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Texas Instruments SN74CBT6800APWR
- Part No.:
- SN74CBT6800APWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT6800APWR.pdf
- Description:
- IC BUS SWITCH 10 X 1:1 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,099
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Product details
Overview
SN74CBT6800APWR from Texas Instruments is a 10-bit FET bus switch with precharged outputs in a 24-pin TSSOP package, featuring 5-Ω on-state resistance, TTL-compatible inputs, and user-selectable BIASV bias voltage for live-insertion noise suppression in hot-swap backplane applications.
For engineers reviewing the SN74CBT6800APWR datasheet, SN74CBT6800APWR pinout, SN74CBT6800APWR application, or SN74CBT6800APWR equivalent, this device supports bidirectional signal routing with near-zero propagation delay (0.25 ns typical at 5 V), low ICC (50 µA max), and controlled output precharge via BIASV to minimize transients during hot-plug events.
Technical Context
The SN74CBT6800APWR implements a single-enable, 10-bit FET-based analog switch architecture with independent A–B port connectivity. Its on-state resistance (3–7 Ω) is specified across VI = 0 V to 2.4 V and II = 15–64 mA, enabling low-distortion signal pass-through for data buses up to 100 MHz.
When ON is high or VCC = 0 V, the B port is actively precharged to BIASV through an internal ~10-kΩ equivalent resistor - a design feature explicitly intended to suppress floating-bus noise during live insertion. The device operates over –40°C to 85°C with VCC = 4–5.5 V and BIASV = 1.3 V to VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 3–7 Ω typical; ensures minimal voltage drop and signal attenuation across A/B ports under load. |
| Propagation delay (tpd) | 0.25 ns typical at VCC = 5 V; enables high-speed bidirectional data transfer without timing skew. |
| BIASV range | 1.3 V to VCC; allows user-configurable precharge level to match system logic thresholds and reduce ground bounce. |
| Supply current (ICC) | 50 µA max at VCC = 5.5 V; supports low-power standby operation in always-on systems. |
| Input capacitance (Ci) | 3.5 pF; minimizes loading on upstream drivers and preserves signal integrity in dense PCB layouts. |
| Off-state capacitance (Co(OFF)) | 4.5 pF; reduces crosstalk and coupling between adjacent switched lines in multi-channel buses. |
| Operating temperature | –40°C to +85°C; qualified for industrial-grade embedded and telecom infrastructure use. |
Pinout & Package
TSSOP-24 (PW) package, 7.8 mm × 4.4 mm × 1.2 mm max height, lead pitch 0.65 mm, NIPDAU lead finish, MSL Level-1 (260°C reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ON | Active-low enable input | Drives all 10 switches ON when low; disables A–B path and activates B-port precharge when high. |
| A1–A10 | Port A input/output terminals | Bidirectional signal interface connected directly to upstream logic or controller bus. |
| B1–B10 | Port B input/output terminals | Bidirectional interface to downstream bus or hot-pluggable module; precharged to BIASV when disabled. |
| VCC | Positive supply | Provides power for internal FET control circuitry; must be stable within 4–5.5 V for guaranteed operation. |
| GND | Ground reference | Common return path for all switching currents and bias circuits; requires low-impedance PCB connection. |
| BIASV | User-defined precharge voltage source | External bias rail that sets B-port DC level during disable; must be ≥1.3 V and ≤VCC. |
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 spikes. |
| Low 5-Ω on-resistance | Minimizes insertion loss and maintains signal amplitude integrity for 3.3 V and 5 V TTL/CMOS buses. |
| TTL-compatible control inputs | Accepts standard 0.8 V/2.0 V logic thresholds without level-shifting, simplifying integration with legacy controllers. |
| Bidirectional signal routing | Supports data flow in either direction without direction-control pins, reducing PCB routing complexity. |
| 10-bit single-enable architecture | Enables synchronized switching of all channels with one control line, ideal for parallel bus isolation. |
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; B-port precharge prevents glitches on shared data lines. Use Value: Eliminates need for external pull-up/down resistors and reduces transient-induced CRC errors during hot-plug events. |
Use Scenario: Isolating add-in cards from motherboard PCI bus during power sequencing or fault conditions. IC Role / Device Role / Timing Role: High-speed analog switch enabling/disabling 32-bit address/data paths with sub-nanosecond delay and no direction control overhead. Use Value: Prevents bus contention during card reset and supports deterministic power-up timing without software intervention. |
| Legacy System Bus Expansion | Industrial I/O Module Multiplexing |
Use Scenario: Adding peripheral modules to aging industrial controllers using 5 V TTL parallel interfaces. IC Role / Device Role / Timing Role: 10-bit bus switch extending microcontroller GPIO or parallel port signals to modular daughterboards. Use Value: Maintains signal fidelity across long traces and enables modular upgrades without redesigning core controller PCB. |
Use Scenario: Sharing limited microcontroller parallel I/O lines among multiple sensor/actuator modules in factory automation. IC Role / Device Role / Timing Role: Time-multiplexed signal routing hub allowing one set of MCU pins to drive multiple isolated I/O banks. Use Value: Reduces MCU pin count requirements and avoids bus contention via hardware-controlled channel selection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD6800APWR | Includes bus-hold circuitry on B-port; higher ICC (100 µA); same pinout and ron. | Eliminates external pull-ups in unconnected states but increases quiescent current. | Select when B-port lines may float unconnected and bus-hold stability is preferred over ultra-low ICC. |
| 74LVC1G3157DCKR | Single-pole double-throw (SPDT) 2-channel switch; 6 Ω ron; no BIASV or precharge capability. | Limited to 2-bit routing; lacks live-insertion support and multi-bit synchronization. | Select only for simple point-to-point signal switching where precharge and 10-bit coordination are unnecessary. |
Compared with SN74CBT6800APWR, SN74CBTD6800APWR adds bus-hold but trades off current efficiency, while 74LVC1G3157DCKR offers compactness at the cost of scalability and live-insertion robustness - making SN74CBT6800APWR optimal for synchronized, noise-sensitive 10-bit hot-swap interfaces.
