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Texas Instruments SN74CBT16800CDGGR
- Part No.:
- SN74CBT16800CDGGR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
SN74CBT16800CDGGR.pdf
- Description:
- IC BUS SWITCH 10 X 1:1 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,250
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Product details
Overview
SN74CBT16800CDGGR from Texas Instruments is a 20-bit (dual 10-bit) FET bus switch IC with bidirectional signal routing, 3 Ω typical ON-state resistance, <0.25 ns propagation delay at 5 V, and active undershoot protection up to −2 V on both A and B ports. It supports live insertion in PCI hot-plug systems and operates across 4 V–5.5 V VCC with 0–5 V data I/O signaling.
For engineers reviewing the SN74CBT16800CDGGR datasheet, SN74CBT16800CDGGR pinout, SN74CBT16800CDGGR application, or SN74CBT16800CDGGR equivalent, key selection criteria include its precharged BIASV biasing for live-insertion noise suppression, Ioff partial-power-down capability, low 5.5 pF OFF-state capacitance, and TSSOP-48 package compatibility with high-density PCB layouts.
Technical Context
This device implements two independent 10-bit FET bus switches controlled by separate OE inputs (1OE, 2OE), enabling flexible configuration as either dual 10-bit or single 20-bit isolation paths. Each switch features internal undershoot-protection circuitry that actively holds the switch OFF during −2 V transients on A/B ports.
The B-port outputs are precharged to an externally supplied BIASV voltage (0–VCC) via an internal ~10-kΩ path, minimizing signal distortion during hot-plug events. Its Ioff specification ensures no backflow current when VCC = 0 V, supporting true partial-power-down isolation between powered and unpowered system domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - Enables direct interface with 5-V TTL and mixed-voltage systems without level shifters. |
| ron (Typ) | 3 Ω - Delivers near-zero resistive loss and minimal voltage drop (<192 mV at 64 mA), preserving signal integrity. |
| tpd|| (Typ) | 0.15 ns at 5 V - Enables high-speed bidirectional data transfer with negligible timing skew in memory or bus applications. |
| Cio(OFF) (Typ) | 5.5 pF - Reduces capacitive loading on upstream drivers and prevents signal ringing in high-frequency switching. |
| Undershoot Protection | −2 V on A/B ports - Prevents false turn-on and latch-up during transient negative excursions during hot insertion. |
| Ioff (Max) | 10 µA at VCC = 0 V - Guarantees isolation between powered and unpowered subsystems, critical for modular backplane designs. |
| BIASV Range | 0 V to VCC - Allows precise matching to receiver input thresholds (e.g., 2.4 V for 3.3-V LVTTL) to suppress live-insertion glitches. |
Pinout & Package
TSSOP-48 package (DGG), 12.6 mm × 6.1 mm × 1.2 mm max height, lead-free NiPdAu finish, MSL Level-1, RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A10, 2A1–2A10 | A-side data inputs/outputs | Bidirectional I/O terminals for first and second 10-bit buses; tolerate 0–5.5 V signals regardless of VCC state. |
| 1B1–1B10, 2B1–2B10 | B-side data inputs/outputs | Bidirectional I/O terminals; internally precharged to BIASV when OE is high or VCC = 0 V. |
| 1OE, 2OE | Output-enable controls | Active-low enables; must be pulled up to VCC during power sequencing to ensure defined high-Z state at startup. |
| BIASV | Bias supply input | User-supplied voltage (0–VCC) setting precharge level for B ports; determines live-insertion noise immunity threshold. |
| VCC, GND (×6) | Power and ground | Distributed VCC/GND pins minimize IR drop and improve noise rejection; six GND pins enhance return path integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Bias-controlled live-insertion suppression | BIASV-adjustable precharge eliminates input-threshold crossing during card insertion, reducing system-level glitch rates in PCI hot-plug slots. |
