Texas Instruments SN74ALVTH16827DLR

Overview

SN74ALVTH16827DLR 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 interfacing (5-V inputs/outputs). It delivers ±24 mA/±32 mA drive at 2.5 V/3.3 V, features bus-hold on all data inputs, auto-3-state, and power-off high-impedance-enabling reliable backplane and memory interface buffering in industrial control systems.

For engineers reviewing the SN74ALVTH16827DLR datasheet, SN74ALVTH16827DLR pinout, SN74ALVTH16827DLR application, or SN74ALVTH16827DLR equivalent, key selection criteria include its dual 10-bit sections with independent OE pairs, flow-through pinout for PCB routing, distributed VCC/GND for noise suppression, and guaranteed high-impedance during power-up/down.

Technical Context

The SN74ALVTH16827DLR implements two independent 10-bit buffer sections, each controlled by two active-low output-enable inputs (e.g., 1OE1 and 1OE2); both must be low for that section's Y outputs to drive. Its Advanced BiCMOS Technology (ABT) enables TTL-level compatibility with 5-V systems while operating from 2.3 V to 3.6 V VCC.

Bus-hold circuitry eliminates external pullup/pulldown resistors on all 20 data inputs, and auto-3-state disables outputs when VO exceeds VCC + 0.5 V-preventing bus contention without external logic. Power-off output disable and <1.2 V power-up high-impedance ensure safe live insertion and hot-swap capability.

Key Specifications

Pinout & Package

SN74ALVTH16827DLR uses a 56-pin Plastic Shrink Small-Outline (SSOP-DL) package with 0.5-mm pitch, 11.4 mm × 4.4 mm body, and 1.2 mm max height. Pin layout follows flow-through architecture: inputs (A) and outputs (Y) are interleaved across opposing sides, with distributed VCC and GND pins minimizing switching noise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVCH16827GR and SN74LVC16245ADGGR, SN74ALVTH16827DLR uniquely combines 5-V tolerant inputs, bus-hold, auto-3-state, and live-insertion support-making it the only option for robust mixed-voltage backplane interfaces requiring zero external biasing and fail-safe hot-swap behavior.

Availability

SN74ALVTH16827DLR is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory subsystem buffering, hot-swappable module designs, and automated test equipment signal conditioning requiring stable component supply and long-term obsolescence management.

Supply support for SN74ALVTH16827DLR 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 logic solutions with over 50 years of innovation in high-reliability interface ICs.

The ALVTH family was engineered for mixed-signal system integration-specifically targeting 2.5-V/3.3-V logic interfacing with legacy 5-V infrastructure in industrial automation, telecom infrastructure, and test equipment.

FAQ

What is the maximum output current capability of the SN74ALVTH16827DLR at 3.3 V VCC?

The SN74ALVTH16827DLR provides –32 mA source current and +64 mA sink current per output at VCC = 3.3 V, as specified under recommended operating conditions with IOL duty cycle ≤ 50% and f ≥ 1 kHz. This high drive strength allows direct interfacing with terminated transmission lines or multiple CMOS/TTL loads without external amplification. The SN74ALVTH16827DLR maintains this rating across its full operating temperature range of –40°C to 85°C.

Does the SN74ALVTH16827DLR support 5-V input signals while operating at 2.5 V VCC?

Yes, the SN74ALVTH16827DLR supports 5-V input signals across its full input voltage range of –0.5 V to 5.5 V, regardless of whether VCC is 2.5 V or 3.3 V. This mixed-mode capability is inherent to its Advanced BiCMOS Technology (ABT) design and eliminates the need for external level-shifting circuitry when interfacing with legacy 5-V logic. The SN74ALVTH16827DLR also tolerates 5-V outputs in high-impedance or power-off states.

How does the bus-hold feature function on the SN74ALVTH16827DLR inputs?

The SN74ALVTH16827DLR integrates bus-hold circuitry on all 20 data inputs (A pins), providing ±75 µA sustaining current at VCC = 3 V to actively hold floating or unterminated inputs at valid logic levels-eliminating the need for external pullup or pulldown resistors. Bus-hold activates automatically; no configuration is required. The SN74ALVTH16827DLR ensures stable logic states during power-up, reset, or tri-state conditions without board-level components.

What is the purpose of auto-3-state in the SN74ALVTH16827DLR, and how is it triggered?

Auto-3-state in the SN74ALVTH16827DLR automatically places outputs in high-impedance when the output voltage exceeds VCC + 0.5 V-preventing bus contention when driving into overvoltage conditions or mismatched termination. It requires no external control signal and operates independently per output. This feature enhances system reliability in hot-swap and multi-driver bus environments. The SN74ALVTH16827DLR implements auto-3-state using internal voltage comparators tied directly to each Y pin.

Is the SN74ALVTH16827DLR pin-compatible with other devices in the ALVTH16827 family?

Yes, the SN74ALVTH16827DLR shares identical pinout and functionality with other package variants of the same device (e.g., SN74ALVTH16827DGV and SN74ALVTH16827DGG), as confirmed by TI's official package drawings and functional descriptions. All ALVTH16827 variants use the same 56-pin flow-through architecture, dual 10-bit section organization, and identical OE/A/Y signal mapping. The SN74ALVTH16827DLR is not pin-compatible with non-ALVTH 16-bit buffers such as the SN74LVC16245A.