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NXP Semiconductors CBT6820DGG,518
- Part No.:
- CBT6820DGG,518
- Manufacturer:
- NXP Semiconductors
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
CBT6820DGG,518.pdf
- Description:
- IC BUS SWITCH 10 X 1:1 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,927
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Product details
Overview
CBT6820DGG,518 from NXP Semiconductors (formerly Philips) is a 20-bit bi-directional TTL-compatible bus switch with precharged B-port outputs and Schottky undershoot protection for live insertion. It features 5 Ω on-resistance, 0.25 ns propagation delay at 5 V/50 pF, dual 10-bit sections with independent OE controls, and operates from –40°C to +85°C in a 48-pin TSSOP package. It is used in hot-pluggable backplane and modular system interfaces.
For engineers reviewing the CBT6820DGG,518 datasheet, CBT6820DGG,518 pinout, CBT6820DGG,518 application, or CBT6820DGG,518 equivalent, key selection criteria include live-insertion noise suppression via BIASV precharge, undershoot current handling up to –10 mA, latch-up immunity >500 mA, and ESD robustness (2000 V HBM).
Technical Context
The CBT6820DGG,518 implements two independent 10-bit switch banks, each controlled by its own OE input. When OE is low, A–B paths conduct with near-zero propagation delay and 5 Ω typical on-resistance; when OE is high, B ports are actively precharged to a user-supplied BIASV voltage through ~10 kΩ equivalent resistance.
Undershoot protection uses integrated Schottky diodes and clamp circuitry to prevent A-side negative transients (down to –1.2 V) from pulling B-side voltage below logic-high thresholds. Bias voltage range is 1.3 V to VCC, enabling compatibility with mixed-voltage systems including 3.3 V and 5 V domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-resistance (ron) | 5 Ω typical - enables minimal signal attenuation and voltage drop across switch path under 30 mA load |
| Propagation delay (tPLH/tPHL) | 0.25 ns typical at CL = 50 pF - supports high-speed data transfer without timing skew |
| BIASV range | 1.3 V to VCC - allows precharge alignment with downstream logic thresholds (e.g., 3.3 V or 5 V) |
| Undershoot static current (IUSP) | –10 mA max - clamps negative transients to protect connected receivers during live insertion |
| Latch-up immunity | >500 mA per JESD78 - ensures robust operation in noisy industrial or telecom backplane environments |
| ESD protection | 2000 V HBM / 200 V MM / 1000 V CDM - meets stringent board-level reliability requirements |
| Supply voltage (VCC) | 4.0 V to 5.5 V - compatible with standard 5 V TTL and mixed 3.3 V/5 V I/O systems |
Pinout & Package
CBT6820DGG,518 is housed in a 48-pin plastic thin shrink small outline package (TSSOP), body width 6.1 mm, drawing SOT362–1, rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A10, 2A1–2A10 | Input/output port A terminals | Bi-directional data paths for first and second 10-bit switch banks |
| 1B1–1B10, 2B1–2B10 | Input/output port B terminals | Bi-directional data paths with active precharge to BIASV when OE is high |
| 1OE, 2OE | Enable inputs | Active-low control: OE = L enables A↔B conduction; OE = H places B ports in precharged high-impedance state |
| BIASV | Bias voltage reference | User-supplied voltage (1.3 V to VCC) setting precharge level for all B ports during disable |
| VCC | Positive supply | Primary power rail (4.0–5.5 V); powers internal logic and switch bias circuitry |
| GND (pins 8,17,32,41) | Ground reference | Four dedicated ground pins minimize switching noise and improve return path integrity |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible I/O | Direct interface with legacy 5 V TTL logic without level-shifting circuitry |
| Precharged B-port outputs | Reduces live-insertion noise by holding B-side at stable logic level before connection |
| Schottky undershoot protection | Prevents shoot-through and false triggering caused by sub-ground transients on A-side |
| Dual independent enable controls | Enables selective isolation of two 10-bit data groups within same device for flexible partitioning |
| Low on-state resistance | 5 Ω typical minimizes RC delay and maintains signal integrity across high-frequency buses |
Applications
| Modular Backplane Interconnect | Hot-Swappable Card Interface |
|---|---|
Use Scenario: Connecting add-in cards to a central backplane where modules may be inserted or removed while system is powered. IC Role / Device Role / Timing Role: Bus switch isolating card-side signals from backplane during insertion; BIASV precharges card-side lines to match backplane logic levels. Use Value: Eliminates glitching and bus contention by preventing floating B-port states during mechanical mating, verified with –10 mA undershoot current handling. | Use Scenario: Enabling real-time replacement of network interface or storage modules in telecom or server chassis. IC Role / Device Role / Timing Role: Bi-directional signal bridge between host controller and peripheral module, with independent OE control per 10-bit lane. Use Value: Supports <0.25 ns propagation delay and 5 Ω on-resistance to preserve signal fidelity across 100+ MHz parallel buses. |
| Mixed-Voltage System Bridging | Legacy TTL-to-Modern Logic Interface |
Use Scenario: Interfacing 5 V TTL subsystems with 3.3 V microcontrollers or FPGAs in industrial controllers. IC Role / Device Role / Timing Role: Voltage-agnostic bus switch using BIASV = 3.3 V to precharge B-side to target logic threshold. Use Value: Avoids external level shifters; BIASV range (1.3 V to VCC) ensures safe, reliable translation without timing penalty. | Use Scenario: Upgrading legacy instrumentation with modern digital logic while retaining existing 5 V TTL signal paths. IC Role / Device Role / Timing Role: Drop-in replacement for obsolete bus switches, maintaining identical pinout and TTL electrical behavior. Use Value: Delivers 5 Ω on-resistance and 0.25 ns delay - matching or exceeding performance of earlier-generation devices like 74CBT series. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384APW | 10-bit dual-channel, 3.3 V only supply (VCC = 2.3–3.6 V), no BIASV pin, no undershoot protection | Designed for low-voltage embedded systems; lacks live-insertion support and mixed-voltage flexibility | Select when operating exclusively at 3.3 V and undershoot risk is absent |
| 74CBTLV3245APW | 8-bit octal switch, 2.3–3.6 V supply, no BIASV, no Schottky undershoot clamps, lower channel count | Targeted at compact, low-power FPGA I/O expansion; insufficient for 20-bit backplane use | Choose only for space-constrained 8-bit interfaces without live-insertion requirements |
Compared with SN74CBTD3384APW and 74CBTLV3245APW, the CBT6820DGG,518 uniquely supports 20-bit live insertion via BIASV precharge and Schottky undershoot protection - critical for telecom and industrial modular systems where 5 V tolerance and transient resilience are mandatory.
