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Texas Instruments SN74CBT16245CDLR
- Part No.:
- SN74CBT16245CDLR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBT16245CDLR.pdf
- Description:
- IC BUS SWITCH 8 X 1:1 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,864
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Product details
Overview
SN74CBT16245CDLR from Texas Instruments is a 16-bit bidirectional FET bus switch IC with near-zero propagation delay (0.15 ns at 5 V), 3 Ω typical ON-state resistance, 5.5 pF typical OFF-state I/O capacitance, and undershoot protection up to −2 V on A/B ports - used for PCI interface isolation and memory interleaving in industrial backplanes.
For engineers reviewing the SN74CBT16245CDLR datasheet, SN74CBT16245CDLR pinout, SN74CBT16245CDLR application, or SN74CBT16245CDLR equivalent, key selection criteria include bidirectional low-distortion signal gating, partial-power-down support via Ioff, 4–5.5 V VCC operation, and compatibility with 0.8–5 V signaling levels across mixed-voltage systems.
Technical Context
The SN74CBT16245CDLR implements two independent 8-bit FET bus switches, each controlled by dedicated OE inputs (1OE, 2OE), enabling selective 16-bit or dual-8-bit operation. Its active undershoot-protection circuitry senses sub-0 V transients on A/B ports and forces the switch into a guaranteed OFF state without latch-up.
It supports true bidirectional data flow with no direction control pin, relies on voltage-driven enable logic (VIL ≤ 0.8 V, VIH ≥ 2 V), and features Ioff circuitry that limits backflow current to 10 µA when VCC = 0 V - ensuring isolation during partial power-down in hot-swap or multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - supports legacy 5 V TTL and mixed-voltage system rails |
| ron (Typ) | 3 Ω - minimizes voltage drop and signal attenuation under 64 mA load |
| tpd (Max) | 0.24 ns at 4 V - enables high-speed data transfer with sub-nanosecond timing integrity |
| Cio(OFF) (Typ) | 5.5 pF - reduces capacitive loading and preserves signal edge rate on isolated buses |
| Ioff (Max) | 10 µA at VCC = 0 V - prevents damaging current injection during power sequencing |
| Undershoot Protection | −2 V on A/B ports - protects against negative transients during hot-plug or bus contention |
| VI/O Range | 0 V to 5.5 V - interoperates with 0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, and 5 V logic families |
Pinout & Package
SN74CBT16245CDLR is housed in a 48-pin SSOP (DL) package, 12.4 mm × 6.2 mm × 2.4 mm body size, with 0.5 mm pitch, JEDEC MO-153 compliant, and rated for −40°C to 85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Output-enable control inputs | Active-low enables corresponding 8-bit switch; tie to VCC via pullup for power-up high-impedance safety |
| 1A1–1A8, 2A1–2A8 | Port A data terminals | First and second 8-bit input/output channels; bidirectionally connected to B-side when OE low |
| 1B1–1B8, 2B1–2B8 | Port B data terminals | Complementary 8-bit I/O channels; electrically identical to A-side with no direction bias |
| VCC, GND | Power supply pins | Single 4–5.5 V supply; 10× GND pins distributed for low-noise switching and thermal dissipation |
| NC | No internal connection | Pins 1 and 48 - must remain unconnected; no routing or grounding required |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional zero-direction-control switching | Eliminates need for external direction logic or dual-data-path routing in bus isolation designs |
| Active undershoot protection | Guarantees OFF-state retention during −2 V transients - critical for PCI and hot-swap reliability |
| Ioff partial-power-down support | Blocks backflow current to powered-down sections, enabling safe rail sequencing in multi-voltage systems |
| Low 5.5 pF OFF-state capacitance | Preserves signal integrity and bandwidth on high-speed buses by minimizing stub loading |
| TTL/CMOS-compatible control inputs | Accepts 3.3 V or 5 V CMOS and standard TTL logic levels without level-shifting circuitry |
Applications
| PCI Bus Isolation | Memory Interleaving |
|---|---|
Use Scenario: Isolating PCI add-in card data lines from motherboard during hot-plug insertion or fault conditions. IC Role / Device Role / Timing Role: Bidirectional bus switch providing galvanic separation while maintaining signal fidelity and timing transparency. Use Value: Prevents bus contention and ground bounce during insertion; undershoot protection avoids false triggering on −2 V transients. | Use Scenario: Routing parallel address/data between dual memory banks in high-bandwidth embedded controllers. IC Role / Device Role / Timing Role: Low-latency 16-bit data path selector enabling alternating bank access without direction control overhead. Use Value: Near-zero propagation delay (0.15 ns) ensures cycle-accurate interleaving; 3 Ω ron maintains signal amplitude across 64 mA loads. |
| Low-Distortion Signal Gating | Multi-Voltage Domain Interface |
Use Scenario: Enabling/disabling analog or digital sensor signals in test equipment where signal integrity is critical. IC Role / Device Role / Timing Role: Analog-capable FET switch with flat frequency response and minimal harmonic distortion. Use Value: 5.5 pF Cio(OFF) and 14 pF Cio(ON) limit phase shift and ringing; supports DC to >500 MHz operation. | Use Scenario: Bridging 1.8 V FPGA I/O to 3.3 V peripheral interfaces in portable industrial controllers. IC Role / Device Role / Timing Role: Level-agnostic bidirectional translator with no internal level-shifting circuitry required. Use Value: Supports 0–5 V signaling on A/B ports independently of VCC; eliminates external voltage translators and associated BOM cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD16245CDLR | Includes series 12 Ω resistors on all I/Os for ESD robustness; higher ron (15 Ω typ); same pinout and control logic | Better suited for environments with frequent ESD exposure but sacrifices signal rise time and drive strength | Select SN74CBTD16245CDLR only if JESD22-A114-B >2 kV HBM margin is required beyond baseline SN74CBT16245CDLR performance |
| SN74LVC16245ADGGR | 3.3 V-only operation (1.65–3.6 V); CMOS-based; higher Cio(OFF) (12 pF); no undershoot protection | Designed for low-voltage portable systems; lacks −2 V transient immunity and Ioff capability | Choose SN74LVC16245ADGGR only for cost-sensitive 3.3 V-only designs where undershoot and partial-power-down are not design constraints |
Compared with SN74CBTD16245CDLR and SN74LVC16245ADGGR, the SN74CBT16245CDLR uniquely balances ultra-low ron, sub-ns propagation, −2 V undershoot immunity, and full 4–5.5 V operation - making it the only option qualified for industrial PCI backplane isolation with mixed-voltage interoperability.
