Texas Instruments SN74ALVTH16827VR

Overview

SN74ALVTH16827VR from Texas Instruments is a 20-bit noninverting buffer/driver with 3-state outputs, designed for 2.5-V/3.3-V operation and mixed-mode (5-V tolerant) interfacing. It delivers ±32/64 mA drive at 3.3 V, features bus-hold on all data inputs, auto-3-state detection, and high-impedance during power-up/down. It is used in backplane and motherboard bus interface applications requiring level translation and hot-swap capability.

For engineers reviewing the SN74ALVTH16827VR datasheet, SN74ALVTH16827VR pinout, SN74ALVTH16827VR application, or SN74ALVTH16827VR equivalent, key selection considerations include its dual 10-bit sections with independent OE control, TVSOP-56 (DGV) package, 3.3-V-compatible 5-V-tolerant I/O, and bus-hold functionality eliminating external pull resistors.

Technical Context

The SN74ALVTH16827VR implements an Advanced BiCMOS Technology (ABT) Widebus™ architecture optimized for low static power and high-speed switching noise suppression via distributed V_CC/GND pins and flow-through layout. Its two independent 10-bit sections each use paired output-enable inputs (e.g., 1OE1/1OE2) requiring both low to activate outputs - enabling fine-grained bus control.

It supports true mixed-signal operation: inputs accept 0–5.5 V regardless of V_CC (2.3–3.6 V), and outputs drive 5-V buses while powered from 2.5 V or 3.3 V. Bus-hold circuitry sustains valid logic levels on floating inputs (IBHL ≥ 75 µA at V_IL = 0.8 V, IBHH ≤ –75 µA at V_IH = 2 V), and auto-3-state disables outputs when V_O > V_CC + 0.5 V.

Key Specifications

Pinout & Package

SN74ALVTH16827VR is packaged in a 56-pin Thin Very Small-Outline Package (TVSOP, DGV), 11.4 mm × 4.4 mm × 1.2 mm max height, JEDEC MO-194 compliant, with gull-wing leads and exposed thermal pad (non-electrical).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 20-bit 3-state buffer applications.

Compared with SN74ALVTH16827VR, SN74ALVCH16827VR reduces solution cost but increases BOM complexity and risk of floating-input faults, while SN74LVC16T245DGGR adds direction control overhead and lacks auto-3-state protection - making SN74ALVTH16827VR optimal for fixed-direction, hot-swap-capable 3.3-V-to-5-V bus isolation.

Availability

SN74ALVTH16827VR is available at Aetrix Electronics and suitable for backplane buffering, industrial I/O expansion, server memory interface, and automotive diagnostic gateway applications requiring stable component supply and long-term obsolescence management.

Supply support for SN74ALVTH16827VR 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 since 1930.

The SN74ALVTH16827VR belongs to TI's ALVTH Widebus™ family, engineered specifically for high-speed, low-noise, mixed-voltage parallel bus interfacing in telecom infrastructure, enterprise servers, and programmable logic systems.

FAQ

What is the maximum output drive capability of the SN74ALVTH16827VR at 3.3 V?

The SN74ALVTH16827VR delivers –32 mA (high-to-low) and +64 mA (low-to-high) output drive at V_CC = 3.3 V, as specified under recommended operating conditions with I_OL = 32 mA and I_OH = –32 mA. This enables direct connection to multiple TTL loads or 50-pF transmission lines without external buffers. The SN74ALVTH16827VR maintains this drive strength across its full operating temperature range of –40°C to 85°C.

Does the SN74ALVTH16827VR support hot-swap or live insertion?

Yes, the SN74ALVTH16827VR supports live insertion: its outputs enter high-impedance state when V_CC is below 1.2 V (during power-up/down), and it exhibits zero current draw (I_OFF ≤ ±100 µA) when powered off. This prevents bus conflicts and back-driving in modular systems. The SN74ALVTH16827VR also features auto-3-state that disables outputs if V_O exceeds V_CC + 0.5 V - critical for safe hot-plug in backplane environments.

How does the bus-hold function work on the SN74ALVTH16827VR inputs?

The SN74ALVTH16827VR integrates active bus-hold circuitry on all 20 data inputs (1A1–1A10, 2A1–2A10), which sources or sinks ≥75 µA to maintain a valid logic level when inputs float. At V_IL = 0.8 V, it sinks ≥75 µA (IBHL); at V_IH = 2 V, it sources ≤–75 µA (IBHH). This eliminates the need for external 10-kΩ pullup/pulldown resistors, reducing BOM count and PCB area - a key advantage confirmed in the SN74ALVTH16827VR datasheet Section 1.

What package type is used for the SN74ALVTH16827VR, and what are its key mechanical features?

The SN74ALVTH16827VR uses the TVSOP-56 (DGV) package: 11.4 mm × 4.4 mm × 1.2 mm max height, 0.4-mm lead pitch, JEDEC MO-194 compliant, with gull-wing leads and an exposed thermal pad (non-electrical). Its flow-through pinout and distributed V_CC/GND pins reduce switching noise - verified in the SN74ALVTH16827VR mechanical drawing MPDS006C and package addendum.

Can the SN74ALVTH16827VR interface between 3.3-V and 5-V logic systems?

Yes, the SN74ALVTH16827VR is explicitly designed for mixed-mode operation: its inputs tolerate 0–5.5 V regardless of V_CC (2.3–3.6 V), and its outputs drive 5-V buses while powered from 3.3 V. This enables direct 3.3-V-to-5-V interfacing without level shifters - a core feature documented in the SN74ALVTH16827VR datasheet title, description, and absolute maximum ratings (VI up to 7 V).