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Texas Instruments SN74CBT16800CDL
- Part No.:
- SN74CBT16800CDL
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBT16800CDL.pdf
- Description:
- IC BUS SWITCH 10 X 1:1 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:375
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Product details
Overview
SN74CBT16800CDL from Texas Instruments is a 20-bit (dual 10-bit) FET bus switch IC with bidirectional signal routing, 3 Ω typical ON-state resistance, −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 SN74CBT16800CDL datasheet, SN74CBT16800CDL pinout, SN74CBT16800CDL application, or SN74CBT16800CDL equivalent, key selection criteria include its 4–5.5 V VCC operation, 5.5 pF OFF-state I/O capacitance, Ioff partial-power-down support, and SSOP-48 package compatibility with industrial bus isolation and memory interleaving designs.
Technical Context
The SN74CBT16800CDL implements two independent 10-bit FET bus switches, each controlled by dedicated OE inputs (1OE, 2OE), enabling either dual 10-bit or single 20-bit configuration. Its internal switch architecture uses low-threshold FETs with active undershoot-protection circuitry that clamps A/B port voltages down to −2 V while maintaining OFF-state integrity.
B-port terminals are precharged to an externally supplied BIASV voltage (0–VCC) through an internal ~10-kΩ path during high-OE or VCC = 0 conditions, minimizing signal distortion during hot-plug events. The device supports 0–5.5 V data signaling across all I/Os and features Ioff protection to block backflow current during partial power-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - Ensures compatibility with 5-V TTL and mixed-voltage systems including 3.3-V/5-V interface translation. |
| ron (Typ) | 3 Ω - Delivers near-zero propagation delay (<0.24 ns at 4 V) and minimal signal attenuation in high-speed digital paths. |
| Cio(OFF) | 5.5 pF typical - Reduces capacitive loading on shared buses, preserving signal edge rates and timing margins. |
| Undershoot Protection | −2 V on A/B ports - Prevents false triggering or latch-up when hot-inserted cards pull bus lines below ground. |
| Ioff | 10 µA max at VCC = 0 - Enables safe isolation of powered-down sections without damaging current flow into inactive domains. |
| BIASV Range | 0 V to VCC - Allows user-selectable precharge level matching receiver input thresholds (e.g., 2.4 V for 3.3-V LVTTL). |
| Propagation Delay | 0.15 ns typical at 5 V - Supports >5 GHz effective switching bandwidth in point-to-point or stubbed bus topologies. |
Pinout & Package
SN74CBT16800CDL is housed in a 48-pin SSOP (DL) package, 12.6 mm × 6.2 mm × 1.2 mm, with 0.5-mm lead pitch and gull-wing terminations suitable for automated SMT assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A10, 2A1–2A10 | A-side data inputs/outputs | Bidirectional I/O pins for first and second 10-bit switch banks; tolerate 0–5.5 V signals regardless of VCC. |
| 1B1–1B10, 2B1–2B10 | B-side data inputs/outputs | Bidirectional I/O pins precharged to BIASV when OE is high or VCC = 0, suppressing live-insertion glitches. |
| 1OE, 2OE | Output-enable controls | Active-low enables; must be pulled up to VCC via external resistor to ensure high-Z state during power sequencing. |
| BIASV | Bias supply input | User-supplied voltage (0–VCC) setting precharge level for all B-port pins; critical for noise-immune hot-plug operation. |
| VCC, GND (×5) | Power and ground distribution | Multiple VCC/GND pairs minimize switching noise and ensure stable operation across full 20-bit channel count. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional zero-delay switching | Enables transparent signal pass-through in both directions with <0.24 ns propagation delay, eliminating direction-control logic overhead. |
| Live-insertion noise suppression | B-port precharge to BIASV minimizes transient excursions during card insertion, preventing false logic transitions on active backplanes. |
| PCI Hot Plug compliance | Integrated undershoot protection (−2 V), Ioff, and BIASV precharge meet electrical requirements for PCI Local Bus Revision 2.2 hot-plug systems. |
| Mixed-signal voltage tolerance | 0–5.5 V I/O support allows direct interfacing with 0.8-V to 5-V logic families without level shifters in memory or peripheral expansion paths. |
| Partial-power-down robustness | Ioff limits leakage to 10 µA when VCC = 0, permitting safe integration into systems with staggered power-rail sequencing or standby modes. |
Applications
| PCI Hot-Plug Backplane | Memory Interleaving Interface |
|---|---|
Use Scenario: Inserting/removing add-in cards into live 32-bit or 64-bit PCI slots without disrupting system operation. IC Role / Device Role / Timing Role: Bus switch isolating card-side signals from main backplane; BIASV set to match receiver threshold (e.g., 2.4 V) to suppress insertion transients. Use Value: Eliminates need for external clamping diodes or complex sequencing controllers, reducing BOM count and PCB area in modular computing systems. |
Use Scenario: Dynamically routing address/data between two DDR SDRAM banks operating at different timings or refresh cycles. IC Role / Device Role / Timing Role: Low-latency bidirectional gate enabling bank-select multiplexing with sub-nanosecond delay and no direction control overhead. Use Value: Maintains tight tAC/tCO timing budgets across interleaved memory channels while supporting independent power gating per bank. |
| Industrial I/O Expansion Module | Legacy Bus Isolation Bridge |
Use Scenario: Adding isolated digital I/O channels to PLC CPU modules using field-wirable terminal blocks with potential ground offset or ESD events. IC Role / Device Role / Timing Role: Signal-level isolator between microcontroller GPIO and ruggedized I/O drivers; leverages −2 V undershoot protection against cable-induced transients. Use Value: Prevents controller lockup or data corruption during field maintenance, extending mean time between failures in harsh factory environments. |
Use Scenario: Connecting ISA or LPC peripherals to modern SoC-based controllers where bus voltage or timing incompatibilities exist. IC Role / Device Role / Timing Role: Voltage-agnostic bus buffer decoupling legacy 5-V peripherals from 3.3-V or 1.8-V host interfaces while preserving signal integrity. Use Value: Enables drop-in replacement of aging motherboards without redesigning peripheral firmware or altering timing constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD16210DGGR | 16-bit, 3-state output with separate DIR control; higher ron (5 Ω typ); no BIASV precharge. | Lacks live-insertion optimization; suited for static bus buffering rather than hot-plug systems. | Select when direction control is required and undershoot immunity is secondary to cost or footprint. |
| SN74CB3Q3257PWR | 4-channel 2:1 multiplexer; 4.5 Ω ron; supports 1.65–5.5 V; no undershoot protection or BIASV. | Designed for signal routing, not bus isolation; limited channel count prevents 20-bit continuity. | Prefer for compact multiplexing in space-constrained designs where full bus-width switching is unnecessary. |
Compared with SN74CBT16800CDL, SN74CBTD16210DGGR offers direction control but sacrifices live-insertion robustness, while SN74CB3Q3257PWR provides voltage flexibility and smaller size at the expense of bus-width scalability and hot-plug readiness.
