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Texas Instruments SN74CB3Q6800DBQR
- Part No.:
- SN74CB3Q6800DBQR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SN74CB3Q6800DBQR.pdf
- Description:
- IC BUS SW 10 X 1:1 24SSOP/QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,414
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Product details
Overview
SN74CB3Q6800DBQR from Texas Instruments is a 10-bit FET bus switch with precharged B-port outputs, designed for high-bandwidth bidirectional signal routing in 2.3–3.6 V systems. It delivers 4.5 Ω typical ON-state resistance, <0.225 ns propagation delay, 500 MHz bandwidth support, and 5-V tolerant I/Os-enabling low-distortion PCI interface and hot-plug applications.
For engineers reviewing the SN74CB3Q6800DBQR datasheet, SN74CB3Q6800DBQR pinout, SN74CB3Q6800DBQR application, or SN74CB3Q6800DBQR equivalent, key selection considerations include precharge-enabled live-insertion noise suppression, rail-to-rail switching across 0–5 V signaling levels, partial-power-down (Ioff) capability, and SSOP-24 package compatibility with space-constrained board layouts.
Technical Context
The SN74CB3Q6800DBQR integrates a charge-pump circuit to elevate gate voltage of pass transistors, ensuring flat, low ron (4.5 Ω typ) across input voltages from 0 V to 5.5 V. Its internal bias voltage (BIASV) precharges B-port outputs to minimize signal distortion during card insertion/removal.
Control logic uses a single active-low ON input to enable bidirectional A↔B conduction; when disabled, B ports are pulled to BIASV via ~10-kΩ equivalent resistance while A ports enter high-Z. The device supports TTL- and CMOS-compatible control inputs and features undershoot clamp diodes on all data and control pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - Enables interoperability with both 2.5 V and 3.3 V logic domains without level shifters. |
| ron (Typ) | 4.5 Ω - Ensures minimal voltage drop and near-zero propagation delay (<0.225 ns) under 30 mA load. |
| Bandwidth | Up to 500 MHz - Supports high-speed differential signaling, memory interleaving, and broadband data paths. |
| I/O Voltage Range | 0 V to 5.5 V - Allows seamless interfacing between mixed-voltage systems (e.g., 3.3 V core ↔ 5 V peripheral). |
| Cio(OFF) | 3.5 pF typ - Reduces capacitive loading on inactive buses, preserving signal integrity in dense routing environments. |
| Ioff Current | 1 µA max at VCC = 0 V - Prevents backflow current and enables safe partial-power-down operation during system sleep states. |
| BIASV Range | 0 V to 5 V - Configurable bias point aligns with receiver threshold to suppress live-insertion glitches in hot-plug systems. |
Pinout & Package
SN74CB3Q6800DBQR is housed in a 24-pin SSOP (DBQ) package measuring 7.9 mm × 4.5 mm × 1.2 mm (max height), RoHS-compliant with NiPdAu lead finish and MSL Level-2-260°C-1 year rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A10 | Data input/output (A-side) | Bidirectional signal path; connects to B1–B10 when ON = L; high-Z when ON = H. |
| B1–B10 | Data input/output (B-side) | Bidirectional path; precharged to BIASV when ON = H to avoid threshold-crossing glitches. |
| ON | Active-low enable | Drives internal switch array; must be pulled up to VCC during power-up/down to ensure defined high-Z state. |
| GND | Ground reference | Common return for VCC, BIASV, and all I/O; decoupling capacitor required near pin 11. |
| VCC | Supply voltage | Power source for charge pump and control logic; operates from 2.3 V to 3.6 V. |
| BIASV | Bias supply input | Reference voltage applied to B-port precharge network; set to match receiver input threshold (e.g., 1.2 V or 2.4 V). |
Key Features
| Feature | Design Value |
|---|---|
| Precharged B-port outputs | Reduces live-insertion noise by holding B outputs at BIASV, preventing glitch-induced false triggering in hot-plug PCIe/PCI slots. |
| 5-V tolerant I/Os | Enables direct connection to legacy 5 V peripherals without external level translators, even when VCC = 2.5 V or 3.3 V. |
| Charge-pump enhanced ron | Maintains 4.5 Ω typical ON-resistance across full 0–5.5 V I/O swing, eliminating ron variation-induced timing skew. |
| Undershoot clamp diodes | Protects inputs from negative transients down to –1.8 V, improving robustness in noisy industrial or telecom backplane environments. |
| Partial-power-down support | Ioff leakage ≤1 µA at VCC = 0 V isolates powered-down sections, enabling selective subsystem shutdown in multi-rail embedded systems. |
Applications
| PCI Hot-Plug Interface | Differential Signal Routing |
|---|---|
Use Scenario: Inserting/removing expansion cards into live PCI/PCIe backplanes without disrupting bus operation. IC Role / Device Role / Timing Role: Bidirectional bus switch with B-port precharge aligned to receiver threshold voltage to suppress insertion transients. Use Value: Eliminates false triggering caused by card parasitic capacitance pulling bus lines below input threshold during mating. | Use Scenario: Routing high-frequency differential pairs (e.g., LVDS, RSDS) between FPGA and serializer/deserializer ICs. IC Role / Device Role / Timing Role: Low-capacitance (3.5 pF OFF), low-ron (4.5 Ω) analog switch preserving signal edge fidelity and minimizing jitter accumulation. Use Value: Maintains >500 MHz bandwidth and sub-0.225 ns propagation delay, critical for maintaining eye diagram integrity in 1+ Gbps links. |
| Memory Interleaving Control | Bus Isolation in Multi-Supply Systems |
