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Texas Instruments SN74CBT6800ADWR
- Part No.:
- SN74CBT6800ADWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBT6800ADWR.pdf
- Description:
- IC BUS SWITCH 10 X 1:1 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,574
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Product details
Overview
SN74CBT6800ADWR 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 interconnects and modular I/O subsystems.
For engineers reviewing the SN74CBT6800ADWR datasheet, SN74CBT6800ADWR pinout, SN74CBT6800ADWR application, or SN74CBT6800ADWR equivalent, key selection criteria include its 24-pin SOIC-DW package, 10-kΩ B-port precharge path to BIASV, TTL-level ON control input, and guaranteed operation from –40°C to 85°C with 4 V–5.5 V VCC.
Technical Context
The SN74CBT6800ADWR implements ten independent FET transmission gates controlled by a single active-low ON input. When enabled (ON = low), each A–B channel conducts bidirectionally with near-zero propagation delay and minimal RC loading due to low 5-Ω ron and 4.5-pF off-state capacitance.
When disabled (ON = high), the B port is actively pulled to BIASV via an internal 10-kΩ equivalent resistor, suppressing floating-node noise and enabling safe live insertion into powered backplanes. The device operates without DC blocking capacitors and supports mixed-voltage domain interfacing when BIASV is set independently of VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - Ensures compatibility with standard 5-V TTL and mixed 3.3/5-V system rails. |
| BIASV Range | 1.3 V to VCC - Allows biasing B port to intermediate voltage (e.g., 2.4 V) to reduce ground bounce during hot-plug events. |
| ron (Typical) | 5 Ω - Enables low-loss, high-fidelity signal pass-through with <10 mV drop at 20 mA per channel. |
| tpd (Typical) | 0.25 ns at 5 V - Supports >1 GHz data rates in short-reach parallel buses without timing skew penalties. |
| Co(OFF) | 4.5 pF - Minimizes capacitive loading on adjacent traces when switch is disabled, preserving signal integrity. |
| ICC (Max) | 50 µA - Enables low-quiescent-power operation in always-on system management functions. |
| Switch Configuration | 10-bit unidirectional enable, bidirectional data path - Single ON pin controls all ten channels simultaneously for synchronized bus isolation. |
Pinout & Package
SN74CBT6800ADWR is housed in a 24-pin SOIC (DW) package, 7.5 mm × 15.4 mm body, 1.27 mm pitch, with exposed metal-free construction and RoHS-compliant NiPdAu lead finish. Thermal resistance θJA = 46°C/W enables operation up to 85°C ambient without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ON (Pin 1) | Active-low enable input | Drives all ten switches; logic low connects A1–A10 to B1–B10; high disables and precharges B ports to BIASV. |
| A1–A10 (Pins 2–11) | Input/output port A | Bidirectional data terminal; electrically identical to B port; no internal direction control required. |
| GND (Pin 12) | Ground reference | Return path for VCC, BIASV, and signal currents; must be low-impedance for stable precharge behavior. |
| VCC (Pin 13) | Power supply | Supplies internal FET gate drive and logic; decoupling capacitor required within 1 cm for noise immunity. |
| B1–B10 (Pins 14–23) | Input/output port B | Bidirectional data terminal; internally precharged to BIASV when ON is high; matches A-port electrical specs. |
| BIASV (Pin 24) | Bias voltage input | User-supplied reference (1.3 V to VCC) that sets precharge level for B port during disable; must be stable and low-noise. |
Key Features
| Feature | Design Value |
|---|---|
| Precharged B-port outputs | Internal 10-kΩ pull-up to BIASV eliminates floating nodes during hot-swap, reducing EMI and contact arcing risk. |
| Low on-state resistance | 5 Ω typical ensures <10 mV voltage drop at 20 mA, preserving TTL logic margins across full temperature range. |
| TTL-compatible control input | VIH = 2 V / VIL = 0.8 V allows direct interface with legacy 5-V microcontrollers and CPLDs without level shifters. |
| Zero-power disable state | ICC ≤ 50 µA at VCC = 5.5 V and all inputs at rail enables use in battery-backed or always-on monitoring circuits. |
| Hot-swap optimized architecture | No internal latches or clocks; purely analog FET switching avoids metastability and enables true plug-and-play operation. |
Applications
| Modular Backplane Interconnect | Hot-Swappable I/O Card Interface |
|---|---|
|
Use Scenario: Inserting/removing I/O cards into a powered telecom shelf while maintaining uninterrupted data flow on shared backplane lines. IC Role / Device Role / Timing Role: Bus switch isolating card-side signals from backplane during insertion; precharged B port prevents glitches on shared data lines. Use Value: Eliminates need for complex sequencing circuitry or mechanical interlocks-enables true hot-swap compliance per IEEE 1101.10. |
Use Scenario: Adding sensor acquisition modules to an industrial PLC rack without powering down the main controller or fieldbus network. IC Role / Device Role / Timing Role: Bidirectional signal bridge between module-local bus and PLC backplane; ON pin tied to card-present detection signal. Use Value: Prevents bus contention and ground bounce during insertion, avoiding spurious Modbus CRC errors or CAN bus arbitration failures. |
| Legacy System Voltage Translation | Test Equipment Signal Routing |
|
