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Texas Instruments SN74CBT16800CDGVR
- Part No.:
- SN74CBT16800CDGVR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 48-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT16800CDGVR.pdf
- Description:
- IC BUS SWITCH 10 X 1:1 48TVSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,847
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Product details
Overview
SN74CBT16800CDGVR from Texas Instruments is a 20-bit FET bus switch IC with dual 10-bit configurable switching, 3 Ω typical ON-state resistance, −2 V undershoot protection on A/B ports, BIASV-controlled precharge for live-insertion noise suppression, and support for 0–5-V signaling across mixed-voltage systems. It serves as bidirectional signal gate in PCI hot-plug interfaces and memory interleaving paths.
For engineers reviewing the SN74CBT16800CDGVR datasheet, SN74CBT16800CDGVR pinout, SN74CBT16800CDGVR application, or SN74CBT16800CDGVR equivalent, key selection criteria include Ioff partial-power-down capability, 0.15 ns propagation delay at 5 V, TSSOP-48 package thermal impedance (58°C/W), and BIASV bias voltage programmability for receiver threshold alignment during hot insertion.
Technical Context
This device implements two independent 10-bit FET bus switches with separate OE controls (1OE/2OE), enabling either dual 10-bit or single 20-bit operation. Each switch features active undershoot-protection circuitry that maintains OFF-state integrity when A/B port voltages dip to −2 V, and internal precharge to user-supplied BIASV (0–VCC) via ~10-kΩ equivalent resistance.
It supports full 0–5.5 V data I/O signaling independent of VCC (4–5.5 V), accepts TTL/3.3-V/5-V CMOS control inputs, and delivers near-zero propagation delay (0.15 ns typical at 5 V) due to low ron and minimal Cio(OFF) = 5.5 pF. Ioff functionality ensures isolation and prevents backflow current during partial power-down (VCC = 0 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ON-state resistance (ron) | 3 Ω typical - enables minimal voltage drop and signal distortion at ±128 mA per switch path |
| Propagation delay (tpd) | 0.15 ns at VCC = 5 V - supports high-speed bidirectional data transfer without timing penalty |
| VCC operating range | 4 V to 5.5 V - compatible with standard 5-V logic rails and tolerant of supply variation |
| BIASV voltage range | 0 V to VCC - allows precise precharge alignment to receiver input thresholds (e.g., 1.2 V, 1.8 V, 2.5 V) |
| Undershoot protection | −2 V on A/B ports - prevents false turn-on and maintains high-impedance state during connector mating transients |
| Ioff leakage current | 10 µA max at VCC = 0 V - guarantees isolation and eliminates backfeed risk in powered-down subsystems |
| Input/output capacitance (Cio(OFF)) | 5.5 pF typical - reduces capacitive loading and preserves signal edge integrity on shared buses |
| Supply current (ICC) | 3 µA max - enables ultra-low static power in always-on or standby bus-isolation applications |
Pinout & Package
TSSOP-48 package (DGV), 12.6 mm × 6.2 mm × 1.2 mm max height, moisture sensitivity level 1 (260°C peak reflow), lead finish NiPdAu, RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A10, 2A1–2A10 | A-side data inputs/outputs | Bidirectional signal terminals for first and second 10-bit switch banks; tolerate 0–5.5 V regardless of VCC |
| 1B1–1B10, 2B1–2B10 | B-side data inputs/outputs | Bidirectional terminals precharged to BIASV when OE high; critical for live-insertion noise suppression |
| 1OE, 2OE | Output-enable controls | Active-low enables; must be pulled up to VCC during power-up/down to ensure defined high-Z state |
| BIASV | Bias supply input | User-supplied voltage (0–VCC) setting precharge level on B ports; directly sets glitch margin vs. receiver thresholds |
| VCC | Switch core supply | Powers internal FETs and protection circuitry; range 4–5.5 V; independent of data voltage levels |
