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Texas Instruments SN74CBT6800ADW
- Part No.:
- SN74CBT6800ADW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBT6800ADW.pdf
- Description:
- IC BUS SWITCH 10 X 1:1 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,678
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Product details
Overview
SN74CBT6800ADW from Texas Instruments is a 10-bit FET bus switch with precharged B-port outputs, designed for high-speed TTL-compatible bidirectional data routing in hot-swap and live-insertion systems. It features 5-Ω on-state resistance, 0.25 ns typical propagation delay at 5 V, and user-selectable BIASV bias voltage (1.3 V to VCC) to suppress signal distortion during insertion. Used in backplane interface modules and modular I/O subsystems requiring zero-delay switching.
For engineers reviewing the SN74CBT6800ADW datasheet, SN74CBT6800ADW pinout, SN74CBT6800ADW application, or SN74CBT6800ADW equivalent, key selection criteria include on-resistance matching, BIASV configurability, SOIC-DW thermal performance (θJA = 46°C/W), and live-insertion noise suppression capability in 24-pin bus isolation designs.
Technical Context
The SN74CBT6800ADW implements ten independent NMOS pass-gate switches controlled by a single active-low ON input. When enabled (ON = low), A1–A10 connect directly to B1–B10 with near-zero RC delay; when disabled (ON = high), all A ports float while B ports are pulled to BIASV via internal ~10-kΩ resistive networks.
Its architecture supports bidirectional signal flow without direction control pins, and the precharge function operates independently of VCC status - B port remains biased to BIASV even when VCC = 0 V, enabling true hot-swap readiness. Input thresholds (VIH = 2 V, VIL = 0.8 V) ensure compatibility with TTL and 5-V CMOS logic families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 3 Ω to 7 Ω (typ. 5 Ω) - enables minimal voltage drop and signal integrity across 10-bit data paths at ≤64 mA per switch. |
| Propagation delay (tpd) | 0.25 ns at VCC = 5 V - supports >1 GHz data rates in high-speed parallel bus applications. |
| BIASV range | 1.3 V to VCC - allows precise noise threshold setting for live-insertion in mixed-voltage systems. |
| Supply voltage (VCC) | 4 V to 5.5 V - ensures robust operation across industrial 5-V rails with margin for ripple and droop. |
| Input leakage (II) | ±5 µA max - prevents unintended switching or loading in high-impedance control environments. |
| Off-state capacitance (Co(OFF)) | 4.5 pF - minimizes crosstalk and capacitive coupling between adjacent channels in dense PCB layouts. |
Pinout & Package
SN74CBT6800ADW is housed in a 24-pin SOIC (DW) package measuring 15.4 mm × 7.5 mm × 2.35 mm, with standard 1.27-mm pitch and gull-wing leads. Thermal resistance θJA = 46°C/W enables reliable operation up to 85°C ambient without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ON (Pin 1) | Active-low enable input | Drives all 10 switches simultaneously; low = A↔B path enabled, high = A open, B precharged to BIASV. |
| A1–A10 (Pins 2–11) | Port A data inputs/outputs | Bidirectional TTL-compatible terminals; no internal pull-ups/downs; require external termination if floating. |
| GND (Pin 12) | Ground reference | Primary return path for switch current and bias network; must be low-inductance connection for noise control. |
| VCC (Pin 13) | Power supply | Supplies switch driver circuitry; decoupling capacitor (0.1 µF) required within 5 mm of pin for stable switching. |
| B1–B10 (Pins 14–23) | Port B data inputs/outputs | Bidirectional terminals precharged to BIASV when ON = high; tolerate VCC = 0 V while maintaining bias state. |
| BIASV (Pin 24) | Bias voltage input | User-supplied reference (1.3 V to VCC) that sets precharge level for B-port noise suppression during hot-swap events. |
Key Features
| Feature | Design Value |
|---|---|
| Precharged B-port outputs | Internal 10-kΩ pull-up to BIASV eliminates floating states and reduces live-insertion transients by clamping B-port voltage before connection. |
| Low on-resistance (5 Ω typ.) | Minimizes IR drop and timing skew across all 10 channels, preserving signal edge fidelity in parallel bus architectures. |
| TTL-compatible control inputs | VIH = 2 V / VIL = 0.8 V thresholds allow direct interfacing with legacy 5-V microcontrollers and FPGA I/O banks without level shifters. |
| Zero-power B-port biasing | B port remains biased to BIASV even when VCC = 0 V - critical for hot-swap safety in modular backplanes and field-replaceable units. |
| 24-pin SOIC (DW) footprint | Industry-standard package enables drop-in replacement in existing 5-V bus isolation designs and simplifies PCB layout reuse. |
Applications
| Modular Backplane Interface | Hot-Swappable I/O Card |
|---|---|
Use Scenario: Isolating control/data lines between a main chassis backplane and plug-in peripheral cards during live insertion/removal. IC Role / Device Role / Timing Role: Bidirectional bus switch providing galvanic isolation and B-port precharge to suppress insertion glitches on shared address/data buses. Use Value: Eliminates need for external bias resistors and discrete MOSFET arrays, reducing component count and board space while meeting IEC 61000-4-2 ESD immunity requirements. |
Use Scenario: Enabling safe insertion of expansion cards into powered industrial PLC racks without disrupting CPU or memory operations. IC Role / Device Role / Timing Role: 10-bit channel isolator with BIASV-controlled precharge that holds B-port at known voltage prior to mechanical contact. Use Value: Prevents bus contention and latch-up during partial connector engagement, supporting Class A hot-swap compliance per IEEE 1394 and PCI Express specifications. |
| Legacy System Bus Extension | Test Equipment Signal Routing |
