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Texas Instruments SN74CBT6800DWR
- Part No.:
- SN74CBT6800DWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
SN74CBT6800DWR.pdf
- Description:
- BUS DRIVER
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Product details
Overview
SN74CBT6800DWR 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) and supports user-selectable BIASV bias voltage (1.3 V to VCC) to suppress hot-swap transients in backplane and modular systems.
For engineers reviewing the SN74CBT6800DWR datasheet, SN74CBT6800DWR pinout, SN74CBT6800DWR application, or SN74CBT6800DWR equivalent, key selection criteria include on-resistance matching, live-insertion noise suppression capability, BIASV voltage range compatibility, and DW-package thermal performance (θJA = 81°C/W).
Technical Context
The SN74CBT6800DWR implements a single 10-bit bidirectional analog switch controlled by one active-low ON\ input. When enabled, it establishes low-impedance paths between A1–A10 and B1–B10 with typical ron of 5–7 Ω across VCC = 4–5.5 V. Its precharge circuitry connects B-port terminals to BIASV via ~10 kΩ equivalent resistance when disabled.
Switching behavior is defined by propagation delay (tpd ≤ 0.25 ns), enable/disable times (tPZH/tPLZ ≤ 8.6 ns), and output capacitance (Co(OFF) = 4.5 pF). Input clamp current (±50 mA) and absolute maximum ratings (VCC/BIASV up to 7 V) support robust hot-swap handling without external protection diodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5–7 Ω - ensures minimal signal attenuation and impedance matching in high-speed digital buses. |
| Propagation delay (tpd) | 0.25 ns max at VCC = 5 V - enables sub-nanosecond timing integrity in 100+ MHz bus architectures. |
| BIASV range | 1.3 V to VCC - allows precise precharge level tuning to match system logic thresholds and reduce ground bounce. |
| Supply voltage (VCC) | 4.0–5.5 V - compatible with standard 5-V TTL and mixed-voltage 3.3-V/5-V interface designs. |
| Operating temperature | –40°C to 85°C - qualified for industrial-grade embedded and telecom backplane applications. |
| Output capacitance (Co(OFF)) | 4.5 pF - limits capacitive loading during disable state, preserving signal integrity on shared bus lines. |
| Input leakage (II) | ±5 µA - minimizes standby current draw and avoids unintended switching in high-impedance control networks. |
Pinout & Package
SN74CBT6800DWR uses a 24-pin Small-Outline (DW) package with 300-mil body width and gull-wing leads. Thermal performance is characterized at θJA = 81°C/W, supporting moderate-power bus-switching in compact PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ON\ | Active-low enable input | Drives internal FET gate; low = connect A↔B, high = disconnect + precharge B to BIASV. |
| A1–A10 | Port A data terminals | Bidirectional I/O pins connected directly to upstream logic or controller bus segments. |
| B1–B10 | Port B data terminals | Bidirectional I/O pins routed to hot-pluggable modules; precharged to BIASV when disabled. |
| VCC | Positive supply | Powers internal switch FETs and bias circuitry; must be decoupled locally per layout guidelines. |
| GND | Ground reference | Common return path for all signals and supply currents; requires low-inductance connection. |
| BIASV | User-defined precharge voltage | External bias source (1.3–VCC) that sets B-port DC level during disable to minimize live-insertion glitches. |
Key Features
| Feature | Design Value |
|---|---|
| Precharged B-port outputs | Reduces live-insertion noise by clamping B1–B10 to user-defined BIASV instead of floating during hot-swap events. |
| 5 Ω low on-resistance | Minimizes voltage drop and timing skew across all 10 channels, enabling clean signal pass-through at >100 MHz. |
| TTL-compatible inputs | Accepts standard 0.8 V/2.0 V logic thresholds without level-shifting, simplifying integration with legacy 5-V controllers. |
| 10-bit single-enable architecture | Reduces control wiring complexity versus discrete switches; one ON\ line manages full 10-bit bus isolation. |
| –40°C to 85°C operation | Validated performance across industrial temperature range without derating, suitable for uncontrolled ambient environments. |
Applications
| Backplane Hot-Swap Modules | Memory Interleaving Systems |
|---|---|
|
Use Scenario: Inserting/removing daughter cards into a powered 5-V backplane without disrupting active bus traffic. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating A-port (backplane) from B-port (module), with BIASV precharge suppressing insertion transients. Use Value: Eliminates need for external transient suppressors and enables zero-downtime field upgrades in telecom and server chassis. |
Use Scenario: Routing address/data lines between dual memory banks controlled by an Intel 440BX chipset. IC Role / Device Role / Timing Role: High-speed 10-bit bus switch enabling dynamic memory bank selection with sub-nanosecond delay. Use Value: Maintains tight timing margins required for 100-MHz SDRAM interleaving while providing clean signal isolation. |
| Legacy-to-Modern Interface Translation | Modular Test Equipment Backplanes |
|
Use Scenario: Connecting 5-V TTL microcontrollers to 3.3-V FPGA peripherals in mixed-voltage test fixtures. IC Role / Device Role / Timing Role: Level-tolerant bus switch using BIASV = 3.3 V to precharge B-port, preventing undershoot on 3.3-V receivers. Use Value: Avoids dedicated level shifters and preserves signal integrity across voltage domains without added propagation delay. |
Use Scenario: Reconfigurable instrument modules plugged into a central controller backplane during calibration or maintenance. IC Role / Device Role / Timing Role: Isolation device ensuring module B-ports remain quiescent and non-interfering until fully seated and enabled. Use Value: Prevents bus contention and logic glitches during partial insertion, improving test repeatability and operator safety. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus-switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384DW | 12-bit, dual-supply (3.3 V/5 V), higher ron (7 Ω typ), no BIASV pin - uses internal 2.5-V precharge. | Designed for 3.3-V ↔ 5-V translation; lacks user-adjustable BIASV, limiting flexibility in custom voltage domains. | Select when cross-voltage translation is primary requirement and fixed 2.5-V precharge suffices. |
| SN74CBTS3384PWR | 12-bit, lower ron (3.5 Ω), higher drive strength, same DW package, but requires external pull-up for precharge control. | Optimized for high-speed memory interfaces; precharge relies on external resistor network rather than dedicated BIASV pin. | Select when lowest possible on-resistance and tighter timing budgets outweigh BIASV configurability. |
Compared with SN74CBT6800DWR, SN74CBTD3384DW offers built-in voltage translation but sacrifices BIASV adjustability, while SN74CBTS3384PWR delivers superior ron and speed at the cost of added external components for precharge management.
