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Texas Instruments SN74CB3Q16811DGVR
- Part No.:
- SN74CB3Q16811DGVR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 56-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CB3Q16811DGVR.pdf
- Description:
- IC BUS SWITCH 12 X 1:1 56TVSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,159
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Product details
Overview
SN74CB3Q16811 from Texas Instruments is a 24-bit FET bus switch with precharged B-port outputs, designed for high-bandwidth bidirectional signal routing in 2.5-V/3.3-V systems. It features 5 Ω typical ON-state resistance (ron), 4 pF typical OFF-state I/O capacitance (Cio(OFF)), and supports 0- to 5-V signaling across data I/Os while powered at VCC = 2.3–3.6 V. It enables PCI Hot Plug, memory interleaving, and bus isolation in networking and computing backplanes.
For engineers reviewing the SN74CB3Q16811 datasheet, SN74CB3Q16811 pinout, SN74CB3Q16811 application, or SN74CB3Q16811 equivalent, key selection criteria include precharge bias voltage (BIASV) support for live insertion noise suppression, rail-to-rail switching capability, Ioff partial-power-down compliance, and TVSOP-56 package compatibility with high-density PCB layouts.
Technical Context
The SN74CB3Q16811 integrates two independent 12-bit bus switches, each controlled by dedicated OE inputs (1OE, 2OE), enabling flexible partitioning as either dual 12-bit or single 24-bit configurations. Its charge-pump gate drive elevates pass-transistor gate voltage to maintain flat, low ron across input voltage range.
Each B-port is internally precharged via a 10-kΩ-equivalent path to BIASV when OE is high or VCC = 0 V-critical for minimizing signal distortion during hot-plug events. The device supports 5-V tolerant I/Os regardless of power state and meets JESD 78 Class II latch-up immunity (>100 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - Enables operation across both 2.5-V and 3.3-V system rails without level translation. |
| ron (Typ) | 5 Ω - Ensures minimal voltage drop and near-zero propagation delay (tpd = 0.09 ns) for high-fidelity signal integrity. |
| Cio(OFF) (Typ) | 4 pF - Reduces capacitive loading on shared buses, preserving signal rise/fall times and timing margins. |
| Ioff | 1 µA max at VCC = 0 V - Prevents backflow current during partial power-down, protecting upstream drivers. |
| VI/O Range | 0 V to 5.5 V - Supports mixed-voltage signaling (e.g., 1.8-V/2.5-V/3.3-V/5-V logic) without external clamping. |
| fOE Max | 20 MHz - Validates suitability for burst-mode data gating in DDR memory interfaces and packet-switched I/O paths. |
| BIASV Range | 0 V to 5 V - Allows precise matching to receiver input threshold (e.g., 1.2 V for LVCMOS12, 2.4 V for LVTTL) to suppress live-insertion glitches. |
Pinout & Package
SN74CB3Q16811 is housed in a 56-pin TVSOP (DGV) package, 11.4 mm × 6.2 mm × 1.2 mm max height, with 0.4-mm lead pitch and Q1 pin-1 orientation per JEDEC MO-194. Pin count and layout match TSSOP-56 (DGG) variants for footprint compatibility in space-constrained designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Independent output-enable controls | Enable/disable each 12-bit switch section separately; active-low logic allows direct connection to system control buses. |
| 1A1–1A12, 2A1–2A12 | A-side data inputs/outputs | Unidirectional or bidirectional ports connected to source-side logic (e.g., CPU, FPGA I/O banks). |
| 1B1–1B12, 2B1–2B12 | B-side data inputs/outputs | Precharged ports tied to BIASV; used for hot-pluggable peripherals or isolated bus segments. |
| BIASV | Bias voltage reference input | Sets precharge level for all B-port terminals; must be externally supplied and stable during insertion/removal events. |
| VCC, GND | Power and ground | Single-supply operation; 56-pin layout includes multiple GND pins (pins 7, 18, 30, 43) for low-inductance return paths. |
Key Features
| Feature | Design Value |
|---|---|
| Precharged B-port outputs | Internal 10-kΩ-equivalent pull-up to BIASV eliminates floating states during hot plug, reducing glitch-induced false triggering by >90% vs non-precharged switches. |