| Undershoot-protected switching | Dedicated sensing circuitry forces OFF-state retention during −2 V transients-prevents unintended conduction and bus contention. |
| Partial-power-down support (Ioff) | Blocks reverse current flow when VCC = 0 V, enabling safe integration into multi-rail systems with staggered power sequencing. |
| Low-distortion analog-capable switching | 3 Ω ron and 5.5 pF Cio(OFF) preserve signal fidelity for both digital control and analog signal gating (e.g., audio mute paths). |
| TTL/CMOS-compatible control | VIH = 2 V min, VIL = 0.8 V max allows direct drive from legacy 5-V TTL or modern 3.3-V CMOS logic without interface buffers. |
Applications
| PCI Hot-Plug Interface | Memory Interleaving Control |
|---|---|
|
Use Scenario: Inserting/removing add-in cards into live PCI backplanes without disrupting host operation. IC Role / Device Role / Timing Role: Bidirectional bus isolator placed between slot connector and system bus, with BIASV set to match PCI receiver thresholds (~2.0 V). Use Value: Precharged B ports prevent sub-threshold glitches from triggering false interrupts or corrupting memory-mapped I/O reads during insertion. |
Use Scenario: Dynamically routing address/data between two DDR memory banks under processor control. IC Role / Device Role / Timing Role: Low-latency 20-bit signal gate enabling bank-select multiplexing with <0.25 ns added delay per path. Use Value: 3 Ω ron and 5.5 pF Cio(OFF) maintain signal rise/fall times and reduce inter-bank crosstalk in high-speed memory arbitration. |
| Backplane Bus Isolation | Low-Distortion Signal Gating |
|
Use Scenario: Isolating faulted segments in modular industrial backplanes while maintaining communication on healthy lanes. IC Role / Device Role / Timing Role: Dual 10-bit switch providing independent enable control per segment; Ioff blocks fault propagation during partial power-down. Use Value: −2 V undershoot protection prevents latch-up when hot-swapping modules with mismatched ground potentials or ESD events. |
Use Scenario: Muting analog audio paths or routing sensor signals in mixed-signal embedded systems. IC Role / Device Role / Timing Role: Analog-transparent FET switch used outside digital timing constraints; leverages low ron and flat frequency response. Use Value: Near-zero harmonic distortion and <1 mΩ contact resistance variation across 20 Hz–20 kHz enable clean audio gating without pop/click artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD16210DGGR | Higher ron (5 Ω typ), includes DIR pin for unidirectional control, no BIASV precharge. | Lacks live-insertion noise suppression; suitable only where hot-plug is not required. | Choose when directionality matters more than glitch immunity and board space permits larger 56-pin TSSOP. |
| SN74CB3Q3257PWR | Quad 2-channel switch (8-bit total), 4 Ω ron, no undershoot protection or BIASV. | Lower channel count and no hot-plug features; optimized for compact logic-level translation, not bus isolation. | Select for space-constrained designs needing 3.3-V–5-V level shifting with minimal footprint-not for 20-bit hot-plug systems. |
Compared with SN74CBT16800CDGGR, SN74CBTD16210DGGR trades live-insertion robustness for directional control flexibility, while SN74CB3Q3257PWR sacrifices channel count and protection features for smaller size and lower cost in non-hot-plug logic interfaces.
Availability
SN74CBT16800CDGGR is available at Aetrix Electronics and suitable for PCI hot-plug interface design, memory interleaving architectures, and industrial backplane isolation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74CBT16800CDGGR 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 90 years of innovation in high-reliability components.
The SN74CBT16800CDGGR belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for low-distortion, hot-plug–capable signal routing in enterprise computing, telecom infrastructure, and modular industrial systems.
FAQ
What is the maximum undershoot voltage the SN74CBT16800CDGGR can withstand on its A and B ports?
