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Texas Instruments SN74CBTK6800DWR
- Part No.:
- SN74CBTK6800DWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBTK6800DWR.pdf
- Description:
- IC BUS SWITCH 10 X 1:1 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,000
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Product details
Overview
SN74CBTK6800DWR from Texas Instruments is a 10-bit FET bus switch with precharged outputs and active-clamp undershoot protection, designed for high-speed TTL-compatible signal routing in hot-swap applications. It features 5-Ω on-state resistance, ±2-V undershoot clamping, and B-port precharge to user-selectable BIASV (1.3 V to VCC) to suppress live-insertion noise.
For engineers reviewing the SN74CBTK6800DWR datasheet, SN74CBTK6800DWR pinout, SN74CBTK6800DWR application, or SN74CBTK6800DWR equivalent, this device is selected for bidirectional low-distortion switching in backplane interfaces, memory expansion modules, and modular computing systems requiring robust ESD/undershoot resilience and zero-power disable capability.
Technical Context
The SN74CBTK6800DWR implements a single-enable 10-bit analog switch architecture using NMOS pass transistors with integrated bias control and active undershoot clamping circuitry. Its ON input operates with TTL-compatible thresholds (VIL ≤ 0.8 V, VIH ≥ 2 V), and the B port is precharged via an internal ~10-kΩ path to BIASV when disabled or unpowered.
Undershoot protection activates dynamically: when any I/O voltage drops below –2 V, the active-clamp circuit supplies current from VCC to limit excursion and prevent parasitic turn-on of the pass transistor. Latch-up immunity exceeds 100 mA per JESD 78 Class II, and ESD ratings meet 2000-V HBM, 200-V MM, and 1000-V CDM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 3 Ω to 7 Ω typical - enables near-zero propagation delay and minimal voltage drop across switched signals. |
| Propagation delay (tpd) | 0.25 ns at VCC = 5 V - supports >1 GHz signal integrity in high-speed parallel buses. |
| Undershoot clamp range | Clamps to –2 V - prevents negative transients from forward-biasing substrate diodes during hot-plug events. |
| BIASV range | 1.3 V to VCC - allows precharge alignment with system reference voltage to eliminate floating-node noise. |
| Power-off disable | VCC = 0 V disables switch and precharges B port - permits safe live insertion without bus contention. |
| ESD protection | 2000-V HBM, 200-V MM, 1000-V CDM - meets industrial-grade reliability requirements without external protection. |
| Operating temperature | –40°C to +85°C - qualified for extended-temperature embedded and telecom infrastructure use. |
Pinout & Package
SN74CBTK6800DWR is housed in a 24-pin SOIC (DW) package measuring 15.4 mm × 7.5 mm × 2.35 mm (max height), with 0.65 mm lead pitch and gull-wing leads. The package is RoHS-compliant, moisture sensitivity level (MSL) 2–260°C/1 year, and rated for reflow soldering per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ON | Active-low enable input | Drives switch ON when low (≤0.8 V); places B port in precharge mode when high or VCC = 0 V. |
| A1–A10 | Input/output port A | Bidirectional signal path connected to B1–B10 when ON = L; high-impedance when disabled. |
| B1–B10 | Input/output port B | Bidirectional path tied to A1–A10 when enabled; precharged to BIASV via ~10-kΩ resistor when disabled. |
| BIASV | Bias voltage supply | User-supplied reference (1.3 V to VCC) setting precharge level for B port during hot-swap transitions. |
| VCC | Positive supply | 4 V to 5.5 V operation; powers undershoot clamp and internal logic; must be present for active clamping. |
| GND | Ground reference | Common return for VCC, BIASV, and all I/O; required for proper clamp current path and ESD discharge. |
Key Features
| Feature | Design Value |
|---|---|
| Precharged B-port outputs | Reduces live-insertion noise by holding B1–B10 at stable BIASV instead of floating, eliminating transient glitches during board mating. |
| Active-clamp undershoot protection | Supplies controlled current from VCC to clamp I/O excursions down to –2 V, preventing latch-up and false triggering in noisy backplanes. |
| TTL-compatible control inputs | Accepts standard 0.8 V / 2.0 V logic thresholds without level-shifting, simplifying integration with legacy microcontrollers and FPGAs. |
| Low on-resistance (3–7 Ω) | Minimizes RC delay and signal attenuation in 50-Ω–100-Ω transmission environments, preserving edge fidelity in wide parallel buses. |
| Power-off disable with precharge | Ensures B port remains biased even when VCC is removed, enabling true hot-swap capability without external pull-ups or charge pumps. |
Applications
| Modular Backplane Interconnect | Memory Expansion Subsystem |
|---|---|
|
Use Scenario: Hot-pluggable daughter cards connecting to a main chassis backplane carrying address/data/control lines. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating card-side signals from main backplane during insertion/removal while maintaining DC bias. Use Value: Precharged B port eliminates floating-line noise; active undershoot clamp absorbs connector bounce transients, preventing system resets. |
Use Scenario: Adding DDR SDRAM or SRAM modules to an embedded controller via edge-card slot with shared data bus. IC Role / Device Role / Timing Role: Low-latency, low-distortion signal path between processor and memory module, enabled only during active access cycles. Use Value: 0.25-ns propagation delay preserves timing margins; 5-Ω ron ensures <10 mV drop at 30 mA, supporting clean read/write strobes. |
| Industrial I/O Module Carrier | Test Equipment Signal Routing Matrix |
|
Use Scenario: Field-replaceable I/O modules (analog/digital) plugged into a central PLC carrier board under powered conditions. IC Role / Device Role / Timing Role: Isolation switch protecting host bus from module power-up sequencing faults and ESD events during insertion. Use Value: 2000-V HBM/200-V MM ESD rating plus –2 V undershoot clamp eliminate need for discrete TVS diodes on each line. |
Use Scenario: Automated test equipment routing multiple DUT signals through shared measurement instrumentation paths. IC Role / Device Role / Timing Role: Reconfigurable analog switch enabling flexible signal path selection without mechanical relays or multiplexers. Use Value: Near-zero propagation delay and flat frequency response up to 500 MHz support accurate high-speed waveform capture and stimulus delivery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT16210DGGR | 12-bit, no BIASV precharge, no active undershoot clamp, higher ron (6–12 Ω). | Lacks live-insertion noise suppression and undershoot protection; requires external biasing for floating nodes. | Choose when higher channel count is needed and hot-swap resilience is not required. |
| SN74CB3Q3257PWR | 4-channel, 2:1 mux, no precharge, no undershoot clamp, lower ron (0.5 Ω), supports 3.3 V only. | Not scalable to 10-bit width; lacks BIASV and active clamp; unsuitable for backplane-level hot-swap. | Choose for compact, low-rdistortion signal routing in non-hot-swap 3.3-V systems with fewer channels. |
Compared with SN74CBTK6800DWR, SN74CBT16210DGGR offers more bits but sacrifices live-insertion robustness, while SN74CB3Q3257PWR delivers lower resistance at the cost of channel count and undershoot protection-making SN74CBTK6800DWR uniquely suited for fault-tolerant modular interconnects.
