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Texas Instruments SN74CBT6800CDBQRG4
- Part No.:
- SN74CBT6800CDBQRG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SN74CBT6800CDBQRG4.pdf
- Description:
- IC BUS SW 10 X 1:1 24SSOP/QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,997
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Product details
Overview
SN74CBT6800CDBQRG4 from Texas Instruments is a 10-bit TTL-compatible FET bus switch with bidirectional signal flow, 3 Ω typical ON-state resistance (ron), −2 V undershoot protection on A/B ports, and B-port precharge via BIASV for live-insertion noise suppression in PCI hot-plug systems.
For engineers reviewing the SN74CBT6800CDBQRG4 datasheet, SN74CBT6800CDBQRG4 pinout, SN74CBT6800CDBQRG4 application, or SN74CBT6800CDBQRG4 equivalent, key selection criteria include its 0.15 ns propagation delay at 5 V, 5.5 pF OFF-state I/O capacitance, Ioff partial-power-down support, and TSSOP-24 package compatibility with 0–5 V signaling across mixed-voltage buses.
Technical Context
This device implements a 10-channel analog/digital bus switch using low-threshold FETs, with independent undershoot-protection circuitry per A/B port that clamps to −2 V and maintains OFF-state integrity during voltage transients. Its bias-voltage (BIASV) input enables user-configurable precharge of B-port lines to minimize threshold-crossing glitches during hot insertion.
The SN74CBT6800CDBQRG4 features true bidirectional operation with near-zero propagation delay (0.15 ns typical at VCC = 5 V), supports partial-power-down via Ioff (10 µA max at VCC = 0), and provides undervoltage lockout behavior-ensuring high-impedance isolation when VCC is unpowered or ramping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ON-state resistance (ron) | 3 Ω typical - ensures minimal voltage drop and signal attenuation across switched paths at ≤128 mA channel current. |
| Propagation delay (tpd) | 0.15 ns at VCC = 5 V - enables timing-critical high-speed bus isolation without introducing measurable latency. |
| I/O capacitance (Cio(OFF)) | 5.5 pF typical - reduces capacitive loading on source and destination buses, preserving signal edge integrity. |
| Undershoot protection | −2 V on A/B ports - prevents false switching and latch-up during negative transient events in hot-plug environments. |
| Supply voltage range (VCC) | 4 V to 5.5 V - compatible with standard 5-V TTL and mixed-signal systems requiring robust rail tolerance. |
| BIASV input range | 0 V to VCC - allows precise matching of precharge voltage to receiver input thresholds (e.g., 2.4 V for 3.3-V LVTTL). |
| Ioff current | 10 µA max at VCC = 0 - blocks backflow current during partial power-down, protecting powered subsystems from unpowered sections. |
| Operating temperature | −40°C to +85°C - qualified for industrial-grade embedded and computing applications with thermal cycling exposure. |
Pinout & Package
TSSOP-24 package (PW), 7.9 mm × 4.5 mm × 1.2 mm body, 0.65 mm lead pitch, exposed pad not present, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A10 | Data input/output (A-side) | 10 bidirectional signal terminals connected to one side of the bus switch array; tolerate 0–5 V signaling levels. |
| B1–B10 | Data input/output (B-side) | 10 bidirectional signal terminals connected to the other side; precharged to BIASV when switch is OFF or VCC = 0. |
| ON | Active-low enable control | Low = switch ON (A↔B connected); high = switch OFF (high-Z isolation); requires pullup to VCC for power-up safety. |
| BIASV | Bias voltage reference | User-supplied DC voltage (0–VCC) setting precharge level for B-port lines to suppress live-insertion noise. |
| VCC | Power supply | 4–5.5 V main supply; powers internal protection circuitry, clamp diodes, and switch FETs. |
| GND | Ground reference | Common return path for VCC, BIASV, and all signal I/O; required for undershoot clamp and Ioff functionality. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional zero-delay switching | 0.15 ns tpd enables transparent signal pass-through without timing budget impact in high-speed parallel buses. |
