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Texas Instruments SN74CBT6800CPWR
- Part No.:
- SN74CBT6800CPWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT6800CPWR.pdf
- Description:
- IC BUS SWITCH 10 X 1:1 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,621
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Product details
Overview
SN74CBT6800CPWR from Texas Instruments is a 10-bit bidirectional FET bus switch with TTL-compatible control, 3 Ω typical ON-state resistance, −2 V undershoot protection on A/B ports, and BIASV-biased precharge for live-insertion noise suppression in PCI hot-plug systems.
For engineers reviewing the SN74CBT6800CPWR datasheet, SN74CBT6800CPWR pinout, SN74CBT6800CPWR application, or SN74CBT6800CPWR equivalent, key selection criteria include its 0.15 ns propagation delay at 5 V, Ioff partial-power-down support, 5.5 pF OFF-state I/O capacitance, and TSSOP-24 package compatibility with high-density PCB layouts.
Technical Context
This device implements a 10-channel analog/digital signal path using low-Ron FET switches controlled by a single active-low ON input. Its undershoot-protection circuitry actively clamps A/B port voltages down to −2 V while maintaining OFF-state isolation, and the BIASV terminal enables user-configurable biasing of the B port to minimize threshold-crossing glitches during hot insertion.
The switch supports mixed-voltage signaling (0–5 V) across data I/Os and accepts TTL- or CMOS-level control inputs. Its Ioff specification guarantees no backflow current when VCC = 0 V, enabling safe partial-power-down operation in multi-rail systems without external isolation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ON-state resistance (ron) | 3 Ω typical - ensures minimal voltage drop and signal distortion under 64 mA load |
| Propagation delay (tpd) | 0.15 ns at VCC = 5 V - enables high-speed bidirectional data transfer with near-zero latency |
| I/O capacitance (Cio(OFF)) | 5.5 pF typical - reduces capacitive loading on buses and preserves signal edge integrity |
| Supply voltage (VCC) | 4 V to 5.5 V - compatible with standard 5-V logic rails and tolerant of supply droop |
| Undershoot protection | −2 V on A/B ports - prevents false triggering and latch-up during transient negative excursions |
| BIASV range | 0 V to VCC - allows precise matching to receiver input thresholds (e.g., 2.4 V for 3.3-V LVTTL) |
| Ioff leakage | 10 µA max at VCC = 0 V - blocks damaging back-current during power sequencing or partial shutdown |
Pinout & Package
TSSOP-24 package (PW), 7.9 mm × 4.5 mm × 1.2 mm height, lead pitch 0.65 mm, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A10 | Data input/output (A-side) | 10 bidirectional signal terminals connected to one side of the bus switch array |
| B1–B10 | Data input/output (B-side) | 10 bidirectional signal terminals connected to the other side; precharged to BIASV when OFF |
| ON | Active-low enable | Low = switch ON (A↔B connected); High = switch OFF (high-Z + BIASV precharge) |
| BIASV | Bias supply reference | User-supplied voltage (0–VCC) setting precharge level for B-port termination during OFF state |
| VCC | Power supply | Primary 4–5.5 V supply powering internal logic and switch FETs |
| GND | Ground reference | Common return path for VCC, BIASV, and all signal currents |
Key Features
| Feature | Design Value |
|---|---|
| Live-insertion noise suppression | BIASV-controlled B-port precharge eliminates threshold-crossing glitches during card hot-plug into active buses |
| PCI Hot Plug compliance | Integrated undershoot protection (−2 V), Ioff, and fast switching meet PCI SIG mechanical/electrical requirements |
| Mixed-signal voltage interoperability | Data I/Os support 0–5 V signaling levels - interoperate with 0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, and 5 V logic families |
| Partial-power-down safety | Ioff limits back-current to ≤10 µA when VCC = 0 V - enables safe isolation in multi-supply systems without external circuitry |
| Low-distortion signal gating | 3 Ω ron and 5.5 pF Cio(OFF) preserve signal rise/fall times and reduce crosstalk in high-speed bus isolation |
Applications
| PCI Bus Isolation | Memory Interleaving Interface |
|---|---|
Use Scenario: Isolating add-in cards from main system bus during hot-plug insertion/removal in desktop/server motherboards. IC Role / Device Role / Timing Role: Bidirectional bus switch providing ON/OFF-controlled signal path between PCI slot and system controller with undershoot protection. Use Value: Prevents bus glitches and receiver mis-triggering via BIASV precharge aligned to PCI receiver thresholds (2.0–2.4 V). | Use Scenario: Enabling dynamic routing of address/data lines between two memory banks in dual-channel DDR subsystems. IC Role / Device Role / Timing Role: Low-latency (0.15 ns) 10-bit switch enabling time-critical address mirroring or bank-select multiplexing. Use Value: Near-zero propagation delay avoids timing skew; 3 Ω ron minimizes voltage drop across shared control lines. |
| Low-Distortion Signal Gating | Legacy Interface Bridging |
Use Scenario: Gating analog sensor outputs or high-fidelity digital audio streams without introducing harmonic distortion or jitter. IC Role / Device Role / Timing Role: Analog-capable FET switch with flat ron vs. voltage curve and sub-6 pF OFF capacitance. Use Value: 5.5 pF Cio(OFF) and 3 Ω ron preserve signal integrity for bandwidths up to 500 MHz in test equipment front-ends. | Use Scenario: Interfacing 3.3-V FPGA I/O banks to legacy 5-V peripheral controllers in industrial PLC modules. IC Role / Device Role / Timing Role: Level-translating bidirectional switch supporting 0–5 V I/O swing and TTL/CMOS-compatible control. Use Value: Eliminates need for discrete level shifters; 4–5.5 V VCC range ensures robust operation across aging 5-V rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD6800CPWR | Includes 3.3-V tolerant control inputs (VIH = 2 V max); otherwise identical pinout, ron, and BIASV functionality | Preferred where host controller uses 3.3-V logic but bus operates at 5 V - avoids level-shifter on ON input | Select when ON signal originates from 3.3-V domain and must guarantee VIH margin without external buffering |
| SN74CB3Q3257PWR | 4-channel, 2:1 multiplexer (not bus switch); no BIASV or undershoot protection; 4 Ω ron; supports 1.65–5.5 V VCC | Suitable for channel-select routing, not bidirectional bus isolation or hot-plug scenarios | Choose only for static signal routing where live-insertion immunity and B-port precharge are unnecessary |
Compared with SN74CBT6800CPWR, SN74CBTD6800CPWR adds 3.3-V control compatibility without sacrificing hot-plug features, while SN74CB3Q3257PWR trades bus-switch functionality for multiplexing flexibility at the cost of missing critical live-insertion protections.