Availability
SN74CBTK6800DWR is available at Aetrix Electronics and suitable for modular backplane interconnects, memory expansion subsystems, and industrial I/O carrier designs requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for SN74CBTK6800DWR 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 SN74CBTK6800DWR belongs to TI's CBT (Crosspoint Bus Transceiver) family, engineered specifically for hot-swap-capable, low-distortion signal routing in modular computing and industrial control architectures.
FAQ
What is the maximum undershoot voltage the SN74CBTK6800DWR can safely clamp?
The SN74CBTK6800DWR actively clamps I/O undershoots down to –2 V, as verified in the undershoot characteristics table under test conditions with VCC = 5.5 V and BIASV open. This clamping action draws current from VCC to prevent the pass transistor from turning on due to negative transients, ensuring reliable operation during connector mating events. The SN74CBTK6800DWR maintains this protection across its full operating temperature range (–40°C to +85°C).
Does the SN74CBTK6800DWR require external pull-up resistors on the B port during hot-swap?
No, the SN74CBTK6800DWR does not require external pull-up resistors on the B port during hot-swap. When ON is high or VCC = 0 V, the B port is internally precharged to the user-supplied BIASV voltage through an equivalent 10-kΩ resistor. This built-in precharge eliminates floating nodes and associated noise without external components, making the SN74CBTK6800DWR ideal for live-insertion applications where board space and BOM count are critical.
What is the recommended BIASV voltage range for the SN74CBTK6800DWR?
The recommended BIASV voltage range for the SN74CBTK6800DWR is 1.3 V to VCC, as specified in the recommended operating conditions table. For a 5-V system, BIASV may be set to 3.3 V or 5 V depending on the target logic family referenced by the B-side circuitry. Setting BIASV within this range ensures proper precharge behavior and avoids violating absolute maximum ratings (–0.5 V to 7 V). The SN74CBTK6800DWR's internal bias network maintains stable precharge regardless of load capacitance up to 50 pF.
Can the SN74CBTK6800DWR operate with VCC = 3.3 V?
No, the SN74CBTK6800DWR is not rated for 3.3-V operation. Its recommended VCC range is 4 V to 5.5 V, and the absolute maximum rating is 7 V. Operation below 4 V may result in insufficient gate drive for the NMOS pass transistors, increased on-state resistance, unreliable undershoot clamping, and failure to meet TTL-compatible input thresholds. For 3.3-V systems, TI recommends alternatives such as the SN74CB3Q3257PWR, but the SN74CBTK6800DWR must be used strictly within its 4–5.5 V supply window.
How does the SN74CBTK6800DWR achieve latch-up immunity exceeding 100 mA?
The SN74CBTK6800DWR achieves latch-up immunity exceeding 100 mA per JESD 78 Class II through proprietary silicon layout techniques and process enhancements that suppress parasitic SCR formation in the NMOS pass transistor structure. This immunity is validated under worst-case conditions including simultaneous overvoltage on multiple pins and rapid transients. Unlike standard bus switches, the SN74CBTK6800DWR maintains this rating across its full temperature range without derating, making it suitable for mission-critical industrial and telecom applications where latch-up could cause system lockup.
SN74CBTK6800DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTK
- Package/Case:
- 24-SOIC (0.295", 7.50mm 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
SN74CBTK6800DWR FAQ
1.How can I place an order for SN74CBTK6800DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTK6800DWR 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 SN74CBTK6800DWR reliable?
The price and inventory of SN74CBTK6800DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTK6800DWR is usually 5 days.
3.What payment methods are accepted for SN74CBTK6800DWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBTK6800DWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBTK6800DWR?
SN74CBTK6800DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTK6800DWR 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 SN74CBTK6800DWR?
For technical support, including SN74CBTK6800DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTK6800DWR requirements.
6.How does Aetrix verify that SN74CBTK6800DWR is sourced from the original manufacturer or authorized distributors?
All SN74CBTK6800DWR 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 SN74CBTK6800DWR meets industry standards.
7.What is the process for return or replacement of SN74CBTK6800DWR?
All SN74CBTK6800DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTK6800DWR, 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 SN74CBTK6800DWR part is unused and in its original packaging.
Return procedure for SN74CBTK6800DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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