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Texas Instruments SN74CBT6800CDWR
- Part No.:
- SN74CBT6800CDWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBT6800CDWR.pdf
- Description:
- IC BUS SWITCH 10 X 1:1 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,042
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Product details
Overview
SN74CBT6800CDWR from Texas Instruments is a 10-bit bidirectional FET bus switch with near-zero propagation delay (0.15 ns typical at 5 V), 3 Ω typical ON-state resistance, and active undershoot protection up to −2 V on both A and B ports. It supports live insertion in PCI hot-plug systems via B-port precharge to user-defined BIASV voltage and operates across 4 V to 5.5 V supply range.
For engineers reviewing the SN74CBT6800CDWR datasheet, SN74CBT6800CDWR pinout, SN74CBT6800CDWR application, or SN74CBT6800CDWR equivalent, key selection criteria include Ioff-enabled partial-power-down operation, 5.5 pF typical OFF-state I/O capacitance for low signal distortion, and SOIC-24 package compatibility with industrial bus isolation and memory interleaving designs.
Technical Context
This device implements TTL-compatible control logic with a single active-low ON input enabling bidirectional conduction between ten A–B channel pairs. Its internal FET architecture delivers rail-to-rail signal pass-through with no level-shifting-supporting 0–5 V signaling across 0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, and 5 V logic families without external biasing.
The BIASV terminal provides a user-configurable precharge voltage (0–VCC) applied through an internal ~10-kΩ path to the B port during high-impedance state, minimizing live-insertion noise by holding B lines near receiver threshold voltage. Undershoot-protection circuitry actively clamps A/B port voltages down to −2 V while maintaining OFF-state integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - Ensures compatibility with 5-V TTL and mixed-voltage systems while maintaining robust noise margin. |
| ron (Typ) | 3 Ω - Enables minimal voltage drop (<192 mV at 64 mA) and preserves signal integrity in high-speed data paths. |
| tpd (Typ) | 0.15 ns at 5 V - Delivers near-instantaneous signal transfer critical for PCI and memory-bus timing budgets. |
| Cio(OFF) | 5.5 pF typical - Reduces capacitive loading on driven buses, limiting signal rise/fall time degradation and crosstalk. |
| Ioff | 10 µA max at VCC = 0 V - Prevents backflow current during partial power-down, protecting powered subsystems from unpowered ICs. |
| Undershoot Protection | −2 V on A/B ports - Maintains OFF-state isolation during connector mating events, eliminating false triggering in hot-plug environments. |
| BIASV Range | 0 V to VCC - Allows precise matching to receiver input thresholds (e.g., 1.2 V for LVCMOS, 2.4 V for TTL) to suppress live-insertion glitches. |
Pinout & Package
SN74CBT6800CDWR uses a 24-pin SOIC (DW) package measuring 7.5 mm × 15.4 mm × 2.3 mm (max height), compliant with JEDEC MS-013, with gull-wing leads and RoHS-compliant NiPdAu finish. Moisture sensitivity level is Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A10 | Data input/output (A-side) | 10 bidirectional channels connected to B1–B10 when ON = low; high-Z when ON = high. |
| B1–B10 | Data input/output (B-side) | 10 bidirectional channels precharged to BIASV during high-Z state to suppress live-insertion noise. |
| ON | Active-low enable input | Drives all 10 switches simultaneously; must be pulled up to VCC during power-up/down to ensure high-Z default. |
| BIASV | Bias voltage reference | User-supplied voltage (0–VCC) setting precharge level for B-port termination; not a control signal. |
| VCC | Positive supply | 4–5.5 V main power rail; powers internal FETs and protection circuitry. |
| GND | Ground reference | Common return path for VCC, BIASV, and all I/O signals. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional zero-delay switching | 0.15 ns typical propagation delay enables transparent data flow in PCI and memory-bus applications without timing compensation. |
| Live-insertion noise suppression | B-port precharge to BIASV minimizes glitch amplitude during card insertion/removal by avoiding receiver threshold crossing. |
| Robust undershoot immunity | Active −2 V clamping on A/B ports prevents latch-up and false logic transitions during connector bounce or ESD transients. |
| Ioff partial-power-down support | 10 µA max leakage at VCC = 0 V isolates unpowered sections of backplanes or modular systems without damaging current flow. |
| Mixed-voltage interface capability | 0–5 V I/O tolerance allows direct connection between 1.8 V, 2.5 V, 3.3 V, and 5 V domains without level shifters. |
Applications
| PCI Hot-Plug Interface | Memory Interleaving System |
|---|---|
Use Scenario: Inserting/removing expansion cards into live PCI backplanes without disrupting system operation. IC Role / Device Role / Timing Role: Bus switch isolating card-side signals from motherboard bus during mating; BIASV set to match PCI receiver thresholds (~2.0 V). Use Value: Eliminates bus glitches caused by parasitic capacitance discharge, preventing spurious interrupts or data corruption during hot-swap events. | Use Scenario: Dynamically routing address/data between two memory banks controlled by separate controllers. IC Role / Device Role / Timing Role: Low-latency bidirectional gate enabling fast bank switching with sub-nanosecond propagation delay and minimal skew. Use Value: Maintains tight timing margins in DDR/SDRAM interleaved architectures where signal integrity and delay consistency are critical. |
| Industrial Bus Isolation | Low-Distortion Signal Gating |
Use Scenario: Electrically separating noisy motor-control or sensor I/O sections from clean MCU communication buses. IC Role / Device Role / Timing Role: High-impedance barrier during fault conditions; low-ron path during normal operation to preserve analog/digital signal fidelity. Use Value: Prevents ground loops and noise coupling while supporting full-speed 5 V digital signaling with <5.5 pF loading per channel. | Use Scenario: Enabling/disabling audio or video data streams in multimedia SoC interconnects without introducing jitter or attenuation. IC Role / Device Role / Timing Role: Analog-capable FET switch passing AC-coupled signals with flat frequency response up to 500 MHz (based on ron/Cio bandwidth). Use Value: Delivers <0.01% THD+N in line-level audio paths and preserves edge integrity in 100 Mbps+ digital video links. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD6800CDWR | Includes integrated 5-V tolerant level-shifting; higher 5.5-V absolute max rating on I/O pins. | Required when interfacing 3.3-V controllers to 5-V peripherals without external translators. | Choose SN74CBTD6800CDWR only if level translation-not just isolation-is needed; otherwise SN74CBT6800CDWR offers lower cost and identical switching performance. |
| SN74LVC1G3157DCKR | Single-channel SPDT switch; 5.5-V supply; 6 Ω ron; no BIASV or undershoot protection. | Suitable for point-to-point signal routing but lacks multi-bit coordination, live-insertion features, or PCI compliance. | Use SN74LVC1G3157DCKR for simple signal multiplexing; select SN74CBT6800CDWR for synchronized 10-bit bus gating with hot-plug robustness. |
Compared with SN74CBTD6800CDWR, the SN74CBT6800CDWR omits level shifting but delivers identical ron, tpd, and BIASV functionality at lower unit cost; versus SN74LVC1G3157DCKR, it provides coordinated 10-bit control, undershoot protection, and proven PCI hot-plug qualification-making it irreplaceable in backplane and modular system designs.
