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Texas Instruments SN74CBT16800CDLR
- Part No.:
- SN74CBT16800CDLR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBT16800CDLR.pdf
- Description:
- IC BUS SWITCH 10 X 1:1 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,938
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Product details
Overview
SN74CBT16800CDLR 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 B-port precharge for live-insertion noise suppression, and support for 0–5-V signaling across mixed-voltage systems. It serves as a bidirectional signal gate in PCI hot-plug interfaces and memory interleaving paths.
For engineers reviewing the SN74CBT16800CDLR datasheet, SN74CBT16800CDLR pinout, SN74CBT16800CDLR application, or SN74CBT16800CDLR equivalent, key selection criteria include its Ioff partial-power-down capability, 0.15 ns propagation delay at 5 V, 5.5 pF OFF-state I/O capacitance, and SSOP-48 package compatibility with high-density board layouts.
Technical Context
This device implements two independent 10-bit FET bus switches with separate OE controls (1OE/2OE), enabling either dual 10-bit isolation or unified 20-bit switching. Each switch features active undershoot-protection circuitry that maintains OFF-state integrity when A/B port voltages dip to −2 V.
The B port is internally precharged to an externally supplied BIASV voltage (0–VCC) via a 10-kΩ equivalent resistor during OE-high or VCC=0 states, minimizing live-insertion glitches by holding B-port voltage near receiver input thresholds. Ioff functionality prevents backflow current during partial power-down, ensuring system-level isolation when VCC=0.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ON-state resistance (ron) | 3 Ω typical - enables minimal voltage drop and signal distortion under 64 mA load |
| Propagation delay (tpd) | 0.15 ns at VCC = 5 V - supports high-speed bidirectional data flow without timing penalty |
| I/O capacitance (Cio(OFF)) | 5.5 pF typical - reduces capacitive loading on buses and preserves signal edge integrity |
| Undershoot protection | −2 V on A/B ports - prevents false switching during transient negative excursions |
| BIASV range | 0 to VCC - allows precise matching to host bus receiver threshold (e.g., 2.4 V for 3.3-V LVTTL) |
| Ioff current | 10 µA max at VCC = 0 - blocks damaging back-current during partial power-down sequences |
| VCC operating range | 4 V to 5.5 V - compatible with standard 5-V TTL and mixed-supply industrial systems |
Pinout & Package
SN74CBT16800CDLR uses a 48-pin SSOP (DL) package with 0.5-mm pitch, 12.6 mm × 6.2 mm body size, and 1.2 mm max height. Pin 1 is marked in quadrant Q1 per tape-and-reel orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A10, 2A1–2A10 | A-side data inputs/outputs | Bidirectional signal terminals for first and second 10-bit buses; tolerate 0–5.5 V |
| 1B1–1B10, 2B1–2B10 | B-side data inputs/outputs | Bidirectional terminals precharged to BIASV when OE is high or VCC = 0 |
| 1OE, 2OE | Output-enable controls | Active-low enables for respective 10-bit sections; require pull-up to VCC for power-up safety |
| BIASV | Bias supply input | User-supplied voltage (0–VCC) setting precharge level on all B ports during disable/power-down |
| VCC, GND | Power and ground | Single 4–5.5 V supply; 12 dedicated GND pins distributed for low-noise operation |
Key Features
| Feature | Design Value |
|---|---|
| Live-insertion noise suppression | B-port precharge to BIASV eliminates glitching during hot-plug by avoiding receiver input-threshold crossing |
| PCI Hot Plug compliance | Validated undershoot protection (−2 V), Ioff, and BIASV control meet PCI SIG hot-plug electrical requirements |
| Mixed-voltage interface support | 0–5-V data I/O tolerance enables seamless bridging between 1.2-V, 1.8-V, 2.5-V, 3.3-V, and 5-V logic domains |
| Low-distortion signal gating | 3 Ω ron + 5.5 pF Cio(OFF) preserves rise/fall times and minimizes reflection-induced ringing |
| Partial-power-down robustness | Ioff < 10 µA at VCC = 0 ensures no backfeed path from powered B-bus into unpowered device |
Applications
| PCI Hot-Plug Interface | Memory Interleaving Bus |
|---|---|
Use Scenario: Inserting/removing expansion cards into live PCI backplanes without disrupting active bus traffic. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating card-side signals from main bus while precharging B-port to match receiver thresholds. Use Value: Eliminates insertion glitches by holding B-port voltage outside input threshold region, verified to −2 V undershoot. | Use Scenario: Dynamically routing address/data between multiple memory banks in high-bandwidth controllers. IC Role / Device Role / Timing Role: Low-latency (0.15 ns), low-ron signal gate enabling fast bank-select switching without skew or attenuation. Use Value: 3 Ω ron and 5.5 pF Cio(OFF) maintain signal integrity across 100+ MHz memory clocks with sub-nanosecond timing margins. |
| Low-Distortion Analog Signal Gating | Legacy System Voltage Translation |
Use Scenario: Enabling/disabling analog sensor or DAC output paths in mixed-signal test equipment. IC Role / Device Role / Timing Role: FET-based analog switch with rail-to-rail voltage handling (−0.5 V to 7 V) and minimal charge injection. Use Value: 5.5 pF OFF-capacitance and absence of CMOS latch-up risk allow clean AC-coupled signal pass-through up to 100 MHz. | Use Scenario: Interfacing 3.3-V FPGA I/O to legacy 5-V peripheral buses in industrial control modules. IC Role / Device Role / Timing Role: Level-shifting bus switch supporting simultaneous 0–5-V signaling on A/B ports without external level shifters. Use Value: Eliminates need for discrete translation logic; 4–5.5 V VCC and 0–5.5 V I/O tolerance ensure safe bidirectional voltage bridging. |
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, with 3.3-V-only VCC (3.0–3.6 V); no BIASV; higher ron (5 Ω) | Lacks live-insertion precharge and undershoot protection; limited to 3.3-V systems | Select only for cost-sensitive 3.3-V-only designs where hot-plug is not required |
| SN74CB3Q3257PWR | 4-channel 2:1 multiplexer; 4-bit configuration; 4-V to 5.5-V VCC; no BIASV or undershoot protection | Fixed 2:1 routing vs. configurable 10/20-bit bus switch; no hot-plug features | Use when channelized multiplexing is needed instead of full bus isolation |
Compared with SN74CBT16800CDLR, SN74CBTD16210DGGR omits BIASV and undershoot protection-making it unsuitable for hot-plug-but offers lower unit cost in 3.3-V-only systems; SN74CB3Q3257PWR provides multiplexing flexibility but lacks the 20-bit scalability, live-insertion hardening, and ultra-low ron critical for PCI and memory bus applications.
