Texas Instruments SN74CB3T16210DGGR

Overview

SN74CB3T16210 from Texas Instruments is a 20-bit FET bus switch IC with dual 10-bit configurable switching, 5-V-tolerant I/Os, 5 Ω typical ON-state resistance, and mixed-mode level translation supporting 2.5 V/3.3 V VCC with 0–5 V signaling on all data ports. It enables bidirectional signal routing in PCI, USB, and memory-interleaved systems.

For engineers reviewing the SN74CB3T16210 datasheet, SN74CB3T16210 pinout, SN74CB3T16210 application, or SN74CB3T16210 equivalent, key selection considerations include its 2.3–3.6 V supply range, Ioff partial-power-down support, near-zero propagation delay (0.15 ns), 5 pF OFF-state I/O capacitance, and TSSOP-48 package compatibility with high-density PCB layouts.

Technical Context

The SN74CB3T16210 implements two independent 10-bit FET bus switches controlled by separate OE inputs (1OE, 2OE), enabling either dual 10-bit or unified 20-bit operation. Each switch provides bidirectional conduction with voltage translation that tracks VCC - e.g., 5-V input to 3.3-V output when VCC = 3.3 V.

Its architecture supports true 5-V tolerance on all I/Os regardless of power state, includes undershoot clamp diodes on data/control inputs, and guarantees latch-up immunity >250 mA per JESD 17. The device uses zero-threshold FETs to achieve low ron and minimal loading, with Ioff preventing backflow during partial power-down.

Key Specifications

Pinout & Package

TSSOP-48 (DGG) package: 12.6 mm × 6.2 mm × 1.2 mm body, 0.5 mm pitch, lead-free NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CB3T16210, SN74CBTD16210 offers higher voltage headroom but sacrifices low-voltage flexibility and power-down safety, while SN74LVC16245A provides stronger drive capability at the cost of latency, voltage compatibility, and passive transparency.

Availability

SN74CB3T16210 is available at Aetrix Electronics and suitable for PCI interface isolation, USB 2.0 line sharing, and memory-interleaved bus architectures requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for SN74CB3T16210 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 decades of expertise in high-speed interface and power-efficient logic design.

The SN74CB3T16210 belongs to TI's Widebus™ family of advanced bus switches, engineered specifically for low-latency, mixed-voltage signal routing in computing, communications, and portable electronics.

FAQ

What is the maximum operating temperature range for the SN74CB3T16210?

The SN74CB3T16210 is rated for continuous operation from –40°C to +85°C ambient temperature. This industrial-grade range ensures reliable performance in embedded computing, networking equipment, and automotive infotainment systems where thermal margins are critical. All electrical specifications in the datasheet are guaranteed across this full range.

Does the SN74CB3T16210 support true bidirectional signal flow without direction control?

Yes, the SN74CB3T16210 provides fully bidirectional signal conduction between A and B ports with no direction pin required. When enabled (OE low), current flows equally well from A-to-B or B-to-A due to its symmetrical FET structure. This eliminates timing skew and control logic overhead found in directional transceivers, making it ideal for transparent bus isolation in protocols like USB and PCI.

Can the SN74CB3T16210 be used with a 2.5-V supply while interfacing to 5-V signals?

Yes, the SN74CB3T16210 supports 2.5-V VCC operation while accepting 0–5-V inputs on all I/O pins. With VCC = 2.5 V, it translates 5-V inputs down to ~2.5-V outputs, enabling direct connection between legacy 5-V peripherals and modern 2.5-V logic domains without external level shifters - a core feature confirmed in Figure 1 and the DC translation characteristics section.

How does the Ioff feature protect the SN74CB3T16210 during partial power-down?

The Ioff feature limits current to ≤10 μA when VCC = 0 V and any I/O is biased to 0–5.5 V, preventing damaging backflow through the device. In systems with staggered power rails - such as hot-pluggable modules or multi-rail SoCs - this ensures that powered-down sections of the SN74CB3T16210 do not load or disrupt active signal paths, preserving signal integrity and system reliability.

What is the recommended pull-up resistor value for OE pins on the SN74CB3T16210?

Texas Instruments recommends tying OE pins to VCC through a pull-up resistor to ensure high-impedance state during power-up or power-down. The minimum resistor value depends on the driver's current-sinking capability; for standard CMOS drivers, 10 kΩ is typical. This prevents undefined switch states and avoids bus contention before firmware initializes the enable control logic in the SN74CB3T16210.