Texas Instruments SN74CBT16210CDLR

Overview

SN74CBT16210CDLR from Texas Instruments is a 20-bit TTL-compatible FET bus switch organized as two independent 10-bit bidirectional switches, featuring 3 Ω typical ON-state resistance, <0.24 ns propagation delay at 4 V, and −2 V undershoot protection on A/B ports. It operates from 4 V to 5.5 V and supports mixed-voltage signaling (0.8 V to 5 V) in PCI interface and memory interleaving applications.

For engineers reviewing the SN74CBT16210CDLR datasheet, SN74CBT16210CDLR pinout, SN74CBT16210CDLR application, or SN74CBT16210CDLR equivalent, key selection criteria include Ioff-enabled partial-power-down capability, 5.5 pF OFF-state I/O capacitance for low signal distortion, and dual OE-controlled isolation for bus gating in high-speed digital systems.

Technical Context

The SN74CBT16210CDLR implements two independent 10-bit FET-based analog/digital bus switches with separate 1OE and 2OE control inputs. Each switch provides bidirectional conduction when enabled, with near-zero propagation delay governed by the RC time constant of ron (3 Ω typical) and load capacitance.

Its undershoot-protection circuitry actively clamps A/B port voltages down to −2 V while maintaining OFF-state isolation, and Ioff functionality prevents backflow current during partial power-down-ensuring system-level robustness in hot-swap and mixed-rail environments.

Key Specifications

Pinout & Package

SN74CBT16210CDLR is housed in a 48-pin SSOP (DL) package measuring 12.6 mm × 6.1 mm × 2.3 mm, with 0.5-mm pitch gull-wing leads compliant with JEDEC MO-153.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT16210CDLR, SN74CBTD16210DGGR adds bus-hold but increases quiescent current, while 74ALVC164245DGGR sacrifices bidirectionality and transient protection for level-shifting functionality-making SN74CBT16210CDLR uniquely suited for low-delay, mixed-voltage, hot-pluggable bus isolation.

Availability

SN74CBT16210CDLR is available at Aetrix Electronics and suitable for PCI interface isolation, memory interleaving control, and low-distortion signal gating requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74CBT16210CDLR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The SN74CBT16210CDLR belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for low-latency, bidirectional signal routing in mixed-voltage digital systems with stringent transient immunity requirements.

FAQ

What is the maximum undershoot voltage the SN74CBT16210CDLR can withstand on its A/B ports?

The SN74CBT16210CDLR features active undershoot-protection circuitry that clamps A and B port voltages down to −2 V while maintaining proper OFF-state isolation. This specification is verified per the absolute maximum ratings table and confirmed in the undershoot characteristics section of the datasheet, ensuring reliable operation during negative transients common in hot-swap and cable-disconnect scenarios. The SN74CBT16210CDLR maintains functional integrity without latch-up or data corruption at this level.

Does the SN74CBT16210CDLR support bidirectional signal flow in both 10-bit sections simultaneously?

Yes, the SN74CBT16210CDLR supports fully independent bidirectional signal flow across both 10-bit sections: Group 1 (1A1–1A10 ↔ 1B1–1B10) and Group 2 (2A1–2A10 ↔ 2B1–2B10). Each group is controlled by its own active-low output-enable input (1OE and 2OE), allowing simultaneous or staggered switching. The SN74CBT16210CDLR's FET architecture ensures symmetrical ron and timing in either direction, with no internal directionality constraint.

What is the recommended practice for OE pin handling during power-up to ensure high-impedance state?

To guarantee high-impedance isolation during power-up or power-down, OE pins (1OE and 2OE) of the SN74CBT16210CDLR must be tied to VCC through an external pullup resistor. The minimum resistor value depends on the driving source's current-sinking capability, as specified in the datasheet's application guidance. This prevents undefined switch states and eliminates bus contention risks. The SN74CBT16210CDLR relies on this external biasing since it lacks internal pullups.

Can the SN74CBT16210CDLR be used to switch analog signals such as clocks or reset lines?

Yes, the SN74CBT16210CDLR is explicitly characterized for analog applications including clock and reset signal gating. Its low 3 Ω typical ron, flat resistance vs. voltage curve, and low 14.5 pF Cio(ON) minimize amplitude loss and edge degradation. The SN74CBT16210CDLR has been validated in low-distortion signal gating applications per its official description, supporting frequencies up to 200 MHz with negligible jitter addition when properly terminated.

What package type and lead count does the SN74CBT16210CDLR use?

The SN74CBT16210CDLR uses a 48-pin SSOP (Shrink Small-Outline Package) with designation DL, measuring 12.6 mm × 6.1 mm × 2.3 mm and featuring 0.5-mm pitch gull-wing leads. This package complies with JEDEC MO-153 and is optimized for automated surface-mount assembly. The SN74CBT16210CDLR is supplied in tape-and-reel format with 1000 units per reel, and carries the top-side marking "CBT16210C".