Availability
SN74CBT6800APWR is available at Aetrix Electronics and suitable for hot-swap backplane interfaces, PCI bus isolation, and industrial I/O expansion requiring stable component supply, full lifecycle traceability, and industrial-temperature grade performance.
Supply support for SN74CBT6800APWR 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 decades of expertise in high-reliability interface solutions.
The SN74CBT6800APWR belongs to TI's CBT (Crossbar Bus Transceiver) family, designed specifically for low-distortion, high-speed bus switching in live-insertion and hot-swap systems where signal integrity and transient suppression are critical.
FAQ
What is the maximum continuous current rating per channel for the SN74CBT6800APWR?
The SN74CBT6800APWR supports a continuous channel current of 128 mA per switch path, verified under absolute maximum ratings. This rating ensures reliable operation when driving typical TTL/CMOS loads across the full –40°C to +85°C temperature range without thermal derating in standard PCB layouts.
Can the SN74CBT6800APWR operate with a 3.3 V supply voltage?
No - the SN74CBT6800APWR requires VCC between 4 V and 5.5 V per recommended operating conditions. Operation below 4 V is not characterized and may result in undefined on-resistance, increased propagation delay, or failure to meet TTL input threshold specifications. For 3.3 V systems, consider TI's LVC-series alternatives.
How does the BIASV pin function during normal enabled operation of the SN74CBT6800APWR?
During normal operation (ON = low), the BIASV pin has no active role - it is effectively disconnected from the B-port. Precharge only engages when ON is high or VCC = 0 V. Therefore, BIASV can remain unconnected or tied to a stable voltage without affecting signal pass-through behavior while the switch is enabled.
Is the SN74CBT6800APWR pin-compatible with other packages in the same family?
Yes - the SN74CBT6800APWR shares identical pin numbering and signal assignment with SN74CBT6800ADW (SOIC), SN74CBT6800ADBR (SSOP), and SN74CBT6800ADBQR (QSOP). All variants use the same 24-pin functional layout, enabling direct PCB footprint interchangeability where package height and thermal constraints allow.
Does the SN74CBT6800APWR require external pull-up or pull-down resistors on its control inputs?
No - the SN74CBT6800APWR features TTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and specifies that unused control inputs must be held at VCC or GND. No external resistors are needed if driven directly by compatible logic; however, floating inputs must be avoided to prevent increased ICC and potential oscillation.
SN74CBT6800APWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-TSSOP
SN74CBT6800APWR FAQ
1.How can I place an order for SN74CBT6800APWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT6800APWR 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 SN74CBT6800APWR reliable?
The price and inventory of SN74CBT6800APWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT6800APWR is usually 5 days.
3.What payment methods are accepted for SN74CBT6800APWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT6800APWR transactions.
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4.How is shipping managed for SN74CBT6800APWR?
SN74CBT6800APWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT6800APWR 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 SN74CBT6800APWR?
For technical support, including SN74CBT6800APWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT6800APWR requirements.
6.How does Aetrix verify that SN74CBT6800APWR is sourced from the original manufacturer or authorized distributors?
All SN74CBT6800APWR 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 SN74CBT6800APWR meets industry standards.
7.What is the process for return or replacement of SN74CBT6800APWR?
All SN74CBT6800APWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT6800APWR, 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 SN74CBT6800APWR part is unused and in its original packaging.
Return procedure for SN74CBT6800APWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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