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Texas Instruments SN74CBT6800ADBR
- Part No.:
- SN74CBT6800ADBR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74CBT6800ADBR.pdf
- Description:
- IC BUS SWITCH 10 X 1:1 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
SN74CBT6800ADBR from Texas Instruments is a 10-bit FET bus switch with precharged B-port outputs, designed for live-insertion applications in backplane and hot-swap systems. It features 5-Ω on-state resistance, TTL-compatible control inputs, and user-selectable BIASV bias voltage (1.3 V to VCC) to minimize signal distortion during hot-plug events. The device operates from –40°C to 85°C in a 24-pin SSOP package.
For engineers reviewing the SN74CBT6800ADBR datasheet, SN74CBT6800ADBR pinout, SN74CBT6800ADBR application, or SN74CBT6800ADBR equivalent, key selection criteria include on-resistance stability across VCC (4–5.5 V), precharge-enabled noise suppression during live insertion, bidirectional signal integrity at <0.35 ns propagation delay, and compatibility with 3.3-V/5-V mixed-voltage bus architectures.
Technical Context
The SN74CBT6800ADBR implements a single 10-bit FET-based analog switch array with one global enable (ON) input controlling all channels simultaneously. Its low on-resistance (3–7 Ω typical) and near-zero propagation delay (<0.35 ns at 4 V VCC) support high-fidelity bidirectional data transfer without direction control logic.
When enabled (ON = low), A1–A10 are electrically connected to B1–B10 via low-RON FETs. When disabled (ON = high or VCC = 0 V), the B port is actively precharged to BIASV through an internal ~10-kΩ equivalent resistor, suppressing floating-node transients critical in hot-swap card-edge interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (RON) | 3–7 Ω typical - ensures minimal voltage drop and signal attenuation across 10-bit data paths at 30–64 mA channel current. |
| Propagation delay (tpd) | 0.25–0.35 ns - enables sub-nanosecond timing alignment for high-speed parallel buses up to 1 GHz effective bandwidth. |
| BIASV range | 1.3 V to VCC - allows precise precharge voltage tuning to match system I/O thresholds (e.g., 2.4 V for 3.3-V LVTTL). |
| VCC operating range | 4 V to 5.5 V - supports robust operation across industrial-grade 5-V supply tolerances and brownout margins. |
| Input capacitance (Ci) | 3.5 pF - limits loading on upstream drivers and preserves edge rate integrity in dense PCB routing. |
| Off-state output capacitance (CO(OFF)) | 4.5 pF - minimizes crosstalk and capacitive coupling between adjacent channels when switched off. |
| Operating temperature | –40°C to +85°C - qualified for extended-temperature industrial and telecom infrastructure environments. |
Pinout & Package
SN74CBT6800ADBR is housed in a 24-pin SSOP (Shrink Small Outline Package) with 0.65-mm lead pitch, 7.9 mm × 4.5 mm body size, and 1.2 mm max height - optimized for space-constrained backplane interface modules and modular I/O cards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ON (Pin 1) | Global enable input | Active-low control: drives all 10 switches ON when low; disables all and precharges B port when high. |
| A1–A10 (Pins 2–11) | Port A data inputs/outputs | Bidirectional signal terminals connected directly to upstream bus or controller side; no direction pin required. |
| GND (Pin 12) | Power ground | Reference return path for VCC, BIASV, and signal currents; must be low-impedance for noise immunity. |
| VCC (Pin 13) | Supply voltage | Powers internal FETs and bias circuitry; decoupling capacitor required within 1 cm of pin for stable switching. |
| B1–B10 (Pins 14–23) | Port B data inputs/outputs | Bidirectional terminals connected to hot-swappable card edge or downstream load; precharged to BIASV when OFF. |
| BIASV (Pin 24) | Bias voltage reference | User-supplied voltage (1.3 V to VCC) setting precharge level for B port; must be stable and low-noise. |
Key Features
| Feature | Design Value |
|---|---|
| Precharged B-port outputs | Reduces live-insertion noise by clamping B-side nodes to BIASV instead of letting them float, eliminating bus glitches during card insertion/removal. |