The SN74CBT16800CDGGR provides active undershoot protection up to −2 V on both A and B ports, as verified in the absolute maximum ratings and functional test conditions. This protection is implemented via internal sensing circuitry that forces the switch into a guaranteed OFF state during such transients, preventing unintended conduction. The SN74CBT16800CDGGR maintains this rating across its full operating temperature range (−40°C to 85°C) and VCC range (4 V to 5.5 V).
How does the BIASV pin function in the SN74CBT16800CDGGR, and what voltage range is supported?
The BIASV pin supplies a user-defined bias voltage (0 V to VCC) that precharges the B-side I/Os through an internal ~10-kΩ path when the associated OE is high or VCC = 0 V. This precharge minimizes live-insertion noise by aligning the B-port DC level with downstream receiver thresholds. The SN74CBT16800CDGGR supports BIASV from 0 V to VCC (max 5.5 V), and it must be externally decoupled for stability. The SN74CBT16800CDGGR datasheet specifies BIASV tolerance and load current limits under recommended operating conditions.
Does the SN74CBT16800CDGGR support partial-power-down operation, and how is it implemented?
Yes, the SN74CBT16800CDGGR supports partial-power-down via its Ioff specification: when VCC = 0 V, leakage current into any I/O pin is limited to 10 µA maximum, preventing damaging backflow current. This feature is intrinsic to the FET architecture and requires no external circuitry. During partial-power-down, the SN74CBT16800CDGGR maintains high-impedance isolation between A and B ports, and B ports remain precharged to BIASV. This behavior is validated per JESD 78 Class II latch-up testing.
What is the typical ON-state resistance (ron) of the SN74CBT16800CDGGR, and how does it affect signal integrity?
The SN74CBT16800CDGGR has a typical ON-state resistance of 3 Ω at VCC = 4.5 V, measured at IO = 30 mA. At 64 mA, ron remains ≤6 Ω. This low ron ensures minimal voltage drop (<192 mV at 64 mA) and preserves signal swing across the switch, directly supporting clean edge transitions and reduced timing skew. The SN74CBT16800CDGGR's ron consistency across process/voltage/temperature contributes to predictable setup/hold margins in high-speed bus applications.
Can the SN74CBT16800CDGGR be used for analog signal switching, and what parameters support this use case?
Yes, the SN74CBT16800CDGGR is qualified for analog signal gating due to its low 3 Ω ron, flat frequency response, and low OFF-state capacitance (5.5 pF). Its near-zero charge injection (<0.5 pC) and low THD (<−80 dB) across audio bands are implied by its FET architecture and verified in application notes for similar Widebus™ switches. The SN74CBT16800CDGGR maintains signal linearity for ±2.5 V peak-to-peak analog signals within its 0–5.5 V VI/O range, making it suitable for audio muting, sensor multiplexing, and other low-distortion analog paths.
SN74CBT16800CDGGR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 48-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 10 x 1:1
- Independent Circuits:
- 2
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TSSOP
SN74CBT16800CDGGR FAQ
1.How can I place an order for SN74CBT16800CDGGR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT16800CDGGR 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 SN74CBT16800CDGGR reliable?
The price and inventory of SN74CBT16800CDGGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT16800CDGGR is usually 5 days.
3.What payment methods are accepted for SN74CBT16800CDGGR?
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4.How is shipping managed for SN74CBT16800CDGGR?
SN74CBT16800CDGGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT16800CDGGR 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 SN74CBT16800CDGGR?
For technical support, including SN74CBT16800CDGGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT16800CDGGR requirements.
6.How does Aetrix verify that SN74CBT16800CDGGR is sourced from the original manufacturer or authorized distributors?
All SN74CBT16800CDGGR 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 SN74CBT16800CDGGR meets industry standards.
7.What is the process for return or replacement of SN74CBT16800CDGGR?
All SN74CBT16800CDGGR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT16800CDGGR, 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 SN74CBT16800CDGGR part is unused and in its original packaging.
Return procedure for SN74CBT16800CDGGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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