Texas Instruments SN74CBT16214CDL

Overview

SN74CBT16214CDL from Texas Instruments is a 12-bit, 1-of-3 bidirectional FET multiplexer/demultiplexer with 3 Ω typical ON-state resistance, near-zero propagation delay (0.15 ns at 5 V), and undershoot protection up to −2 V on A/B ports. It operates from 4 V to 5.5 V, supports 0–5-V signaling across 12 I/O pairs, and enables bus isolation in PCI and mixed-voltage digital systems.

For engineers reviewing the SN74CBT16214CDL datasheet, SN74CBT16214CDL pinout, SN74CBT16214CDL application, or SN74CBT16214CDL equivalent, key selection criteria include its 56-pin SSOP (DL) package, Ioff partial-power-down capability, low 5.5 pF OFF-state B-port capacitance, and TTL/CMOS-compatible control inputs for legacy and modern logic interfacing.

Technical Context

The SN74CBT16214CDL implements twelve independent 1-of-3 analog/digital switches controlled by three select lines (S0–S2), each routing one A port to one of three corresponding B ports (B1/B2/B3). Its FET-based architecture delivers bidirectional signal flow with no direction pin required.

Each switch features active undershoot-protection circuitry that senses sub-ground transients and forces the switch into high-impedance OFF state, preventing false conduction. The device fully supports partial-power-down via Ioff, limiting backflow current when VCC = 0 V while maintaining isolation between A and B ports.

Key Specifications

Pinout & Package

SN74CBT16214CDL uses a 56-pin Shrink Small Outline Package (SSOP-DL), 13.9 mm × 7.9 mm body size, 0.5 mm pitch, 1.2 mm max height, RoHS-compliant NIPDAU finish, and MSL Level-1 rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT16214CDGGR, the SN74CBT16214CDL offers denser SSOP packaging for compact layouts, while SN74CBTD16214CDL adds bus-hold functionality at the cost of slightly higher quiescent current-both retain identical switching performance and undershoot protection.

Availability

SN74CBT16214CDL is available at Aetrix Electronics and suitable for PCI interface design, hot-swap backplane systems, and mixed-voltage logic interfacing requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SN74CBT16214CDL 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 SN74CBT16214CDL belongs to TI's Widebus™ family of high-speed FET bus switches, engineered specifically for low-distortion, bidirectional signal gating in PCI, memory, and mixed-voltage digital systems.

FAQ

What is the maximum undershoot voltage the SN74CBT16214CDL can withstand on its A and B ports?

The SN74CBT16214CDL provides active undershoot protection up to −2 V on both A and B ports, as verified in the absolute maximum ratings and undershoot characteristics sections of the official datasheet. This protection is implemented via internal sensing circuitry that forces the switch into a high-impedance OFF state during sub-ground transients, preventing false conduction. The SN74CBT16214CDL maintains this specification across its full operating temperature range of −40°C to 85°C.

Does the SN74CBT16214CDL support partial-power-down operation, and how is it implemented?

Yes, the SN74CBT16214CDL supports partial-power-down operation via its Ioff feature. When VCC = 0 V, the device limits Ioff leakage current to 10 µA maximum while maintaining high-impedance isolation between A and B ports. This prevents damaging backflow current from live buses into an unpowered subsystem. The SN74CBT16214CDL achieves this through internal circuitry that disables the switch FETs and clamps control inputs, ensuring safe hot-insertion in backplane and modular systems.

What is the ON-state resistance (ron) of the SN74CBT16214CDL, and how does it vary with supply voltage?

The SN74CBT16214CDL has a typical ON-state resistance (ron) of 3 Ω at VCC = 4.5 V and IO = 30 mA, and 5 Ω at VCC = 4 V and IO = −15 mA. The datasheet specifies ron increases slightly at lower VCC due to reduced FET drive strength. This parameter directly impacts voltage drop and power dissipation in signal paths; for example, at 64 mA, the worst-case ron is 6 Ω, yielding ≤384 mV drop. The SN74CBT16214CDL's ron remains stable across temperature and load conditions within its rated operating range.

Can the SN74CBT16214CDL interface between 3.3-V and 5-V logic domains without external level shifters?

Yes, the SN74CBT16214CDL supports 0–5-V signaling on all data I/Os (A and B ports), and its control inputs accept TTL or 5-V/3.3-V CMOS logic levels. This allows direct connection between 3.3-V microcontrollers and 5-V peripherals without external level translation. The SN74CBT16214CDL's VI/O rating of 0–5.5 V and VIH/VIL thresholds (2 V min / 0.8 V max) ensure robust interoperability across these voltage domains while maintaining signal integrity and timing margins.

What package type and dimensions does the SN74CBT16214CDL use, and what are its assembly requirements?

The SN74CBT16214CDL uses a 56-pin SSOP package (DL), measuring 13.9 mm × 7.9 mm with 0.5 mm lead pitch and 1.2 mm max height. It carries RoHS-compliant NIPDAU plating and MSL Level-1 rating, permitting unlimited floor life and standard reflow profiles up to 260°C peak. The SN74CBT16214CDL requires precise stencil design (0.125 mm thickness recommended) and alignment per TI's DGG/DL land pattern guidelines to ensure reliable solder joint formation on all 56 leads.