Availability
SN74CBT6800CDWR is available at Aetrix Electronics and suitable for PCI hot-plug interfaces, memory interleaving systems, and industrial bus isolation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74CBT6800CDWR 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 high-reliability components for industrial, automotive, and communications markets.
The SN74CBT6800CDWR belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for low-distortion, low-latency signal gating in hot-pluggable computing and memory subsystems.
FAQ
What is the maximum undershoot voltage the SN74CBT6800CDWR can withstand on its A and B ports?
The SN74CBT6800CDWR provides active undershoot protection up to −2 V on both A and B ports, as verified in the absolute maximum ratings and functional test conditions. This capability ensures reliable OFF-state isolation during connector mating events or transient faults without compromising device integrity or downstream logic states. The SN74CBT6800CDWR maintains this specification across its full operating temperature range of −40°C to 85°C.
Does the SN74CBT6800CDWR support partial-power-down operation, and how is it implemented?
Yes, the SN74CBT6800CDWR supports partial-power-down operation via its Ioff feature, which limits leakage current to 10 µA maximum when VCC = 0 V. This design prevents damaging backflow current from live I/O lines into an unpowered device, enabling safe integration into modular systems where subsystems may be powered independently. The SN74CBT6800CDWR achieves this through internal transistor cutoff logic that isolates the switch matrix from floating supply rails.
What is the role of the BIASV pin on the SN74CBT6800CDWR, and what voltage range is valid?
The BIASV pin on the SN74CBT6800CDWR supplies a user-selectable precharge voltage to the B port during high-impedance state, reducing live-insertion noise by holding B lines near receiver input thresholds. Valid BIASV range is 0 V to VCC (i.e., 0–5.5 V), and it must be externally sourced-never driven as a logic signal. The SN74CBT6800CDWR uses an internal ~10-kΩ path to apply this bias, ensuring predictable settling without loading external sources.
Can the SN74CBT6800CDWR interface between different logic voltage domains, such as 1.8 V and 3.3 V?
Yes, the SN74CBT6800CDWR supports 0–5 V signaling on all data I/Os, enabling direct interfacing between 1.8 V, 2.5 V, 3.3 V, and 5 V logic domains without external level shifters. Its rail-to-rail transmission architecture preserves signal swing and timing, while the 5.5 pF typical OFF-state capacitance minimizes cross-domain loading. The SN74CBT6800CDWR achieves this compatibility while maintaining full undershoot protection and Ioff functionality across all supported voltage combinations.
What package type and lead finish does the SN74CBT6800CDWR use, and is it RoHS compliant?
The SN74CBT6800CDWR uses a 24-pin SOIC (DW) package with NiPdAu lead finish, rated for moisture sensitivity Level-1 (unlimited floor life at ≤30°C/60% RH). It is fully RoHS compliant, with lead-free construction verified per JEDEC J-STD-020 and TI's material declarations. The SN74CBT6800CDWR is supplied in tape-and-reel format (2000 units per reel) with Q1 pin-1 orientation, meeting IPC-7351 land pattern standards for automated assembly.
SN74CBT6800CDWR 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 Switch
- Circuit:
- 10 x 1:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
SN74CBT6800CDWR FAQ
1.How can I place an order for SN74CBT6800CDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT6800CDWR 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 SN74CBT6800CDWR reliable?
The price and inventory of SN74CBT6800CDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT6800CDWR is usually 5 days.
3.What payment methods are accepted for SN74CBT6800CDWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT6800CDWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBT6800CDWR?
SN74CBT6800CDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT6800CDWR 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 SN74CBT6800CDWR?
For technical support, including SN74CBT6800CDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT6800CDWR requirements.
6.How does Aetrix verify that SN74CBT6800CDWR is sourced from the original manufacturer or authorized distributors?
All SN74CBT6800CDWR 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 SN74CBT6800CDWR meets industry standards.
7.What is the process for return or replacement of SN74CBT6800CDWR?
All SN74CBT6800CDWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT6800CDWR, 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 SN74CBT6800CDWR part is unused and in its original packaging.
Return procedure for SN74CBT6800CDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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