Texas Instruments SN74CBTLV16800VR

Overview

SN74CBTLV16800VR from Texas Instruments is a low-voltage 20-bit FET bus switch with precharged B-port outputs, designed for high-speed data routing in 2.3-V to 3.6-V systems. It features dual 10-bit independent switching channels, 5-Ω typical on-state resistance, rail-to-rail signal handling, and I_off support for partial-power-down operation. Used in hot-swap backplane interfaces and memory expansion subsystems.

For engineers reviewing the SN74CBTLV16800VR datasheet, SN74CBTLV16800VR pinout, SN74CBTLV16800VR application, or SN74CBTLV16800VR equivalent, key selection criteria include precharge bias voltage (BIASV) configuration, 48-pin TVSOP package compatibility, live-insertion noise suppression capability, and 0.15–0.25 ns propagation delay at 3.3 V.

Technical Context

The SN74CBTLV16800VR implements two independent 10-bit FET-based transmission gates controlled by separate 1OE and 2OE inputs. Each channel connects A-port to B-port when its OE is low, and places B-port in high-impedance state precharged to BIASV via ~10-kΩ equivalent resistor when OE is high.

Its architecture supports rail-to-rail analog/digital signal switching with minimal distortion during live insertion, enabled by user-configurable BIASV (1.3 V to V_CC). The device meets JESD 78 Class II latch-up immunity (>100 mA) and exceeds JESD 22 ESD ratings (2000-V HBM, 200-V MM).

Key Specifications

Pinout & Package

SN74CBTLV16800VR is housed in a 48-pin TVSOP (DGV) package with 0.4-mm pitch, 12.4 mm × 6.1 mm body size, and maximum height of 1.2 mm - optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBTLV16800VR, SN74CBTLV3861RGYR offers half the channel count and no precharge, limiting live-insertion use; SN74CBT16210DGGR requires 5-V operation and lacks partial-power-down support, making it unsuitable for modern low-voltage embedded systems.

Availability

SN74CBTLV16800VR is available at Aetrix Electronics and suitable for hot-swap backplane interfaces, memory expansion subsystems, and PCIe lane multiplexing requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for SN74CBTLV16800VR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The SN74CBTLV16800VR belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for low-voltage, high-bandwidth signal routing in live-insertion and mixed-rail systems.

FAQ

What is the recommended pull-up resistor value for OE pins on the SN74CBTLV16800VR?

The minimum pull-up resistor value for 1OE and 2OE on the SN74CBTLV16800VR is determined by the current-sinking capability of the driving source. TI specifies that OE should be tied to V_CC through a pullup resistor to ensure high-impedance state during power-up or power-down. While exact values depend on driver strength, typical designs use 4.7-kΩ to 10-kΩ resistors for 3.3-V systems. This ensures reliable disable behavior without excessive current draw, and is validated in TI application report SCBA004.

Can the SN74CBTLV16800VR operate with BIASV set to 0 V (GND)?

Yes, the SN74CBTLV16800VR supports BIASV = GND as a valid configuration. The datasheet explicitly lists BIASV = GND in timing test conditions for t_PZH and t_PHZ, confirming functional operation. When BIASV = GND, the B-port outputs are precharged to 0 V during disable, which helps suppress positive-going transients during live insertion. However, this setting may increase ground bounce in systems with heavy B-port capacitance; TI recommends evaluating noise margins in the target application.

Does the SN74CBTLV16800VR support 1.8-V logic levels on its control inputs?

No, the SN74CBTLV16800VR does not guarantee operation with 1.8-V control inputs. Its recommended operating conditions specify V_IL = 0.7 V (min) and V_IH = 1.7 V (min) at V_CC = 2.3–2.7 V, meaning a 1.8-V logic high meets the threshold but falls outside the tested range. TI characterizes performance only for V_CC ≥ 2.3 V, and 1.8-V signaling may result in marginal noise immunity or undefined timing. For true 1.8-V compatibility, consider TI's SN74LVC1G3157 or similar LVC-family switches.

How does the I_off specification of the SN74CBTLV16800VR protect system-level power domains?

The I_off specification of the SN74CBTLV16800VR limits leakage current to ≤10 µA when V_CC = 0 V and any I/O pin is biased between 0 V and 3.6 V. This prevents damaging backflow current from powered downstream circuits into an unpowered SN74CBTLV16800VR, enabling safe partial-power-down operation. In practice, this allows subsystems like memory banks or peripheral interfaces to be powered down independently while maintaining isolation - a critical requirement in energy-efficient embedded and telecom equipment where SN74CBTLV16800VR is deployed.

Is the SN74CBTLV16800VR pin-compatible with other members of the Widebus™ 20-bit switch family?

Yes, the SN74CBTLV16800VR shares identical pinout and functionality with SN74CBTLV16800DL and SN74CBTLV16800GR - all three variants use the same 48-pin layout across TVSOP (DGV), TSSOP (DGG), and SSOP (DL) packages. Pin assignments for 1A1–1A10, 1B1–1B10, 2A1–2A10, 2B1–2B10, 1OE, 2OE, BIASV, V_CC, and GND are fully aligned. This allows direct substitution between packages without PCB redesign, provided thermal and mechanical constraints are met for the chosen variant.