Texas Instruments SN74ALVCH162827DGG

Overview

SN74ALVCH162827 from Texas Instruments is a 20-bit noninverting buffer/driver with 3-state outputs, designed for 1.65-V to 3.6-V V_CC operation. It features two independent 10-bit sections, each with dual output-enable inputs (OE1/OE2), bus-hold circuitry on all data inputs, and integrated 26-Ω series output resistors-enabling clean signal integrity in high-speed bus applications such as memory address/data buffering in industrial control backplanes.

For engineers reviewing the SN74ALVCH162827 datasheet, SN74ALVCH162827 pinout, SN74ALVCH162827 application, or SN74ALVCH162827 equivalent, key selection considerations include its dual-section 3-state control logic, bus-hold elimination of external pull resistors, 12-mA sink capability per output, and DGG package thermal performance (θ_JA = 81°C/W).

Technical Context

This device implements a dual 10-bit noninverting buffer architecture with independent OE1/OE2 control per section: both enables must be low for Y outputs to drive; either high forces high-impedance state. The EPIC™ submicron CMOS process delivers fast propagation delay (t_pd ≤ 3.8 ns at V_CC = 3.3 V) and low dynamic power consumption.

Each output integrates a 26-Ω series resistor to suppress overshoot/undershoot without external components. Bus-hold circuitry maintains valid logic levels on floating inputs, eliminating need for external pullup/pulldown resistors-critical for hot-swap and partial-power-down scenarios in modular systems.

Key Specifications

Pinout & Package

SN74ALVCH162827 is packaged in a 56-pin Thin Shrink Small-Outline (DGG) package with 0.5-mm pitch and 12.5-mm × 6.1-mm body size. Pin layout supports dual 10-bit sections with dedicated V_CC/GND pairs per section for noise isolation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16244ADGGR, SN74ALVCH162827 provides 4 extra bits, bus-hold, and full 1.65–3.6-V characterization-making it superior for floating-input or mixed-voltage industrial buses. Against SN74ALVCH162244DGGR, it offers noninverting logic with identical footprint and thermal behavior-ideal where signal polarity must be preserved.

Availability

SN74ALVCH162827 is available at Aetrix Electronics and suitable for industrial PLC backplanes, memory expansion modules, hot-swappable I/O carriers, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74ALVCH162827 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 decades of expertise in high-reliability industrial and automotive-grade components.

The SN74ALVCH162827 belongs to TI's Widebus™ family of advanced bus-interface logic, engineered specifically for high-speed, low-noise parallel data transmission in industrial automation, communications infrastructure, and test instrumentation.

FAQ

What is the minimum V_CC required for guaranteed operation of the SN74ALVCH162827?

The SN74ALVCH162827 is fully characterized and guaranteed to operate from 1.65 V to 3.6 V. At V_CC = 1.65 V, VIH is specified as 0.65 × V_CC (≥1.07 V) and VOL ≤ 0.45 V with IOL = 2 mA. This makes SN74ALVCH162827 suitable for ultra-low-voltage industrial systems where power efficiency is critical without sacrificing timing margin.

Does the SN74ALVCH162827 require external pull-up resistors on its OE inputs?

No-external pull-up resistors are not required on OE inputs of the SN74ALVCH162827. However, TI recommends tying OE to V_CC through a pull-up resistor during power-up/down to ensure outputs remain in high-impedance state. The minimum resistor value depends on the driver's current-sinking capability, but typical values range from 4.7 kΩ to 10 kΩ for robust noise immunity.

How does the bus-hold feature function on the SN74ALVCH162827 data inputs?

The SN74ALVCH162827 incorporates active bus-hold circuitry on all A-inputs (1A1–1A10, 2A1–2A10), which detects the last valid logic state and applies weak feedback to maintain it-eliminating floating inputs. At V_CC = 2.3 V, bus-hold current is ±45 µA, sufficient to override typical PCB leakage while consuming negligible quiescent power. This removes the need for external pull resistors in unpopulated or partially loaded bus configurations.

Can the SN74ALVCH162827 drive standard 50-pF transmission lines directly?

Yes-the SN74ALVCH162827 can drive 50-pF loads directly. Its outputs are rated for ±12 mA at V_CC = 3.0 V, and electrical characteristics confirm VOL ≤ 0.55 V and VOH ≥ 2.4 V under that condition. With integrated 26-Ω series resistors, it achieves controlled edge rates and suppresses reflections-making SN74ALVCH162827 suitable for point-to-point or short stub bus topologies without additional termination.

What is the thermal performance of the SN74ALVCH162827 in the DGG package?

The SN74ALVCH162827 in the DGG package has a junction-to-ambient thermal resistance (θ_JA) of 81°C/W under standard JEDEC conditions. This value assumes a 1-inch² copper pad on the PCB with no airflow. For continuous operation at 3.3 V and full 20-bit toggle, power dissipation remains below 50 mW-well within safe thermal limits. Derating is recommended above 70°C ambient to maintain reliability.