Availability
SN74CBT6800CPWR is available at Aetrix Electronics and suitable for PCI interface design, memory interleaving architectures, bus isolation circuits, and low-distortion signal gating applications requiring stable component supply and long-term manufacturability.
Supply support for SN74CBT6800CPWR 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 connectivity solutions with emphasis on reliability, precision, and power efficiency.
The SN74CBT6800C series belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for hot-pluggable computing interfaces, memory subsystems, and mixed-voltage signal routing where low distortion, fast switching, and robust fault tolerance are mandatory.
FAQ
What is the maximum undershoot voltage the SN74CBT6800CPWR can tolerate on its A and B ports?
The SN74CBT6800CPWR provides active undershoot protection down to −2 V on both A and B ports, as verified in the SCDS138 datasheet Section 4 (Absolute Maximum Ratings) and confirmed in the functional description. This protection remains effective across the full −40°C to 85°C operating temperature range and prevents false switching or damage during transient negative excursions caused by connector bounce or cable reflections. The SN74CBT6800CPWR achieves this via internal clamp circuitry that maintains OFF-state integrity even when port voltages dip below ground.
Does the SN74CBT6800CPWR support partial-power-down operation, and how is it implemented?
Yes, the SN74CBT6800CPWR fully supports partial-power-down operation via its Ioff specification. When VCC = 0 V, the device limits back-current through powered-down I/Os to ≤10 µA, preventing damaging current flow from live buses into the unpowered IC. This behavior is guaranteed per JESD 78 Class II latch-up testing and is independent of ON pin state or BIASV voltage. The SN74CBT6800CPWR achieves this through internal FET cutoff design, eliminating the need for external isolation components in multi-rail systems.
What is the role of the BIASV pin on the SN74CBT6800CPWR, and what voltage range is valid?
The BIASV pin on the SN74CBT6800CPWR sets the precharge voltage applied to the B port when the switch is disabled (ON = high) or powered down (VCC = 0 V). It must be supplied within 0 V to VCC, and is typically set to match the input threshold voltage of downstream receivers (e.g., 2.4 V for 3.3-V LVTTL). This precharge minimizes live-insertion noise by ensuring B-port signals remain outside the receiver's switching threshold region during card mating. The SN74CBT6800CPWR draws negligible current from BIASV - approximately 0.25 mA at BIASV = 2.4 V per datasheet electrical characteristics.
Can the SN74CBT6800CPWR be used for analog signal switching, and what parameters support that use case?
Yes, the SN74CBT6800CPWR is qualified for analog signal switching due to its flat ON-resistance (3 Ω typical, 6 Ω max), low OFF-capacitance (5.5 pF), and rail-to-rail voltage handling (−0.5 V to 7 V on I/O pins). Its FET-based architecture provides symmetrical conduction and minimal charge injection, making it suitable for DC-coupled audio paths, sensor signal routing, and test equipment multiplexing. The SN74CBT6800CPWR maintains consistent ron across 0–5 V signal swings, preserving linearity and minimizing harmonic distortion in analog applications.
What is the recommended power-up sequencing for the SN74CBT6800CPWR to ensure high-impedance state at startup?
To guarantee high-impedance state during power-up, the ON pin of the SN74CBT6800CPWR must be held high (disabled) until VCC stabilizes. TI recommends tying ON to VCC through a pullup resistor; the minimum value depends on the driver's sink capability but is typically ≥10 kΩ. This prevents momentary connection between A and B ports during VCC ramp, avoiding bus contention. The SN74CBT6800CPWR datasheet explicitly states this requirement in the "Ordering Information" section and confirms isolation is maintained during power transitions when ON is properly biased.
SN74CBT6800CPWR 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:
- Active
- 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
SN74CBT6800CPWR FAQ
1.How can I place an order for SN74CBT6800CPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT6800CPWR 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 SN74CBT6800CPWR reliable?
The price and inventory of SN74CBT6800CPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT6800CPWR is usually 5 days.
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SN74CBT6800CPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT6800CPWR 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 SN74CBT6800CPWR?
For technical support, including SN74CBT6800CPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT6800CPWR requirements.
6.How does Aetrix verify that SN74CBT6800CPWR is sourced from the original manufacturer or authorized distributors?
All SN74CBT6800CPWR 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 SN74CBT6800CPWR meets industry standards.
7.What is the process for return or replacement of SN74CBT6800CPWR?
All SN74CBT6800CPWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT6800CPWR, 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 SN74CBT6800CPWR part is unused and in its original packaging.
Return procedure for SN74CBT6800CPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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