Texas Instruments SN74CBTS16212DGGR

Overview

SN74CBTS16212DGGR from Texas Instruments is a 24-bit FET bus-exchange switch with Schottky diode clamping, designed for high-speed TTL-compatible data routing in memory and bus interface applications. It features 5-Ω on-state resistance, 0.25 ns propagation delay at 5 V, and supports bidirectional 12-bit data exchange across four ports via S0–S2 select inputs.

For engineers reviewing the SN74CBTS16212DGGR datasheet, SN74CBTS16212DGGR pinout, SN74CBTS16212DGGR application, or SN74CBTS16212DGGR equivalent, this device is selected for low-latency, latch-up-resistant bus switching in industrial control backplanes, FPGA I/O expansion, and legacy parallel interface bridging where undershoot protection and TTL-level compatibility are critical.

Technical Context

The SN74CBTS16212DGGR implements a dual 12-bit configurable bus switch architecture: it operates either as a 24-bit transparent path (A↔B) or as a 12-bit exchanger that routes A1/B1 and A2/B2 pairs based on 3-bit select logic (S0–S2). Its FET-based switch core delivers symmetric bidirectional conduction without direction pins.

Each I/O channel integrates Schottky clamping diodes to suppress negative undershoot below –1.2 V, while meeting JESD 17 latch-up immunity (>250 mA) and JESD 22 ESD ratings (2000-V HBM, 200-V MM). Control inputs are TTL-compatible (VIH = 2 V, VIL = 0.8 V) and require termination to VCC or GND for stable operation.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT16212DGGR and 74LVC1G3157DCKR, the SN74CBTS16212DGGR uniquely combines integrated Schottky clamping, 24-bit coordinated switching, and programmable bus exchange - making it irreplaceable in high-reliability, multi-bit parallel interface designs where signal integrity and configuration flexibility are co-dependent requirements.

Availability

SN74CBTS16212DGGR is available at Aetrix Electronics and suitable for industrial backplane switching, FPGA I/O expansion, memory interfacing, and legacy parallel interface bridging requiring stable component supply across extended product lifecycles.

Supply support for SN74CBTS16212DGGR 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 experience in high-reliability interface solutions.

The SN74CBTS16212DGGR belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for low-latency, noise-immune data routing in industrial, computing, and communications infrastructure.

FAQ

What is the maximum operating frequency supported by the SN74CBTS16212DGGR?

The SN74CBTS16212DGGR does not specify a maximum clock frequency, as it is an analog bus switch-not a clocked device. Its 0.25 ns propagation delay at 5 V enables reliable operation with parallel bus data rates exceeding 100 MHz, provided trace capacitance remains ≤50 pF and signal rise times are ≥1 ns. System-level timing must account for total path delay including PCB routing.

Does the SN74CBTS16212DGGR require external pull-up or pull-down resistors on its control inputs?

Yes - all unused S0, S1, and S2 inputs of the SN74CBTS16212DGGR must be terminated to either VCC or GND to prevent floating states that could cause undefined switching behavior or increased ICC. TI recommends using 10-kΩ resistors; direct connection is acceptable if system logic guarantees stable levels during power-up and operation.

Can the SN74CBTS16212DGGR operate with a 3.3-V supply?

No - the SN74CBTS16212DGGR is specified only for 4 V to 5.5 V operation. At 3.3 V, the device fails to meet guaranteed ron, tpd, and VIH/VIL thresholds; output drive strength degrades significantly, and Schottky clamping may become ineffective. For 3.3-V systems, consider TI's SN74LVC1G3157 or similar LVC-family switches.

How does the Schottky clamping in the SN74CBTS16212DGGR improve system reliability?

The Schottky clamping diodes on every I/O of the SN74CBTS16212DGGR limit negative undershoot to –1.2 V at –18 mA, preventing sub-threshold conduction in downstream CMOS inputs and avoiding latch-up triggers. This is especially critical in hot-swap scenarios, long trace runs, or systems with inductive loads where ground bounce or crosstalk induces transient negativity.

Is the SN74CBTS16212DGGR pin-compatible with other members of the Widebus™ family?

The SN74CBTS16212DGGR shares the same TSSOP-56 (DGG) footprint and pinout with SN74CBT16212DGGR and SN74CBTD16212DGGR, differing only in internal clamping and drive strength. However, substitution requires verification of Schottky diode necessity, as SN74CBT16212DGGR lacks clamping and SN74CBTD16212DGGR adds series resistors for EMI reduction.