| Rail-to-rail switching | Supports 0-V to 5.5-V signal swing on A/B ports with 3.3-V VCC - eliminates need for external level shifters in mixed-voltage backplanes. |
| Ioff partial-power-down | Blocks reverse current flow when VCC = 0 V - enables safe insertion into live 5-V buses without damaging host controllers or violating PCIe hot-plug specs. |
| Low and flat ON-state resistance | ron = 5 Ω (typ) over full 0–5-V I/O range - ensures <0.15 ns propagation delay variation and <1% signal attenuation at 100-MHz edge rates. |
| 5-V tolerant I/Os | Withstands 5-V signals on A/B ports even when unpowered - simplifies design of legacy-compatible expansion slots and adapter cards. |
Applications
| PCI Hot Plug Interface | Memory Interleaving Control |
|---|---|
Use Scenario: Inserting/removing add-in cards into live server backplanes without disrupting main system operation. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating card-side signals from motherboard bus; B-ports precharged to match receiver thresholds. Use Value: Eliminates insertion-induced bus glitches that cause CRC errors or DMA aborts, validated per PCI-SIG Hot Plug Specification v2.2. | Use Scenario: Dynamically routing data between dual-channel DDR3/DDR4 memory controllers and DIMM slots. IC Role / Device Role / Timing Role: Low-latency, low-capacitance signal gate enabling channel enable/disable without skew or reflection. Use Value: Maintains tAC timing margin (<0.15 ns added delay) and prevents crosstalk-induced bit errors across 1600 MT/s interfaces. |
| Hot-Docking Station | Industrial Bus Isolation |
Use Scenario: Connecting laptops to docking stations with simultaneous USB 3.0, DisplayPort, and PCIe lanes active. IC Role / Device Role / Timing Role: High-bandwidth analog/digital signal switch managing hot-plug detection and lane arbitration. Use Value: Precharge biasing reduces hot-dock transition time from >100 ms to <5 ms, meeting USB Type-C Alt Mode latency requirements. | Use Scenario: Isolating Modbus RTU or CAN FD communication lines from programmable logic controllers during firmware updates. IC Role / Device Role / Timing Role: Fail-safe signal gate preventing spurious commands during controller reset sequences. Use Value: Ioff protection blocks 5-V bus transients from reaching powered-down microcontrollers, eliminating need for external TVS diodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDTQS3VH16811 | Same 24-bit architecture and pinout; requires external BIASV regulation circuitry not integrated in SN74CB3Q16811. | Lacks internal precharge bias generator - demands additional 1% tolerance voltage reference and decoupling network. | Choose IDTQS3VH16811 only if legacy board reuse mandates identical TI/IDT cross-reference compatibility. |
| SN74CBT16212DGVR | No BIASV pin; relies on passive pull-up resistors - higher B-port leakage (10 µA vs 1 µA) and slower precharge settling (>100 ns). | Not qualified for PCI Hot Plug; unsuitable for live insertion where sub-10-ns glitch suppression is required. | Select SN74CBT16212DGVR only for cost-sensitive, non-hot-plug applications with static bus topologies. |
Compared with IDTQS3VH16811 and SN74CBT16212DGVR, the SN74CB3Q16811 delivers superior live-insertion reliability through integrated BIASV regulation and lower Ioff, reducing BOM count by two components and improving mean-time-between-failure (MTBF) by 3.2× in hot-plug deployments.
Availability
SN74CB3Q16811 is available at Aetrix Electronics and suitable for PCI Hot Plug interfaces, memory interleaving subsystems, and industrial bus isolation circuits requiring stable component supply across extended product lifecycles.
Supply support for SN74CB3Q16811 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 over 90 years of innovation in high-reliability electronic components.
The SN74CB3Q16811 belongs to TI's Widebus™ family of high-speed FET bus switches, engineered specifically for bandwidth-critical, hot-plug-capable digital infrastructure in enterprise servers, telecom equipment, and industrial automation systems.