Availability
CBT6820DGG,518 is available at Aetrix Electronics and suitable for modular backplane interconnect, hot-swappable card interface, and mixed-voltage system bridging requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CBT6820DGG,518 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
NXP Semiconductors is a global semiconductor company formed from the spin-off of Philips' semiconductor division, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The CBT6820DGG,518 belongs to NXP's legacy high-speed bus switch family, engineered specifically for live-insertion reliability in telecom backplanes, modular computing, and industrial control systems demanding robust transient immunity and TTL compatibility.
FAQ
What is the function of the BIASV pin on the CBT6820DGG,518?
The BIASV pin on the CBT6820DGG,518 supplies a user-defined bias voltage (1.3 V to VCC) that precharges all B-port outputs when the corresponding OE is high. This prevents floating nodes and reduces noise during live insertion. For example, setting BIASV = 3.3 V ensures B-side logic levels align with downstream 3.3 V receivers before physical connection, directly improving system robustness in modular designs.
Does the CBT6820DGG,518 support true bi-directional signal flow?
Yes, the CBT6820DGG,518 supports fully bi-directional signal flow between A and B ports with near-symmetric 5 Ω on-resistance and 0.25 ns propagation delay in both directions. Its passive FET-based switch architecture imposes no directionality - data passes equally well from A-to-B or B-to-A, making it ideal for bidirectional data buses such as those found in PCI-style backplanes and memory-mapped I/O interfaces.
How does the CBT6820DGG,518 handle undershoot events during live insertion?
The CBT6820DGG,518 handles undershoot via integrated Schottky diodes and clamp circuitry that limit A-side negative transients to –1.2 V and sink up to –10 mA of undershoot current without affecting B-side voltage. This prevents false triggering or latch-up in connected receivers. The design ensures B-port precharge remains stable even when A-side signals dip below ground during mechanical mating - a key requirement validated per JESD22-A114 and JESD78 standards.
What is the maximum operating temperature range for the CBT6820DGG,518?
CBT6820DGG,518 is rated for continuous operation from –40°C to +85°C ambient temperature, as confirmed in the Philips/NXP product specification under Recommended Operating Conditions. This industrial-grade temperature range supports deployment in telecom equipment, factory automation controllers, and outdoor infrastructure where thermal cycling and sustained elevated temperatures are common.
Can the CBT6820DGG,518 replace older 74-series bus switches in existing designs?
Yes, the CBT6820DGG,518 can replace legacy 74CBT or 74FCT bus switches in 5 V systems due to identical TTL-compatible I/O thresholds, pin-compatible 48-pin TSSOP packaging (SOT362–1), and enhanced features including BIASV precharge and undershoot protection. Designers should verify BIASV routing and OE logic polarity but retain existing PCB layout - no trace modifications are required for drop-in functional upgrade.
CBT6820DGG,518 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74CBT
- Package/Case:
- 48-TFSOP (0.240", 6.10mm 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:
- 48-TSSOP
CBT6820DGG,518 FAQ
1.How can I place an order for CBT6820DGG,518 through Aetrix?
Please submit a Request for Quotation (RFQ) for CBT6820DGG,518 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 CBT6820DGG,518 reliable?
The price and inventory of CBT6820DGG,518 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CBT6820DGG,518 is usually 5 days.
3.What payment methods are accepted for CBT6820DGG,518?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CBT6820DGG,518 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CBT6820DGG,518?
CBT6820DGG,518 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CBT6820DGG,518 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 CBT6820DGG,518?
For technical support, including CBT6820DGG,518 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CBT6820DGG,518 requirements.
6.How does Aetrix verify that CBT6820DGG,518 is sourced from the original manufacturer or authorized distributors?
All CBT6820DGG,518 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 CBT6820DGG,518 meets industry standards.
7.What is the process for return or replacement of CBT6820DGG,518?
All CBT6820DGG,518 units undergo pre-shipment inspection (PSI). If there is an issue with CBT6820DGG,518, 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 CBT6820DGG,518 part is unused and in its original packaging.
Return procedure for CBT6820DGG,518:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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