Texas Instruments SN74CBT16212ADGVR

Overview

SN74CBT16212ADGVR from Texas Instruments is a 24-bit high-speed TTL-compatible bus switch with 5-Ω on-state resistance, operating at 4 V to 5.5 V supply voltage and supporting −40°C to 85°C industrial temperature range. It functions as either a 24-bit bus switch or a 12-bit bus exchanger via S0/S1/S2 select inputs, enabling low-latency data routing in memory expansion and FPGA I/O bridging applications.

For engineers reviewing the SN74CBT16212ADGVR datasheet, SN74CBT16212ADGVR pinout, SN74CBT16212ADGVR application, or SN74CBT16212ADGVR equivalent, key selection criteria include its 0.25 ns typical propagation delay (VCC = 5 V), 128 mA continuous channel current rating, TVSOP-56 package footprint, and bidirectional signal path capability without level translation.

Technical Context

The SN74CBT16212ADGVR implements a passive FET-based analog switch architecture with no internal logic latching-signal paths are purely resistive and bidirectional. Its control logic uses three select inputs (S0, S1, S2) to configure 8 distinct switching modes, including full disconnect, port-to-port pass-through, and cross-exchange between A/B banks.

All 24 channels feature matched on-resistance (4–7 Ω typical at VCC = 4.5 V), low off-capacitance (7.5 pF), and TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V), ensuring compatibility with legacy 5-V logic families while maintaining sub-nanosecond timing integrity under 50-pF load conditions.

Key Specifications

Pinout & Package

SN74CBT16212ADGVR is housed in a 56-pin Thin Very Small Outline Package (TVSOP-DGV), 6.1 mm × 13.9 mm body size, 1.2 mm max height, 0.5 mm lead pitch, with exposed thermal pad (non-electrical). Pin 1 marked by beveled corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT16212ADGVR, the SN74CBT16210DGVR offers identical performance in a smaller 48-pin TVSOP for reduced layout area, while the SN74CBTD16211DGVR adds power-down capability at the cost of slightly higher on-resistance and design complexity-neither is pin-compatible, but both share the same functional family architecture and thermal profile.

Availability

SN74CBT16212ADGVR is available at Aetrix Electronics and suitable for memory expansion interfaces, FPGA I/O bridging, PCI bus arbitration, and test access multiplexing requiring stable component supply across industrial temperature ranges and long-lifecycle programs.

Supply support for SN74CBT16212ADGVR 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-reliability interface and signal-path components.

The SN74CBT16212ADGVR belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for low-latency, bidirectional signal routing in memory subsystems and programmable logic interconnects where timing predictability and signal integrity are critical.

FAQ

What is the maximum continuous current rating per channel for the SN74CBT16212ADGVR?

The SN74CBT16212ADGVR supports a continuous channel current of 128 mA per switch, verified per absolute maximum ratings in the official datasheet. This rating applies across the full −40°C to +85°C operating range and ensures reliable conduction without thermal derating under typical PCB copper weight and airflow conditions. Exceeding this value risks permanent on-resistance drift or bond-wire failure.

Does the SN74CBT16212ADGVR require external pull-up or pull-down resistors on its S0, S1, and S2 control inputs?

No, the SN74CBT16212ADGVR does not require external biasing on S0, S1, or S2-its TTL-compatible inputs have defined VIH (2 V) and VIL (0.8 V) thresholds, and TI explicitly states in the recommended operating conditions that unused control inputs must be held at VCC or GND. Floating control lines may cause undefined switching states or increased ICC, so direct connection is preferred over resistor termination.

Can the SN74CBT16212ADGVR be used in 3.3-V systems?

The SN74CBT16212ADGVR is not rated for 3.3-V operation: its minimum supply voltage is 4 V, and its TTL input thresholds (VIH = 2 V, VIL = 0.8 V) assume a 5-V reference. Using it with 3.3-V logic may result in marginal or non-functional control signaling and undefined switch behavior. For 3.3-V systems, TI recommends the SN74CB3Q16212 or similar LVT logic-family alternatives.

What is the thermal resistance (θJA) of the SN74CBT16212ADGVR in its TVSOP package?

The SN74CBT16212ADGVR in the TVSOP-DGV (DGVR) package has a specified junction-to-ambient thermal resistance (θJA) of 48°C/W, measured per JESD51-7 standards. This value assumes standard JEDEC 2-layer board layout with 1-in² copper pour; actual thermal performance improves with internal layers, thermal vias, or heatsinking, but derating is required above 70°C ambient for sustained 128 mA per channel operation.

Is the SN74CBT16212ADGVR pin-compatible with other members of the CBT16212A family?

Yes-the SN74CBT16212ADGVR shares identical pinout and function mapping with SN74CBT16212ADL, SN74CBT16212ADLR, and SN74CBT16212ADGGR, as confirmed by TI's package drawings and logic diagrams. All variants use the same 56-pin arrangement, terminal assignments, and signal naming (e.g., 1A1, S0, VCC, GND), enabling direct substitution across SSOP, TSSOP, and TVSOP packages when board layout accommodates footprint differences.