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Texas Instruments SN74CBT6800PWR
- Part No.:
- SN74CBT6800PWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT6800PWR.pdf
- Description:
- IC 10-BIT FET BUS SW 24-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,000
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Product details
Overview
SN74CBT6800PWR from Texas Instruments is a 10-bit bidirectional bus switch with precharged B-port outputs for live insertion, featuring 5-Ω on-state resistance, TTL-compatible I/O levels, and operation from –40°C to 85°C. It enables zero-delay signal routing between A and B ports under low-enable control in industrial backplane and hot-swap subsystems.
For engineers reviewing the SN74CBT6800PWR datasheet, SN74CBT6800PWR pinout, SN74CBT6800PWR application, or SN74CBT6800PWR equivalent, key selection criteria include on-resistance (5–7 Ω), BIASV bias voltage range (1.3 V to VCC), precharge-enabled live-insertion noise suppression, and PW-package thermal dissipation (0.7 W at 55°C).
Technical Context
The SN74CBT6800PWR implements a single 10-bit switch with one active-low enable (ON) controlling bidirectional conduction between A1–A10 and B1–B10 ports. When enabled, it delivers near-zero propagation delay (0.25 ns typical) via low-ron MOSFET-based switching architecture.
Its precharge function applies BIASV through an internal ~10-kΩ equivalent resistor to B-port outputs during disable, minimizing ground bounce and signal distortion during hot-plug events. Bias voltage must be set between 1.3 V and VCC (4–5.5 V), and absolute limits restrict BIASV to –0.5 V to 6 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5–7 Ω at VCC = 4.5 V, ensuring minimal voltage drop and signal attenuation across switched paths |
| Propagation delay (tpd) | 0.25 ns typical (CL = 50 pF), enabling high-speed data bus isolation without timing penalty |
| BIASV input range | 1.3 V to VCC (4–5.5 V), defining user-selectable precharge level for live-insertion noise control |
| Supply voltage (VCC) | 4 V to 5.5 V, compatible with 5-V TTL and mixed-voltage system interfaces |
| Operating temperature | –40°C to +85°C, supporting industrial-grade reliability in embedded control and telecom infrastructure |
| Input clamp current | ±50 mA max, specifying safe transient overvoltage handling capability at control and I/O pins |
| Power dissipation (PW pkg) | 0.7 W at TA = 55°C, constraining thermal design margin for PCB layout in dense layouts |
Pinout & Package
SN74CBT6800PWR uses a 24-pin Thin Shrink Small-Outline (PW) package (5.0 mm × 6.2 mm, 0.65 mm pitch), optimized for space-constrained board designs while maintaining full 10-bit bus functionality and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ON (Pin 1) | Active-low enable input | Drives internal switch ON when low; disables A–B path and activates B-port precharge when high |
| A1–A10 (Pins 2–11) | Port A bidirectional I/O | Connects directly to upstream logic or controller; TTL-compatible input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) |
| GND (Pin 12) | Ground reference | Primary return path for switch current and bias circuit; must be low-impedance for noise control |
| VCC (Pin 13) | Positive supply | Powers internal switch logic and output drivers; requires local 0.1-µF decoupling |
| B1–B10 (Pins 14–23) | Port B bidirectional I/O | Precharged to BIASV during disable; carries live-insertion-sensitive signals in backplane applications |
| BIASV (Pin 24) | Bias voltage input | Sets precharge level for B-port; must be externally sourced within 1.3 V to VCC range |
Key Features
| Feature | Design Value |
|---|---|
| 10-bit bidirectional switching | Enables full-width data bus isolation without direction control logic or external buffers |
| 5-Ω on-state resistance | Minimizes IR drop and signal degradation across high-speed parallel interfaces up to 100 MHz |
| Precharged B-port outputs | Reduces ground bounce and false triggering during hot-swap by holding B-lines at stable BIASV |
| TTL-compatible I/O levels | Direct interface with legacy 5-V microcontrollers, FPGAs, and ASICs without level-shifting |
| PW package footprint | Delivers same 24-pin I/O count as standard SOIC but in <50% PCB area, easing high-density routing |
Applications
| Backplane Hot-Swap Modules | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Inserting/removing I/O cards into powered-backplane systems without disrupting communication on adjacent slots. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating card-side A-port from backplane B-port; precharges B-lines to BIASV during removal. Use Value: Eliminates ground bounce-induced glitches on shared backplane lines, verified with 0.25-ns tpd and 5-Ω ron. | Use Scenario: Adding modular analog/digital I/O modules to programmable logic controllers operating in factory environments. IC Role / Device Role / Timing Role: Isolating field-side sensor/actuator signals (B-port) from controller-side bus (A-port) with live-insertion support. Use Value: Enables maintenance without system shutdown; BIASV precharge prevents spurious PLC scan errors during module replacement. |
| Telecom Line Card Interfacing | Test Equipment Signal Routing |
Use Scenario: Connecting line cards to central switching fabric in carrier-grade DSLAMs or OLTs where uptime is critical. IC Role / Device Role / Timing Role: High-speed bus switch routing TDM or packet data between line card ASICs and fabric interface, with precharge during fault isolation. Use Value: Maintains signal integrity across 10-bit parallel paths at >50-MHz rates; 5-Ω ron ensures <1% attenuation at full load. | Use Scenario: Reconfigurable signal paths in automated test equipment (ATE) for probing multiple DUTs on a single fixture. IC Role / Device Role / Timing Role: Low-latency, bidirectional switch matrix element routing digital stimulus/response between tester channels and device pins. Use Value: 0.25-ns tpd supports sub-nanosecond timing margins; PW package allows dense channel packing on test head PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD6800PWR | Includes 3.3-V tolerant inputs; higher ICC (100 µA max); identical ron, tpd, and PW package | Required for mixed-voltage systems with 3.3-V control logic driving 5-V bus; not needed in pure 5-V designs | Select SN74CBTD6800PWR only if VIH/VIL thresholds must support 3.3-V signaling while retaining 5-V bus operation |
| 74LVC4066PW,118 | Quad SPST switch; 10-Ω ron; no BIASV precharge; 3.3-V only; different pinout and control logic | Suitable for low-pin-count, non-live-insertion analog/digital switching; lacks 10-bit coherency and hot-swap support | Choose only for cost-sensitive, low-channel-count applications where precharge and bus-width alignment are unnecessary |
Compared with SN74CBT6800PWR, SN74CBTD6800PWR adds 3.3-V input compatibility at higher quiescent current, while 74LVC4066PW,118 offers lower integration density and no live-insertion capability-making SN74CBT6800PWR optimal for 10-bit, 5-V, hot-swap-critical systems.
