Texas Instruments SN74CBTS16212DL

Overview

SN74CBTS16212DL from Texas Instruments is a 24-bit FET bus-exchange switch with Schottky diode clamping, designed for high-speed TTL-compatible signal routing in memory and data-path interconnects. It provides 5-Ω on-state resistance, supports 4 V to 5.5 V supply operation, and enables bidirectional data exchange between 12 A/B port pairs via S0–S2 select inputs. Used in backplane switching and hot-swap-capable system boards.

For engineers reviewing the SN74CBTS16212DL datasheet, SN74CBTS16212DL pinout, SN74CBTS16212DL application, or SN74CBTS16212DL equivalent, key selection criteria include its 0.25 ns propagation delay at 5 V, latch-up immunity >250 mA (JESD 17), and dual-mode operation as either a 24-bit bus switch or 12-bit data exchanger - critical for low-latency, rail-to-rail digital signal path design.

Technical Context

This device implements a CMOS-based FET transmission gate architecture with integrated Schottky clamps on all I/O pins to suppress undershoot transients. Its three-level select logic (S0–S2) configures 8 distinct switching states including full disconnect, single-port pass-through, and cross-connected A↔B exchange modes.

It operates without internal level-shifting circuitry, requiring TTL-compatible control inputs (VIH ≥ 2 V, VIL ≤ 0.8 V) and delivering rail-to-rail analog switching performance across the full 4–5.5 V VCC range. All 24 channels are independently controllable only through global select lines - no per-channel enable.

Key Specifications

Pinout & Package

SN74CBTS16212DL is housed in a 56-pin SSOP (Shrink Small Outline Package) with 0.5-mm lead pitch, 13.9 mm × 7.9 mm body size, and 1.2-mm max height - optimized for high-density PCB layouts with thermal resistance θJA = 56°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBTS16212DL, the DGGR variant offers tighter board area usage and slightly higher thermal resistance, while the DGVR delivers superior thermal performance and minimal Z-height - all three share identical switching characteristics, pin mapping, and logic behavior, enabling direct substitution with only mechanical layout adjustments.

Availability

SN74CBTS16212DL is available at Aetrix Electronics and suitable for memory subsystems, hot-swap backplanes, and FPGA I/O expansion requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SN74CBTS16212DL 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 company specializing in analog, embedded processing, and connectivity technologies, with decades of leadership in logic and interface solutions.

The SN74CBTS16212DL belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for low-latency, rail-to-rail signal routing in memory, backplane, and FPGA-adjacent interconnect applications.

FAQ

What is the maximum operating frequency supported by the SN74CBTS16212DL?

The SN74CBTS16212DL does not specify a maximum clock frequency, as it is an analog switch - not a clocked device. Its 0.25 ns propagation delay at 5 V enables reliable operation with digital signals up to ~1 GHz bandwidth, assuming proper impedance control and load capacitance ≤50 pF. Signal integrity depends on PCB layout, not internal clocking.

Does the SN74CBTS16212DL require external pull-up or pull-down resistors on its S0–S2 control inputs?

Yes - all unused control inputs of the SN74CBTS16212DL must be held at VCC or GND to ensure predictable switching behavior. TI's application report SCBA004 explicitly recommends tying floating S0/S1/S2 pins to valid logic levels to prevent metastability and excessive ICC current. The SN74CBTS16212DL draws up to 2.5 mA extra supply current per unterminated control input.

Can the SN74CBTS16212DL be used for analog signal switching, such as audio or sensor signals?

Yes - the SN74CBTS16212DL supports rail-to-rail analog signal switching within its 0–5.5 V common-mode range. Its 5-Ω on-resistance and 10.5 pF off-capacitance make it suitable for low-distortion, wideband analog paths up to ~100 MHz, provided signal amplitude stays within VCC and GND. However, it lacks built-in ESD protection beyond JESD22 ratings, so external protection may be needed for exposed analog inputs.

What is the purpose of the Schottky diodes integrated into the SN74CBTS16212DL?

The Schottky diodes in the SN74CBTS16212DL clamp negative undershoot transients on all I/O pins to –1.2 V (at –18 mA), protecting downstream receivers from damage or false triggering during fast edge transitions or hot-plug events. This eliminates the need for external clamping diodes in applications like backplane switching or memory bus isolation where signal integrity under transient conditions is critical.

Is the SN74CBTS16212DL pin-compatible with other members of the Widebus™ family, such as the SN74CBT16210?

No - the SN74CBTS16212DL is not pin-compatible with the SN74CBT16210. While both belong to TI's Widebus™ family and share functional similarities, the SN74CBTS16212DL uses a 56-pin SSOP (DL) package with dedicated S0–S2 select lines and dual-A/B port structure, whereas the SN74CBT16210 is a 48-pin device with different pin assignment, fewer channels (20-bit), and no exchange mode. Direct replacement requires PCB redesign.