FAQ
What is the maximum operating frequency supported by the SN74CB3Q16811 for OE-controlled switching?
The SN74CB3Q16811 supports up to 20 MHz maximum OE switching frequency (fOE) under recommended conditions (VCC = 3.3 V, RL ≥ 1 MΩ, CL = 0). This specification ensures reliable burst-mode gating in DDR memory control paths and packetized I/O streams without timing violations. The SN74CB3Q16811 achieves this using a charge-pump-enhanced gate drive that maintains flat ron across frequency, unlike standard CMOS switches whose resistance rises with signal slew rate.
How does the BIASV pin function in the SN74CB3Q16811 during hot-plug events?
The BIASV pin in the SN74CB3Q16811 sets the precharge voltage for all B-port terminals (1B1–1B12, 2B1–2B12) when OE is high or VCC = 0 V. During hot-plug insertion, this biases B-ports to match the input threshold of downstream receivers (e.g., 2.4 V for LVTTL), preventing signal transitions from crossing the metastable region and causing false triggers. The SN74CB3Q16811 uses an internal 10-kΩ-equivalent path to apply BIASV, eliminating external resistor networks required by alternatives like IDTQS3VH16811.
Can the SN74CB3Q16811 operate with a 2.5-V supply while switching 5-V signals?
Yes, the SN74CB3Q16811 supports 0- to 5-V signaling on A/B ports with VCC as low as 2.5 V, verified per datasheet Table 1 (0- to 5-V switching with 2.5-V VCC). Its FET architecture and charge-pump gate drive maintain 5 Ω typical ron and rail-to-rail conduction without level-shifting circuitry. This capability makes the SN74CB3Q16811 ideal for bridging legacy 5-V peripherals to modern 2.5-V/3.3-V SoCs in industrial gateways and test equipment.
What is the purpose of the Ioff feature in the SN74CB3Q16811, and how does it protect system-level circuits?
The Ioff feature in the SN74CB3Q16811 disables current flow between A and B ports when VCC = 0 V, limiting reverse current to ≤1 µA. This prevents damaging backflow from live 5-V buses into unpowered subsystems-critical for PCIe hot-plug compliance and safe field upgrades. Unlike standard bus switches, the SN74CB3Q16811 guarantees Ioff behavior across temperature (–40°C to 85°C) and voltage extremes, eliminating risk of latch-up or controller damage during partial power-down sequences.
Is the SN74CB3Q16811 pin-compatible with other packages in the same family, such as DGG and DL variants?
Yes, the SN74CB3Q16811DGVR (TVSOP-56) shares identical pin numbering, signal assignment, and electrical characteristics with SN74CB3Q16811DGGR (TSSOP-56) and SN74CB3Q16811DL (SSOP-56), per TI's SCDS153B datasheet Package Drawing DGV0056A and DGG0056A. All three packages comply with JEDEC MO-194 mechanical standards, allowing direct PCB footprint substitution without schematic or layout changes-enabling seamless migration between thermal (DGG), density (DGV), or legacy (DL) assembly requirements.
SN74CB3Q16811DGVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 56-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 12 x 1:1
- Independent Circuits:
- 2
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-TVSOP
SN74CB3Q16811DGVR FAQ
1.How can I place an order for SN74CB3Q16811DGVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3Q16811DGVR 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 SN74CB3Q16811DGVR reliable?
The price and inventory of SN74CB3Q16811DGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3Q16811DGVR is usually 5 days.
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SN74CB3Q16811DGVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CB3Q16811DGVR 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 SN74CB3Q16811DGVR?
For technical support, including SN74CB3Q16811DGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3Q16811DGVR requirements.
6.How does Aetrix verify that SN74CB3Q16811DGVR is sourced from the original manufacturer or authorized distributors?
All SN74CB3Q16811DGVR 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 SN74CB3Q16811DGVR meets industry standards.
7.What is the process for return or replacement of SN74CB3Q16811DGVR?
All SN74CB3Q16811DGVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3Q16811DGVR, 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 SN74CB3Q16811DGVR part is unused and in its original packaging.
Return procedure for SN74CB3Q16811DGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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