Texas Instruments SN74CBT16209ADGVR

Overview

SN74CBT16209ADGVR from Texas Instruments is an 18-bit high-speed TTL-compatible bus switch with 5-Ω on-state resistance, operating from 4 V to 5.5 V supply, supporting 0.25 ns typical propagation delay (VCC = 5 V), and configured as a 9-bit bus exchanger with S0–S2 select control for data routing between four signal ports in industrial backplane and memory interface applications.

For engineers reviewing the SN74CBT16209ADGVR datasheet, SN74CBT16209ADGVR pinout, SN74CBT16209ADGVR application, or SN74CBT16209ADGVR equivalent, key selection criteria include its 48-pin TVSOP (DGV) package, ±1 µA input leakage, 7.5 pF OFF-state capacitance, and function table–driven port mapping for A/B bidirectional switching under TTL-level control inputs.

Technical Context

The SN74CBT16209ADGVR implements a passive FET-based analog switch architecture with no internal level-shifting or buffering-signal integrity relies on direct conduction path matching. Its three select inputs (S0, S1, S2) configure nine independent A/B channel pairs into eight functional modes including disconnect, single-port pass-through, and full 9-bit crossbar exchange.

Each of the 18 switched channels exhibits matched on-resistance (4–8 Ω at VCC = 4.5 V, II = 30 mA), low charge injection (<0.5 pC), and rail-to-rail analog signal handling up to VCC, enabling transparent bidirectional data transfer without direction control pins or timing skew between A and B sides.

Key Specifications

Pinout & Package

SN74CBT16209ADGVR uses a 48-pin Thin Very Small Outline Package (TVSOP, DGV), 7.1 mm × 10.2 mm body, 0.4 mm pitch, 1.2 mm max height, JEDEC MO-153 compliant, with exposed pad not present and moisture sensitivity level 1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT16209ADGVR, SN74CBTD16210DGVR adds voltage translation but sacrifices exchanger functionality, while SN74CBT3244DGVR reduces footprint and cost at the expense of channel count and routing versatility-making SN74CBT16209ADGVR optimal for compact, high-density 9-bit bidirectional exchange where minimal propagation delay and TTL compatibility are critical.

Availability

SN74CBT16209ADGVR is available at Aetrix Electronics and suitable for memory interfacing, backplane routing, and FPGA I/O expansion requiring stable component supply, long-term industrial lifecycle support, and consistent TVSOP packaging across production batches.

Supply support for SN74CBT16209ADGVR 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 50 years of innovation in high-speed interface and bus technology.

The SN74CBT16209ADGVR belongs to TI's Widebus™ family of TTL-compatible bus switches, designed specifically for low-latency, low-distortion signal routing in 5-V digital systems where pin efficiency, timing predictability, and interoperability with legacy logic are essential.

FAQ

What is the maximum continuous current rating per channel for the SN74CBT16209ADGVR?

The SN74CBT16209ADGVR supports a maximum continuous channel current of 128 mA, verified per absolute maximum ratings in the official datasheet (SCDS006O). This rating applies across the full operating temperature range (−40°C to +85°C) and ensures reliable conduction without thermal derating under typical 5-V bus conditions. Exceeding this current may trigger thermal shutdown or degrade on-resistance stability in the SN74CBT16209ADGVR.

Does the SN74CBT16209ADGVR require external pull-up or pull-down resistors on its S0, S1, and S2 control inputs?

No, the SN74CBT16209ADGVR does not require external pull-up or pull-down resistors on S0, S1, or S2-TI's datasheet explicitly states that unused control inputs must be held at VCC or GND to ensure proper operation, but this is a design requirement, not a hardware dependency. The SN74CBT16209ADGVR has no internal weak pull-ups; external biasing is mandatory only if those pins are left unconnected in the system, not as a default practice.

Can the SN74CBT16209ADGVR operate with a 3.3-V supply?

No, the SN74CBT16209ADGVR is not rated for 3.3-V operation. Its recommended supply voltage range is strictly 4 V to 5.5 V, and absolute maximum VCC is 7 V. At 3.3 V, the device fails to meet VIH/VIL thresholds (2 V/0.8 V), resulting in undefined switching behavior and potential signal corruption. For 3.3-V systems, consider TI's SN74CBTD series instead of the SN74CBT16209ADGVR.

What is the thermal resistance (θJA) of the SN74CBT16209ADGVR in its TVSOP (DGV) package?

The SN74CBT16209ADGVR in the TVSOP (DGV) package has a specified junction-to-ambient thermal resistance (θJA) of 58°C/W, as documented in the "Absolute Maximum Ratings" section of SCDS006O. This value assumes standard JEDEC PCB mounting conditions (2-layer board, 1-in² copper pad) and enables thermal budgeting for continuous 128-mA channel operation without exceeding 125°C junction temperature under worst-case ambient conditions.

How does the function table of the SN74CBT16209ADGVR determine data routing between ports?

The SN74CBT16209ADGVR uses the 3-bit combination of S2, S1, and S0 to select one of eight routing modes-including disconnect, A1↔B1, A1↔B2, A2↔B1, A2↔B2, and dual-path exchange (A1↔B1 + A2↔B2 or A1↔B2 + A2↔B1). Each mode maps specific A1/A2 and B1/B2 terminals directly, with no internal logic or latching-routing is purely analog and instantaneous, as defined in the function table on page 2 of SCDS006O.