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Texas Instruments SN74CBT16811CDL
- Part No.:
- SN74CBT16811CDL
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBT16811CDL.pdf
- Description:
- IC BUS SWITCH 12 X 1:1 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:13,120
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Product details
Overview
SN74CBT16811CDL from Texas Instruments is a 24-bit FET bus switch organized as two independent 12-bit bidirectional switches, featuring 3 Ω typical ON-state resistance, −2 V undershoot protection on A/B ports, B-port precharge via user-selectable BIASV, and support for 0–5-V signaling across mixed-voltage systems including PCI hot-plug interfaces.
For engineers reviewing the SN74CBT16811CDL datasheet, SN74CBT16811CDL pinout, SN74CBT16811CDL application, or SN74CBT16811CDL equivalent, key selection criteria include live-insertion noise suppression, partial-power-down (Ioff) capability, low propagation delay (<0.24 ns), 5.5 pF typical OFF-state I/O capacitance, and compatibility with TTL/3.3-V/5-V control inputs.
Technical Context
The SN74CBT16811CDL implements dual 12-bit FET-based analog/digital bus switches with independent OE control (1OE, 2OE), enabling either two isolated 12-bit paths or one consolidated 24-bit path. Each switch channel provides near-zero propagation delay via low-ron FET architecture and active undershoot-protection circuitry that maintains OFF-state integrity during −2 V transients.
B-port terminals are internally precharged to BIASV through a 10-kΩ equivalent resistor when OE is high or VCC = 0 V, minimizing signal distortion during hot-plug events. The device supports partial-power-down operation via Ioff, preventing backflow current when VCC = 0 V while maintaining isolation between A and B ports.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ON-state resistance (ron) | 3 Ω typical - enables minimal voltage drop and signal attenuation in high-speed data paths |
| Propagation delay (tpd) | 0.24 ns at VCC = 4 V - preserves timing integrity in sub-nanosecond digital interfaces |
| I/O capacitance (Cio(OFF)) | 5.5 pF typical - reduces capacitive loading and signal distortion on driven buses |
| Undershoot protection | −2 V on A/B ports - prevents false switching and latch-up during transient negative excursions |
| BIASV range | 0 V to VCC - allows bias matching to receiver input thresholds for live-insertion noise suppression |
| Ioff current | 10 µA max at VCC = 0 V - ensures safe isolation and zero backfeed current during power-down |
| VCC operating range | 4 V to 5.5 V - supports robust operation across industrial-grade 5-V supply tolerances |
| Signal voltage range | 0 V to 5.5 V on I/O - interoperates with 0.8-V to 5-V logic families without level shifters |
Pinout & Package
SN74CBT16811CDL is housed in a 56-pin SSOP (DL) package with 0.5-mm pitch, 13.9–14.1 mm body length, and 7.9–8.3 mm body width. Pin 1 is located at top-left corner with quadrants defined per JEDEC MO-153.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A12, 2A1–2A12 | A-side data I/O | Input/output terminals for first and second 12-bit bus segments; bidirectional when switch enabled |
| 1B1–1B12, 2B1–2B12 | B-side data I/O | Corresponding B-port terminals; precharged to BIASV during OE high or power-down |
| 1OE, 2OE | Output-enable control | Active-low enables respective 12-bit switch; must be pulled up to VCC for power-up safety |
| BIASV | Bias supply input | User-supplied voltage (0–VCC) setting precharge level for B-port live-insertion noise mitigation |
| VCC, GND | Power and ground | Single 4–5.5 V supply; multiple GND pins ensure low-impedance return paths for all 24 channels |
Key Features
| Feature | Design Value |
|---|---|
| B-port precharge to BIASV | Reduces live-insertion glitches by holding B-port near receiver threshold voltage before contact |
| Undershoot protection (−2 V) | Maintains OFF-state integrity during negative transients without external clamping diodes |
| Partial-power-down (Ioff) | Blocks current flow between A/B ports when VCC = 0 V, enabling safe system-level power sequencing |
| Low 5.5-pF OFF-state capacitance | Minimizes bus loading and crosstalk in high-density, multi-drop interconnects |
| TTL/CMOS-compatible control | Accepts 0.8-V to 5-V logic levels on OE inputs, simplifying interface with mixed-voltage controllers |
Applications
| PCI Hot-Plug Interface | Memory Interleaving Bus |
|---|---|
Use Scenario: Inserting/removing expansion 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; BIASV set to match PCI receiver threshold (~1.4 V). Use Value: Eliminates insertion-induced glitches by precharging B-port to threshold voltage, ensuring no crossing of receiver decision region. | Use Scenario: Dynamically routing data between two memory banks sharing a common controller bus. IC Role / Device Role / Timing Role: Low-latency, low-distortion 24-bit signal gate enabling bank-select multiplexing without added propagation delay. Use Value: 0.24 ns tpd and 3 Ω ron preserve setup/hold timing margins and minimize voltage drop across memory address/data lines. |
| Low-Distortion Signal Gating | Multi-Voltage System Isolation |
Use Scenario: Enabling/disabling analog or digital signal paths in test equipment where signal fidelity is critical. IC Role / Device Role / Timing Role: Analog-capable FET switch providing near-ideal ON-resistance and minimal charge injection. Use Value: 5.5 pF Cio(OFF) and rail-to-rail 0–5.5 V I/O range maintain signal integrity for DC-coupled analog waveforms and high-speed digital edges. | Use Scenario: Interfacing 1.8-V FPGA I/O with 3.3-V peripheral bus while maintaining voltage domain separation. IC Role / Device Role / Timing Role: Level-agnostic bidirectional switch allowing voltage translation-free communication between mixed-supply domains. Use Value: Supports 0–5.5 V signaling on all I/Os without external level shifters, reducing BOM count and layout complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD16210DL | Higher 6 Ω ron, includes 3-state control, no BIASV precharge | Lacks live-insertion noise suppression; suited for static bus isolation only | Choose when lower cost and 3-state output are prioritized over hot-plug reliability |
| SN74CB3Q3245PWR | 8-bit configuration, 4 Ω ron, supports 1.65–5.5 V VCC, no undershoot protection | Smaller channel count; requires external clamping for −2 V transients | Choose for space-constrained designs needing fewer channels and wider VCC range |
Compared with SN74CBT16811CDL, SN74CBTD16210DL trades live-insertion robustness for 3-state flexibility, while SN74CB3Q3245PWR offers broader VCC compatibility but lacks integrated undershoot protection and BIASV precharge-making SN74CBT16811CDL uniquely suited for PCI hot-plug and mixed-voltage live-insertion systems.
