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Texas Instruments SN74CB3Q16811DL
- Part No.:
- SN74CB3Q16811DL
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74CB3Q16811DL.pdf
- Description:
- IC BUS SWITCH 12 X 1:1 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,046
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Product details
Overview
SN74CB3Q16811DL 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 SN74CB3Q16811DL datasheet, SN74CB3Q16811DL pinout, SN74CB3Q16811DL application, or SN74CB3Q16811DL equivalent, key selection criteria include precharge-enabled live-insertion noise suppression, rail-to-rail 0–5-V switching capability, partial-power-down support via Ioff, low propagation delay (0.09–0.15 ns), and dual 12-bit independent enable control (1OE/2OE).
Technical Context
The SN74CB3Q16811DL integrates a charge pump to elevate the gate voltage of its pass transistors, ensuring flat, low ron across the full 0–5-V I/O voltage range - critical for maintaining signal integrity in mixed-voltage digital interfaces. Its B-port precharge circuit applies bias voltage (BIASV) through an internal ~10-kΩ path when OE is high or VCC = 0 V, minimizing glitching during hot-plug events.
It operates as two independent 12-bit switches or one unified 24-bit switch, with separate 1OE and 2OE inputs enabling selective isolation of A/B port pairs. The device meets JESD 78 Class II latch-up immunity (>100 mA) and supports 5-V tolerant I/Os regardless of power state - allowing safe interfacing with legacy 5-V logic even when unpowered.
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 system rails without level-shifting. |
| ron (Typ) | 5 Ω - enables minimal voltage drop and near-zero propagation delay (<0.15 ns) for high-speed data paths. |
| Cio(OFF) (Typ) | 4 pF - reduces capacitive loading on shared buses, preserving signal rise/fall times and timing margins. |
| Ioff (Max) | 1 µA at VCC = 0 V - prevents backflow current during partial power-down, protecting upstream drivers. |
| VI/O Range | 0 V to 5.5 V - supports bidirectional translation between 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, and 5 V logic domains. |
| fOE (Max) | 20 MHz - defines maximum toggle rate for OE control signals in dynamic bus gating applications. |
| tpd (Typ) | 0.09–0.15 ns - measured RC delay based on ron and load capacitance; enables sub-nanosecond timing-critical switching. |
Pinout & Package
SN74CB3Q16811DL uses a 56-pin SSOP (DL) package with 0.5-mm pitch, 13.9–14.1 mm body length, and 6.0–6.2 mm width. Pin 1 is located at top-left corner with index area marking; package height ≤1.2 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Independent output-enable inputs | Active-low controls for two 12-bit switch sections; each enables/disables A↔B connection independently. |
| 1A1–1A12, 2A1–2A12 | A-port data inputs/outputs | Unidirectional or bidirectional data terminals tied to local subsystems (e.g., CPU/memory side). |
| 1B1–1B12, 2B1–2B12 | B-port data inputs/outputs | Unidirectional or bidirectional data terminals connected to hot-pluggable cards or external buses. |
| BIASV | Bias voltage supply input | Reference voltage (0–5 V) applied to precharge B ports during disable/power-down to suppress insertion glitches. |
| VCC | Primary power supply | Supplies internal charge pump and logic; powers switch core; must be stable within 2.3–3.6 V. |
| GND (Pins 7, 18, 30, 43) | Ground reference | Four dedicated ground pins minimize ground bounce and ensure stable ron and timing performance. |
Key Features
| Feature | Design Value |
|---|---|
| Precharged B-port outputs | Internal 10-kΩ-equivalent pull-up to BIASV eliminates signal distortion during live insertion and hot-plug events. |
| Rail-to-rail 0–5-V switching | Supports seamless interface between 1.2-V SoCs and 5-V peripherals without external level shifters or clamping diodes. |
| Low and flat ON-state resistance | ron = 5 Ω typ across full 0–5-V I/O swing ensures consistent timing and minimal IR drop in high-current data bursts. |
| Ioff partial-power-down protection | Blocks reverse current flow when VCC = 0 V, enabling safe operation in systems with staggered power sequencing. |
| Undershoot clamp diodes | Integrated ESD protection on all data/control inputs limits negative transients to –1.8 V, enhancing board-level robustness. |
Applications
| PCI Hot Plug Interface | Memory Interleaving System |
|---|---|
|
Use Scenario: Inserting/removing expansion cards into an active PCI bus without disrupting host operation. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating card-side signals (B ports) from main bus (A ports), with B-port precharge synchronized to BIASV. Use Value: Eliminates insertion-induced bus glitches by holding B ports near receiver threshold voltage, preventing false logic transitions. |
Use Scenario: Dynamically routing address/data between two memory banks in a dual-channel DDR controller. IC Role / Device Role / Timing Role: Low-latency 24-bit signal gate enabling bank-select multiplexing with sub-0.15 ns propagation delay. Use Value: Maintains tight setup/hold timing across memory channels due to flat ron and ultra-low Cio(OFF). |
| Backplane Bus Isolation | Digital Test Access Port (TAP) Multiplexer |
|
Use Scenario: Segregating fault domains on a multi-slot telecom backplane to prevent cascading failures. IC Role / Device Role / Timing Role: High-impedance isolation switch activated by system management controller via 1OE/2OE. Use Value: Achieves >10⁹ Ω off-isolation with <4 pF Cio(OFF), preserving signal integrity and reducing crosstalk between isolated zones. |
Use Scenario: Sharing a single JTAG debugger across multiple ASICs on a test board using time-multiplexed access. IC Role / Device Role / Timing Role: Bidirectional TCK/TMS/TDI/TDO signal router with 5-V tolerance supporting mixed-voltage DUTs. Use Value: Enables direct connection to 5-V legacy devices without level shifters, while consuming only 0.75 mA ICC in active state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDTQS3VH16811 | Pin-compatible but lacks integrated BIASV precharge circuit; requires external bias network for live-insertion support. | Not qualified for PCI Hot Plug without added components; higher design complexity for hot-plug use cases. | Select when cost sensitivity outweighs live-insertion requirements and external biasing is acceptable. |
| SN74CBTLV16212 | Lower ron (3 Ω typ) but no B-port precharge; rated only for 0–3.6-V I/O, not 5-V tolerant. | Unsuitable for 5-V legacy peripheral interfacing or hot-plug scenarios requiring BIASV stabilization. | Prefer for pure 3.3-V high-speed interconnect where 5-V tolerance and precharge are unnecessary. |
Compared with IDTQS3VH16811 and SN74CBTLV16212, the SN74CB3Q16811DL uniquely combines 5-V I/O tolerance, integrated BIASV precharge, and 24-bit dual-enable architecture - making it the only option qualified for PCI Hot Plug without external circuitry.
