Texas Instruments SN74CBTLV16800DLR

Overview

SN74CBTLV16800DLR from Texas Instruments is a low-voltage 20-bit FET bus switch with precharged B-port outputs, 5-Ω on-state resistance, rail-to-rail switching, and I_off support for partial-power-down mode - used in hot-pluggable backplane and modular system interconnects.

For engineers reviewing the SN74CBTLV16800DLR datasheet, SN74CBTLV16800DLR pinout, SN74CBTLV16800DLR application, or SN74CBTLV16800DLR equivalent, this page delivers verified electrical specs, dual 10-bit switch behavior, BIASV-controlled precharge timing, SSOP-48 package details, and real-world live-insertion noise mitigation design guidance.

Technical Context

The SN74CBTLV16800DLR implements two independent 10-bit FET bus switches, each controlled by a dedicated OE input (1OE/2OE), enabling flexible 10-bit or consolidated 20-bit data path routing. Its MOSFET-based switch architecture delivers sub-nanosecond propagation delay (0.15–0.25 ns at V_CC = 2.5/3.3 V) and rail-to-rail signal swing across A and B ports.

Each B-port output is internally precharged to a user-supplied BIASV voltage (1.3 V to V_CC) via ~10-kΩ equivalent resistance, minimizing floating-bus transients during live insertion. The device fully supports I_off protection: when V_CC = 0 V, leakage remains ≤10 µA over full input/output voltage range (0–3.6 V), ensuring isolation and preventing backdrive damage.

Key Specifications

Pinout & Package

SN74CBTLV16800DLR uses a 48-pin SSOP (Shrink Small-Outline Package) with 0.5-mm pitch, 12.4 × 7.9 mm body size, and 1.2-mm max height per JEDEC MO-153. Pin 1 is located in Quadrant Q1 of the tape reel.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBTLV16800DLR, SN74CBT16210DLR offers identical package and footprint but halves channel count and removes BIASV-driven noise control, while SN74LVC1G3157DCKR provides no integrated multi-bit coordination, requiring complex layout and control logic to emulate 20-bit behavior.

Availability

SN74CBTLV16800DLR is available at Aetrix Electronics and suitable for modular backplane interconnects, hot-swappable I/O card interfaces, and memory expansion subsystems requiring stable component supply, long-term lifecycle assurance, and consistent SSOP-48 sourcing.

Supply support for SN74CBTLV16800DLR 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 with emphasis on reliability, scalability, and industrial-grade qualification.

The SN74CBTLV16800DLR belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for low-distortion, low-latency data path control in live-insertion and partial-power-down systems.

FAQ

What is the maximum recommended operating voltage for SN74CBTLV16800DLR?

The SN74CBTLV16800DLR has a recommended V_CC operating range of 2.3 V to 3.6 V. Absolute maximum ratings allow up to 4.6 V, but sustained operation above 3.6 V risks parametric shift and reduced reliability. All electrical characteristics-including r_on, t_pd, and I_off-are specified and guaranteed only within the 2.3–3.6 V window. Operating SN74CBTLV16800DLR outside this range voids performance compliance per the SCDS045J datasheet.

How does the BIASV pin function in SN74CBTLV16800DLR during live insertion?

In SN74CBTLV16800DLR, the BIASV pin supplies a user-defined voltage (1.3 V to V_CC) that precharges all B-port outputs through an internal ~10-kΩ resistor when OE is high. During live insertion, this prevents B-port lines from floating, eliminating ground bounce, crosstalk, and false triggering on downstream receivers. The precharge level must match the expected logic threshold of connected devices - for example, 2.4 V for 3.3 V LVTTL systems - and must be stable before card engagement.

Can SN74CBTLV16800DLR be used as a single 20-bit switch instead of two 10-bit switches?

Yes, SN74CBTLV16800DLR can operate as a unified 20-bit bus switch by tying 1OE and 2OE together to a common control signal. When both OEs are low, all 20 A-B paths conduct simultaneously with matched r_on and t_pd. This configuration maintains timing coherence across the full bus width and is explicitly supported in the device's functional description and logic diagram. No external components are required beyond the shared OE net.

What is the thermal resistance (θ_JA) of SN74CBTLV16800DLR in its SSOP-48 package?

The SN74CBTLV16800DLR in the DL (SSOP-48) package has a junction-to-ambient thermal resistance (θ_JA) of 63°C/W, as specified in the Absolute Maximum Ratings table. This value assumes standard JEDEC 2-layer board conditions (1-inch² copper pad, 2 oz Cu). For high-density or thermally constrained layouts, thermal vias under the exposed pad (if present) or increased copper area can reduce effective θ_JA, but the rated 63°C/W must be used for worst-case junction temperature calculation in SN74CBTLV16800DLR thermal design.

Does SN74CBTLV16800DLR support hot-swap without external protection circuitry?

SN74CBTLV16800DLR supports hot-swap at the signal integrity level via BIASV precharge and I_off isolation, but it does not replace system-level hot-swap controllers for inrush current limiting or voltage ramp control. The device prevents data corruption and backdrive damage during insertion, yet external TVS diodes, current-limiting resistors, and sequencing ICs remain necessary for full IEEE 1394 or PCI Hot-Plug compliance. SN74CBTLV16800DLR is a key enabler-not a complete solution-for hot-swap-capable designs.