Texas Instruments SN74CB3T16210DGVR

Overview

SN74CB3T16210 from Texas Instruments is a 20-bit FET bus switch IC supporting bidirectional level translation between 0–5 V signaling domains (e.g., 5-V TTL ↔ 3.3-V LVTTL ↔ 2.5-V CMOS), with 5-V-tolerant I/Os, 5 Ω typical ON-state resistance, and near-zero propagation delay (0.15 ns at 2.5 V). It serves as a low-power, high-speed isolation and voltage-level-shifting interface in mixed-voltage memory and peripheral buses.

For engineers reviewing the SN74CB3T16210 datasheet, SN74CB3T16210 pinout, SN74CB3T16210 application, or SN74CB3T16210 equivalent, key selection criteria include its dual 10-bit independent enable control (1OE/2OE), I_off-enabled partial-power-down capability, 2.3–3.6 V V_CC operation, 5 pF typical OFF-state I/O capacitance, and TVSOP-48 (DGV) package compatibility with space-constrained PCB layouts.

Technical Context

The SN74CB3T16210 implements two independent 10-bit FET-based transmission gates, each controlled by dedicated OE inputs (1OE, 2OE), enabling selective activation of either 10-bit segment or simultaneous 20-bit operation. Its gate drive architecture tracks V_CC, allowing output voltage translation to follow supply rail-e.g., 5-V input yields ~V_CC output when V_CC = 2.5 V or 3.3 V.

It supports true bidirectional signal flow with no direction pin, zero DC bias requirement, and robust 5-V tolerance on all I/Os regardless of V_CC state (powered up/down). The device incorporates undershoot clamp diodes on data/control inputs and meets JESD 17 latch-up immunity (>250 mA) and JESD 22 ESD ratings (2000-V HBM, 1000-V CDM).

Key Specifications

Pinout & Package

SN74CB3T16210DGVR uses the TVSOP-48 (DGV) package: 48-pin, 3.6 mm × 9.7 mm body, 0.4 mm pitch, 1.2 mm max height, JEDEC MO-153 compliant, RoHS-compliant NIPDAU lead 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 SN74CB3Q16210DGVR and SN74CBTLV16210DGVR, the SN74CB3T16210DGVR uniquely balances 5-V tolerance, 2.3–3.6 V flexibility, and 40 μA ultra-low ICC-making it the default choice for general-purpose mixed-voltage bus isolation where reliability across temperature and voltage margins is non-negotiable.

Availability

SN74CB3T16210DGVR is available at Aetrix Electronics and suitable for memory interleaving, PCI interface isolation, and USB 2.0 signal routing requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for SN74CB3T16210DGVR 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 power management ICs.

The SN74CB3T16210 belongs to TI's Widebus™ family of FET bus switches, designed specifically for low-latency, low-power, mixed-voltage signal routing in computing, communications, and industrial control systems.

FAQ

What is the maximum operating voltage on the I/O pins of the SN74CB3T16210DGVR?

The SN74CB3T16210DGVR supports a data I/O voltage range of 0 V to 5.5 V, with full 5-V tolerance regardless of V_CC state-including when powered down. This allows safe interfacing with 5-V TTL, 3.3-V LVTTL, and 2.5-V CMOS logic families without external protection circuitry. Absolute maximum rating is 7 V, but functional operation is specified up to 5.5 V.

Does the SN74CB3T16210DGVR support partial-power-down mode?

Yes, the SN74CB3T16210DGVR features I_off circuitry that limits current to 10 μA max when V_CC = 0 V, preventing damaging backflow from live I/Os into unpowered sections. This enables safe partial-power-down operation in mixed-rail systems-such as isolating a 3.3-V processor core while keeping 5-V peripherals active-without requiring external isolation switches.

Can the SN74CB3T16210DGVR be used as a 20-bit switch or only as two 10-bit switches?

The SN74CB3T16210DGVR can be configured flexibly: its two independent 10-bit banks (controlled by 1OE and 2OE) may operate separately-for example, isolating memory and peripheral buses-or simultaneously as a unified 20-bit path by tying both OE inputs low. Pin mapping and electrical specs (e.g., r_on, C_io) apply identically across all 20 bits, ensuring consistent performance in either configuration.

What is the typical ON-state resistance of the SN74CB3T16210DGVR and how does it vary with supply voltage?

The SN74CB3T16210DGVR has a typical ON-state resistance (r_on) of 5 Ω, measured at V_CC = 2.5 V and 3.3 V with 24 mA test current. At V_CC = 2.3 V, r_on remains ≤9.5 Ω; at V_CC = 3.6 V, it drops to ≤8.5 Ω. This low, supply-stable r_on ensures minimal voltage drop (<120 mV at 24 mA) and preserves signal swing integrity across its full 2.3–3.6 V operating range.

Is the SN74CB3T16210DGVR pin-compatible with other members of the Widebus™ 20-bit switch family?

Yes, the SN74CB3T16210DGVR shares identical pinout, package footprint (TVSOP-48), and terminal assignment with SN74CB3Q16210DGVR and SN74CBTLV16210DGVR-enabling direct PCB-level substitution. However, differences in r_on, ICC, I/O voltage tolerance, and temperature range mean functional equivalence requires validation per application requirements; the SN74CB3T16210DGVR remains the only variant rated for full 5-V I/O tolerance across –40°C to 85°C.