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Texas Instruments SN74CBT6800DBR
- Part No.:
- SN74CBT6800DBR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74CBT6800DBR.pdf
- Description:
- IC 10-BIT FET BUS SW 24-SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
SN74CBT6800DBR from Texas Instruments is a 10-bit TTL-compatible bus switch with precharged B-port outputs for live insertion, 5-Ω on-state resistance, bidirectional signal routing, and operation from –40°C to 85°C. It enables hot-plug-capable interconnects in backplane and modular system architectures.
For engineers reviewing the SN74CBT6800DBR datasheet, SN74CBT6800DBR pinout, SN74CBT6800DBR application, or SN74CBT6800DBR equivalent, key selection criteria include on-resistance (5–7 Ω), precharge bias voltage range (1.3 V to VCC), propagation delay (<0.25 ns), live-insertion noise suppression, and DB-package footprint compatibility with legacy small-outline layouts.
Technical Context
The SN74CBT6800DBR implements a single 10-bit bidirectional switch controlled by one active-low enable (ON) input. When enabled, it establishes low-distortion signal paths between A1–A10 and B1–B10 ports via sub-7-Ω MOSFET switches. Its precharge circuitry pulls B-port outputs to a user-supplied BIASV voltage through ~10-kΩ equivalent resistance when disabled.
This architecture eliminates floating-bus transients during hot-swap events and maintains TTL-compatible logic thresholds at both ports. The device operates across 4 V to 5.5 V VCC and supports BIASV from 1.3 V to VCC, enabling interoperability with mixed-voltage systems including 3.3-V and 5-V domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (rON) | 5–7 Ω typical; ensures minimal voltage drop and signal attenuation across bidirectional data paths. |
| Propagation delay (tpd) | <0.25 ns at 5 V; enables high-speed switching without timing budget impact in fast bus applications. |
| BIASV range | 1.3 V to VCC; allows precharge alignment with downstream logic thresholds in mixed-voltage systems. |
| Operating temperature | –40°C to 85°C; qualified for industrial-grade embedded and telecom infrastructure use. |
| Supply voltage (VCC) | 4 V to 5.5 V; compatible with standard 5-V TTL and 3.3-V tolerant I/O interfaces. |
| Off-state capacitance (CO(OFF)) | 4.5 pF; minimizes capacitive loading and crosstalk when switch is disabled. |
| Input leakage current | ±5 µA max; reduces static power draw and prevents unintended biasing in high-impedance states. |
Pinout & Package
SN74CBT6800DBR is housed in a 24-pin Plastic Shrink Small-Outline (DB) package, measuring 10.3 mm × 5.3 mm × 1.95 mm, with 0.65-mm lead pitch and surface-mount gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ON (Pin 1) | Active-low enable control | Drives internal switch array; low = A↔B connection, high = B-port precharge to BIASV. |
| A1–A10 (Pins 2–11) | Port A data inputs/outputs | Bidirectional TTL-compatible I/O; connects directly to upstream bus or controller. |
| GND (Pin 12) | Ground reference | Common return path for VCC, BIASV, and signal currents; must be low-inductance. |
| VCC (Pin 13) | Power supply | Supplies internal logic and switch driver circuitry; requires local 0.1-µF decoupling. |
| B1–B10 (Pins 14–23) | Port B data inputs/outputs | Bidirectional port with precharge capability; connects to hot-swappable module or backplane stub. |
| BIASV (Pin 24) | B-port precharge voltage source | User-supplied bias sets precharge level; must be stable and low-noise to suppress live-insertion glitches. |
Key Features
| Feature | Design Value |
|---|---|
| Precharged B-port outputs | Eliminates floating-bus noise during hot-swap by actively pulling B1–B10 to BIASV via ~10-kΩ equivalent resistance. |
| Low on-state resistance | 5–7 Ω ensures <10 mV voltage drop at 10 mA, preserving signal integrity across full logic swing. |
| TTL-compatible I/O levels | Supports direct interface with 5-V TTL and 3.3-V CMOS logic without level-shifting components. |
| Sub-nanosecond propagation delay | 0.25 ns typical enables use in >1-GHz data paths without added timing uncertainty. |
| Live-insertion optimized design | Combines precharge, low rON, and controlled edge rates to meet EIA-485 and hot-swap transient requirements. |
Applications
| Modular Backplane Interconnect | Hot-Swappable I/O Card Interface |
|---|---|
Use Scenario: Connecting a field-replaceable peripheral card to a fixed backplane while system remains powered. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating A-port (backplane side) from B-port (card side), with B-port precharged to prevent glitch injection during insertion. Use Value: Enables zero-downtime maintenance by suppressing live-insertion transients that would otherwise corrupt backplane data or reset controllers. | Use Scenario: Enabling safe insertion/removal of PCIe or CompactPCI I/O modules in telecom base stations. IC Role / Device Role / Timing Role: Signal isolation gate with precharge-controlled B-port termination, synchronized to card presence detection signals. Use Value: Prevents bus contention and ground bounce during mechanical mating, meeting IEC 61000-4-2 ESD and hot-swap compliance requirements. |
| Legacy-to-Modern Voltage Domain Bridge | High-Speed Test Fixture Signal Routing |
Use Scenario: Interfacing 5-V microcontroller peripherals with 3.3-V FPGA-based subsystems. IC Role / Device Role / Timing Role: Level-agnostic bidirectional switch where BIASV is set to 3.3 V to match downstream logic thresholds. Use Value: Avoids discrete level shifters while maintaining sub-ns timing accuracy and eliminating DC blocking capacitors. | Use Scenario: Reconfigurable signal path selection in automated test equipment for ASIC validation. IC Role / Device Role / Timing Role: Low-rON, low-CO switch enabling repeatable 10-bit parallel signal routing without skew or attenuation. Use Value: Delivers consistent 0.25-ns propagation delay across all 10 channels, critical for time-aligned stimulus/response measurement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD6800DBR | Includes power-down mode (IOFF protection); higher off-isolation (>50 dB); 6-V absolute max rating. | Required for systems needing IOFF protection during power sequencing or battery-backed standby. | Choose when bus isolation during power loss or partial shutdown is mandatory. |
| 74CBTLV6800PW | Lower VCC range (2.3–3.6 V); 3.3-V only; smaller PW package; no BIASV pin - uses internal 1.2-V precharge. | Suitable only for 3.3-V-only designs; lacks user-adjustable BIASV for mixed-voltage flexibility. | Choose for cost-sensitive, single-voltage 3.3-V systems where external BIASV control is unnecessary. |
Compared with SN74CBT6800DBR, SN74CBTD6800DBR adds IOFF protection for robust power sequencing, while 74CBTLV6800PW sacrifices BIASV adjustability and voltage range for lower voltage operation and reduced footprint - making SN74CBT6800DBR optimal for industrial hot-swap and mixed-voltage backplanes.
