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Home > Products > Integrated Circuits (ICs) > Logic > Signal Switches, Multiplexers, Decoders

Texas Instruments SN74CBTS6800DBQR

Name: SN74CBTS6800DBQR
Brand: Texas Instruments
SKU: SN74CBTS6800DBQR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74CBTS6800DBQR

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 24-SSOP (0.154", 3.90mm Width)

Datasheet:: SN74CBTS6800DBQR.pdf

Description:: IC BUS SW 10 X 1:1 24SSOP/QSOP

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Product details

Overview

SN74CBTS6800DBQR from Texas Instruments is a 10-bit FET bus switch with precharged outputs and Schottky diode clamping, designed for live-insertion applications in backplane and hot-swap systems. It features 5-Ω on-state resistance, TTL-compatible inputs, bidirectional signal routing between A and B ports, and B-port precharge to user-selectable BIASV (1.3 V to VCC) to suppress noise during hot-plug events.

For engineers reviewing the SN74CBTS6800DBQR datasheet, SN74CBTS6800DBQR pinout, SN74CBTS6800DBQR application, or SN74CBTS6800DBQR equivalent, key selection considerations include its 24-pin SSOP (DBQ) package, 0.25 ns typical propagation delay, –2 V undershoot clamping via integrated Schottky diodes, and bias-controlled precharge functionality critical for system-level hot-swap robustness.

Technical Context

The SN74CBTS6800DBQR implements a single-enable, 10-bit analog switch architecture using low-R_ON FETs to achieve near-zero propagation delay and bidirectional signal integrity. Its control logic uses active-low ON input: when low, A1–A10 connect directly to B1–B10; when high, B ports are precharged to BIASV through an internal ~10-kΩ path.

Each I/O includes integrated Schottky clamping diodes limiting undershoot to –2 V, and all pins support –0.5 V to 7 V absolute maximum voltage ranges. The device operates across –40°C to 85°C with VCC = 4 V to 5.5 V and BIASV = 1.3 V to VCC, enabling compatibility with mixed-voltage backplane environments.

Key Specifications

Parameter	Value and Actual Design Meaning
On-state resistance (r_ON)	3 Ω to 7 Ω at VCC = 4.5 V - ensures minimal insertion loss and signal attenuation in high-speed data paths.
Propagation delay (t_pd)	0.25 ns typical at VCC = 5 V - enables sub-nanosecond timing alignment for DDR, PCI, and parallel bus applications.
Bias voltage range (BIASV)	1.3 V to VCC - allows flexible precharge level selection to match system reference voltages and reduce ground bounce.
Undershoot clamping	–2 V via integrated Schottky diodes - protects downstream receivers during hot-insertion transients without external components.
Supply current (I_CC)	3 µA max at VCC = 5.5 V - supports ultra-low static power in always-on hot-swap controller subsystems.
Input capacitance (C_i)	3.5 pF - minimizes loading on driving logic and preserves signal edge rates in dense PCB layouts.
Off-state I/O capacitance (C_io(OFF))	4.5 pF - reduces crosstalk and maintains isolation between enabled and disabled channels in multi-drop buses.

Pinout & Package

SN74CBTS6800DBQR is housed in a 24-pin SSOP (Shrink Small Outline Package), also designated DBQ, with 0.65 mm pitch and 1.2 mm maximum height. Pin 1 is located in quadrant Q1 per JEDEC MO-153, and the package is RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.

Pin/Terminal	Circuit Role	Design Meaning
ON	Active-low enable input	Drives switch conduction state: low = A↔B connected; high = B port precharged to BIASV.
A1–A10	Port A data terminals	Bidirectional signal inputs/outputs; electrically identical to B1–B10 when switch is enabled.
B1–B10	Port B data terminals	Bidirectional signal interface; internally precharged to BIASV when ON is high or VCC = 0 V.
VCC	Power supply	4 V to 5.5 V operation; powers internal FETs and clamp diodes; must be stable before asserting ON.
GND	Ground reference	Common return for all signals and internal bias networks; requires low-inductance connection for noise control.
BIASV	Bias voltage input	User-supplied reference (1.3 V to VCC) setting precharge level for B-port during disable or power-down.

Key Features

Feature	Design Value
Precharged B-port outputs	Reduces live-insertion noise by holding B1–B10 at stable BIASV instead of floating, eliminating bus contention during hot-plug transitions.
Integrated Schottky clamping	Clamps I/O undershoot to –2 V without external diodes, preventing latch-up and protecting 3.3 V/5 V receivers in mixed-voltage backplanes.
Low 5-Ω r_ON	Minimizes voltage drop and timing skew across all 10 channels, supporting clean signal transmission up to 100+ MHz parallel bus speeds.
TTL-compatible control inputs	Accepts VIH ≥ 2 V and VIL ≤ 0.8 V, enabling direct interfacing with legacy 5 V logic without level-shifting circuitry.
Bidirectional signal routing	Eliminates direction-control pins and supports symmetric data flow between A and B ports-ideal for memory-mapped I/O and shared-bus architectures.

