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Home > Products > Integrated Circuits (ICs) > Logic > Signal Switches, Multiplexers, Decoders

Texas Instruments SN74CBTK16245DL

Name: SN74CBTK16245DL
Brand: Texas Instruments
SKU: SN74CBTK16245DL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74CBTK16245DL

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 48-BSSOP (0.295", 7.50mm Width)

Datasheet:: SN74CBTK16245DL.pdf

Description:: IC BUS SWITCH 8 X 1:1 48SSOP

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Product details

Overview

SN74CBTK16245DL from Texas Instruments is a 16-bit FET bus switch with active-clamp undershoot protection, designed for high-speed TTL-compatible bidirectional data routing in memory and peripheral interfaces. It features 5-Ω on-state resistance, I_off partial-power-down support, and clamps I/O undershoots to –2 V. Used in hot-swap-capable backplane and FPGA I/O expansion systems.

For engineers reviewing the SN74CBTK16245DL datasheet, SN74CBTK16245DL pinout, SN74CBTK16245DL application, or SN74CBTK16245DL equivalent, key selection criteria include undershoot tolerance (–2 V), low on-resistance (5 Ω typ), dual 8-bit independent enable control, I_off leakage (<20 µA), and SSOP-48 package compatibility with legacy '16245 layouts.

Technical Context

The SN74CBTK16245DL implements two independent 8-bit FET-based transmission gates, each controlled by a dedicated OE input (1OE and 2OE), enabling selective isolation of A↔B data paths without affecting adjacent channels. Its active-clamp circuit injects current from V_CC during I/O undershoot events, preventing pass-transistor turn-on and maintaining signal integrity below ground.

It operates across 4 V to 5.5 V V_CC, supports TTL-compatible input thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2 V), and guarantees latch-up immunity >100 mA per JESD78 Class II. The device's 0.25 ns typical propagation delay (at V_CC = 5 V) and 5.5 pF off-state capacitance minimize timing skew and capacitive loading in high-frequency buses.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	4 V to 5.5 V - Ensures compatibility with 5-V TTL and mixed-voltage I/O domains.
r_on (Typ)	5 Ω - Enables <1 ns propagation delay and minimal voltage drop under 64-mA switching current.
Undershoot Clamp	–2 V - Active-clamp circuit prevents sub-ground transients from turning on internal FETs or damaging downstream logic.
I_off Leakage	20 µA max at V_CC = 0 V - Allows safe partial power-down without backdrive current into powered sections.
Propagation Delay	0.25 ns (V_CC = 5 V) - Supports >1 GHz effective bus switching rates in point-to-point configurations.
ESD Rating	2000-V HBM - Meets industrial-level ESD robustness without external protection diodes.
Operating Temp	–40°C to +85°C - Qualified for commercial and extended-temperature embedded control applications.

Pinout & Package

SN74CBTK16245DL uses a 48-pin SSOP (Shrink Small-Outline Package) with 0.635-mm lead pitch, JEDEC MO-153 compliant, body dimensions 11.4 mm × 7.9 mm × 2.4 mm. Pin 1 located at top-left corner with index mark.

Pin/Terminal	Circuit Role	Design Meaning
1OE, 2OE	Independent Output Enable	Active-low enables for two 8-bit switch banks; allows granular bus segmentation and power-gating.
1A1–1A8, 2A1–2A8	Port A Inputs/Outputs	First and second 8-bit bidirectional data terminals connected to upstream logic or controller.
1B1–1B8, 2B1–2B8	Port B Inputs/Outputs	Corresponding 8-bit bidirectional terminals connected to memory, peripherals, or downstream devices.
V_CC (Pins 7, 18, 29, 40)	Power Supply	Four distributed V_CC pins reduce IR drop and improve noise immunity across high-speed switching.
GND (Pins 4, 11, 22, 33, 44)	Ground Reference	Five GND pins provide low-inductance return paths essential for undershoot clamp current routing.
NC (Pins 1, 48)	No Internal Connection	Reserved positions; must remain unconnected to avoid mechanical stress or unintended coupling.

Key Features

Feature	Design Value
Active-clamp undershoot protection	Clamps I/O to –2 V using V_CC-sourced current, eliminating need for external Schottky clamps in hot-swap designs.
Standard '16245 pinout	Drop-in replacement for legacy 74-series bus switches without PCB layout changes or signal re-routing.
I_off partial-power-down mode	Prevents backflow current when V_CC = 0 V, enabling safe insertion/removal in live backplanes and modular systems.
5-Ω low on-resistance	Minimizes RC delay and voltage droop, preserving signal edge rate and timing margin in 50-MHz+ parallel buses.
8-bit independent enable control	Enables selective isolation of memory vs. peripheral segments, reducing system-level contention and power domain conflicts.