Availability
SN74CBT6800DBR is available at Aetrix Electronics and suitable for modular backplane interconnects, hot-swappable I/O card interfaces, and legacy-to-modern voltage domain bridges requiring stable component supply and long-term industrial availability.
Supply support for SN74CBT6800DBR 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 delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74CBT6800DBR belongs to TI's CBT (Crosspoint Bus Transceiver) family, designed specifically for high-speed, low-distortion bus switching in live-insertion and hot-swap applications.
FAQ
What is the function of the BIASV pin on the SN74CBT6800DBR?
The BIASV pin on the SN74CBT6800DBR supplies the user-selectable precharge voltage for the B-port outputs (B1–B10) when the device is disabled (ON = high). This voltage, ranging from 1.3 V to VCC, actively pulls B-port lines to a known state to eliminate floating-bus noise during live insertion. For reliable operation, BIASV must be stable and sourced from a low-impedance node; the SN74CBT6800DBR draws negligible current from this pin under steady-state conditions.
Does the SN74CBT6800DBR support bidirectional signal flow?
Yes, the SN74CBT6800DBR supports fully bidirectional signal flow between its A and B ports. When enabled (ON = low), the 10 internal MOSFET switches create low-resistance (5–7 Ω) paths that allow data to pass equally well from A1–A10 to B1–B10 or vice versa. No direction control pins or external biasing are required - signal direction is determined solely by the driving source on either side, making the SN74CBT6800DBR ideal for shared-bus topologies.
What is the maximum operating temperature range for the SN74CBT6800DBR?
The SN74CBT6800DBR is characterized for operation from –40°C to +85°C ambient temperature, meeting industrial-grade environmental requirements. This range is validated per TI's recommended operating conditions and applies across the full specified VCC (4 V to 5.5 V) and BIASV (1.3 V to VCC) ranges. The device's thermal performance in the DB package supports continuous operation at 85°C with appropriate PCB copper area and airflow, as confirmed in TI's Package Thermal Considerations documentation for the SN74CBT6800DBR.
Can the SN74CBT6800DBR be used in 3.3-V systems?
Yes, the SN74CBT6800DBR can be used in 3.3-V systems provided VCC is set to 3.3 V - but only if that voltage falls within the device's minimum VCC specification of 4 V. Since 3.3 V is below the 4-V minimum, the SN74CBT6800DBR is not rated for direct 3.3-V VCC operation. However, it supports interfacing with 3.3-V logic via its TTL-compatible inputs and BIASV-adjustable precharge - when powered from a compliant 4–5.5-V supply. For native 3.3-V operation, consider the 74CBTLV6800PW instead of the SN74CBT6800DBR.
How does the SN74CBT6800DBR minimize noise during live insertion?
The SN74CBT6800DBR minimizes live-insertion noise primarily through its B-port precharge architecture: when disabled (ON = high), the B1–B10 outputs are actively pulled to the user-supplied BIASV voltage via an internal ~10-kΩ equivalent resistor, preventing floating nodes and associated ESD-induced transients. Combined with low on-state resistance (5–7 Ω) and sub-0.25-ns propagation delay, this ensures clean signal transitions and eliminates bus contention during mechanical mating - a key requirement verified in telecom and industrial hot-swap standards. The SN74CBT6800DBR achieves this without external components or timing constraints.
SN74CBT6800DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- FET 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-SSOP
SN74CBT6800DBR FAQ
1.How can I place an order for SN74CBT6800DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT6800DBR 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 SN74CBT6800DBR reliable?
The price and inventory of SN74CBT6800DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT6800DBR is usually 5 days.
3.What payment methods are accepted for SN74CBT6800DBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT6800DBR transactions.
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4.How is shipping managed for SN74CBT6800DBR?
SN74CBT6800DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT6800DBR 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 SN74CBT6800DBR?
For technical support, including SN74CBT6800DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT6800DBR requirements.
6.How does Aetrix verify that SN74CBT6800DBR is sourced from the original manufacturer or authorized distributors?
All SN74CBT6800DBR 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 SN74CBT6800DBR meets industry standards.
7.What is the process for return or replacement of SN74CBT6800DBR?
All SN74CBT6800DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT6800DBR, 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 SN74CBT6800DBR part is unused and in its original packaging.
Return procedure for SN74CBT6800DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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