Texas Instruments SN74CBT16211CDLR

Overview

SN74CBT16211CDLR 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, <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 interface and memory interleaving applications.

For engineers reviewing the SN74CBT16211CDLR datasheet, SN74CBT16211CDLR pinout, SN74CBT16211CDLR application, or SN74CBT16211CDLR equivalent, key selection criteria include bidirectional low-distortion signal gating, Ioff partial-power-down capability, ±128 mA switch current rating, and SSOP-56 package compatibility with legacy Widebus™ system designs.

Technical Context

The SN74CBT16211CDLR implements dual 12-bit FET-based transmission gates controlled by independent OE inputs (1OE, 2OE), enabling either two isolated 12-bit buses or one consolidated 24-bit path. Its active undershoot-protection circuitry clamps A/B port voltages down to −2 V while maintaining OFF-state isolation.

Each switch channel exhibits near-zero propagation delay due to low ron–Cio product (3 Ω × 5.5 pF typical), supports 0–5.5 V data I/O swing independent of VCC, and incorporates TTL/CMOS-compatible control inputs with ±1 µA leakage and 2 V VIH minimum threshold.

Key Specifications

Pinout & Package

SN74CBT16211CDLR uses a 56-pin SSOP (DL) package with 0.5-mm pitch, 13.9 mm × 7.9 mm body size, and 1.2 mm max height per JEDEC MO-194. 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 SN74CBT16211CDLR, SN74CBTD16211DGGR adds bus-hold but increases quiescent current and changes package, while SN74LVC16244ADGGR trades bidirectional zero-delay switching for buffered directionality and higher drive - making SN74CBT16211CDLR optimal for latency-critical isolation tasks.

Availability

SN74CBT16211CDLR is available at Aetrix Electronics and suitable for PCI interface design, memory interleaving architectures, and bus isolation systems requiring stable component supply, long-term obsolescence management, and full traceability.

Supply support for SN74CBT16211CDLR 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 delivering analog, embedded processing, and logic solutions with emphasis on reliability, scalability, and broad ecosystem support.

The SN74CBT16211CDLR belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for low-latency, low-distortion signal routing in computing, communications, and industrial backplane applications.

FAQ

What is the maximum undershoot voltage the SN74CBT16211CDLR can tolerate on its A and B ports?

The SN74CBT16211CDLR 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 switch into a safe OFF state, preventing substrate current injection and latch-up in hot-swap or noisy bus environments. The specification is validated per test conditions in the SCDS116C datasheet with VCC = 5.5 V and switch OFF.

Does the SN74CBT16211CDLR support mixed-voltage operation between different logic families?

Yes, the SN74CBT16211CDLR supports 0 V to 5.5 V signaling on its data I/O ports independent of VCC (4 V–5.5 V), enabling interoperability across 0.8-V, 1.2-V, 1.5-V, 1.8-V, 2.5-V, 3.3-V, and 5-V logic families. Control inputs accept TTL or 5-V/3.3-V CMOS levels, and the device requires no external level shifters - making SN74CBT16211CDLR ideal for heterogeneous voltage-domain interconnects.

What is the ON-state resistance (ron) specification for the SN74CBT16211CDLR, and how does it affect signal integrity?

The SN74CBT16211CDLR has a typical ON-state resistance of 3 Ω, with a maximum of 6 Ω across temperature and voltage. This low ron minimizes voltage drop (e.g., <100 mV at 33 mA) and preserves signal rise/fall times, directly contributing to sub-0.24 ns propagation delay. Combined with 5.5 pF OFF-state capacitance, this ensures minimal loading and distortion - critical for SN74CBT16211CDLR deployment in high-speed digital buses like PCI and memory interfaces.

How does the Ioff feature of the SN74CBT16211CDLR protect systems during partial power-down?

The Ioff feature limits current to 10 µA maximum when VCC = 0 V and data pins are biased between 0 V and 5.5 V, preventing damaging backflow through the SN74CBT16211CDLR during partial power-down. This ensures isolation between powered and unpowered sections of a system - essential for hot-swap compliance and robustness in modular industrial or telecom equipment using SN74CBT16211CDLR for bus segmentation.

What package type and dimensions does the SN74CBT16211CDLR use, and is it RoHS-compliant?

The SN74CBT16211CDLR uses a 56-pin SSOP (DL) package measuring 13.9 mm × 7.9 mm × 1.2 mm max height, compliant with JEDEC MO-194. It is RoHS-compliant with NiPdAu (NIPDAU) lead finish and MSL Level-1 rating (260°C peak reflow). The tape-and-reel format contains 1000 units per reel, and pin 1 orientation follows quadrant Q1 per TI's packaging documentation - confirming full manufacturability and compliance for SN74CBT16211CDLR in modern SMT lines.