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Texas Instruments SN74CBT6800DBLE
- Part No.:
- SN74CBT6800DBLE
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
SN74CBT6800DBLE.pdf
- Description:
- BUS DRIVER
- Quantity:
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Inventory:5,000
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Product details
Overview
SN74CBT6800DBLE from Texas Instruments is a 10-bit FET bus switch with precharged B-port outputs for live insertion, featuring 5-Ω on-state resistance, TTL-compatible inputs, and operation from –40°C to 85°C. It enables bidirectional signal routing between A and B ports with near-zero propagation delay (0.25 ns max at VCC = 5 V) in hot-swap backplane and modular system applications.
For engineers reviewing the SN74CBT6800DBLE datasheet, SN74CBT6800DBLE pinout, SN74CBT6800DBLE application, or SN74CBT6800DBLE equivalent, key selection criteria include on-resistance stability across voltage range (4–5.5 V), BIASV-controlled precharge functionality, thermal impedance (104°C/W for DB package), and live-insertion noise suppression capability.
Technical Context
The SN74CBT6800DBLE implements a single 10-bit bidirectional FET switch controlled by an active-low ON\ input. When enabled, it establishes low-distortion signal paths with ron ≤ 7 Ω and tpd ≤ 0.25 ns at 5 V; when disabled, the B port is actively precharged to a user-supplied BIASV (1.3 V to VCC) via an internal ~10-kΩ equivalent resistor.
This architecture supports hot-plug compatibility in modular computing systems by eliminating floating-bus transients. Its TTL-level control interface and 50-pF load switching performance are specified across full industrial temperature range without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical, ≤7 Ω max - ensures minimal voltage drop and signal attenuation in high-speed data paths. |
| Propagation delay (tpd) | 0.25 ns max at VCC = 5 V - enables sub-nanosecond timing integrity in synchronous bus architectures. |
| Supply voltage (VCC) | 4.0 V to 5.5 V - compatible with standard 5-V TTL and mixed-voltage 3.3/5-V system interfaces. |
| Bias voltage (BIASV) | 1.3 V to VCC - user-selectable precharge level to match termination or reduce ground bounce during insertion. |
| Operating temperature | –40°C to +85°C - qualified for industrial-grade embedded and telecom equipment environments. |
| Input leakage current | ±5 µA max - guarantees stable enable/disable control under noisy or high-impedance PCB trace conditions. |
| Off-state capacitance (Co(OFF)) | 4.5 pF - minimizes capacitive loading and crosstalk when switch is disabled. |
Pinout & Package
SN74CBT6800DBLE uses a 24-pin Plastic Shrink Small-Outline (DB) package with 300-mil body width and standard JEDEC MO-153 footprint. Pin spacing is 0.65 mm, and package thickness is 1.2 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 24 | ON\ (Active-Low Enable) | Controls switch state: low = A↔B connected; high = A-B open, B precharged to BIASV. |
| 2–11 | A1–A10 | Port A bidirectional data terminals - connect to upstream bus or controller side. |
| 13–22 | B1–B10 | Port B bidirectional data terminals - connect to hot-pluggable module or downstream side. |
| 12 | GND | Power ground reference for all internal FETs and bias circuitry. |
| 23 | VCC | Positive supply (4–5.5 V) powering switch core and precharge logic. |
| 13 | BIASV | User-supplied bias voltage (1.3 V to VCC) setting precharge level for B-port during disable. |
Key Features
| Feature | Design Value |
|---|---|
| Precharged B-port outputs | Reduces live-insertion noise by holding B1–B10 at user-defined BIASV instead of floating during hot-swap events. |
| Low on-state resistance | 5 Ω typical ensures <10 mV drop at 2 mA, preserving signal integrity in 5-V TTL and LVTTL buses. |
| TTL-compatible control | VIL ≤ 0.8 V / VIH ≥ 2.0 V allows direct interfacing with legacy 5-V microcontrollers and FPGA I/O without level shifters. |
| Bidirectional signal routing | No direction pin required - data flows A→B or B→A with identical timing and resistance characteristics. |
| Industrial temperature range | –40°C to +85°C operation verified per JEDEC JESD22-A108, supporting deployment in uncontrolled environments. |
Applications
| Modular Backplane Systems | Hot-Swappable I/O Cards |
|---|---|
|
Use Scenario: Inserting/removing daughter cards into a powered 5-V backplane without disrupting communication on adjacent slots. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating card-side signals (B-port) from main backplane (A-port) during insertion; precharges B-port to BIASV to suppress ground bounce. Use Value: Eliminates need for mechanical interlocks or power sequencing, enabling true plug-and-play operation in telecom and industrial chassis. |
Use Scenario: Enabling/disabling peripheral modules (e.g., serial, CAN, or GPIO expansion) in a field-deployed PLC while main CPU remains operational. IC Role / Device Role / Timing Role: Signal gate controlling data path between host processor bus and module interface; ON\ synchronized to firmware reset sequence. Use Value: Prevents bus contention and latch-up during module initialization, reducing firmware complexity and improving system robustness. |
| Memory Interleaving Interfaces | Legacy Bus Translation Bridges |
|
Use Scenario: Routing address/data lines between two memory banks in a dual-channel SDRAM controller where one bank may be powered down. IC Role / Device Role / Timing Role: Low-latency pass-through switch enabling dynamic reconfiguration of memory access paths without clock domain crossing. Use Value: Achieves <0.3 ns added delay-negligible vs. typical SDRAM tAC-preserving timing margins in high-bandwidth memory subsystems. |
Use Scenario: Interfacing 3.3-V FPGA I/O to legacy 5-V peripherals (e.g., EEPROM, UART) in mixed-voltage embedded designs. IC Role / Device Role / Timing Role: Level-tolerant bidirectional buffer using BIASV = 3.3 V to clamp B-port while A-port operates at 5 V. Use Value: Avoids discrete resistor networks or dedicated level translators, reducing BOM count and PCB area in space-constrained designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384DBR | 12-bit, dual-supply (VCCA = 2.3–3.6 V, VCCB = 3–5.5 V), no BIASV pin, higher ron (9 Ω typ). | Supports asymmetric voltage translation (e.g., 3.3-V FPGA ↔ 5-V peripheral); lacks live-insertion precharge. | Select when voltage-level translation is required over live-insertion noise suppression. |
| SN74CBTS3384PWR | 12-bit, higher drive strength (128 mA), 3.3-V only (VCC = 2.3–3.6 V), no BIASV, faster tpd (0.18 ns). | Optimized for low-voltage, high-speed digital systems (e.g., DDR memory buffers); not rated for 5-V operation. | Select for 3.3-V-only designs prioritizing speed and current drive over hot-swap capability. |
Compared with SN74CBT6800DBLE, SN74CBTD3384DBR adds dual-supply translation but removes precharge functionality, while SN74CBTS3384PWR improves speed and current handling at the cost of 5-V compatibility and live-insertion support-making SN74CBT6800DBLE uniquely suited for industrial hot-swap 5-V bus isolation.
