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Texas Instruments SN74CB3Q16811DLR
- Part No.:
- SN74CB3Q16811DLR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74CB3Q16811DLR.pdf
- Description:
- IC BUS SWITCH 12 X 1:1 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,221
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Product details
Overview
SN74CB3Q16811DLR 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 rail-to-rail switching and live insertion in PCI Hot Plug applications.
For engineers reviewing the SN74CB3Q16811DLR datasheet, SN74CB3Q16811DLR pinout, SN74CB3Q16811DLR application, or SN74CB3Q16811DLR equivalent, key selection criteria include precharge bias voltage (BIASV) support, Ioff partial-power-down capability, 56-pin TSSOP package compatibility, and verified 20 MHz OE switching frequency under 3.3-V operation.
Technical Context
The SN74CB3Q16811DLR implements two independent 12-bit FET bus switches, each controlled by dedicated OE inputs (1OE, 2OE). Its internal charge pump elevates gate voltage to maintain flat, low ron across input voltage range - enabling near-zero propagation delay (tpd = 0.09–0.15 ns) and rail-to-rail signal integrity from 0 V to 5.5 V on A/B ports.
When OE is high, B-port terminals are actively precharged to BIASV via ~10-kΩ equivalent resistors - minimizing live-insertion glitches by holding outputs near receiver threshold. The device supports 5-V tolerant I/Os regardless of VCC state (powered up/down), 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 - ensures compatibility with both 2.5-V and 3.3-V logic domains without level shifters. |
| ron (Typ) | 5 Ω - enables minimal voltage drop and signal distortion during high-current bidirectional data flow. |
| Cio(OFF) (Typ) | 4 pF - reduces capacitive loading on shared buses, preserving signal rise/fall times and timing margins. |
| VI/O Range | 0 V to 5.5 V - allows interoperability with legacy 5-V peripherals while operating from low-voltage supply. |
| fOE (Max) | 20 MHz - supports high-speed enable/disable control for dynamic bus isolation in real-time systems. |
| Ioff (Max) | 1 µA at VCC = 0 V - prevents backflow current during partial power-down, protecting upstream drivers. |
| tpd | 0.09–0.15 ns - delivers sub-nanosecond propagation delay critical for high-frequency memory interleaving and bus gating. |
Pinout & Package
TSSOP-56 (DGG) package: 13.9 mm × 6.0 mm × 1.2 mm max height, lead pitch 0.5 mm, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Independent output-enable inputs | Active-low control per 12-bit section; must be pulled up to VCC for defined power-up state. |
| 1A1–1A12, 2A1–2A12 | A-side data inputs/outputs | Bidirectional ports connected to local subsystem (e.g., CPU/memory interface); tolerate 0–5.5 V. |
| 1B1–1B12, 2B1–2B12 | B-side data inputs/outputs | Bidirectional ports connected to hot-pluggable card/bus; precharged to BIASV when OE = high. |
| BIASV | Bias voltage reference input | Configures precharge level (0–5 V) to match receiver threshold on active bus - suppresses live-insertion glitches. |
| VCC, GND | Power and ground | Single 2.3–3.6 V supply; 56-pin layout includes multiple GND pins for low-inductance return paths. |
Key Features
| Feature | Design Value |
|---|---|
| Precharged B-port outputs | Reduces live-insertion noise by holding B-side terminals at BIASV during hot-plug events - eliminates threshold-crossing glitches. |
| Ioff partial-power-down | Blocks current backflow when VCC = 0 V, enabling safe integration into systems with staggered power sequencing. |
| 5-V tolerant I/Os | Supports mixed-voltage interconnects without external translators - simplifies design for legacy peripheral integration. |
| Low and flat ron | 5 Ω typical across full VI/O range ensures consistent signal attenuation and timing behavior for analog/digital signals. |
| Rail-to-rail switching | Operates from 0 V to 5.5 V on all data I/Os - preserves full logic swing and analog signal fidelity in wide-range applications. |
Applications
| PCI Hot Plug Interface | Memory Interleaving System |
|---|---|
|
Use Scenario: Inserting/removing expansion cards into live PCI backplanes without disrupting system operation. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating card-side signals from main bus; B-ports precharged to BIASV matching host receiver thresholds. Use Value: Eliminates bus glitches during hot-plug events by preventing B-port voltage transients from crossing input threshold regions. |
Use Scenario: Dynamically routing data between dual-channel DDR memory controllers and shared memory banks. IC Role / Device Role / Timing Role: Low-latency 24-bit switch enabling time-multiplexed access to interleaved memory banks with sub-0.15 ns propagation delay. Use Value: Maintains tight timing margins through flat 5 Ω ron and 4 pF Cio(OFF), avoiding skew-induced read/write errors. |
| Hot-Docking Station | Bus Isolation in Industrial Controller |
|
Use Scenario: Connecting laptop docking stations with active USB/PCIe peripherals while host remains powered. IC Role / Device Role / Timing Role: Signal gate controlling data path between dock and host; supports 0–5-V signaling for mixed-interface compatibility. Use Value: Enables seamless handover using Ioff protection and 5-V tolerance - no level shifters needed for legacy peripheral support. |
