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Texas Instruments SN74CBT6800CDW
- Part No.:
- SN74CBT6800CDW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBT6800CDW.pdf
- Description:
- IC BUS SWITCH 10 X 1:1 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,200
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Product details
Overview
SN74CBT6800CDW 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 B-port precharge via BIASV for live-insertion noise suppression in PCI hot-plug systems.
For engineers reviewing the SN74CBT6800CDW datasheet, SN74CBT6800CDW pinout, SN74CBT6800CDW application, or SN74CBT6800CDW 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 SOIC-24 package compatibility with industrial bus isolation and memory interleaving designs.
Technical Context
This device implements a 10-channel analog/digital signal gate using low-Ron NMOS FETs controlled by a single active-low ON input. Its internal undershoot-protection circuitry actively clamps A/B port voltages down to −2 V while maintaining OFF-state integrity during transient events.
The B port is precharged to an externally supplied BIASV (0–VCC) through an internal ~10-kΩ path when ON is high or VCC = 0 V, enabling precise threshold alignment with downstream receivers to suppress live-insertion glitches. Ioff functionality ensures backflow current blocking during partial power-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - supports standard 5-V TTL/CMOS logic rails with margin for supply variation |
| ron (Typ) | 3 Ω - enables near-zero voltage drop and minimal signal attenuation across 10-bit data paths |
| tpd (Typ) | 0.15 ns at VCC = 5 V - delivers sub-nanosecond propagation for high-speed bus gating without timing skew |
| Cio(OFF) | 5.5 pF - minimizes capacitive loading on isolated buses, preserving signal edge rates and integrity |
| Ioff | 10 µA max at VCC = 0 V - guarantees isolation and prevents damaging back-current during system power sequencing |
| Undershoot Protection | −2 V on A/B ports - maintains OFF-state reliability during connector mating transients in hot-plug environments |
| BIASV Range | 0 V to VCC - allows user-selectable precharge level to match receiver input thresholds and suppress insertion noise |
Pinout & Package
SN74CBT6800CDW uses a 24-pin SOIC (DW) package with 1.27 mm pitch, 7.5 mm × 15.4 mm body, and standard JEDEC MO-001AC footprint. Pin 1 is located at top-left corner with index area marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A10 | Input/Output port A | 10-bit bidirectional data channel connected to B port when ON = L; supports 0–5 V signaling levels |
| B1–B10 | Input/Output port B | 10-bit bidirectional data channel; internally precharged to BIASV when switch is OFF or powered down |
| ON | Active-low enable | Low = A↔B connection; high = high-Z isolation + B-port precharge; requires pull-up to VCC for power-up safety |
| BIASV | Bias voltage supply | User-supplied reference (0–VCC) setting precharge level on B port to minimize live-insertion noise |
| VCC | Power supply | 4–5.5 V main supply; powers internal logic and FET switches; enables Ioff behavior when at 0 V |
| GND | Ground reference | Common return for VCC, BIASV, and all I/O; required for undershoot clamp diode operation |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional low-Ron switching | 3 Ω typical ron enables lossless 10-bit data transfer between mixed-voltage domains (0.8 V to 5 V) |
| Live-insertion noise suppression | B-port precharge to user-defined BIASV eliminates threshold-crossing glitches during card insertion into active buses |
| Robust undershoot immunity | Active clamping protects A/B ports to −2 V, preventing false triggering or latch-up during connector mating transients |
| Partial-power-down support | Ioff limits reverse current to 10 µA when VCC = 0 V, enabling safe integration into multi-rail systems with staggered power sequencing |
| Hot-plug compliance | Meets PCI Hot Plug specification requirements via combined undershoot protection, precharge, and Ioff features |
Applications
| PCI Hot-Plug Backplane Interface | Memory Interleaving Bus Isolation |
|---|---|
|
Use Scenario: Inserting/removing add-in cards into live PCI backplanes without disrupting host bus operation. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating card-side signals from main bus; provides glitch-free connection via BIASV precharge and undershoot protection. Use Value: Eliminates bus corruption during hot-swap events by ensuring B-port voltage remains above receiver input threshold during pin engagement. |
Use Scenario: Enabling/disabling memory modules in dual-channel DDR architectures to reduce contention and optimize bandwidth allocation. IC Role / Device Role / Timing Role: Low-latency 10-bit gate controlling data flow between memory controller and DIMM banks; operates with <0.2 ns tpd. Use Value: Prevents signal reflection and crosstalk during memory bank switching via 5.5 pF Cio(OFF) and matched impedance routing. |
| Industrial I/O Module Signal Gating | Legacy System Voltage Translation Bridge |
|
Use Scenario: Isolating sensor/actuator interfaces in programmable logic controllers during firmware updates or fault recovery. IC Role / Device Role / Timing Role: High-reliability signal gate with Ioff and −2 V undershoot tolerance for noisy factory-floor environments. Use Value: Maintains functional safety by blocking backfeed current during partial power-down and surviving ESD/transient events per JESD22. |
Use Scenario: Interfacing 3.3-V FPGA I/O banks with 5-V legacy peripherals in test equipment and instrumentation. IC Role / Device Role / Timing Role: Level-agnostic bidirectional switch supporting 0–5 V signaling without external level shifters. Use Value: Reduces BOM count and PCB area by eliminating discrete translation ICs while preserving signal fidelity via 3 Ω ron and low Cio. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD6800CDW | Includes 3-state outputs and higher drive strength; no BIASV pin; ron = 4 Ω typical | Lacks live-insertion precharge; suited for static bus isolation rather than hot-plug systems | Select when BIASV functionality is unnecessary and higher output current (±128 mA) is required |
| SN74CB3Q3257PWR | 4-channel, 2:1 multiplexer with 3.5 Ω ron; no undershoot protection; BIASV absent; TSSOP-16 package | Lower channel count and no hot-plug features; optimized for compact mux-based signal routing | Choose for space-constrained designs needing channel selection over full 10-bit bus gating |
Compared with SN74CBT6800CDW, SN74CBTD6800CDW trades BIASV-driven live-insertion robustness for stronger drive capability, while SN74CB3Q3257PWR offers multiplexing flexibility in smaller form factor but omits critical hot-plug protections essential for PCI-compliant systems.