| Live-insertion noise suppression | BIASV-controlled B-port precharge eliminates threshold-crossing glitches during card insertion/removal into active buses. |
| Robust undershoot immunity | −2 V clamping on both A and B ports prevents erroneous logic transitions and protects downstream receivers during transients. |
| Mixed-voltage interface support | 0–5 V data I/O tolerance allows seamless interconnection between 0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, and 5 V logic domains. |
| Partial-power-down isolation | Ioff limits reverse current to 10 µA when VCC = 0, enabling safe integration into systems with staggered power sequencing. |
| Low capacitive loading | 5.5 pF Cio(OFF) minimizes signal distortion and crosstalk on shared buses, critical for PCI and memory interleaving. |
Applications
| PCI Hot-Plug Interface | Memory Interleaving Bus Isolation |
|---|---|
Use Scenario: Inserting/removing expansion cards into live PCI slots without disrupting system operation. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating card-side signals from motherboard bus while precharging B-port to match receiver thresholds. Use Value: Eliminates insertion-induced glitches by holding B-port at BIASV = 2.4 V, preventing false triggering of 3.3-V PCI receivers. | Use Scenario: Dynamically routing address/data between two memory banks sharing a common controller bus. IC Role / Device Role / Timing Role: Low-latency, low-capacitance 10-bit switch enabling fast bank-select isolation with sub-nanosecond propagation delay. Use Value: 3 Ω ron and 5.5 pF Cio(OFF) preserve signal rise/fall times and reduce bus contention skew across interleaved memory channels. |
| Low-Distortion Signal Gating | Legacy System Voltage Translation |
Use Scenario: Enabling/disabling analog or digital signal paths in test equipment or programmable I/O modules. IC Role / Device Role / Timing Role: Analog-capable FET switch providing symmetrical, low-distortion conduction with no DC offset or nonlinearities. Use Value: Near-zero ron variation over signal swing and 0.15 ns tpd ensure flat frequency response up to 500 MHz for RF-adjacent baseband gating. | Use Scenario: Interfacing 5-V microcontrollers with 1.8-V or 2.5-V peripheral ICs in industrial controllers. IC Role / Device Role / Timing Role: Level-shifting bus switch supporting bidirectional data flow without direction control pins or external biasing. Use Value: 0–5 V I/O tolerance and 3 Ω ron allow direct connection between disparate voltage domains while maintaining signal integrity and timing margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD6800CDBQR | Includes 3-state output drivers with separate OE control per channel group; higher ICC (15 µA), larger 24-pin SSOP package. | Designed for applications requiring individual channel enable/disable, not single ON-control bus isolation. | Select when granular per-group control is needed; avoid if single-enable 10-bit isolation suffices. |
| SN74LVC1G3157DCKR | Single-pole double-throw (SPDT) analog switch; 5-V tolerant, 6 Ω ron, 12 pF Cio(OFF), no BIASV or undershoot protection. | Suitable only for point-to-point signal routing-not 10-bit parallel bus isolation or hot-plug scenarios. | Choose for low-cost single-channel switching; reject for multi-bit, noise-sensitive, or live-insertion use cases. |
Compared with SN74CBT6800CDBQRG4, SN74CBTD6800CDBQR adds channel-group granularity at the cost of higher quiescent current and complexity, while SN74LVC1G3157DCKR offers simpler topology but lacks BIASV precharge, −2 V undershoot protection, and multi-bit synchronization-making it unsuitable for PCI hot-plug or memory interleaving.
Availability
SN74CBT6800CDBQRG4 is available at Aetrix Electronics and suitable for PCI hot-plug interfaces, memory interleaving architectures, and low-distortion signal gating applications requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant TSSOP packaging.
Supply support for SN74CBT6800CDBQRG4 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 and logic solutions.