Use Scenario: Interfacing 3.3-V FPGA I/O banks to 5-V legacy peripherals (e.g., ISA-bus devices) without level-shifter ICs. IC Role / Device Role / Timing Role: Passive bidirectional switch; BIASV set to 3.3 V to clamp B port, allowing safe 5-V tolerant A-side operation. Use Value: Avoids propagation delay stacking and timing skew introduced by discrete level translators-preserves setup/hold margins. |
Use Scenario: Reconfigurable signal path selection in automated test equipment (ATE) where DUT signals must be routed to multiple measurement instruments. IC Role / Device Role / Timing Role: Low-capacitance, low-ron multiplexer enabling sub-nanosecond edge fidelity across 10 parallel test channels. Use Value: Maintains signal integrity for high-speed digital pattern generation (e.g., DDR2/3 eye diagrams) without added jitter or rise-time degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD6800ADWR | Includes power-down control (OE pin) and higher 128-mA channel current rating; otherwise identical pinout and function. | Required when system demands explicit power-gating or drives heavier capacitive loads (>100 pF). | Select SN74CBTD6800ADWR if OE-controlled shutdown or higher current drive is needed; otherwise SN74CBT6800ADWR suffices. |
| 74LVC1G66GW,125 | Single-channel, 5-pin SC-70 package; 6 Ω ron, 3.3-V only; no BIASV or precharge capability. | Suitable only for point-to-point, non-hot-swap, low-density signal gating-not scalable to 10-bit bus isolation. | Use 74LVC1G66GW,125 only for isolated single-signal gating; not a functional substitute for 10-bit live-insertion requirements. |
Compared with SN74CBT6800ADWR, SN74CBTD6800ADWR adds power-down control but shares identical precharge architecture and timing, while 74LVC1G66GW,125 lacks multi-bit coordination, BIASV support, and hot-swap optimization-making it unsuitable for bus-level live insertion.
Availability
SN74CBT6800ADWR is available at Aetrix Electronics and suitable for modular backplane interconnects, hot-swappable I/O card interfaces, and legacy voltage translation requiring stable component supply and long-term lifecycle support.
Supply support for SN74CBT6800ADWR 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 SN74CBT6800ADWR belongs to TI's CBT (CrossBar Transistor) family of high-speed bus switches, engineered specifically for zero-delay, low-distortion signal routing in hot-pluggable systems and mixed-voltage board-level interconnects.
FAQ
What is the maximum operating temperature range for the SN74CBT6800ADWR?
The SN74CBT6800ADWR is rated for continuous operation from –40°C to +85°C ambient temperature. This range is validated per TI's recommended operating conditions and supported by thermal characterization showing θJA = 46°C/W in the SOIC-DW package. Operation outside this range may degrade ron stability and precharge accuracy.
Can the SN74CBT6800ADWR be used with a 3.3-V VCC supply?
No-the SN74CBT6800ADWR requires VCC between 4 V and 5.5 V per its recommended operating conditions. Using 3.3 V violates the minimum VCC specification and risks unreliable switching, elevated ron, and failure to meet TTL input thresholds. For 3.3-V systems, consider TI's SN74CB3Q16245 or similar 3.3-V–optimized switches.
How does the BIASV pin function when the SN74CBT6800ADWR is enabled (ON = low)?
When ON is low and the SN74CBT6800ADWR is enabled, the BIASV pin has no active role-the B port is directly connected to the A port via low-resistance FETs. BIASV only affects the B port during disable (ON = high), when it establishes the precharge voltage level through the internal 10-kΩ equivalent resistor.
Is the SN74CBT6800ADWR pin-compatible with other packages in the same family?
Yes-SN74CBT6800ADWR (SOIC-DW), SN74CBT6800ADBR (SSOP-DB), and SN74CBT6800APWR (TSSOP-PW) share identical pinout and logic functionality. Mechanical differences (body size, pitch, thermal performance) exist, but PCB layout changes are required only for footprint adaptation-not signal routing or schematic revision.
Does the SN74CBT6800ADWR require external pull-up resistors on the ON pin?
No-TI's datasheet specifies that unused control inputs must be held at VCC or GND, and the ON pin is internally compatible with TTL logic levels (VIH = 2 V, VIL = 0.8 V). A direct connection to a microcontroller GPIO or system enable signal is sufficient; no external pull-up is needed unless open-drain driving is used.
SN74CBT6800ADWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Cut Tape (CT)
- 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
SN74CBT6800ADWR FAQ
1.How can I place an order for SN74CBT6800ADWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT6800ADWR 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 SN74CBT6800ADWR reliable?
The price and inventory of SN74CBT6800ADWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT6800ADWR is usually 5 days.
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Once your SN74CBT6800ADWR 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 SN74CBT6800ADWR?
For technical support, including SN74CBT6800ADWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT6800ADWR requirements.
6.How does Aetrix verify that SN74CBT6800ADWR is sourced from the original manufacturer or authorized distributors?
All SN74CBT6800ADWR 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 SN74CBT6800ADWR meets industry standards.
7.What is the process for return or replacement of SN74CBT6800ADWR?
All SN74CBT6800ADWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT6800ADWR, 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 SN74CBT6800ADWR part is unused and in its original packaging.
Return procedure for SN74CBT6800ADWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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