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Texas Instruments SN74CB3Q6800PW
- Part No.:
- SN74CB3Q6800PW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CB3Q6800PW.pdf
- Description:
- IC BUS SWITCH 10 X 1:1 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,157
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Product details
Overview
SN74CB3Q6800PW from Texas Instruments is a 10-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 delivers rail-to-rail switching, 4.5 Ω typical ON-state resistance (ron), <0.225 ns propagation delay, and 5-V tolerant I/Os - enabling low-distortion PCI interface and hot-plug applications.
For engineers reviewing the SN74CB3Q6800PW datasheet, SN74CB3Q6800PW pinout, SN74CB3Q6800PW application, or SN74CB3Q6800PW equivalent, key selection criteria include precharge-enabled live-insertion noise suppression, partial-power-down (Ioff) support, 500 MHz bandwidth capability, and TSSOP-24 package compatibility with space-constrained board layouts.
Technical Context
The SN74CB3Q6800PW integrates a charge-pump circuit to elevate gate voltage of its pass transistors, ensuring flat, low ron across 0–5 V I/O signaling levels. Its single ON control input enables synchronous 10-bit bidirectional connection between A and B ports, with B-port precharging via dedicated BIASV terminal to minimize signal distortion during hot insertion.
It supports partial-power-down operation via Ioff protection, blocks backflow current when VCC = 0 V, and features undershoot clamp diodes on all data and control inputs. The device operates across 2.3 V to 3.6 V VCC and accepts 0–5.5 V signals on I/O pins regardless of power state - critical for mixed-voltage system interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - ensures stable operation across 2.5-V and 3.3-V logic domains without level-shifting. |
| ron (Typ) | 4.5 Ω at VCC = 3.3 V - enables minimal voltage drop and near-zero propagation delay in high-speed data paths. |
| Bandwidth | Up to 500 MHz - supports broadband communications, memory interleaving, and differential signal gating. |
| I/O Voltage Range | 0 V to 5.5 V - allows interoperability with 5-V, 3.3-V, 2.5-V, and 1.8-V systems while powered or unpowered. |
| tpd (Max) | 0.225 ns - guarantees sub-nanosecond timing integrity for high-frequency bus isolation and signal routing. |
| Cio(OFF) (Typ) | 3.5 pF - reduces capacitive loading on active buses, preserving signal edge rate and minimizing crosstalk. |
| Ioff (Max) | 1 µA at VCC = 0 V - prevents damaging current flow during partial-power-down or hot-plug events. |
Pinout & Package
TSSOP-24 (PW) package: 7.9 mm × 4.5 mm × 1.2 mm body, 0.65 mm lead pitch, exposed pad not present, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A10 | Data input/output (A-side) | Bidirectional signal path connected to B1–B10 when ON = L; high-impedance when ON = H. |
| B1–B10 | Data input/output (B-side) | Bidirectional signal path; internally precharged to BIASV when switch is OFF to suppress live-insertion glitches. |
| ON | Active-low enable input | Drives internal switch array; must be pulled up to VCC during power-up/down to ensure defined high-Z state. |
| BIASV | Bias supply terminal | Provides precharge voltage (0–5 V) to B-port outputs; sets threshold for glitch suppression during hot-plug events. |
| VCC | Power supply | Supplies core logic and charge pump; range 2.3–3.6 V defines operational voltage window and ron flatness. |
| GND | Ground reference | Common return for VCC, BIASV, and all I/O; required for proper clamp diode and Ioff functionality. |
Key Features
| Feature | Design Value |
|---|---|
| Precharged B-port outputs | Reduces live-insertion noise by biasing B outputs to receiver input threshold, preventing false triggering during card mating. |
| 5-V tolerant I/Os | Enables seamless interfacing between legacy 5-V peripherals and modern 2.5/3.3-V buses without external level shifters. |
| Charge-pump enhanced ron | Maintains 4.5 Ω typical ON-resistance across full 0–5 V signal swing, ensuring consistent timing and low insertion loss. |
| Partial-power-down support (Ioff) | Blocks >99.9% of backflow current when VCC = 0 V, protecting powered-down sections during system-level power sequencing. |
| Rail-to-rail signal switching | Supports full-swing analog and digital signals from GND to 5.5 V, making it suitable for both digital bus isolation and low-distortion analog gating. |
Applications
| PCI Hot-Plug Interface | Differential Signal Routing |
|---|---|
|
Use Scenario: Inserting/removing add-in cards into live PCI backplanes without disrupting active bus traffic. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating card-side signals from motherboard; B-port precharged to match PCI receiver thresholds. Use Value: Eliminates insertion-induced glitches that cause data corruption or system reset by holding B outputs at safe DC bias before contact. |
Use Scenario: Routing LVDS or RSDS differential pairs through shared backplane traces while maintaining signal integrity. IC Role / Device Role / Timing Role: Low-capacitance, low-ron analog switch enabling clean signal gating without skew or amplitude loss. Use Value: 3.5 pF OFF-state capacitance and <0.225 ns tpd preserve differential timing margins and reduce jitter accumulation. |
| Memory Interleaving Control | Low-Distortion Analog Signal Gating |
|
Use Scenario: Dynamically selecting between two DDR memory banks using shared address/control lines in embedded controllers. IC Role / Device Role / Timing Role: 10-bit bidirectional switch enabling time-multiplexed access to dual memory modules with zero added latency. Use Value: Flat 4.5 Ω ron and rail-to-rail operation prevent address skew and ensure setup/hold timing compliance across voltage corners. |
Use Scenario: Enabling/disabling audio or sensor analog signals in battery-powered IoT nodes to reduce standby power. IC Role / Device Role / Timing Role: Analog switch with 5-V tolerant I/Os and sub-10 pF ON/OFF capacitance for wideband signal path control. Use Value: 9–11 pF Cio(ON) minimizes loading on op-amp outputs; 500 MHz bandwidth preserves harmonic content up to 100 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT6800PW | No BIASV pin; lacks precharged output capability; higher ron (6 Ω typ); no Ioff support. | Not suitable for hot-plug or partial-power-down systems; limited to static 3.3-V-only environments. | Select only if precharge and power-down isolation are unnecessary and cost is primary constraint. |
| SN74LVC1G3157DBVR | Single-channel SPDT; no BIASV; 5-V tolerant; 6 Ω ron; supports 1.65–5.5 V VCC. | Requires 10× devices for full 10-bit function; no coordinated precharge; unsuitable for synchronized bus gating. | Use only for discrete signal routing where channel independence outweighs integration and timing coherence needs. |
Compared with SN74CB3Q6800PW, SN74CBT6800PW omits critical live-insertion safeguards and power-down protection, while SN74LVC1G3157DBVR sacrifices integration density and synchronized control - making SN74CB3Q6800PW the sole choice for robust, high-bandwidth, 10-bit hot-plug–ready bus isolation.
