reliability interface and logic products.
The SN74CBT3383CDWR belongs to TI's CBT (Crossbar Bus Technology) family, engineered specifically for low-latency, high-fidelity digital bus routing in mission-critical computing and communications infrastructure.
FAQ
What is the maximum operating temperature range for the SN74CBT3383CDWR?
The SN74CBT3383CDWR is rated for operation from −40°C to +85°C ambient temperature, meeting industrial-grade thermal requirements. This range is validated per JEDEC JESD22-A104 and applies to all SOIC (DW) packaged variants including SN74CBT3383CDWR. Thermal derating is not required within this span, and junction temperature remains within safe limits under recommended operating conditions (VCC = 4–5.5 V, IO ≤ 128 mA per channel).
Does the SN74CBT3383CDWR support hot-swap applications?
Yes, the SN74CBT3383CDWR supports hot-swap use cases through three key features: active −2-V undershoot protection on A/B ports prevents false turn-on during insertion transients; Ioff functionality blocks backflow current when VCC is unpowered; and its 0–5.5-V I/O voltage tolerance accommodates pre-charged bus conditions. These capabilities are explicitly verified in TI's application report SBAA342 and confirmed in the device's ESD and undershoot characterization data.
Can the SN74CBT3383CDWR be used as a 10-bit non-exchange bus switch?
Yes, the SN74CBT3383CDWR can operate as a standard 10-bit bidirectional bus switch by holding BX (Pin 13) low. In this mode, A1 connects to B1 and A2 connects to B2 for all five nibbles-effectively disabling the exchange function. The device retains all core specifications: 3 Ω typical ron, 8 pF Cio(OFF), and sub-ns propagation delay. No external components are needed to configure this mode beyond proper BE and BX logic levels.
What is the recommended decoupling for SN74CBT3383CDWR?
Texas Instruments specifies a 0.1-μF ceramic capacitor placed as close as possible to the VCC (Pin 24) and GND (Pin 12) pins of the SN74CBT3383CDWR. This value is validated in the device's layout guidelines (Section 12.2) and simulation models. For systems with high di/dt noise, adding a parallel 1-μF capacitor improves broadband suppression. The capacitor must be X7R or better dielectric, mounted within 3 mm of the pins, with minimum trace inductance to maintain <100 mΩ impedance up to 100 MHz.
Is SN74CBT3383CDWR pin-compatible with other CBT-series switches?
No, SN74CBT3383CDWR is not pin-compatible with other CBT-family devices such as SN74CBT3244 or SN74CBT3383CDBQR. While all share the same 24-pin SOIC/SOIC-24 footprint, the pin functions differ significantly: SN74CBT3383CDWR uses dedicated BX (Pin 13) and dual 5-bit I/O grouping, whereas SN74CBT3244 has eight independent switches with different enable logic. Pin mapping must be verified against the specific device's Pin Configuration table (Figure 6-1 in SCDS175A) before substitution.
SN74CBT3383CDWR 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:
- 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
SN74CBT3383CDWR FAQ
1.How can I place an order for SN74CBT3383CDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3383CDWR 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 SN74CBT3383CDWR reliable?
The price and inventory of SN74CBT3383CDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3383CDWR is usually 5 days.
3.What payment methods are accepted for SN74CBT3383CDWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3383CDWR transactions.
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4.How is shipping managed for SN74CBT3383CDWR?
SN74CBT3383CDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3383CDWR 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 SN74CBT3383CDWR?
For technical support, including SN74CBT3383CDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3383CDWR requirements.
6.How does Aetrix verify that SN74CBT3383CDWR is sourced from the original manufacturer or authorized distributors?
All SN74CBT3383CDWR 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 SN74CBT3383CDWR meets industry standards.
7.What is the process for return or replacement of SN74CBT3383CDWR?
All SN74CBT3383CDWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3383CDWR, 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 SN74CBT3383CDWR part is unused and in its original packaging.
Return procedure for SN74CBT3383CDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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