Use Scenario: Dynamically connecting/disconnecting DDR2/DDR3 memory banks to reduce active bus capacitance and improve timing margin. IC Role / Device Role / Timing Role: 10-bit parallel switch enabling fast, synchronous bank isolation with rail-to-rail 0–5 V signal handling. Use Value: Flat ron ensures uniform delay across all 10 bits, avoiding skew-induced setup/hold violations in high-speed memory controllers. | Use Scenario: Isolating 3.3 V processor domain from 5 V sensor interface while maintaining shared data bus integrity. IC Role / Device Role / Timing Role: Level-agnostic bidirectional bridge supporting simultaneous 2.5 V, 3.3 V, and 5 V signaling without external translation. Use Value: 5-V tolerant I/Os and 2.3–3.6 V VCC range allow direct integration into mixed-supply industrial control and automotive gateway designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT6800DBQR | No BIASV pin; lacks precharged output feature; higher ron (6 Ω typ); no Ioff support. | Not suitable for live-insertion or partial-power-down use cases; limited to static bus isolation. | Select only if precharge and power-down safety are unnecessary and cost is primary constraint. |
| SN74LVC1G3157DCKR | Single-channel SPDT switch; no BIASV; 5-V tolerant; ron = 5 Ω typ; no 10-bit parallel interface. | Requires 10 discrete devices to match channel count; increases board area and layout complexity. | Use only for low-channel-count prototyping where density and integration are secondary to part availability. |
Compared with SN74CBT6800DBQR and SN74LVC1G3157DCKR, the SN74CB3Q6800DBQR uniquely combines 10-bit integration, BIASV-controlled precharge, Ioff-enabled power-down safety, and sub-5 Ω ron-making it the sole choice for PCI hot-plug, memory interleaving, and mixed-voltage bus gating where signal integrity and system-level reliability are non-negotiable.
Availability
SN74CB3Q6800DBQR is available at Aetrix Electronics and suitable for PCI interface design, high-speed memory subsystems, and industrial hot-plug systems requiring stable component supply across extended production lifecycles.
Supply support for SN74CB3Q6800DBQR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The SN74CB3Q6800DBQR belongs to TI's CB3Q family of high-bandwidth FET bus switches, engineered specifically for low-distortion, rail-to-rail signal gating in live-insertion and mixed-voltage computing infrastructure.
FAQ
What is the maximum operating frequency supported by the SN74CB3Q6800DBQR?
The SN74CB3Q6800DBQR supports a maximum switching frequency of 20 MHz on its ON control input and delivers up to 500 MHz bandwidth on its data path. This performance is enabled by its charge-pump architecture and low 3.5 pF OFF-state capacitance, making SN74CB3Q6800DBQR suitable for high-speed bus isolation and memory interleaving applications where signal integrity is critical.
How does the BIASV pin function in the SN74CB3Q6800DBQR?
The BIASV pin on the SN74CB3Q6800DBQR supplies a user-defined bias voltage (0–5 V) that precharges the B-port outputs when the device is disabled (ON = high) or powered down (VCC = 0 V). This precharge prevents live-insertion glitches from crossing receiver input thresholds, a key requirement for SN74CB3Q6800DBQR deployment in PCI hot-plug and modular backplane systems.
Can the SN74CB3Q6800DBQR operate with a 2.5 V supply voltage?
Yes, the SN74CB3Q6800DBQR is fully specified for operation from 2.3 V to 3.6 V, including 2.5 V nominal supply. At VCC = 2.5 V, its typical ON-state resistance remains 4.8 Ω, and it maintains full 5-V tolerance on I/O pins-ensuring reliable interoperability with mixed-voltage systems without external level-shifting circuitry.
Does the SN74CB3Q6800DBQR support partial-power-down mode?
Yes, the SN74CB3Q6800DBQR includes Ioff circuitry that limits leakage current to ≤1 µA when VCC = 0 V, enabling safe partial-power-down operation. This feature allows SN74CB3Q6800DBQR to isolate powered-down subsystems while maintaining signal integrity on shared buses-a necessity in battery-powered and thermally constrained embedded designs.
What package type is used for the SN74CB3Q6800DBQR?
The SN74CB3Q6800DBQR uses a 24-pin SSOP (Shrink Small Outline Package), designated DBQ, with dimensions of 7.9 mm × 4.5 mm × 1.2 mm max height. It is supplied in tape-and-reel format (2500 units per reel), RoHS-compliant, with NiPdAu lead finish and JEDEC MSL Level-2-260°C-1 year reflow rating.
SN74CB3Q6800DBQR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 10 x 1:1
- Independent Circuits:
- 1
- 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:
- 24-SSOP
SN74CB3Q6800DBQR FAQ
1.How can I place an order for SN74CB3Q6800DBQR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3Q6800DBQR 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 SN74CB3Q6800DBQR reliable?
The price and inventory of SN74CB3Q6800DBQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3Q6800DBQR is usually 5 days.
3.What payment methods are accepted for SN74CB3Q6800DBQR?
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SN74CB3Q6800DBQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CB3Q6800DBQR 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 SN74CB3Q6800DBQR?
For technical support, including SN74CB3Q6800DBQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3Q6800DBQR requirements.
6.How does Aetrix verify that SN74CB3Q6800DBQR is sourced from the original manufacturer or authorized distributors?
All SN74CB3Q6800DBQR 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 SN74CB3Q6800DBQR meets industry standards.
7.What is the process for return or replacement of SN74CB3Q6800DBQR?
All SN74CB3Q6800DBQR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3Q6800DBQR, 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 SN74CB3Q6800DBQR part is unused and in its original packaging.
Return procedure for SN74CB3Q6800DBQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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