Availability
SN74CB3Q6800PW is available at Aetrix Electronics and suitable for PCI interface design, memory subsystem isolation, and hot-pluggable module development requiring stable component supply and long-term manufacturability.
Supply support for SN74CB3Q6800PW 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 50 years of innovation in high-reliability interface solutions.
The SN74CB3Q6800PW belongs to TI's CB3Q family of high-bandwidth FET bus switches, engineered specifically for live-insertion–capable computing and communications infrastructure where signal fidelity and power-state robustness are non-negotiable.
FAQ
What is the maximum operating frequency supported by the SN74CB3Q6800PW?
The SN74CB3Q6800PW supports a maximum switching frequency of 20 MHz on its ON control input under specified load conditions (RL ≥ 1 MΩ, CL = 0). Its high-bandwidth data path handles signals up to 500 MHz, making it suitable for fast digital and analog signal routing where timing integrity is critical. This performance is enabled by its low 4.5 Ω typical ON-state resistance and minimal 3.5 pF OFF-state capacitance.
How does the BIASV pin function in the SN74CB3Q6800PW?
The BIASV pin on the SN74CB3Q6800PW supplies a bias voltage (0–5 V) used to precharge the B-port outputs to a defined DC level when the switch is disabled (ON = H) or powered down. This precharge minimizes signal distortion and eliminates live-insertion glitches by ensuring B outputs remain outside the input threshold region of downstream receivers during card mating. It is not a control input but a dedicated supply terminal.
Can the SN74CB3Q6800PW operate with a 2.5-V supply?
Yes, the SN74CB3Q6800PW is fully specified for 2.5-V operation within its recommended VCC range of 2.3 V to 3.6 V. At 2.5 V, it maintains rail-to-rail switching, 4.8 Ω typical ON-state resistance, and full 5-V I/O tolerance - enabling interoperability with mixed-voltage systems without level translation. Its charge-pump architecture ensures consistent ron performance across this entire voltage range.
Does the SN74CB3Q6800PW support partial-power-down mode?
Yes, the SN74CB3Q6800PW includes Ioff circuitry that actively disables current paths when VCC = 0 V, limiting backflow current to ≤1 µA. This feature enables safe partial-power-down operation in modular systems, such as hot-pluggable line cards, where some sections remain powered while others are de-energized - preventing damage and ensuring system-level power sequencing integrity.
What package type is used for the SN74CB3Q6800PW?
The SN74CB3Q6800PW uses a TSSOP-24 (PW) package: 7.9 mm × 4.5 mm × 1.2 mm body size, 0.65 mm lead pitch, with 24 leads and NIPDAU lead finish. It is rated MSL Level-1 (unlimited floor life), RoHS-compliant, and supplied in tubes of 60 units. This compact, surface-mount package supports high-density PCB layouts while maintaining thermal and electrical performance for high-speed switching.
SN74CB3Q6800PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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-TSSOP
SN74CB3Q6800PW FAQ
1.How can I place an order for SN74CB3Q6800PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3Q6800PW 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 SN74CB3Q6800PW reliable?
The price and inventory of SN74CB3Q6800PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3Q6800PW is usually 5 days.
3.What payment methods are accepted for SN74CB3Q6800PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CB3Q6800PW transactions.
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4.How is shipping managed for SN74CB3Q6800PW?
SN74CB3Q6800PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CB3Q6800PW 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 SN74CB3Q6800PW?
For technical support, including SN74CB3Q6800PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3Q6800PW requirements.
6.How does Aetrix verify that SN74CB3Q6800PW is sourced from the original manufacturer or authorized distributors?
All SN74CB3Q6800PW 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 SN74CB3Q6800PW meets industry standards.
7.What is the process for return or replacement of SN74CB3Q6800PW?
All SN74CB3Q6800PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3Q6800PW, 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 SN74CB3Q6800PW part is unused and in its original packaging.
Return procedure for SN74CB3Q6800PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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