Texas Instruments SN74CBT16245CDL

Overview

SN74CBT16245CDL from Texas Instruments is a 16-bit bidirectional FET bus switch IC in SSOP-48 package, featuring near-zero propagation delay (0.15 ns at 5 V), 3 Ω typical ON-state resistance, and undershoot protection up to −2 V on both A and B ports. It supports 0–5-V signaling across mixed-voltage systems and enables bus isolation in PCI interfaces and memory interleaving applications.

For engineers reviewing the SN74CBT16245CDL datasheet, SN74CBT16245CDL pinout, SN74CBT16245CDL application, or SN74CBT16245CDL equivalent, key selection criteria include its dual 8-bit independent enable control (1OE/2OE), Ioff partial-power-down support, low 5.5 pF OFF-state I/O capacitance, and −40°C to 85°C industrial temperature range.

Technical Context

The SN74CBT16245CDL implements two independent 8-bit FET-based analog switches with TTL/CMOS-compatible control inputs. Each switch channel uses active undershoot-protection circuitry that detects −2 V transients and forces OFF-state isolation without latch-up.

Its architecture supports bidirectional signal flow with no direction pin; data path state is controlled solely by OE logic level. The device operates from 4 V to 5.5 V VCC and maintains high-impedance isolation during power sequencing when OE is pulled up to VCC.

Key Specifications

Pinout & Package

SN74CBT16245CDL is housed in a 48-pin SSOP (DL) package measuring 12.6 mm × 5.3 mm × 2.4 mm (max height), with 0.5-mm lead pitch and JEDEC MO-153 compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT16245CDL, SN74CBTD16212DLR trades transient protection for slightly lower cost, while SN74LVC16245ADLR sacrifices speed, voltage range, and power-down safety for CMOS logic compatibility - neither matches the SN74CBT16245CDL's combination of sub-ns delay, −2 V robustness, and Ioff-enabled modularity.

Availability

SN74CBT16245CDL is available at Aetrix Electronics and suitable for PCI interface design, memory interleaving architectures, and industrial backplane signal gating requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74CBT16245CDL 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 decades of expertise in high-speed logic and interface solutions.

The SN74CBT16245CDL belongs to TI's Widebus™ family of high-speed FET bus switches, engineered specifically for low-distortion, bidirectional signal gating in demanding digital infrastructure applications such as computing backplanes and memory subsystems.

FAQ

What is the maximum undershoot voltage the SN74CBT16245CDL can withstand on its A and B ports?

The SN74CBT16245CDL provides active undershoot protection up to −2 V on both A and B ports, as verified in the absolute maximum ratings and undershoot characteristics tables of the SCDS139 datasheet. This protection is implemented via internal sensing circuitry that forces the switch into a guaranteed OFF state during transient negative excursions, eliminating the need for external clamping diodes in most industrial bus applications.

Does the SN74CBT16245CDL support partial-power-down operation?

Yes, the SN74CBT16245CDL 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 ensures no damaging backflow current occurs between powered and unpowered sections of a system, making SN74CBT16245CDL suitable for hot-swap and modular power architecture designs.

What is the typical ON-state resistance (ron) of the SN74CBT16245CDL and how does it affect signal integrity?

The SN74CBT16245CDL has a typical ON-state resistance of 3 Ω at VCC = 4.5 V and IO = 30 mA. This low ron minimizes voltage drop and power dissipation across the switch, preserving signal amplitude and edge fidelity - especially critical for high-speed digital signals and analog waveforms routed through the device in mixed-signal applications.

Can the SN74CBT16245CDL operate with mixed-voltage signaling between 1.8-V and 5-V logic families?

Yes, the SN74CBT16245CDL supports 0–5-V signaling on its data I/Os, explicitly covering 0.8-V, 1.2-V, 1.5-V, 1.8-V, 2.5-V, 3.3-V, and 5-V logic levels. Its voltage-agnostic architecture allows seamless bidirectional interfacing between disparate voltage domains without level-shifting components, provided VCC is maintained within 4–5.5 V and control inputs meet VIH/VIL thresholds.

What package type and dimensions does the SN74CBT16245CDL use?

The SN74CBT16245CDL uses a 48-pin SSOP (DL) package with 0.5-mm lead pitch, body dimensions of 12.6 mm × 5.3 mm, and maximum height of 2.4 mm. It complies with JEDEC MO-153 standard and features four VCC and six GND pins for optimal power integrity - documented in TI's MPDS006C mechanical drawing and PACKAGE OPTION ADDENDUM.