Availability
SN74CBT6800DWR is available at Aetrix Electronics and suitable for backplane hot-swap modules, memory interleaving systems, and legacy-to-modern interface translation requiring stable component supply and long-term industrial availability.
Supply support for SN74CBT6800DWR 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74CBT6800DWR belongs to TI's CBT (CrossBar Technology) bus-switch family, engineered specifically for high-speed, low-distortion signal routing in live-insertion and mixed-voltage system architectures.
FAQ
What is the function of the BIASV pin on the SN74CBT6800DWR?
The BIASV pin on the SN74CBT6800DWR provides a user-selectable voltage reference (1.3 V to VCC) to which the B-port outputs (B1–B10) are precharged when the device is disabled (ON\ high). This prevents floating nodes and reduces signal distortion during live insertion or removal of modules. The SN74CBT6800DWR uses an internal ~10-kΩ equivalent resistor to connect B-port terminals to BIASV, ensuring controlled biasing without external components.
Does the SN74CBT6800DWR support bidirectional signal flow?
Yes, the SN74CBT6800DWR supports true bidirectional signal flow between A-port and B-port terminals when enabled (ON\ low). Its FET-based switch architecture imposes no directionality - signals propagate equally well from A to B or B to A with identical on-state resistance (5–7 Ω) and propagation delay (≤0.25 ns). This makes the SN74CBT6800DWR ideal for shared-bus topologies where data direction changes dynamically.
What is the maximum operating voltage for VCC and BIASV on the SN74CBT6800DWR?
The absolute maximum rating for both VCC and BIASV on the SN74CBT6800DWR is 7 V, though recommended operating conditions specify VCC from 4.0 V to 5.5 V and BIASV from 1.3 V to VCC. Exceeding 5.5 V on VCC or applying BIASV above VCC may cause functional instability or accelerated wear, even if within absolute maximum limits. For reliable operation, the SN74CBT6800DWR must be used within its recommended ranges.
Can the SN74CBT6800DWR be used in 3.3-V systems?
The SN74CBT6800DWR is not rated for 3.3-V-only operation: its minimum recommended VCC is 4.0 V, and BIASV must be ≥1.3 V but ≤VCC. However, it can interface with 3.3-V logic when VCC = 5 V and BIASV is set to 3.3 V - leveraging its TTL-compatible inputs and precharge capability to safely drive 3.3-V receivers. In such configurations, the SN74CBT6800DWR acts as a robust 5-V–to–3.3-V bus buffer with live-insertion protection.
What package type does the SN74CBT6800DWR use, and what are its thermal characteristics?
The SN74CBT6800DWR uses a 24-pin Small-Outline (DW) package with 300-mil body width and gull-wing leads. Its thermal performance is characterized at a junction-to-ambient thermal resistance (θJA) of 81°C/W under standard JEDEC conditions. This value enables reliable operation at full load in typical industrial PCB layouts with modest copper area; derating is recommended above 70°C ambient unless enhanced heatsinking is applied. The DW package is pin-compatible with other CBT-family 24-pin variants like SN74CBT6800DBR and SN74CBT6800PWR.
SN74CBT6800DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
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- Circuit:
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- Independent Circuits:
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- Current - Output High, Low:
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- Voltage Supply Source:
- -
- Voltage - Supply:
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- Operating Temperature:
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SN74CBT6800DWR FAQ
1.How can I place an order for SN74CBT6800DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT6800DWR 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 SN74CBT6800DWR reliable?
The price and inventory of SN74CBT6800DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT6800DWR is usually 5 days.
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Once your SN74CBT6800DWR 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 SN74CBT6800DWR?
For technical support, including SN74CBT6800DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT6800DWR requirements.
6.How does Aetrix verify that SN74CBT6800DWR is sourced from the original manufacturer or authorized distributors?
All SN74CBT6800DWR 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 SN74CBT6800DWR meets industry standards.
7.What is the process for return or replacement of SN74CBT6800DWR?
All SN74CBT6800DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT6800DWR, 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 SN74CBT6800DWR part is unused and in its original packaging.
Return procedure for SN74CBT6800DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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