Applications

Memory Interfacing	FPGA I/O Expansion
Use Scenario: Bidirectional data routing between microcontroller and SRAM/Flash in space-constrained embedded controllers. IC Role / Device Role: Low-latency, direction-agnostic bus switch isolating memory address/data lines during reset or power transitions. Use Value: 5-Ω r_on ensures <0.3 ns added delay; I_off prevents data corruption when memory is unpowered but controller remains active.	Use Scenario: Extending limited FPGA I/O pins to multiple peripheral modules (ADCs, DACs, sensors) via shared parallel bus. IC Role / Device Role: Configurable 16-bit channel selector enabling time-multiplexed access to heterogeneous peripherals. Use Value: Dual OE inputs allow independent gating of two 8-bit groups, simplifying arbitration logic and reducing FPGA resource usage.
Hot-Swap Backplane Interface	Legacy System Bus Bridging
Use Scenario: Protecting motherboard logic from transient undershoot during live insertion of mezzanine cards in industrial PLC racks. IC Role / Device Role: I/O buffer with active undershoot clamping on all 16 data lines, placed at card-edge connector interface. Use Value: –2 V undershoot clamp eliminates risk of false triggering or latch-up in downstream 5-V CMOS receivers during plug-in events.	Use Scenario: Interfacing modern microcontrollers with legacy ISA or PC/104 peripherals requiring TTL-level signaling and '16245-compatible timing. IC Role / Device Role: Pin-identical bus transceiver replacement supporting same control protocol and timing waveforms. Use Value: Standard '16245 pinout and function table ensure zero firmware or hardware redesign; 5.5-V absolute max rating accommodates older supply tolerances.

Memory Interfacing

FPGA I/O Expansion

Use Scenario: Bidirectional data routing between microcontroller and SRAM/Flash in space-constrained embedded controllers.

IC Role / Device Role: Low-latency, direction-agnostic bus switch isolating memory address/data lines during reset or power transitions.

Use Value: 5-Ω r_on ensures <0.3 ns added delay; I_off prevents data corruption when memory is unpowered but controller remains active.

Use Scenario: Extending limited FPGA I/O pins to multiple peripheral modules (ADCs, DACs, sensors) via shared parallel bus.

IC Role / Device Role: Configurable 16-bit channel selector enabling time-multiplexed access to heterogeneous peripherals.

Use Value: Dual OE inputs allow independent gating of two 8-bit groups, simplifying arbitration logic and reducing FPGA resource usage.

Hot-Swap Backplane Interface

Legacy System Bus Bridging

Use Scenario: Protecting motherboard logic from transient undershoot during live insertion of mezzanine cards in industrial PLC racks.

IC Role / Device Role: I/O buffer with active undershoot clamping on all 16 data lines, placed at card-edge connector interface.

Use Value: –2 V undershoot clamp eliminates risk of false triggering or latch-up in downstream 5-V CMOS receivers during plug-in events.

Use Scenario: Interfacing modern microcontrollers with legacy ISA or PC/104 peripherals requiring TTL-level signaling and '16245-compatible timing.

IC Role / Device Role: Pin-identical bus transceiver replacement supporting same control protocol and timing waveforms.

Use Value: Standard '16245 pinout and function table ensure zero firmware or hardware redesign; 5.5-V absolute max rating accommodates older supply tolerances.

Equivalent & Alternatives

The following parts are listed as comparable options for similar FET bus switch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBT16245DL	Lacks active-clamp undershoot protection; max undershoot tolerance –0.5 V only.	Suitable for non-hot-swap, fixed-installation systems where I/O transients are controlled.	Select when cost sensitivity outweighs transient robustness; verify system-level undershoot stays within –0.5 V limit.
SN74LVC16245ADGGR	CMOS-based, higher r_on (15 Ω), no undershoot clamp, but supports 1.65–3.6 V V_CC.	Better for low-voltage, battery-powered applications; incompatible with 5-V TTL signaling.	Choose for 3.3-V-only systems needing lower static power; not a drop-in replacement for 5-V environments.