| GND (Pins 7, 17, 35, 47) | Ground reference | Four dedicated ground pins minimize ground bounce and improve noise immunity in high-speed switching |
Key Features
| Feature | Design Value |
|---|---|
| Undershoot protection | Detects and blocks conduction during −2 V transients on A/B ports, preserving OFF-state integrity during connector mating |
| BIASV-controlled precharge | Internally pulls B ports to user-defined voltage via ~10-kΩ equivalent resistor, minimizing live-insertion glitches crossing receiver thresholds |
| Ioff partial-power-down | Enables safe isolation when VCC = 0 V; limits backflow current to ≤10 µA, protecting powered subsystems |
| Mixed-voltage I/O support | 0–5.5 V data signaling independent of VCC (4–5.5 V), allowing interface between 1.2-V, 1.8-V, 2.5-V, 3.3-V, and 5-V domains |
| Low-distortion switching | 3 Ω ron + 5.5 pF Cio(OFF) yields <0.15 ns tpd and minimal rise/fall time degradation on 50-pF loads |
| PCI Hot Plug compliance | Meets mechanical and electrical requirements for hot-plug insertion into active PCI buses via undershoot protection and BIASV precharge |
Applications
| PCI Hot-Plug Interface | Memory Interleaving Bus Isolation |
|---|---|
|
Use Scenario: Inserting/removing add-in cards into live PCI backplanes without disrupting system operation. IC Role / Device Role / Timing Role: Bidirectional bus switch providing transient-protected, precharged signal gating between card and host bus. Use Value: Eliminates bus glitches by precharging B ports to match receiver threshold (e.g., 2.0 V), while −2 V undershoot protection prevents false turn-on during pin make/break. |
Use Scenario: Isolating dual memory banks sharing a common data bus to prevent contention during interleaved access. IC Role / Device Role / Timing Role: Low-latency 20-bit switch enabling dynamic routing of address/data lines between controllers and memory modules. Use Value: Near-zero propagation delay (0.15 ns) and 3 Ω ron preserve timing margins and signal integrity across DDR/SDRAM clock domains. |
| Low-Distortion Signal Gating | Mixed-Voltage Domain Bridging |
|
Use Scenario: Enabling/disabling analog or digital signals in test equipment where waveform fidelity must be preserved. IC Role / Device Role / Timing Role: Analog-capable FET switch with flat ron over voltage range, used as precision signal gate in ATE channel muxes. Use Value: 5.5 pF Cio(OFF) and 15.5 pF Cio(ON) minimize capacitive discontinuity; low ron ensures <1% THD at 10 MHz with 50-Ω source/load. |
Use Scenario: Interfacing 1.8-V FPGA I/O banks to legacy 3.3-V or 5-V peripherals without level shifters. IC Role / Device Role / Timing Role: Voltage-agnostic bidirectional switch supporting 0–5.5 V signaling on both sides independent of 4–5.5 V VCC. Use Value: Enables direct connection across voltage domains with no external biasing or translation logic, reducing BOM count and layout area. |
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 integrated 5-V tolerant level shifters, no BIASV pin | Designed for level translation between 3.3-V/5-V domains; lacks live-insertion precharge capability | Select when voltage translation is required and hot-plug noise suppression is not critical |
| SN74CBT16210DGGR | Same 48-pin TSSOP package, 3 Ω ron, but only 10-bit (not 20-bit); no BIASV or undershoot protection | Suitable for smaller bus widths; cannot replace SN74CBT16800CDGVR in 20-bit or PCI hot-plug roles | Choose for cost-sensitive 10-bit isolation where BIASV and −2 V protection are unnecessary |
Compared with SN74CBT16800CDGVR, SN74CBTD16210DGGR adds level-shifting but removes BIASV-driven live-insertion optimization, while SN74CBT16210DGGR halves channel count and omits critical hot-plug features-making SN74CBT16800CDGVR uniquely suited for 20-bit, mixed-voltage, hot-plug-critical designs.