Use Scenario: Isolating fieldbus (e.g., CAN, RS-485) transceivers from processor bus during firmware updates or fault conditions. IC Role / Device Role / Timing Role: High-impedance break-before-make switch decoupling noisy industrial interfaces from sensitive MCU I/Os. Use Value: Prevents corruption via 1 µA Ioff leakage and 100 mA latch-up immunity - ensures deterministic reset behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDTQS3VH16811PGG | Same 24-bit architecture and precharge function; requires external BIASV resistor network; higher ron (6.5 Ω typ). | Valid for PCI Hot Plug but lacks integrated charge pump - slightly degraded rail-to-rail performance at 2.5 V. | Choose when footprint compatibility with older IDT designs is required and marginal ron increase is acceptable. |
| SN74CBTLV16212DGGR | No BIASV pin or precharge; lower ron (3 Ω typ); only 3.3-V compatible (no 2.5-V min); no 5-V tolerance in powered-down state. | Suitable for fixed-voltage, non-hot-plug systems where lowest possible ron and cost are prioritized over live-insertion robustness. | Choose for static backplane routing where precharge and 5-V tolerance are unnecessary and tighter ron is critical. |
Compared with IDTQS3VH16811PGG and SN74CBTLV16212DGGR, the SN74CB3Q16811DLR uniquely combines integrated charge pump, programmable BIASV, and guaranteed 5-V I/O tolerance during power-down - making it the only option qualified for PCI Hot Plug compliance with zero external bias components.
Availability
SN74CB3Q16811DLR is available at Aetrix Electronics and suitable for PCI Hot Plug interfaces, memory interleaving systems, hot-docking stations, and industrial bus isolation requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for SN74CB3Q16811DLR 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 SN74CB3Q16811DLR belongs to TI's Widebus™ family of FET bus switches, engineered specifically for high-bandwidth, low-distortion signal gating in computing, communications, and hot-plug infrastructure.
FAQ
What is the maximum operating frequency supported by the SN74CB3Q16811DLR?
The SN74CB3Q16811DLR supports a maximum OE switching frequency of 20 MHz under recommended conditions (VCC = 3.3 V, TA = 25°C). This rating applies to the enable/disable control signal - not data throughput - and reflects the device's ability to rapidly isolate or connect 24-bit data paths without introducing timing violations in high-speed bus architectures.
Does the SN74CB3Q16811DLR require external components for BIASV configuration?
No, the SN74CB3Q16811DLR does not require external components to set BIASV. The BIASV pin accepts a DC voltage (0–5 V) directly - typically tied to VCC or a mid-rail reference - to configure precharge level. Unlike alternatives such as IDTQS3VH16811, it integrates the precharge circuitry and needs no external resistors or charge pumps.
Can the SN74CB3Q16811DLR operate safely when VCC is 0 V?
Yes, the SN74CB3Q16811DLR supports partial-power-down operation: when VCC = 0 V, its Ioff circuitry limits leakage current to ≤1 µA, and 5-V tolerant I/Os remain protected. B-ports stay precharged to the applied BIASV voltage, maintaining high-impedance isolation without damaging upstream drivers or violating bus specifications.
What package type is used for the SN74CB3Q16811DLR?
The SN74CB3Q16811DLR uses a 56-pin TSSOP package (TI package code DGG), measuring 13.9 mm × 6.0 mm × 1.2 mm max height with 0.5 mm lead pitch. It is RoHS-compliant, has NiPdAu lead finish, and carries MSL Level-1 rating for unlimited floor life at ≤30°C/60% RH.
How does the SN74CB3Q16811DLR differ from standard CMOS analog switches?
The SN74CB3Q16811DLR differs from general-purpose CMOS analog switches by integrating a charge pump for gate voltage boosting - delivering flat 5 Ω ron across 0–5.5 V I/O range, sub-0.15 ns propagation delay, and active B-port precharge. These features are optimized for high-speed digital bus gating, not general analog signal routing, and meet PCI Hot Plug electrical requirements out-of-the-box.
SN74CB3Q16811DLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-SSOP
SN74CB3Q16811DLR FAQ
1.How can I place an order for SN74CB3Q16811DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3Q16811DLR 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 SN74CB3Q16811DLR reliable?
The price and inventory of SN74CB3Q16811DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3Q16811DLR is usually 5 days.
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Once your SN74CB3Q16811DLR 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 SN74CB3Q16811DLR?
For technical support, including SN74CB3Q16811DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3Q16811DLR requirements.
6.How does Aetrix verify that SN74CB3Q16811DLR is sourced from the original manufacturer or authorized distributors?
All SN74CB3Q16811DLR 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 SN74CB3Q16811DLR meets industry standards.
7.What is the process for return or replacement of SN74CB3Q16811DLR?
All SN74CB3Q16811DLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3Q16811DLR, 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 SN74CB3Q16811DLR part is unused and in its original packaging.
Return procedure for SN74CB3Q16811DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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