Use Scenario: Extending TTL-level parallel bus segments (e.g., ISA, GPIB) across daughterboard interfaces where timing-critical signals must retain integrity. IC Role / Device Role / Timing Role: Low-latency, bidirectional pass-gate array with sub-nanosecond tpd ensuring setup/hold timing margins remain intact across extended traces. Use Value: Maintains signal rise/fall times <1 ns and inter-channel skew <0.1 ns - critical for synchronous 20+ MHz parallel transfers in automated test systems. |
Use Scenario: Reconfigurable signal path selection in modular benchtop instruments (e.g., oscilloscope front-end multiplexing or DMM range switching). IC Role / Device Role / Timing Role: Precision analog/digital bus switch enabling software-controlled routing of calibration references, sensor inputs, or DAC outputs. Use Value: On-resistance flatness (<2 Ω variation across channels) and low Co(OFF) ensure channel-to-channel crosstalk <−60 dB at 100 MHz, preserving measurement accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD6800ADW | Includes power-down mode (Ioff protection) and higher drive strength; ron = 3.5 Ω typ.; supports 3.3-V and 5-V mixed-mode operation. | Required where system-level power sequencing mandates Ioff isolation during VCC ramp-up/down or partial power loss. | Select SN74CBTD6800ADW when Ioff specification (≤1 µA at VCC = 0 V) is mandatory for fault-tolerant power architectures. |
| 74LVC1G3157DCKR | Single-pole double-throw (SPDT) analog switch; 5-V tolerant; ron = 6 Ω; no BIASV or precharge functionality; 5-pin SC70 package. | Suitable only for point-to-point signal routing, not 10-bit parallel bus isolation; lacks live-insertion support. | Choose 74LVC1G3157DCKR for low-pin-count, low-cost analog/digital multiplexing where precharge and multi-bit coordination are unnecessary. |
Compared with SN74CBT6800ADW, SN74CBTD6800ADW adds Ioff protection for robust power sequencing but increases cost and complexity, while 74LVC1G3157DCKR offers compact size and voltage tolerance at the expense of scalability and hot-swap capability - making SN74CBT6800ADW optimal for fixed 10-bit bus isolation with live-insertion requirements.
Availability
SN74CBT6800ADW is available at Aetrix Electronics and suitable for modular backplane interfaces, hot-swappable I/O card designs, and legacy TTL bus extension systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for SN74CBT6800ADW 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 markets.
The SN74CBT6800ADW belongs to TI's CBT (Crosspoint Bus Transceiver) family, engineered specifically for high-speed, low-distortion bus switching in live-insertion and hot-swap applications where signal integrity and deterministic precharge behavior are critical.
FAQ
What is the maximum continuous current rating per channel for the SN74CBT6800ADW?
The SN74CBT6800ADW supports a continuous channel current of 128 mA per switch, verified under absolute maximum ratings. This rating applies to steady-state DC conduction through the on-state FET channel. For reliable long-term operation, TI recommends limiting sustained current to ≤64 mA per channel to maintain junction temperature within safe limits under typical SOIC-DW thermal conditions.
Does the SN74CBT6800ADW require external pull-up resistors on the B port?
No - the SN74CBT6800ADW integrates internal ~10-kΩ resistive networks that automatically precharge the B1–B10 pins to the BIASV voltage when ON is high or VCC = 0 V. External pull-ups are unnecessary and would conflict with this built-in biasing, potentially causing excessive current draw or incorrect voltage levels.
Can the SN74CBT6800ADW operate with BIASV set to 0 V (GND)?
Yes - the SN74CBT6800ADW permits BIASV = 0 V (GND), as confirmed by the absolute maximum rating (–0.5 V to 7 V) and functional description. At BIASV = GND, the B port is actively pulled low during disable, which is valid for applications requiring active-low default states during hot-swap transitions.
What is the thermal resistance (θJA) of the SN74CBT6800ADW in its SOIC-DW package?
The SN74CBT6800ADW in the SOIC-DW package has a specified junction-to-ambient thermal resistance (θJA) of 46°C/W under standard JEDEC test conditions. This value assumes a two-layer PCB with 1 in² copper pour per side and is critical for calculating maximum allowable power dissipation in thermally constrained industrial enclosures.
Is the SN74CBT6800ADW compatible with 3.3-V logic control signals?
No - the SN74CBT6800ADW requires TTL-compatible input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) and operates from VCC = 4 V to 5.5 V. While 3.3-V signals may exceed VIL, they fall below the minimum VIH of 2 V under worst-case conditions (e.g., 3.3 V × 0.7 = 2.31 V nominal, but derated for noise margin), so a level shifter or buffer is required for reliable 3.3-V control interface.
SN74CBT6800ADW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
SN74CBT6800ADW FAQ
1.How can I place an order for SN74CBT6800ADW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT6800ADW 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 SN74CBT6800ADW reliable?
The price and inventory of SN74CBT6800ADW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT6800ADW is usually 5 days.
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Once your SN74CBT6800ADW 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 SN74CBT6800ADW?
For technical support, including SN74CBT6800ADW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT6800ADW requirements.
6.How does Aetrix verify that SN74CBT6800ADW is sourced from the original manufacturer or authorized distributors?
All SN74CBT6800ADW 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 SN74CBT6800ADW meets industry standards.
7.What is the process for return or replacement of SN74CBT6800ADW?
All SN74CBT6800ADW units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT6800ADW, 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 SN74CBT6800ADW part is unused and in its original packaging.
Return procedure for SN74CBT6800ADW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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