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Texas Instruments SN74CBTK16245DGGR
- Part No.:
- SN74CBTK16245DGGR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
SN74CBTK16245DGGR.pdf
- Description:
- IC BUS SWITCH 8 X 1:1 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,817
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Product details
Overview
SN74CBTK16245DGGR from Texas Instruments is a 16-bit FET bus switch with active-clamp undershoot protection, TTL-compatible inputs, 5-Ω on-state resistance, Ioff support for partial-power-down operation, and rated for –40°C to 85°C. It enables bidirectional data flow between A and B ports in high-speed digital backplanes and memory expansion interfaces.
For engineers reviewing the SN74CBTK16245DGGR datasheet, SN74CBTK16245DGGR pinout, SN74CBTK16245DGGR application, or SN74CBTK16245DGGR equivalent, key selection criteria include undershoot clamping to –2 V, 0.25 ns propagation delay at 5 V, dual independent OE control, TSSOP-48 package thermal resistance (70°C/W), and JESD 78 Class II latch-up immunity.
Technical Context
The SN74CBTK16245DGGR implements two independent 8-bit low-impedance FET switches, each controlled by its own output-enable (OE) input. Its active-clamp circuit supplies current from VCC to clamp I/O undershoots down to –2 V, preventing pass-transistor turn-on during transient negative excursions.
It supports partial-power-down via Ioff circuitry that disables outputs when VCC = 0 V, blocking damaging backflow current. The device uses standard '16245-type pinout and operates across 4 V to 5.5 V supply range with TTL-level control thresholds (VIL ≤ 0.8 V, VIH ≥ 2 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at VCC = 4.5 V - ensures minimal voltage drop and signal distortion in high-current data paths. |
| Propagation delay (tpd) | 0.25 ns at VCC = 5 V - enables sub-nanosecond timing integrity in DDR and high-speed parallel buses. |
| Undershoot clamp threshold | –2 V minimum - actively protects downstream logic from negative transients exceeding –2 V without external diodes. |
| Ioff leakage current | 20 µA max at VCC = 0 V - guarantees safe isolation during hot-swap or partial power-down sequences. |
| Supply voltage range | 4 V to 5.5 V - compatible with 5-V TTL and mixed-voltage system domains requiring robust rail tolerance. |
| Latch-up immunity | >100 mA per JESD 78 Class II - prevents destructive latch-up under ESD or fault conditions in industrial environments. |
| ESD protection | 2000-V HBM, 200-V MM, 1000-V CDM - meets stringent board-level ESD requirements without external protection. |
Pinout & Package
TSSOP-48 package (JEDEC MO-153 compliant), 6.2 mm × 12.6 mm body, 0.5 mm pitch, 1.2 mm max height, RoHS-compliant green finish (CU NIPDAU), MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Independent output-enable controls | Each enables/disables one 8-bit switch section; low = on (A↔B connected), high = high-Z isolation. |
| 1A1–1A8, 2A1–2A8 | Port A inputs/outputs | First and second 8-bit data terminals on A side; bidirectional with no direction pin required. |
| 1B1–1B8, 2B1–2B8 | Port B inputs/outputs | Corresponding 8-bit terminals on B side; electrically identical to A ports for true bidirectional switching. |
| VCC (Pins 7, 18, 29, 40) | Power supply | Four distributed VCC pins reduce IR drop and improve noise immunity across wide bus widths. |
| GND (Pins 4, 11, 22, 33, 44) | Ground reference | Five GND pins provide low-inductance return paths essential for clean switching of 16-bit signals. |
| NC (Pins 1, 48) | No internal connection | Reserved for mechanical stability; must remain unconnected to avoid unintended coupling or EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Active-clamp undershoot protection | Clamps I/O to –2 V using VCC-sourced current - eliminates need for external Schottky clamps in noisy backplane designs. |
| 5-Ω low on-state resistance | Minimizes insertion loss and signal rise/fall time degradation - preserves edge integrity in >100 MHz parallel buses. |
| Ioff partial-power-down support | Blocks reverse current flow when VCC = 0 - enables safe hot-plug operation in modular computing and telecom systems. |
| Standard '16245 pinout compatibility | Direct PCB footprint replacement for legacy 74-series bus switches - reduces redesign effort and layout risk. |
| TTL-compatible control inputs | Accepts 0.8 V / 2.0 V logic thresholds - interoperates seamlessly with 5-V microcontrollers, FPGAs, and ASICs without level shifters. |
Applications
| Memory Expansion Interface | Hot-Swappable Backplane |
|---|---|
|
Use Scenario: Adding SRAM or Flash memory modules to embedded controllers with shared address/data buses. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating memory module from main processor bus during insertion/removal. Use Value: Active-clamp protection prevents undershoot-induced corruption of stored data during hot-swap events. |
Use Scenario: Modular telecom line cards connecting to a central backplane with live power and signal presence. IC Role / Device Role / Timing Role: Isolating card-specific logic from backplane signals until full mechanical and electrical engagement is confirmed. Use Value: Ioff mode blocks backfeed current when card VCC is unpowered, protecting backplane regulators and other modules. |
| High-Speed Parallel Test Equipment | Legacy Bus Signal Multiplexing |
|
Use Scenario: Automated test systems routing multiple DUT signals through shared high-bandwidth measurement channels. IC Role / Device Role / Timing Role: Low-ron, low-tpd switch enabling nanosecond-accurate signal path selection without skew. Use Value: 5-Ω ron and 0.25 ns tpd preserve signal fidelity for 100+ MHz digital pattern generation and capture. |
