Texas Instruments SN74CBT16214CDGGR

Overview

SN74CBT16214CDGGR from Texas Instruments is a 12-bit, 1-of-3 FET bus switch with bidirectional signal routing, 3 Ω typical ON-state resistance, <0.24 ns propagation delay at 4 V, and −2 V undershoot protection on A/B ports. It operates from 4 V to 5.5 V and supports mixed-voltage signaling (0.8 V to 5 V) in PCI bus isolation and high-speed digital gating applications.

For engineers reviewing the SN74CBT16214CDGGR datasheet, SN74CBT16214CDGGR pinout, SN74CBT16214CDGGR application, or SN74CBT16214CDGGR equivalent, key selection criteria include its 56-pin TSSOP package, I_off partial-power-down capability, low 5.5 pF B-port OFF-capacitance, and TTL/CMOS-compatible control inputs for legacy and mixed-signal system integration.

Technical Context

This device implements twelve independent 1-of-3 analog/digital multiplexer/demultiplexer channels, each controlled by three select lines (S0–S2) to route signals between one A port and up to three B sub-ports (B1/B2/B3). Each channel uses FET-based switching with active undershoot-protection circuitry that clamps transient excursions down to −2 V while maintaining OFF-state isolation.

It features I_off current limiting (<10 µA at V_CC = 0 V) for safe partial-power-down operation, near-zero propagation delay due to low r_on–C_io product, and bidirectional data flow without direction control-enabling transparent signal pass-through in both directions when enabled.

Key Specifications

Pinout & Package

TSSOP-56 (DGG) package: 13.9 mm × 6.1 mm × 1.2 mm body, 0.5 mm pitch, lead-free NiPdAu finish, MSL Level-1, RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT16214CDGGR, SN74CBTD16214DGGR adds bus-hold but sacrifices undershoot margin, while 74LVC1G3157DCUR offers footprint savings at the cost of channel count, isolation robustness, and system-level protection features.

Availability

SN74CBT16214CDGGR is available at Aetrix Electronics and suitable for PCI interface design, hot-swappable backplane development, and multi-voltage system interfacing requiring stable component supply, long-term lifecycle assurance, and full traceability.

Supply support for SN74CBT16214CDGGR 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 electronic components.

The SN74CBT16214CDGGR belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for low-distortion, bidirectional signal routing in PCI, memory, and mixed-voltage digital systems.

FAQ

What is the maximum undershoot voltage the SN74CBT16214CDGGR can tolerate on its A and B ports?

The SN74CBT16214CDGGR tolerates up to −2 V undershoot on both A and B ports thanks to integrated active undershoot-protection circuitry. This feature senses negative transients and forces the internal FETs into a reliable OFF state, preventing false conduction or latch-up. The −2 V rating is verified per test conditions in the official datasheet (SCDS121B) and applies across the full operating temperature range of −40°C to 85°C. SN74CBT16214CDGGR maintains this protection without external components.

Does the SN74CBT16214CDGGR support bidirectional signal flow without additional control logic?

Yes, the SN74CBT16214CDGGR supports true bidirectional signal flow with no direction pin or control overhead. When enabled, each A port connects directly to its selected B port (B1/B2/B3) via low-resistance FETs, allowing signals to propagate equally well in either direction. This eliminates the need for external direction-control circuitry or timing adjustments. SN74CBT16214CDGGR achieves this using symmetrical switch architecture and matched r_on, confirmed by its <0.24 ns propagation delay in both A→B and B→A directions.

Can the SN74CBT16214CDGGR be used in partial-power-down systems where V_CC is disconnected?

Yes, the SN74CBT16214CDGGR includes I_off circuitry that limits current to ≤10 µA when V_CC = 0 V, enabling safe partial-power-down operation. This prevents damaging back-current from flowing through the switch into a powered subsystem. The device maintains high-impedance isolation between A and B ports during power-off, and its I_off specification exceeds JESD78 Class II latch-up requirements. SN74CBT16214CDGGR is explicitly designed for this use case and requires no external circuitry to implement it.

What is the signal voltage range supported by the SN74CBT16214CDGGR data I/Os?

The SN74CBT16214CDGGR data I/Os support 0 V to 5.5 V signaling levels, covering 0.8-V, 1.2-V, 1.5-V, 1.8-V, 2.5-V, 3.3-V, and 5-V logic families. This allows direct interfacing between disparate voltage domains without external level shifters. The control inputs accept TTL or 3.3-V/5-V CMOS levels (V_IL ≤ 0.8 V, V_IH ≥ 2 V), and the device remains functional across its full V_CC range of 4 V to 5.5 V. SN74CBT16214CDGGR leverages this flexibility in mixed-voltage system designs.

How many independent channels does the SN74CBT16214CDGGR provide, and how are they configured?

The SN74CBT16214CDGGR provides twelve independent 1-of-3 multiplexer/demultiplexer channels. Each channel routes one A-port signal to one of three B-port banks (B1, B2, or B3) based on the 3-bit select code (S0/S1/S2). The function table confirms six valid connect states (e.g., S0=L/S1=L/S2=H → A=B1) plus two disconnect states. All twelve channels operate simultaneously and independently. SN74CBT16214CDGGR's 56-pin TSSOP package allocates dedicated pins for all 12 A ports, 36 B ports, and three select lines.