Availability
SN74CBT6800CDW is available at Aetrix Electronics and suitable for PCI hot-plug interface design, memory interleaving architecture, and industrial I/O module signal gating requiring stable component supply and long-term manufacturability.
Supply support for SN74CBT6800CDW 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-speed interface solutions.
The SN74CBT6800CDW belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for low-distortion, low-latency signal gating in hot-plug-capable computing and industrial backplane systems.
FAQ
What is the maximum undershoot voltage the SN74CBT6800CDW can withstand on its A and B ports?
The SN74CBT6800CDW provides active undershoot protection up to −2 V on both A and B ports, as verified in the absolute maximum ratings and functional testing sections of the SCDS138 datasheet. This protection is implemented via internal clamp circuitry that holds the switch in the OFF state during transient undershoot events, preventing erroneous conduction or damage. The −2 V rating applies across the full operating temperature range of −40°C to 85°C.
How does the BIASV pin function in the SN74CBT6800CDW during hot-plug insertion?
The BIASV pin on the SN74CBT6800CDW supplies a user-defined bias voltage (0 V to VCC) used to precharge the B port through an internal ~10-kΩ path when the ON input is high or VCC = 0 V. During hot-plug insertion, this precharge holds the B-port voltage near the input threshold of downstream receivers, preventing signal transitions from crossing the logic threshold region and causing glitches. This mechanism is explicitly validated for PCI Hot Plug compliance in the device's application description.
Does the SN74CBT6800CDW support partial-power-down operation, and how is it implemented?
Yes, the SN74CBT6800CDW supports partial-power-down operation via its Ioff feature. When VCC = 0 V, the device limits reverse current to ≤10 µA even with up to 5.5 V applied to I/O pins, preventing damaging backflow through powered-down sections of the system. This behavior is characterized in the electrical specifications table and confirmed under recommended operating conditions where Ioff is guaranteed across the full temperature range.
What is the typical ON-state resistance (ron) of the SN74CBT6800CDW, and how does it affect signal integrity?
The SN74CBT6800CDW has a typical ON-state resistance of 3 Ω at VCC = 4.5 V and IO = 30 mA, as measured per the datasheet's ron test conditions. This low ron minimizes voltage drop and power dissipation across the 10-bit switch path, preserving signal amplitude and reducing distortion-especially critical in high-speed digital and analog signal gating applications such as memory interleaving and PCI bus isolation.
Can the SN74CBT6800CDW be used with mixed-voltage signaling, and what level ranges does it support?
Yes, the SN74CBT6800CDW supports bidirectional 0–5 V signaling across its A and B ports, enabling interoperability between 0.8-V, 1.2-V, 1.5-V, 1.8-V, 2.5-V, 3.3-V, and 5-V logic families without external level translators. This capability is explicitly stated in the "Data and Control Inputs" section of the datasheet and validated across the full VI/O range of 0–5.5 V under recommended operating conditions.
SN74CBT6800CDW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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-SOIC
SN74CBT6800CDW FAQ
1.How can I place an order for SN74CBT6800CDW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT6800CDW 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 SN74CBT6800CDW reliable?
The price and inventory of SN74CBT6800CDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT6800CDW is usually 5 days.
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Once your SN74CBT6800CDW 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 SN74CBT6800CDW?
For technical support, including SN74CBT6800CDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT6800CDW requirements.
6.How does Aetrix verify that SN74CBT6800CDW is sourced from the original manufacturer or authorized distributors?
All SN74CBT6800CDW 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 SN74CBT6800CDW meets industry standards.
7.What is the process for return or replacement of SN74CBT6800CDW?
All SN74CBT6800CDW units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT6800CDW, 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 SN74CBT6800CDW part is unused and in its original packaging.
Return procedure for SN74CBT6800CDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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