Availability
SN74CB3Q16811DL is available at Aetrix Electronics and suitable for PCI Hot Plug interfaces, memory interleaving subsystems, and backplane bus isolation requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for SN74CB3Q16811DL 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 SN74CB3Q16811DL belongs to TI's Widebus™ family of high-bandwidth FET bus switches, engineered specifically for low-distortion, rail-to-rail signal gating in broadband communications, networking infrastructure, and data-intensive computing platforms.
FAQ
What is the function of the BIASV pin on the SN74CB3Q16811DL?
The BIASV pin supplies the reference voltage used to precharge the B-port outputs when the device is disabled (OE high) or powered down (VCC = 0 V). This precharge minimizes signal distortion and bus glitches during live insertion or removal of cards. For optimal PCI Hot Plug performance, BIASV should be set to match the input threshold voltage of receivers on the active bus - typically 1.2 V to 2.4 V. The SN74CB3Q16811DL internally connects B ports to BIASV via a ~10-kΩ equivalent resistor path.
Can the SN74CB3Q16811DL operate with VCC = 2.5 V while switching 5-V signals on its I/O ports?
Yes, the SN74CB3Q16811DL supports 0- to 5-V signaling on all data I/Os (A and B ports) when powered at VCC = 2.5 V - confirmed in the datasheet's "Recommended Operating Conditions" and "Electrical Characteristics" tables. Its charge-pump architecture elevates the gate drive voltage to maintain low and flat ron (5 Ω typ) across the full 0–5-V range. This enables direct interfacing between 2.5-V SoCs and 5-V peripherals without external level shifters, a key capability of the SN74CB3Q16811DL.
How does the SN74CB3Q16811DL support partial-power-down operation?
The SN74CB3Q16811DL implements Ioff circuitry that actively disables current paths when VCC = 0 V, limiting reverse current to ≤1 µA per I/O. This prevents damaging backflow from live 5-V buses into unpowered subsystems - essential for systems with staggered power sequencing or hot-swap controllers. Unlike passive switches, the SN74CB3Q16811DL maintains high-impedance isolation even with VCC absent, satisfying JESD78 Class II latch-up requirements and enabling true partial-power-down compliance.
What is the maximum switching frequency supported by the SN74CB3Q16811DL's OE inputs?
The SN74CB3Q16811DL supports a maximum OE switching frequency (fOE) of 20 MHz under recommended conditions (VCC = 3.3 V, RL ≥1 MΩ, CL = 0). This specification reflects the highest reliable toggle rate for enabling/disabling the 24-bit switch sections. At lower VCC (e.g., 2.5 V), fOE remains functional but derates slightly; actual system-level bandwidth is further constrained by load capacitance and ron–Cio(OFF) time constants. The SN74CB3Q16811DL's 0.09–0.15 ns propagation delay ensures minimal latency within this operating envelope.
Does the SN74CB3Q16811DL require external pull-up resistors on its OE pins?
Yes - to guarantee a defined high state during power-up or power-down, OE pins (1OE and 2OE) must be tied to VCC through external pull-up resistors. The minimum value depends on the driving source's current-sinking capability; TI recommends calculating Rpull-up ≤ VCC / IOL of the driver. Without pull-ups, OE may float, causing undefined switch states and potential bus contention. This requirement is explicitly stated in the SN74CB3Q16811DL datasheet's "Application Information" section and applies to all operating modes including partial-power-down.
SN74CB3Q16811DL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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
SN74CB3Q16811DL FAQ
1.How can I place an order for SN74CB3Q16811DL through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3Q16811DL 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 SN74CB3Q16811DL reliable?
The price and inventory of SN74CB3Q16811DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3Q16811DL is usually 5 days.
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SN74CB3Q16811DL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CB3Q16811DL 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 SN74CB3Q16811DL?
For technical support, including SN74CB3Q16811DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3Q16811DL requirements.
6.How does Aetrix verify that SN74CB3Q16811DL is sourced from the original manufacturer or authorized distributors?
All SN74CB3Q16811DL 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 SN74CB3Q16811DL meets industry standards.
7.What is the process for return or replacement of SN74CB3Q16811DL?
All SN74CB3Q16811DL units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3Q16811DL, 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 SN74CB3Q16811DL part is unused and in its original packaging.
Return procedure for SN74CB3Q16811DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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