The SN74CBT6800CDBQRG4 belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for low-latency, low-distortion signal routing in hot-pluggable computing and industrial backplane systems.
FAQ
What is the maximum undershoot voltage the SN74CBT6800CDBQRG4 can withstand on its A and B ports?
The SN74CBT6800CDBQRG4 provides active undershoot protection up to −2 V on both A and B ports, as verified in the SCDS138 datasheet under electrical characteristics (VIKU parameter). This clamping behavior ensures the switch remains reliably OFF during negative transients, preventing false logic transitions and protecting downstream receivers in hot-plug environments. The protection circuitry is integrated and does not require external components.
Does the SN74CBT6800CDBQRG4 support partial-power-down operation, and how is it implemented?
Yes, the SN74CBT6800CDBQRG4 supports partial-power-down via its Ioff feature, which limits reverse current to 10 µA maximum when VCC = 0 V and I/O voltages range from 0 to 5.5 V. This is achieved through internal circuitry that disables conduction paths while maintaining high-impedance isolation between A and B ports. The function is fully specified in the recommended operating conditions table and enables safe integration into systems with staggered power sequencing.
What is the role of the BIASV pin on the SN74CBT6800CDBQRG4, and what voltage range is valid?
The BIASV pin on the SN74CBT6800CDBQRG4 sets the precharge voltage for the B-port lines when the switch is disabled (ON = high) or unpowered (VCC = 0 V). It must be driven within 0 V to VCC, and typical values (e.g., 2.4 V) align with receiver input thresholds to suppress live-insertion noise. The device draws negligible current (≤0.25 mA) from BIASV, and the internal equivalent resistance is ~10 kΩ, as confirmed in the functional description and electrical characteristics tables.
Can the SN74CBT6800CDBQRG4 be used for analog signal switching, and what parameters confirm this capability?
Yes, the SN74CBT6800CDBQRG4 is qualified for analog signal switching due to its low ON-state resistance (3 Ω typical), flat ron vs. signal voltage profile, absence of body diodes in the FET structure, and low charge injection (<0.1 pC). Its 5.5 pF Cio(OFF) and 13.5 pF Cio(ON) capacitances, combined with sub-nanosecond propagation delay, support bandwidths exceeding 500 MHz for baseband analog gating-verified in the switching characteristics and simplified schematic sections of the SCDS138 datasheet.
What is the recommended power-up sequence for the SN74CBT6800CDBQRG4 to ensure high-impedance state at startup?
To guarantee high-impedance isolation during power-up, the ON pin of the SN74CBT6800CDBQRG4 must be held high (disabled) until VCC reaches regulation. TI recommends tying ON to VCC through a pullup resistor; the minimum value depends on the driver's sink capability but is typically ≥10 kΩ. This prevents momentary A-B connection during VCC ramp, avoiding bus contention-a requirement explicitly stated in the "description/ordering information" section of the SCDS138 datasheet.
SN74CBT6800CDBQRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Bus Switch
- Circuit:
- 10 x 1:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
SN74CBT6800CDBQRG4 FAQ
1.How can I place an order for SN74CBT6800CDBQRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT6800CDBQRG4 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 SN74CBT6800CDBQRG4 reliable?
The price and inventory of SN74CBT6800CDBQRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT6800CDBQRG4 is usually 5 days.
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Once your SN74CBT6800CDBQRG4 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 SN74CBT6800CDBQRG4?
For technical support, including SN74CBT6800CDBQRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT6800CDBQRG4 requirements.
6.How does Aetrix verify that SN74CBT6800CDBQRG4 is sourced from the original manufacturer or authorized distributors?
All SN74CBT6800CDBQRG4 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 SN74CBT6800CDBQRG4 meets industry standards.
7.What is the process for return or replacement of SN74CBT6800CDBQRG4?
All SN74CBT6800CDBQRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT6800CDBQRG4, 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 SN74CBT6800CDBQRG4 part is unused and in its original packaging.
Return procedure for SN74CBT6800CDBQRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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