Texas Instruments SN74CBT16211CDGVR

Overview

SN74CBT16211CDGVR from Texas Instruments is a 24-bit FET bus switch IC organized as two independent 12-bit bidirectional switches, featuring 3 Ω typical ON-state resistance (ron), <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) for PCI interface and memory interleaving applications.

For engineers reviewing the SN74CBT16211CDGVR datasheet, SN74CBT16211CDGVR pinout, SN74CBT16211CDGVR application, or SN74CBT16211CDGVR equivalent, key selection criteria include its Ioff-enabled partial-power-down capability, 5.5 pF OFF-state I/O capacitance, dual 12-bit enable control (1OE/2OE), and TVSOP-56 package compatibility with high-density PCB layouts.

Technical Context

The SN74CBT16211CDGVR implements TTL-compatible FET-based switching with active undershoot-protection circuitry on both A and B ports, ensuring reliable OFF-state isolation down to −2 V. Its architecture supports two independent 12-bit channels, each controlled by dedicated OE inputs (1OE, 2OE), enabling flexible bus segmentation.

Each channel provides near-zero propagation delay via low-impedance FET paths and maintains high-impedance isolation when disabled. The device incorporates Ioff logic to block reverse current during partial power-down, and features clamp diodes on all data/control inputs for robust ESD and transient immunity per JESD22.

Key Specifications

Pinout & Package

SN74CBT16211CDGVR uses a 56-pin TVSOP (DGV) package with 1.2 mm maximum height, JEDEC MO-194 compliant, optimized for high-density surface-mount assembly. Pin 1 is located in Quadrant Q1 per tape-and-reel orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBTD16211DGVR and SN74LVC16244ADGVR, the SN74CBT16211CDGVR uniquely delivers bidirectional 24-bit switching with −2 V undershoot protection, 3 Ω ron, and Ioff-making it the sole choice for high-fidelity, hot-pluggable bus isolation in 4–5.5 V systems.

Availability

SN74CBT16211CDGVR is available at Aetrix Electronics and suitable for PCI interface design, memory interleaving architectures, and low-distortion signal gating applications requiring stable component supply and long-term industrial availability.

Supply support for SN74CBT16211CDGVR 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 high-reliability electronic components.

The SN74CBT16211CDGVR belongs to TI's Widebus™ family of high-speed FET bus switches, engineered specifically for low-latency, low-distortion, and robust hot-swap-capable bus isolation in computing, communications, and industrial control systems.

FAQ

What is the maximum undershoot voltage the SN74CBT16211CDGVR can tolerate on its A and B ports?

The SN74CBT16211CDGVR tolerates up to −2 V undershoot on both A and B ports thanks to integrated active undershoot-protection circuitry. This feature ensures the switch remains reliably OFF during negative transients, preventing false conduction and system instability in hot-swap or noisy environments. The −2 V rating is verified per test conditions in the SCDS116C datasheet under "Undershoot Characteristics".

Does the SN74CBT16211CDGVR support partial-power-down operation, and how does it behave when VCC = 0 V?

Yes, the SN74CBT16211CDGVR supports partial-power-down via its Ioff feature. When VCC = 0 V, the device limits reverse current to ≤10 µA (max), preventing damaging backflow from live I/O lines into the unpowered IC. This behavior is specified in the "Electrical Characteristics" table and enables safe integration into systems with staggered power sequencing, such as modular backplanes or multi-rail embedded controllers.

What is the typical ON-state resistance (ron) of the SN74CBT16211CDGVR, and how does it impact signal integrity?

The SN74CBT16211CDGVR has a typical ON-state resistance (ron) of 3 Ω, measured at VCC = 4.5 V with 30 mA current. This low ron minimizes voltage drop and timing skew across all 24 bidirectional channels, preserving signal edge rates and reducing crosstalk-induced jitter. In practice, it enables clean 100+ MHz digital signal transmission without added termination or equalization.

Can the SN74CBT16211CDGVR interface between different logic voltage levels, such as 1.8 V and 5 V devices?

Yes, the SN74CBT16211CDGVR supports 0–5.5 V signaling on all data I/Os, allowing seamless interfacing between 1.8 V, 2.5 V, 3.3 V, and 5 V logic families without external level shifters. Its TTL-compatible control inputs accept 0.8 V VIH thresholds, and the 3 Ω ron ensures minimal level degradation. This capability is explicitly confirmed in the "Data I/Os Support 0 to 5-V Signaling Levels" feature list.

What package type and pin count does the SN74CBT16211CDGVR use, and what are its key mechanical attributes?

The SN74CBT16211CDGVR uses a 56-pin TVSOP (DGV) package with 1.2 mm maximum height, JEDEC MO-194 registered, and 0.4 mm lead pitch. Key attributes include four dedicated GND pins for noise reduction, Q1 pin-1 orientation for automated placement, and compatibility with standard 24.4 mm tape-and-reel widths. Mechanical drawings confirm body dimensions of 11.4 mm × 4.5 mm × 1.2 mm (L × W × H).