| 5-Ω typical RON | Enables high-current drive capability (up to 128 mA per channel) while maintaining <10 mV voltage drop at 50 mA - critical for TTL/LVTTL logic-level preservation. |
| TTL-compatible control inputs | Accepts standard 0.8 V / 2.0 V VIH/VIL thresholds - eliminates need for level shifters when interfacing with legacy 5-V microcontrollers or FPGAs. |
| Bidirectional signal path | Supports data flow in either direction without external direction control logic - simplifies PCB layout and reduces component count in full-duplex bus topologies. |
| Low input/output capacitance | 3.5 pF input and 4.5 pF off-state output capacitance limit signal degradation and crosstalk in high-density 10-bit parallel traces. |
Applications
| Backplane Hot-Swap Interface | Modular I/O Card Expansion |
|---|---|
Use Scenario: Inserting/removing daughter cards into a powered-backplane system without disrupting active communication on other slots. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating card-side signals (B port) from main backplane (A port); precharges B port to BIASV during insertion to suppress transient noise. Use Value: Eliminates need for complex hot-swap controllers or discrete precharge resistors - reduces BOM cost and board area while meeting IEC 61000-4-2 ESD immunity requirements. | Use Scenario: Adding real-time digital I/O modules (e.g., GPIO, encoder, or sensor interfaces) to programmable logic controllers (PLCs) without powering down the main CPU rack. IC Role / Device Role / Timing Role: Signal isolation and voltage-level translation between 3.3-V FPGA I/O banks (A port) and 5-V industrial sensors (B port) during module hot-plug. Use Value: Maintains deterministic timing (tpd < 0.35 ns) and prevents bus contention during reconfiguration - enabling seamless runtime I/O expansion in deterministic automation systems. |
| Telecom Line Card Interfacing | Test Equipment Signal Routing |
Use Scenario: Connecting field-replaceable line cards (e.g., T1/E1 interface modules) to a central switching fabric in carrier-grade routers. IC Role / Device Role / Timing Role: Low-RON analog switch enabling transparent 10-bit status/control bus access between management processor (A port) and line card ASIC (B port). Use Value: 5-Ω RON ensures <5 mV offset error over full 0–5 V range - preserving accuracy of voltage-mode diagnostics and configuration registers during hot-swap maintenance. | Use Scenario: Reconfigurable signal path routing in automated test equipment (ATE) where multiple DUT interfaces share a common measurement bus. IC Role / Device Role / Timing Role: High-speed multiplexer enabling dynamic assignment of 10-bit parallel data lines between DUT sockets and digitizer channels. Use Value: Sub-nanosecond tpd and <4.5 pF CO(OFF) preserve signal fidelity up to 500 MHz - supporting accurate high-speed digital pattern capture without added jitter or skew. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD6800ADBR | Includes bus-hold circuitry on B port; higher ICC (100 µA typical vs. 50 µA); same RON and pinout. | Eliminates need for external pull-up/down resistors on B port; better for unterminated stubs but increases static power. | Select SN74CBTD6800ADBR if bus-hold functionality is required to prevent floating states on unconnected B-side traces. |
| SN74LVC1G3157DCKR | Single-channel SPDT switch; 5.5-Ω RON; 5-V tolerant; different package (SC70-6) and pinout; no BIASV or precharge. | Not scalable to 10-bit; lacks live-insertion noise suppression; suitable only for point-to-point signal routing. | Choose SN74LVC1G3157DCKR only for low-channel-count, non-hot-swap applications where precharge is unnecessary and space is extremely constrained. |
Compared with SN74CBT6800ADBR, SN74CBTD6800ADBR adds bus-hold for enhanced noise immunity at the cost of higher quiescent current, while SN74LVC1G3157DCKR offers compact single-channel routing without live-insertion support - making SN74CBT6800ADBR the sole choice for 10-bit hot-swap bus isolation.