Availability
SN74CBT16811CDL is available at Aetrix Electronics and suitable for PCI hot-plug interfaces, memory interleaving architectures, and multi-voltage system isolation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SN74CBT16811CDL 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 logic solutions, with decades of expertise in high-speed interface and power management ICs.
The SN74CBT16811CDL belongs to TI's Widebus™ family of high-speed FET bus switches, designed specifically for low-distortion, low-latency signal gating in live-insertion and mixed-voltage digital systems.
FAQ
What is the maximum undershoot voltage the SN74CBT16811CDL can withstand on its A and B ports?
The SN74CBT16811CDL provides active undershoot protection up to −2 V on both A and B ports, as verified in the absolute maximum ratings and functional specifications of the official datasheet. This protection operates independently of VCC and remains effective even during power-down states. The SN74CBT16811CDL uses internal sensing circuitry to maintain OFF-state integrity during such transients, eliminating the need for external clamping diodes in most PCI and hot-plug applications.
How does the BIASV pin function in the SN74CBT16811CDL, and what voltage range is supported?
The BIASV pin on the SN74CBT16811CDL supplies a user-selectable bias voltage used to precharge all B-port terminals through an internal ~10-kΩ equivalent resistor when OE is high or VCC = 0 V. It accepts voltages from 0 V to VCC (4–5.5 V), enabling precise alignment with receiver input thresholds-critical for minimizing live-insertion noise. The SN74CBT16811CDL datasheet confirms BIASV functionality across the full recommended operating range and specifies VO(BIAS) accuracy as Vx ± 0.1 V under load.
Does the SN74CBT16811CDL support partial-power-down operation, and how is it implemented?
Yes, the SN74CBT16811CDL supports partial-power-down via its Ioff feature, which limits current to 10 µA max when VCC = 0 V and I/O voltages range from 0 to 5.5 V. This prevents damaging backflow current between powered and unpowered sections of a system. The SN74CBT16811CDL achieves this through internal circuitry that disables conduction paths while maintaining high-impedance isolation-verified per JESD 78 Class II latch-up testing and explicitly documented in the recommended operating conditions table.
What is the typical ON-state resistance (ron) of the SN74CBT16811CDL, and how does it vary with operating conditions?
The SN74CBT16811CDL has a typical ON-state resistance of 3 Ω at VCC = 4.5 V, VI = 0 V, and IO = 30 mA, with a maximum of 6 Ω across the full operating range. At VCC = 4 V and IO = 64 mA, ron remains ≤12 Ω. This low, consistent ron ensures minimal signal attenuation and voltage drop in high-speed data paths. All ron values for the SN74CBT16811CDL are measured differentially between A and B terminals under specified load conditions and published in the electrical characteristics table.
Can the SN74CBT16811CDL be used in analog signal routing applications, and what parameters support this use case?
Yes, the SN74CBT16811CDL is qualified for analog signal routing due to its rail-to-rail 0–5.5 V I/O voltage range, low 5.5 pF OFF-state capacitance, 3 Ω typical ron, and absence of significant charge injection or THD degradation. Its FET-switch architecture provides symmetrical conduction and low distortion-confirmed by application notes on low-distortion signal gating. The SN74CBT16811CDL datasheet explicitly lists "analog applications" in its scope and characterizes Cio(OFF), ron, and VI/O ranges under conditions relevant to analog signal integrity.
SN74CBT16811CDL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Bus Switch
- Circuit:
- 12 x 1:1
- Independent Circuits:
- 2
- 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:
- 56-SSOP
SN74CBT16811CDL FAQ
1.How can I place an order for SN74CBT16811CDL through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT16811CDL 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 SN74CBT16811CDL reliable?
The price and inventory of SN74CBT16811CDL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT16811CDL is usually 5 days.
3.What payment methods are accepted for SN74CBT16811CDL?
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4.How is shipping managed for SN74CBT16811CDL?
SN74CBT16811CDL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT16811CDL 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 SN74CBT16811CDL?
For technical support, including SN74CBT16811CDL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT16811CDL requirements.
6.How does Aetrix verify that SN74CBT16811CDL is sourced from the original manufacturer or authorized distributors?
All SN74CBT16811CDL 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 SN74CBT16811CDL meets industry standards.
7.What is the process for return or replacement of SN74CBT16811CDL?
All SN74CBT16811CDL units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT16811CDL, 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 SN74CBT16811CDL part is unused and in its original packaging.
Return procedure for SN74CBT16811CDL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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