Applications

Hot-Swap Backplane Interface	PCI/PCI-X Bus Isolation
Use Scenario: Inserting or removing line cards in telecom or server chassis while main power remains active. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating card-side signals from backplane during insertion; precharges B-port to suppress ground bounce. Use Value: Prevents bus glitches and system resets by eliminating floating nodes and undershoot spikes during mechanical mating.	Use Scenario: Adding/removing expansion cards in industrial PCs or embedded controllers with legacy PCI slots. IC Role / Device Role / Timing Role: Enables/disables 32-bit parallel data paths between host bridge and peripheral; provides sub-ns timing alignment. Use Value: Maintains signal integrity across full 33 MHz PCI clock domain with <7 Ω r_ON and <0.3 ns t_pd.
Memory Module Presence Detection	Configurable I/O Multiplexing
Use Scenario: Detecting presence and initializing DDR SDRAM modules in modular compute blades. IC Role / Device Role / Timing Role: Routes SPD EEPROM address/data lines only when module is fully seated; precharges B-port to avoid false reads. Use Value: Ensures reliable SPD communication by eliminating floating bus states during partial insertion.	Use Scenario: Sharing GPIO or debug interfaces among multiple peripherals in space-constrained IoT gateways. IC Role / Device Role / Timing Role: Selectively connects microcontroller pins to alternate functions (e.g., UART ↔ SPI) using single ON control. Use Value: Reduces MCU pin count requirements while maintaining signal fidelity via low-r_ON, low-C_i switching.

Hot-Swap Backplane Interface

PCI/PCI-X Bus Isolation

Use Scenario: Inserting or removing line cards in telecom or server chassis while main power remains active.

IC Role / Device Role / Timing Role: Bidirectional bus switch isolating card-side signals from backplane during insertion; precharges B-port to suppress ground bounce.

Use Value: Prevents bus glitches and system resets by eliminating floating nodes and undershoot spikes during mechanical mating.

Use Scenario: Adding/removing expansion cards in industrial PCs or embedded controllers with legacy PCI slots.

IC Role / Device Role / Timing Role: Enables/disables 32-bit parallel data paths between host bridge and peripheral; provides sub-ns timing alignment.

Use Value: Maintains signal integrity across full 33 MHz PCI clock domain with <7 Ω r_ON and <0.3 ns t_pd.

Memory Module Presence Detection

Configurable I/O Multiplexing

Use Scenario: Detecting presence and initializing DDR SDRAM modules in modular compute blades.

IC Role / Device Role / Timing Role: Routes SPD EEPROM address/data lines only when module is fully seated; precharges B-port to avoid false reads.

Use Value: Ensures reliable SPD communication by eliminating floating bus states during partial insertion.

Use Scenario: Sharing GPIO or debug interfaces among multiple peripherals in space-constrained IoT gateways.

IC Role / Device Role / Timing Role: Selectively connects microcontroller pins to alternate functions (e.g., UART ↔ SPI) using single ON control.

Use Value: Reduces MCU pin count requirements while maintaining signal fidelity via low-r_ON, low-C_i switching.

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus switch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBT16210DLR	20-bit, two independent 10-bit sections; no BIASV pin; relies on external pull-ups for precharge.	Lacks integrated bias control; requires external resistors and layout changes to replicate live-insertion noise suppression.	Choose when higher channel count is needed and board space allows discrete precharge design.
SN74CBTLV3245PWR	8-bit, lower VCC range (2.3 V–3.6 V); no Schottky clamping; r_ON = 4 Ω typical.	Not rated for –2 V undershoot; unsuitable for 5 V hot-swap systems; optimized for low-voltage mobile I/O.	Choose only for 3.3 V-only systems where clamping and bias control are not required.

Compared with SN74CBTS6800DBQR, SN74CBT16210DLR offers double the channel density but sacrifices integrated precharge and clamping, increasing BOM count and layout complexity; SN74CBTLV3245PWR reduces power and size but eliminates critical hot-swap protections, limiting use to non-live-insertion applications.

Availability

SN74CBTS6800DBQR is available at Aetrix Electronics and suitable for hot-swap backplane interfaces, PCI bus isolation, memory module presence detection, and configurable I/O multiplexing requiring stable component supply across extended temperature and mixed-voltage environments.