Availability
SN74CBT6800DBLE is available at Aetrix Electronics and suitable for modular backplane systems, hot-swappable I/O cards, and memory interleaving interfaces requiring stable component supply and long-term industrial lifecycle support.
Supply support for SN74CBT6800DBLE 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 company founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial, automotive, and communications applications.
The SN74CBT6800DBLE belongs to TI's CBT (Crosspoint Bus Transceiver) family, designed specifically for high-speed, low-distortion bus switching in live-insertion and hot-swap systems operating at 5 V.
FAQ
What is the function of the BIASV pin on the SN74CBT6800DBLE?
The BIASV pin on the SN74CBT6800DBLE supplies a user-selectable bias voltage (1.3 V to VCC) that precharges the B-port outputs to minimize signal distortion and ground bounce during live insertion. When the ON\ input is high, the internal ~10-kΩ equivalent resistor pulls B1–B10 to BIASV, preventing floating states. This feature is critical for reliable hot-swap operation in modular systems and is explicitly defined in the SN74CBT6800DBLE datasheet's functional description and bias voltage specification table.
Is the SN74CBT6800DBLE pin-compatible with other CBT-family bus switches?
No, the SN74CBT6800DBLE is not pin-compatible with other CBT-family devices such as SN74CBTD3384 or SN74CBTS3384 due to differing pin assignments-including dedicated BIASV on pin 13 and unique ON\ placement on pin 1. The SN74CBT6800DBLE uses a 24-pin DB package with A1–A10 (pins 2–11), B1–B10 (pins 13–22), ON\ (pin 1), BIASV (pin 13), VCC (pin 23), and GND (pin 12), as confirmed in the official TI datasheet SCDS005J top-view diagram.
What is the maximum continuous current rating per channel for the SN74CBT6800DBLE?
The SN74CBT6800DBLE has a maximum continuous channel current rating of 128 mA per switch path, as specified in the Absolute Maximum Ratings table of the SCDS005J datasheet. This rating applies under steady-state DC conditions and is independent of switching frequency. Exceeding this value risks thermal overstress and permanent device degradation, and must be verified against actual application current profiles including peak transients.
Does the SN74CBT6800DBLE support bidirectional signal flow without external direction control?
Yes, the SN74CBT6800DBLE supports fully bidirectional signal flow between A and B ports without any direction-control pin. Its FET-based architecture provides symmetrical on-resistance (5 Ω typical) and propagation delay (0.25 ns max) in both directions. This is confirmed in the device description stating "bidirectional connections" and the logic diagram showing A1–A10 and B1–B10 as interchangeable signal paths when ON\ is asserted-no additional control logic is needed for direction management in the SN74CBT6800DBLE.
What is the thermal impedance (θJA) of the SN74CBT6800DBLE in its DB package?
The thermal impedance (θJA) of the SN74CBT6800DBLE in the DB package is 104°C/W, as specified in the Absolute Maximum Ratings section of the SCDS005J datasheet. This value is measured per JESD 51 standards and reflects junction-to-ambient performance under standard PCB mounting conditions (single-layer copper, 1-in² pad). Designers must use this parameter to calculate junction temperature rise under worst-case power dissipation to ensure operation within the –40°C to +85°C ambient range for the SN74CBT6800DBLE.
SN74CBT6800DBLE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- -
- Circuit:
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- Independent Circuits:
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- Current - Output High, Low:
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- Voltage Supply Source:
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- Voltage - Supply:
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- Operating Temperature:
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- Supplier Device Package:
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SN74CBT6800DBLE FAQ
1.How can I place an order for SN74CBT6800DBLE through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT6800DBLE 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 SN74CBT6800DBLE reliable?
The price and inventory of SN74CBT6800DBLE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT6800DBLE is usually 5 days.
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4.How is shipping managed for SN74CBT6800DBLE?
SN74CBT6800DBLE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT6800DBLE 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 SN74CBT6800DBLE?
For technical support, including SN74CBT6800DBLE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT6800DBLE requirements.
6.How does Aetrix verify that SN74CBT6800DBLE is sourced from the original manufacturer or authorized distributors?
All SN74CBT6800DBLE 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 SN74CBT6800DBLE meets industry standards.
7.What is the process for return or replacement of SN74CBT6800DBLE?
All SN74CBT6800DBLE units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT6800DBLE, 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 SN74CBT6800DBLE part is unused and in its original packaging.
Return procedure for SN74CBT6800DBLE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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