Use Scenario: Consolidating multiple ISA or PCI-like peripheral buses onto a single controller with dynamic arbitration. IC Role / Device Role / Timing Role: Enabling/disabling bus segments under software control to prevent contention and reduce loading. Use Value: Dual OE inputs allow independent gating of two 8-bit lanes - simplifies arbitration logic and reduces gate count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT16245DGGR | Omits active-clamp undershoot protection; ron = 6 Ω typical; same pinout and Ioff support. | Suitable only in benign EMI environments where undershoot is mitigated externally. | Select SN74CBT16245DGGR if undershoot risk is absent and cost sensitivity outweighs protection requirement. |
| SN74LVC16245ADGGR | 3.3-V CMOS device; 3.3-V logic levels; no undershoot clamping; higher ron (~15 Ω); different pinout. | Requires level-shifting for 5-V systems; not drop-in replaceable due to voltage and pin mismatch. | Choose SN74LVC16245ADGGR only for new 3.3-V designs with no legacy 5-V interface constraints. |
Compared with SN74CBTK16245DGGR, SN74CBT16245DGGR sacrifices undershoot protection for lower cost but retains pin compatibility, while SN74LVC16245ADGGR shifts to 3.3-V operation with incompatible logic thresholds and higher conduction loss - neither offers direct functional or physical replacement without design revision.
Availability
SN74CBTK16245DGGR is available at Aetrix Electronics and suitable for memory expansion interfaces, hot-swappable backplanes, high-speed parallel test equipment, and legacy bus signal multiplexing requiring stable component supply and long-term lifecycle continuity.
Supply support for SN74CBTK16245DGGR 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 logic solutions with emphasis on reliability, precision, and industrial-grade performance.
The SN74CBTK16245DGGR belongs to TI's Widebus™ family of high-speed logic devices, engineered specifically for robust signal integrity in 5-V digital interconnects subject to EMI, hot-swap, and mixed-voltage interface challenges.
FAQ
What is the maximum undershoot voltage the SN74CBTK16245DGGR can safely clamp?
The SN74CBTK16245DGGR features an active-clamp undershoot-protection circuit that clamps I/O voltages down to –2 V minimum, as verified under JESD 22 test conditions. This capability prevents pass-transistor turn-on during negative transients and eliminates the need for external clamping diodes in the SN74CBTK16245DGGR signal path.
Does the SN74CBTK16245DGGR support partial-power-down operation?
Yes, the SN74CBTK16245DGGR fully supports partial-power-down via its Ioff circuitry. When VCC = 0 V, the Ioff feature disables all outputs and limits leakage current to 20 µA maximum, preventing damaging reverse current flow - a critical capability for hot-swap and modular system designs using the SN74CBTK16245DGGR.
What is the on-state resistance of the SN74CBTK16245DGGR and how does it affect signal integrity?
The SN74CBTK16245DGGR has a typical on-state resistance (ron) of 5 Ω at VCC = 4.5 V. This low resistance minimizes voltage drop and signal attenuation across the switch, preserving rise/fall times and reducing jitter in high-speed parallel buses - directly enhancing timing margin and data validity in systems deploying the SN74CBTK16245DGGR.
Is the SN74CBTK16245DGGR pin-compatible with standard '16245 devices?
Yes, the SN74CBTK16245DGGR uses the standard '16245-type pinout and is mechanically and electrically compatible with legacy 74-series bus switches in TSSOP-48 packaging. This allows direct PCB footprint replacement without layout changes, making the SN74CBTK16245DGGR ideal for upgrading existing designs with enhanced undershoot protection and Ioff functionality.
What is the operating temperature range for the SN74CBTK16245DGGR?
The SN74CBTK16245DGGR is specified for operation from –40°C to +85°C ambient temperature, meeting industrial-grade environmental requirements. This range ensures reliable performance in demanding applications such as telecom infrastructure, industrial control, and automated test equipment where the SN74CBTK16245DGGR is commonly deployed.
SN74CBTK16245DGGR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTK
- Package/Case:
- 48-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Bus Switch
- Circuit:
- 8 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-TSSOP
SN74CBTK16245DGGR FAQ
1.How can I place an order for SN74CBTK16245DGGR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTK16245DGGR 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 SN74CBTK16245DGGR reliable?
The price and inventory of SN74CBTK16245DGGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTK16245DGGR is usually 5 days.
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SN74CBTK16245DGGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTK16245DGGR 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 SN74CBTK16245DGGR?
For technical support, including SN74CBTK16245DGGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTK16245DGGR requirements.
6.How does Aetrix verify that SN74CBTK16245DGGR is sourced from the original manufacturer or authorized distributors?
All SN74CBTK16245DGGR 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 SN74CBTK16245DGGR meets industry standards.
7.What is the process for return or replacement of SN74CBTK16245DGGR?
All SN74CBTK16245DGGR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTK16245DGGR, 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 SN74CBTK16245DGGR part is unused and in its original packaging.
Return procedure for SN74CBTK16245DGGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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