Availability
SN74CBT16800CDL is available at Aetrix Electronics and suitable for PCI hot-plug systems, memory interleaving architectures, industrial I/O expansion modules, and legacy bus isolation bridges requiring stable component supply across extended product lifecycles.
Supply support for SN74CBT16800CDL 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 industrial, automotive, and communications markets.
The SN74CBT16800CDL belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for low-distortion, hot-plug-capable signal gating in enterprise computing, telecom infrastructure, and programmable logic interconnect applications.
FAQ
What is the maximum undershoot voltage the SN74CBT16800CDL can withstand on its A and B ports?
The SN74CBT16800CDL 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 capability ensures reliable OFF-state retention and prevents false logic transitions during hot-plug events or cable-induced transients. The SN74CBT16800CDL maintains isolation even when port voltages dip below ground by 2 V, making it suitable for demanding backplane applications.
Does the SN74CBT16800CDL support mixed-voltage operation between 3.3-V and 5-V logic domains?
Yes, the SN74CBT16800CDL supports 0–5.5 V signaling on all data I/Os independent of VCC, enabling seamless interfacing between 0.8-V, 1.2-V, 1.5-V, 1.8-V, 2.5-V, 3.3-V, and 5-V logic families. Its VCC range (4–5.5 V) powers internal circuitry while data pins remain voltage-agnostic - a key feature confirmed in the recommended operating conditions table. This behavior is intrinsic to the SN74CBT16800CDL design and requires no external level-shifting components.
How does the BIASV pin function during live insertion, and what voltage should it be set to?
The BIASV pin supplies a user-defined bias voltage (0–VCC) used to precharge all B-port terminals through an internal ~10-kΩ path when OE is high or VCC = 0. During live insertion, this precharge minimizes voltage excursions across receiver input thresholds - typically set to match the input high threshold (VIH) of downstream devices (e.g., 2.4 V for 3.3-V LVTTL). The SN74CBT16800CDL datasheet confirms BIASV's role in reducing glitch amplitude and duration, directly improving system robustness in hot-plug scenarios.
Is the SN74CBT16800CDL compatible with partial-power-down modes, and how is Ioff implemented?
Yes, the SN74CBT16800CDL fully supports partial-power-down operation via its Ioff feature, which limits leakage 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 transistor cutoff mechanisms that prevent damaging backflow current from powered sections into unpowered ones. The SN74CBT16800CDL meets JESD 78 Class II latch-up immunity (>100 mA), ensuring safe integration into systems with staggered rail sequencing or standby states.
What package type and dimensions does the SN74CBT16800CDL use, and is it RoHS-compliant?
The SN74CBT16800CDL uses a 48-pin SSOP (DL) package measuring 12.6 mm × 6.2 mm × 1.2 mm with 0.5-mm lead pitch and gull-wing leads. It is RoHS-compliant (lead-free NIPDAU finish) and rated MSL Level-1 (unlimited floor life at ≤30°C/60% RH). Package mechanical drawings and land patterns are documented in TI's MTSS003D and DGG0048A specifications - consistent across all production lots of the SN74CBT16800CDL.
SN74CBT16800CDL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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-SSOP
SN74CBT16800CDL FAQ
1.How can I place an order for SN74CBT16800CDL through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT16800CDL 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 SN74CBT16800CDL reliable?
The price and inventory of SN74CBT16800CDL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT16800CDL is usually 5 days.
3.What payment methods are accepted for SN74CBT16800CDL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT16800CDL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBT16800CDL?
SN74CBT16800CDL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT16800CDL 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 SN74CBT16800CDL?
For technical support, including SN74CBT16800CDL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT16800CDL requirements.
6.How does Aetrix verify that SN74CBT16800CDL is sourced from the original manufacturer or authorized distributors?
All SN74CBT16800CDL 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 SN74CBT16800CDL meets industry standards.
7.What is the process for return or replacement of SN74CBT16800CDL?
All SN74CBT16800CDL units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT16800CDL, 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 SN74CBT16800CDL part is unused and in its original packaging.
Return procedure for SN74CBT16800CDL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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