Supply support for SN74CBTS6800DBQR 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 SN74CBTS6800DBQR belongs to TI's CBTS-series bus switches, engineered specifically for high-reliability hot-swap and live-insertion systems where signal integrity, undershoot protection, and controlled precharge behavior are mandatory.

FAQ

What is the maximum undershoot voltage the SN74CBTS6800DBQR can safely clamp?

The SN74CBTS6800DBQR integrates Schottky diodes that clamp I/O undershoot to –2 V, protecting connected receivers from negative transients during hot-plug events. This clamping level is specified under absolute maximum ratings and applies across all A and B pins when VCC is powered. Exceeding –2 V risks damage, so system-level transient suppression must ensure inputs remain within this limit. The SN74CBTS6800DBQR does not provide overshoot clamping.

How does the BIASV pin function in the SN74CBTS6800DBQR during hot-insertion sequences?

In the SN74CBTS6800DBQR, the BIASV pin sets the precharge voltage applied to B1–B10 when the ON input is high or VCC is 0 V. During hot-insertion, this holds the B-port at a known DC level (1.3 V to VCC), preventing floating nodes and reducing ground bounce-induced noise. The internal equivalent 10-kΩ resistor connects B-port to BIASV, ensuring fast settling without external components. This behavior is unique to the SN74CBTS6800DBQR among TI's bus switches.

Is the SN74CBTS6800DBQR pin-compatible with other packages in the SN74CBTS6800 family?

No - the SN74CBTS6800DBQR uses a 24-pin SSOP (DBQ) package with 0.65 mm pitch, while other variants like SN74CBTS6800DWR (SOIC-DW) and SN74CBTS6800PWR (TSSOP-PW) have different footprints, thermal characteristics, and land patterns. Although all share identical pin functions and logic, mechanical compatibility requires separate PCB layouts. The SN74CBTS6800DBQR is not a drop-in replacement for DW or PW versions due to package dimension and solder mask differences.

What is the typical on-state resistance (r_ON) of the SN74CBTS6800DBQR and how does it affect signal integrity?

The SN74CBTS6800DBQR has a typical on-state resistance of 5 Ω, with a guaranteed range of 3 Ω to 7 Ω at VCC = 4.5 V. This low r_ON minimizes voltage drop and RC time constant effects, preserving rise/fall times and reducing timing skew across all 10 channels. In practice, it enables clean transmission of 100+ MHz parallel signals with <0.3 ns added propagation delay - a key factor in maintaining setup/hold margins in PCI and backplane applications using the SN74CBTS6800DBQR.

Does the SN74CBTS6800DBQR support bidirectional signal flow, and are there any directional limitations?

Yes - the SN74CBTS6800DBQR supports fully bidirectional signal flow between A1–A10 and B1–B10 when ON is low. There are no inherent direction limitations: signals propagate equally well from A-to-B or B-to-A with identical r_ON, capacitance, and delay. This symmetry eliminates need for direction-control logic and simplifies routing in shared-bus topologies. The SN74CBTS6800DBQR achieves this via complementary FET pairs per channel, unlike unidirectional translators or level shifters.

SN74CBTS6800DBQR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74CBTS

Package/Case:: 24-SSOP (0.154", 3.90mm Width)

Packaging:: Bulk

Product Status:: Discontinued at Digi-Key

Type:: Bus Switch

Circuit:: 10 x 1:1

Independent Circuits:: 1

Current - Output High, Low:: -

Voltage Supply Source:: Single Supply

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 24-SSOP

SN74CBTS6800DBQR FAQ

1.How can I place an order for SN74CBTS6800DBQR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74CBTS6800DBQR 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 SN74CBTS6800DBQR reliable?

The price and inventory of SN74CBTS6800DBQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTS6800DBQR is usually 5 days.

3.What payment methods are accepted for SN74CBTS6800DBQR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBTS6800DBQR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74CBTS6800DBQR?

SN74CBTS6800DBQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74CBTS6800DBQR 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 SN74CBTS6800DBQR?

For technical support, including SN74CBTS6800DBQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTS6800DBQR requirements.

6.How does Aetrix verify that SN74CBTS6800DBQR is sourced from the original manufacturer or authorized distributors?

All SN74CBTS6800DBQR 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 SN74CBTS6800DBQR meets industry standards.

7.What is the process for return or replacement of SN74CBTS6800DBQR?

All SN74CBTS6800DBQR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTS6800DBQR, 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 SN74CBTS6800DBQR part is unused and in its original packaging.

Return procedure for SN74CBTS6800DBQR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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