Texas Instruments SN74CB3Q16210DL

Overview

SN74CB3Q16210DL from Texas Instruments is a 20-bit, dual 10-bit FET bus switch with rail-to-rail analog/digital signal switching capability, 5 Ω typical ON-state resistance (ron), 4 pF typical OFF-state I/O capacitance, and support for 0 V to 5 V signaling across 2.3 V–3.6 V VCC. It enables high-bandwidth data path isolation in PCI and memory interleaving systems.

For engineers reviewing the SN74CB3Q16210DL datasheet, SN74CB3Q16210DL pinout, SN74CB3Q16210DL application, or SN74CB3Q16210DL equivalent, key selection considerations include its bidirectional 20-bit switching architecture, partial-power-down Ioff support, flat ron over voltage range, 0.25 ns typical propagation delay, and SSOP-48 package compatibility with high-density PCB layouts.

Technical Context

The SN74CB3Q16210DL implements two independent 10-bit FET bus switches with separate 1OE and 2OE controls, enabling either dual 10-bit or unified 20-bit operation. Its charge-pump gate drive ensures low, flat ron (5 Ω typ) across input voltages from 0 V to 5 V while maintaining rail-to-rail switching at 2.5 V and 3.3 V VCC.

Each switch supports bidirectional data flow with near-zero propagation delay (0.25 ns max), 20 MHz maximum OE switching frequency, and Ioff protection that blocks backflow current during partial power-down. Input/output pins tolerate −0.5 V to 7 V, and control inputs accept TTL or 5-V/3.3-V CMOS logic levels.

Key Specifications

Pinout & Package

SN74CB3Q16210DL uses a 48-pin SSOP (DL) package with 0.5 mm pitch, 12.4 mm × 6.2 mm body size, and 1.2 mm max height per JEDEC MO-153. Pin 1 is located at top-left corner with notch marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CB3Q16210DL, SN74CB3T16210DL trades bandwidth for broader supply flexibility, while TS3DV642AIZAYR offers higher density and ESD robustness at the expense of partial-power-down capability and mixed-voltage signaling - making SN74CB3Q16210DL optimal for high-fidelity, hot-pluggable 20-bit bus isolation.

Availability

SN74CB3Q16210DL is available at Aetrix Electronics and suitable for PCI interface design, memory interleaving architectures, and high-speed bus arbitration systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant SSOP packaging.

Supply support for SN74CB3Q16210DL 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 connectivity technologies, with decades of expertise in high-speed interface solutions.

The SN74CB3Q16210DL belongs to TI's Widebus™ FET bus switch family, engineered specifically for low-distortion, high-bandwidth signal routing in computing, communications, and industrial control infrastructure.

FAQ

What is the maximum signal frequency supported by the SN74CB3Q16210DL?

The SN74CB3Q16210DL supports signal paths up to 500 MHz, as validated by its low 5 Ω typical ON-state resistance and 4 pF OFF-state I/O capacitance - enabling minimal insertion loss and preserved edge rates in high-speed digital and analog applications. This performance is specified under recommended operating conditions with VCC = 3.3 V and TA = 25°C.

Does the SN74CB3Q16210DL support partial power-down operation?

Yes, the SN74CB3Q16210DL features Ioff circuitry that limits current backflow to ≤1 µA when VCC = 0 V, ensuring safe isolation during partial power-down sequences. This capability is critical for hot-swap systems and allows the SN74CB3Q16210DL to maintain high-impedance state even when unpowered while other system rails remain active.

Can the SN74CB3Q16210DL interface between 1.8 V and 5 V logic domains?

Yes, the SN74CB3Q16210DL supports 0 V to 5.5 V signaling on all data I/O ports regardless of VCC (2.3–3.6 V), enabling direct level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V domains without external components. Its rail-to-rail switching architecture ensures full logic swing preservation across these interfaces.

What is the recommended power-up sequence for the SN74CB3Q16210DL?

To ensure high-impedance state at power-up, OE pins must be held high via pull-up resistors to VCC; the minimum resistor value depends on the driver's sink capability. VCC should be applied before or concurrently with input signals, and all unused control inputs must be tied to VCC or GND - per TI application report SCBA004 - to prevent floating-node-induced malfunction of the SN74CB3Q16210DL.

Is the SN74CB3Q16210DL pin-compatible with other members of the CB3Q family?

Yes, the SN74CB3Q16210DL shares identical pinout and functionality with other CB3Q 20-bit bus switches in DL, DGG, and DGV packages (e.g., SN74CB3Q16210DGGR), allowing drop-in replacement across package variants. All share the same 48-pin layout, terminal assignments, and electrical behavior - simplifying layout reuse and sourcing flexibility for the SN74CB3Q16210DL.