Texas Instruments SN74CBTH16211DGGR

Overview

SN74CBTH16211DGGR from Texas Instruments is a 24-bit FET bus switch with integrated bus-hold circuitry, designed for high-speed TTL-compatible signal routing in memory and data-bus isolation applications. It features dual 12-bit independent channels, 5-Ω on-state resistance, <0.25 ns propagation delay at 5 V, and operates from –40°C to 85°C in a 56-pin TSSOP package.

For engineers reviewing the SN74CBTH16211DGGR datasheet, SN74CBTH16211DGGR pinout, SN74CBTH16211DGGR application, or SN74CBTH16211DGGR equivalent, key selection criteria include on-resistance stability across VCC (4–5.5 V), bus-hold current capability (±500 µA), OE-controlled channel isolation timing (9.6 ns enable/disable), and thermal performance (θJA = 64°C/W) in space-constrained PCB layouts.

Technical Context

This device implements two independent 12-bit FET-based analog switches controlled by separate OE inputs, enabling flexible partitioning as either two 12-bit or one 24-bit bus switch. Each channel connects A-port to B-port bidirectionally when OE is low, with true high-impedance isolation when OE is high.

Active bus-hold circuitry maintains valid logic levels on floating A/B I/Os without external resistors-sourcing up to 500 µA at VIH min and sinking up to 500 µA at VIL max. The design uses TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) and supports 4–5.5 V supply operation with <3 µA ICC quiescent current.

Key Specifications

Pinout & Package

The SN74CBTH16211DGGR is housed in a 56-pin TSSOP (DGG) package, 13.9 mm × 6.1 mm × 1.2 mm, with 0.5-mm pitch and exposed thermal pad (not electrically connected). Pin 1 is located in quadrant Q1 per tape orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBTH16211DGGR, SN74CBT16211DGGR reduces component count but increases layout complexity and risk of floating nodes, while SN74LVC16245ADGGR offers stronger drive but sacrifices speed, voltage flexibility, and true bidirectionality-making SN74CBTH16211DGGR optimal for compact, robust 5-V bus isolation.

Availability

SN74CBTH16211DGGR is available at Aetrix Electronics and suitable for memory subsystem isolation, hot-swap backplane interfaces, and legacy bus translation requiring stable component supply, long-term industrial lifecycle support, and guaranteed traceable sourcing.

Supply support for SN74CBTH16211DGGR 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-reliability logic and interface solutions.

The SN74CBTH16211DGGR belongs to TI's advanced bus-switch family engineered for zero-delay, bidirectional signal routing in high-density computing, telecom, and industrial control systems where bus contention avoidance and floating-node immunity are critical.

FAQ

What is the maximum continuous current rating per channel for the SN74CBTH16211DGGR?

The SN74CBTH16211DGGR supports a continuous channel current of 128 mA per switch path. This rating applies under recommended operating conditions (VCC = 4–5.5 V, TA ≤ 85°C) and ensures reliable conduction without thermal runaway or parametric shift. Exceeding this current may degrade on-resistance stability or accelerate wear-out mechanisms in the internal FET structure. Always verify worst-case current distribution across all 24 channels in your application layout.

Does the SN74CBTH16211DGGR require external pull-up resistors on its I/O lines?

No, the SN74CBTH16211DGGR does not require external pull-up or pull-down resistors due to its integrated bus-hold circuitry. This feature actively sources or sinks up to ±500 µA to maintain valid logic levels on unused or floating A/B port lines. External resistors are unnecessary unless specific system-level noise immunity requirements exceed the built-in hold strength-verified via IBHL/IBHH electrical characteristics in the datasheet.

Can the SN74CBTH16211DGGR operate reliably at 3.3 V supply voltage?

No, the SN74CBTH16211DGGR is not specified for 3.3 V operation. Its recommended supply range is 4 V to 5.5 V, with absolute maximum ratings down to –0.5 V and up to 7 V. At 3.3 V, bus-hold functionality degrades significantly (IBHLO/IBHHO drop below usable thresholds), and on-resistance rises beyond 7 Ω-violating timing and signal-integrity specs. For 3.3-V systems, consider TI's SN74LVC series or level-shifted interface designs.

How should the OE pins be handled during power-up to ensure safe high-impedance state?

To guarantee high-impedance state during power-up or power-down, each OE pin (1OE and 2OE) of the SN74CBTH16211DGGR must be tied to VCC through an external pullup resistor. The minimum resistor value depends on the current-sinking capability of the driving source; TI recommends ≥10 kΩ for typical microcontroller GPIOs. This prevents momentary channel activation before supply stabilization, avoiding bus contention or unintended signal coupling during sequencing.

Is the SN74CBTH16211DGGR pin-compatible with other packages in the same family?

Yes, the SN74CBTH16211DGGR shares identical pinout and function mapping with SN74CBTH16211DL (SSOP) and SN74CBTH16211DGVR (TVSOP), as confirmed by TI's SCDS062C datasheet and package drawings. All three variants use the same 56-pin topology, including identical A/B port assignments, OE locations, and power/ground pin placements-enabling direct PCB footprint interchangeability where thermal and mechanical constraints allow.