Availability
SN74CBT6800PWR is available at Aetrix Electronics and suitable for industrial PLC expansion, telecom line card interfacing, and backplane hot-swap modules requiring stable component supply, long-term lifecycle support, and consistent PW-package thermal performance.
Supply support for SN74CBT6800PWR 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 SN74CBT6800PWR belongs to TI's CBT (Crosspoint Bus Transceiver) family, engineered specifically for high-speed, low-distortion bus isolation in live-insertion and hot-swap systems.
FAQ
What is the maximum allowable BIASV voltage for SN74CBT6800PWR?
The absolute maximum BIASV voltage for SN74CBT6800PWR is 6 V, but the recommended operating range is 1.3 V to VCC (4–5.5 V). Exceeding 6 V risks permanent damage per the absolute maximum ratings table. For reliable live-insertion noise suppression, BIASV should be set near the expected B-port logic-high level-typically 2.4 V to 3.3 V when VCC = 5 V. The SN74CBT6800PWR datasheet specifies this limit explicitly in Section "Absolute Maximum Ratings".
Does SN74CBT6800PWR support bidirectional signal flow without direction control pins?
Yes, SN74CBT6800PWR supports fully bidirectional signal flow between A and B ports with no direction control required-the switch conducts equally in both directions when ON is low. This eliminates external direction logic and simplifies PCB routing in bus-isolation applications. Its MOSFET-based topology ensures symmetric ron (5–7 Ω) and tpd (0.25 ns) regardless of signal direction. The SN74CBT6800PWR function table confirms "Connect" for both A→B and B→A paths under low ON.
Can SN74CBT6800PWR operate with a 3.3-V supply instead of 5 V?
No, SN74CBT6800PWR is not rated for 3.3-V operation: its minimum recommended VCC is 4 V, and characterization is specified only from –40°C to 85°C at 4–5.5 V. Using 3.3 V violates the "Recommended Operating Conditions" and may cause undefined switching behavior or failure to drive TTL loads reliably. For 3.3-V systems, consider SN74CBTD6800PWR, which shares the same PW package and pinout but supports 3.3-V inputs. The SN74CBT6800PWR datasheet states VCC MIN = 4 V explicitly.
What is the thermal limitation of SN74CBT6800PWR in the PW package?
The SN74CBT6800PWR in the PW package has a maximum power dissipation of 0.7 W at TA = 55°C in still air, based on a junction temperature limit of 150°C. This value assumes standard JEDEC board trace conditions (750 mils). To maintain reliability, designers must ensure adequate copper pour, avoid adjacent heat sources, and verify junction temperature using θJA = 114°C/W (calculated from 0.7 W and 80°C ∆T). The SN74CBT6800PWR thermal data appears in the "Absolute Maximum Ratings" table.
How does the precharge function of SN74CBT6800PWR reduce live-insertion noise?
The SN74CBT6800PWR reduces live-insertion noise by precharging B-port outputs to BIASV via an internal ~10-kΩ equivalent resistor when ON is high-holding lines at a stable DC level instead of floating. This prevents ground bounce, false triggering, and bus contention during connector mating/unmating. Measured noise reduction is confirmed by suppressed transients in hot-swap testing per TI application notes. The SN74CBT6800PWR datasheet describes this mechanism in the "description" and "Function Table" sections.
SN74CBT6800PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 24-TSSOP (0.173", 4.40mm 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-TSSOP
SN74CBT6800PWR FAQ
1.How can I place an order for SN74CBT6800PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT6800PWR 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 SN74CBT6800PWR reliable?
The price and inventory of SN74CBT6800PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT6800PWR is usually 5 days.
3.What payment methods are accepted for SN74CBT6800PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT6800PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBT6800PWR?
SN74CBT6800PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT6800PWR 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 SN74CBT6800PWR?
For technical support, including SN74CBT6800PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT6800PWR requirements.
6.How does Aetrix verify that SN74CBT6800PWR is sourced from the original manufacturer or authorized distributors?
All SN74CBT6800PWR 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 SN74CBT6800PWR meets industry standards.
7.What is the process for return or replacement of SN74CBT6800PWR?
All SN74CBT6800PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT6800PWR, 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 SN74CBT6800PWR part is unused and in its original packaging.
Return procedure for SN74CBT6800PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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