Availability
SN74CBT16245CDLR is available at Aetrix Electronics and suitable for PCI interface isolation, memory interleaving, and low-distortion signal gating requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant SSOP packaging.
Supply support for SN74CBT16245CDLR 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 industrial and automotive components.
The SN74CBT16245CDLR belongs to TI's Widebus™ family of high-speed FET bus switches, engineered specifically for low-latency, low-distortion bidirectional data routing in mixed-signal and multi-rail computing infrastructure.
FAQ
What is the maximum undershoot voltage the SN74CBT16245CDLR can withstand on its A and B ports?
The SN74CBT16245CDLR provides active undershoot protection up to −2 V on both A and B ports, verified per test conditions in the SCDS139 datasheet. This protection operates independently of VCC and ensures the switch remains in a guaranteed OFF state during transient negative excursions - a critical feature for PCI hot-plug and bus contention scenarios. The SN74CBT16245CDLR achieves this via integrated sensing circuitry that disables conduction before latch-up occurs.
Does the SN74CBT16245CDLR support partial-power-down operation, and how is it implemented?
Yes, the SN74CBT16245CDLR supports partial-power-down operation through its Ioff feature, which limits backflow current to 10 µA maximum when VCC = 0 V and I/O voltages range from 0 V to 5.5 V. This behavior is specified in the absolute maximum ratings and electrical characteristics tables of the SCDS139 datasheet. The SN74CBT16245CDLR uses internal circuitry to disable current paths during power-off, preventing damage to powered-down sections - essential for hot-swap and multi-rail system designs.
What is the typical ON-state resistance (ron) of the SN74CBT16245CDLR, and how does it affect signal integrity?
The SN74CBT16245CDLR has a typical ON-state resistance of 3 Ω at VCC = 4.5 V and IO = 30 mA, with a maximum of 6 Ω across temperature and voltage ranges. This low ron minimizes voltage drop and power loss across the switch, preserving signal amplitude and reducing jitter in high-speed digital paths. As confirmed in the SCDS139 datasheet's electrical characteristics table, the SN74CBT16245CDLR maintains consistent ron across all 16 channels, enabling uniform timing behavior in parallel bus applications.
Can the SN74CBT16245CDLR interface between different logic voltage levels, such as 1.8 V and 5 V?
Yes, the SN74CBT16245CDLR supports 0–5 V signaling on its A and B I/O ports regardless of VCC (4–5.5 V), enabling direct 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 without external level shifters. This capability is explicitly stated in the "Data I/Os Support 0 to 5-V Signaling Levels" section of the SCDS139 datasheet. The SN74CBT16245CDLR achieves this via passive FET architecture with no internal voltage translation - making it ideal for mixed-voltage board-level interconnects.
What package type and dimensions does the SN74CBT16245CDLR use, and is it RoHS-compliant?
The SN74CBT16245CDLR uses a 48-pin SSOP (DL) package measuring 12.4 mm × 6.2 mm × 2.4 mm with 0.5 mm pitch, compliant with JEDEC MO-153. It is RoHS-compliant with NIPDAU lead finish and MSL Level-1 rating (260°C peak reflow). This information is confirmed in TI's Package Option Addendum and mechanical drawings (MPDS006C). The SN74CBT16245CDLR's tape-and-reel packaging (1000 units per reel) supports automated SMT assembly in high-volume manufacturing environments.
SN74CBT16245CDLR 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:
- Active
- Type:
- Bus Switch
- Circuit:
- 8 x 1:1
- Independent Circuits:
- 2
- 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-SSOP
SN74CBT16245CDLR FAQ
1.How can I place an order for SN74CBT16245CDLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT16245CDLR 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 SN74CBT16245CDLR reliable?
The price and inventory of SN74CBT16245CDLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT16245CDLR is usually 5 days.
3.What payment methods are accepted for SN74CBT16245CDLR?
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4.How is shipping managed for SN74CBT16245CDLR?
SN74CBT16245CDLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT16245CDLR 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 SN74CBT16245CDLR?
For technical support, including SN74CBT16245CDLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT16245CDLR requirements.
6.How does Aetrix verify that SN74CBT16245CDLR is sourced from the original manufacturer or authorized distributors?
All SN74CBT16245CDLR 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 SN74CBT16245CDLR meets industry standards.
7.What is the process for return or replacement of SN74CBT16245CDLR?
All SN74CBT16245CDLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT16245CDLR, 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 SN74CBT16245CDLR part is unused and in its original packaging.
Return procedure for SN74CBT16245CDLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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