Compared with SN74CBTK16245DL, SN74CBT16245DL offers identical pinout and speed but reduced transient immunity, while SN74LVC16245ADGGR provides voltage flexibility at the cost of on-resistance and undershoot protection-making SN74CBTK16245DL uniquely suited for robust 5-V hot-swap interfaces.

Availability

SN74CBTK16245DL is available at Aetrix Electronics and suitable for memory interfacing, FPGA I/O expansion, hot-swap backplane design, and legacy bus bridging requiring stable component supply and long-term obsolescence management.

Supply support for SN74CBTK16245DL 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 logic solutions, with over 90 years of innovation in industrial, automotive, and communications electronics.

The SN74CBTK16245DL belongs to TI's Widebus™ family of high-speed logic devices, engineered specifically for low-latency, robust bidirectional bus switching in demanding real-time data path applications.

FAQ

What is the maximum undershoot voltage the SN74CBTK16245DL can safely clamp?

The SN74CBTK16245DL actively clamps I/O undershoots to –2 V, as verified in the undershoot characteristics table (VIKU = –2 V at V_CC = 5.5 V). This is achieved via an internal current-source circuit that draws from V_CC to hold the output above –2 V during transient negative excursions, protecting downstream receivers. The SN74CBTK16245DL maintains this rating across its full operating temperature range (–40°C to +85°C).

Does the SN74CBTK16245DL support partial-power-down operation?

Yes, the SN74CBTK16245DL fully supports partial-power-down via its I_off circuitry. When V_CC = 0 V, I_off limits leakage current to ≤20 µA regardless of input/output voltage (0–5.5 V), preventing damaging backflow current into powered sections of the system. This feature is explicitly validated per JESD78 Class II latch-up testing and is critical for hot-plug and modular system designs using the SN74CBTK16245DL.

What is the on-state resistance of the SN74CBTK16245DL and how does it affect signal integrity?

The SN74CBTK16245DL has a typical on-state resistance (r_on) of 5 Ω at V_CC = 4.5 V and I_I = 30 mA, with a maximum of 7 Ω. This low r_on minimizes voltage drop and RC delay-resulting in a typical propagation delay of 0.25 ns at 5 V-preserving edge rates and timing margins in high-speed parallel buses. Signal integrity benefits directly from this specification, as lower r_on reduces distortion and crosstalk in the SN74CBTK16245DL's 16-bit switched path.

Is the SN74CBTK16245DL pin-compatible with standard '16245 devices?

Yes, the SN74CBTK16245DL uses the standard '16245-type pinout as confirmed in the device description and top-side marking (CBTK16245). It shares identical pin assignments for A/B ports, OE controls, V_CC, and GND with legacy 74ACT16245 and 74ALVC16245 variants. This allows direct PCB-level replacement without layout modification, provided system-level requirements (e.g., undershoot protection, I_off) align with the SN74CBTK16245DL's enhanced feature set.

What package type and RoHS status does the SN74CBTK16245DL use?

The SN74CBTK16245DL is supplied in a 48-pin SSOP (DL) package with 0.635-mm lead pitch, JEDEC MO-153 compliant. It carries a Green (RoHS & no Sb/Br) eco-plan designation, with CU NIPDAU lead finish and MSL Level-1 (260°C, unlimited floor life). This packaging meets industrial environmental compliance requirements and supports standard reflow profiles without moisture sensitivity concerns for the SN74CBTK16245DL.

SN74CBTK16245DL Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74CBTK

Package/Case:: 48-BSSOP (0.295", 7.50mm Width)

Packaging:: Tube

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-SSOP

SN74CBTK16245DL FAQ

1.How can I place an order for SN74CBTK16245DL through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74CBTK16245DL 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 SN74CBTK16245DL reliable?

The price and inventory of SN74CBTK16245DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTK16245DL is usually 5 days.

3.What payment methods are accepted for SN74CBTK16245DL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBTK16245DL transactions.

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4.How is shipping managed for SN74CBTK16245DL?

SN74CBTK16245DL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74CBTK16245DL 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 SN74CBTK16245DL?

For technical support, including SN74CBTK16245DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTK16245DL requirements.

6.How does Aetrix verify that SN74CBTK16245DL is sourced from the original manufacturer or authorized distributors?

All SN74CBTK16245DL 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 SN74CBTK16245DL meets industry standards.

7.What is the process for return or replacement of SN74CBTK16245DL?

All SN74CBTK16245DL units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTK16245DL, 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 SN74CBTK16245DL part is unused and in its original packaging.

Return procedure for SN74CBTK16245DL:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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