Availability
SN74CBT16800CDLR is available at Aetrix Electronics and suitable for PCI hot-plug interface design, memory interleaving subsystems, and mixed-voltage signal gating requiring stable component supply across industrial temperature ranges (−40°C to 85°C).
Supply support for SN74CBT16800CDLR 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, longevity, and industrial-grade performance.
The SN74CBT16800CDLR belongs to TI's Widebus™ family of high-speed FET bus switches, engineered specifically for hot-plug-capable, low-distortion, mixed-voltage bus isolation in computing and communications infrastructure.
FAQ
What is the maximum undershoot voltage the SN74CBT16800CDLR can withstand on its A and B ports?
The SN74CBT16800CDLR provides active undershoot protection up to −2 V on both A and B ports, verified per datasheet SCDS117C Section 4. This protection ensures the switch remains reliably OFF during transient negative excursions, preventing unintended conduction or bus contention in hot-plug scenarios. The SN74CBT16800CDLR achieves this via internal sensing circuitry that locks the FET gate during undershoot events.
How does the BIASV pin function in the SN74CBT16800CDLR during hot-plug operations?
The BIASV pin on the SN74CBT16800CDLR supplies a user-defined bias voltage (0 to VCC) used to precharge all B-port terminals through an internal ~10-kΩ equivalent resistor whenever OE is high or VCC = 0. During live insertion, this precharge holds B-port voltage near the input threshold of downstream receivers-typically set to 2.4 V for 3.3-V LVTTL-so that connector parasitic discharge does not cross the switching threshold and cause glitches. This behavior is explicitly validated for PCI Hot Plug compliance.
Can the SN74CBT16800CDLR operate with different supply and I/O voltage levels simultaneously?
Yes, the SN74CBT16800CDLR supports 0–5-V signaling on all data I/Os independent of VCC (4–5.5 V), enabling true mixed-voltage operation-for example, interfacing a 1.8-V FPGA core to a 5-V peripheral bus. Its data pins tolerate VI/O from −0.5 V to 7 V, and control inputs accept TTL- or CMOS-level signals (0.8-V to 5.5-V logic thresholds). This eliminates external level shifters in multi-rail systems, and the SN74CBT16800CDLR maintains specified ron and timing across all supported voltage combinations.
What is the purpose of the Ioff specification for the SN74CBT16800CDLR?
The Ioff specification (≤10 µA max at VCC = 0) ensures the SN74CBT16800CDLR blocks current backflow from powered B-side buses into an unpowered device-a critical requirement for partial-power-down systems. When VCC is removed while B-port signals remain active, Ioff prevents damaging reverse current paths through the FET channel, preserving system-level isolation and meeting JESD78 Class II latch-up immunity. This feature is integral to the SN74CBT16800CDLR's use in hot-swap controllers and modular backplane architectures.
Is the SN74CBT16800CDLR pin-compatible with other members of the SN74CBT16xxx family?
No-the SN74CBT16800CDLR has a unique 48-pin SSOP (DL) pinout optimized for dual 10-bit switching with dedicated BIASV, dual OE, and distributed GND/VCC. Devices like SN74CBT16210 (24-pin) or SN74CBT16212 (56-pin TSSOP) differ in channel count, enable structure, and pin mapping. Substituting requires PCB redesign. Always verify pin functions against the SN74CBT16800CDLR-specific top-view diagram in SCDS117C, as shared package codes (e.g., DL) do not imply pin compatibility across the CBT16xxx series.
SN74CBT16800CDLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 48-BSSOP (0.295", 7.50mm 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-SSOP
SN74CBT16800CDLR FAQ
1.How can I place an order for SN74CBT16800CDLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT16800CDLR 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 SN74CBT16800CDLR reliable?
The price and inventory of SN74CBT16800CDLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT16800CDLR is usually 5 days.
3.What payment methods are accepted for SN74CBT16800CDLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT16800CDLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBT16800CDLR?
SN74CBT16800CDLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT16800CDLR 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 SN74CBT16800CDLR?
For technical support, including SN74CBT16800CDLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT16800CDLR requirements.
6.How does Aetrix verify that SN74CBT16800CDLR is sourced from the original manufacturer or authorized distributors?
All SN74CBT16800CDLR 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 SN74CBT16800CDLR meets industry standards.
7.What is the process for return or replacement of SN74CBT16800CDLR?
All SN74CBT16800CDLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT16800CDLR, 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 SN74CBT16800CDLR part is unused and in its original packaging.
Return procedure for SN74CBT16800CDLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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