Availability
SN74CBT16800CDGVR is available at Aetrix Electronics and suitable for PCI hot-plug interfaces, memory interleaving architectures, and mixed-voltage domain bridging requiring stable component supply, long-term lifecycle continuity, and RoHS-compliant TSSOP packaging.
Supply support for SN74CBT16800CDGVR 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-speed logic and interface solutions.
The SN74CBT16800CDGVR belongs to TI's Widebus™ family of FET bus switches, engineered specifically for low-distortion, hot-plug-capable signal routing in PCI, memory, and mixed-voltage system interconnects.
FAQ
What is the maximum undershoot voltage the SN74CBT16800CDGVR can withstand on its A and B ports?
The SN74CBT16800CDGVR provides active undershoot protection up to −2 V on both A and B ports, ensuring the switch remains reliably in the OFF state during transient negative excursions caused by connector mating or signal reflections. This specification is verified per the absolute maximum ratings and functional undershoot static protection (VO(USP)) test condition in the datasheet, where the device maintains high-impedance isolation even at −2 V.
How does the BIASV pin function in the SN74CBT16800CDGVR, and what voltage range is supported?
The BIASV pin on the SN74CBT16800CDGVR supplies a user-defined bias voltage (0 V to VCC) that precharges all B-side ports through an internal ~10-kΩ equivalent resistor when the associated OE is high or VCC = 0 V. This precharge minimizes live-insertion noise by aligning B-port voltage with receiver input thresholds. The BIASV range is explicitly specified as 0 V to VCC in the recommended operating conditions table.
Can the SN74CBT16800CDGVR operate with different supply and signal voltage levels simultaneously?
Yes. The SN74CBT16800CDGVR supports independent voltage domains: VCC operates from 4 V to 5.5 V, while data I/Os (A and B ports) tolerate 0 V to 5.5 V regardless of VCC level. This enables direct interfacing between 1.2-V, 1.8-V, 2.5-V, 3.3-V, and 5-V logic families without external level shifters-confirmed by the "Data I/Os Support 0 to 5-V Signaling Levels" feature and VI/O specification.
What is the typical ON-state resistance (ron) of the SN74CBT16800CDGVR, and how does it affect signal integrity?
The SN74CBT16800CDGVR has a typical ON-state resistance of 3 Ω, measured at VCC = 4.5 V, VI = 0 V, and IO = 30 mA. This low ron minimizes voltage drop and power dissipation across the switch, preserving signal amplitude and timing margins-especially critical in high-speed, low-voltage applications like DDR memory buses or PCI Express sideband signals.
Does the SN74CBT16800CDGVR support partial-power-down operation, and how is it implemented?
Yes. The SN74CBT16800CDGVR implements Ioff partial-power-down functionality: when VCC = 0 V, leakage current into any I/O pin is limited to ≤10 µA, preventing damaging backflow current into powered subsystems. This behavior is guaranteed per JESD 78 Class II latch-up testing and is explicitly enabled by the device's internal architecture-not requiring external circuitry.
SN74CBT16800CDGVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 48-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-TVSOP
SN74CBT16800CDGVR FAQ
1.How can I place an order for SN74CBT16800CDGVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT16800CDGVR 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 SN74CBT16800CDGVR reliable?
The price and inventory of SN74CBT16800CDGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT16800CDGVR is usually 5 days.
3.What payment methods are accepted for SN74CBT16800CDGVR?
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4.How is shipping managed for SN74CBT16800CDGVR?
SN74CBT16800CDGVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT16800CDGVR 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 SN74CBT16800CDGVR?
For technical support, including SN74CBT16800CDGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT16800CDGVR requirements.
6.How does Aetrix verify that SN74CBT16800CDGVR is sourced from the original manufacturer or authorized distributors?
All SN74CBT16800CDGVR 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 SN74CBT16800CDGVR meets industry standards.
7.What is the process for return or replacement of SN74CBT16800CDGVR?
All SN74CBT16800CDGVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT16800CDGVR, 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 SN74CBT16800CDGVR part is unused and in its original packaging.
Return procedure for SN74CBT16800CDGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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