Availability
SN74CBT6800ADBR is available at Aetrix Electronics and suitable for backplane hot-swap interfaces, modular PLC I/O expansion, and telecom line card interconnects requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74CBT6800ADBR 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 U.S.-based semiconductor company specializing in analog, embedded processing, and logic solutions, with decades of leadership in industrial and communications interface ICs.
The SN74CBT6800ADBR belongs to TI's CBT (Crossbar Bus Transceiver) family, engineered specifically for high-speed, low-distortion bus switching in live-insertion and hot-swap systems - prioritizing signal integrity, noise suppression, and robustness under dynamic power conditions.
FAQ
What is the maximum continuous current per channel for the SN74CBT6800ADBR?
The SN74CBT6800ADBR supports a maximum continuous channel current of 128 mA, as specified in its absolute maximum ratings. This rating applies under steady-state conditions with proper thermal management and confirms the device's suitability for driving moderate-load parallel buses without derating at full temperature range. The SN74CBT6800ADBR maintains stable RON performance up to this current, ensuring predictable voltage drop and signal integrity.
Can the SN74CBT6800ADBR operate with a 3.3-V supply voltage?
No - the SN74CBT6800ADBR requires a minimum VCC of 4 V per its recommended operating conditions; it is not rated for 3.3-V operation. Attempting to power the SN74CBT6800ADBR at 3.3 V may result in undefined switching behavior, increased RON, or failure to meet timing specifications. For 3.3-V systems, consider TI's SN74CB3Q16245 or compatible LVC-family devices explicitly rated down to 1.65 V.
How does the BIASV pin function during normal operation of the SN74CBT6800ADBR?
During normal operation (ON = low), the BIASV pin has no active role - the A–B switch path is closed and B port follows A port signals. BIASV only becomes active when ON is high or VCC = 0 V, at which point the B port is precharged to the BIASV voltage via an internal ~10-kΩ equivalent resistor. This ensures the B port remains at a known DC level during hot-insertion, preventing noise coupling into adjacent channels. The SN74CBT6800ADBR relies on this controlled precharge to meet live-insertion reliability requirements.
Is the SN74CBT6800ADBR RoHS compliant and lead-free?
Yes - the SN74CBT6800ADBR is RoHS compliant and uses NiPdAu (NIPDAU) lead finish, as confirmed in TI's official packaging documentation. It meets JEDEC MSL Level-1 moisture sensitivity classification and supports peak reflow temperatures up to 260°C. The SN74CBT6800ADBR is suitable for lead-free assembly processes and complies with EU RoHS Directive 2011/65/EU and related environmental standards.
What is the thermal resistance (θJA) of the SN74CBT6800ADBR in its SSOP package?
The SN74CBT6800ADBR in the SSOP (DB) package has a junction-to-ambient thermal resistance (θJA) of 63°C/W, as specified in the absolute maximum ratings table. This value assumes standard JEDEC test board conditions (2-layer board, 1-in² copper pad). Actual thermal performance in end equipment depends on PCB layout, copper area, airflow, and nearby heat sources - designers should verify junction temperature using worst-case power dissipation (I2RON + ICCVCC) to ensure reliability across –40°C to +85°C operation.
SN74CBT6800ADBR 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:
- 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
SN74CBT6800ADBR FAQ
1.How can I place an order for SN74CBT6800ADBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT6800ADBR 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 SN74CBT6800ADBR reliable?
The price and inventory of SN74CBT6800ADBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT6800ADBR is usually 5 days.
3.What payment methods are accepted for SN74CBT6800ADBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT6800ADBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBT6800ADBR?
SN74CBT6800ADBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT6800ADBR 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 SN74CBT6800ADBR?
For technical support, including SN74CBT6800ADBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT6800ADBR requirements.
6.How does Aetrix verify that SN74CBT6800ADBR is sourced from the original manufacturer or authorized distributors?
All SN74CBT6800ADBR 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 SN74CBT6800ADBR meets industry standards.
7.What is the process for return or replacement of SN74CBT6800ADBR?
All SN74CBT6800ADBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT6800ADBR, 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 SN74CBT6800ADBR part is unused and in its original packaging.
Return procedure for SN74CBT6800ADBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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