Texas Instruments SN74ALVCH16825DGGR

Overview

SN74ALVCH16825DGGR from Texas Instruments is an 18-bit noninverting 3-state buffer/driver with bus-hold circuitry, designed for 1.65-V to 3.6-V V_CC operation. It supports dual 9-bit or single 18-bit configurations, features two independent 2-input AND-type output-enable controls (active-low), and operates across –40°C to 85°C for memory address, clock, and bus interface applications.

For engineers reviewing the SN74ALVCH16825DGGR datasheet, SN74ALVCH16825DGGR pinout, SN74ALVCH16825DGGR application, or SN74ALVCH16825DGGR equivalent, key selection criteria include V_CC range compatibility, bus-hold input retention, 3-state timing (t_en/t_dis), thermal impedance (θ_JA = 81°C/W), and TSSOP-56 package constraints.

Technical Context

This device implements two independent 9-bit sections, each with separate active-low OE inputs (OE1/OE2 per section) feeding a 2-input AND gate to control all nine outputs simultaneously. Bus-hold circuitry maintains valid logic levels on floating data inputs without external resistors, reducing BOM count and layout complexity.

Output drive strength scales with V_CC: ±24 mA at 3.0 V, ±12 mA at 2.3–2.7 V, and ±4 mA at 1.65 V. Propagation delay (t_pd) is 3.4 ns typical at V_CC = 2.3 V and CL = 50 pF, while enable/disable times (t_en/t_dis) are 4.7–6.0 ns under same conditions.

Key Specifications

Pinout & Package

TSSOP-56 (DGG) package: 13.9 mm × 6.1 mm × 1.2 mm body, 0.5-mm lead pitch, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 18-bit 3-state buffer applications.

Compared with SN74ALVCH16825DGGR, SN74LVC16245ADGGR reduces component count but increases layout sensitivity to floating nodes, while SN74AVC16835DGGR improves timing margin at the cost of added termination complexity and higher dynamic power.

Availability

SN74ALVCH16825DGGR is available at Aetrix Electronics and suitable for memory subsystems, clock distribution networks, industrial backplanes, and I/O expansion modules requiring stable component supply across extended temperature ranges.

Supply support for SN74ALVCH16825DGGR 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 specializing in analog, embedded processing, and logic solutions with over 50 years of innovation in high-reliability interface ICs.

The SN74ALVCH16825DGGR belongs to TI's Widebus™ family of high-density bus interface devices, engineered specifically for low-voltage, high-speed memory and peripheral interconnect in industrial and computing systems.

FAQ

What is the minimum V_CC voltage required for reliable operation of the SN74ALVCH16825DGGR?

The SN74ALVCH16825DGGR is fully characterized down to 1.65 V, with guaranteed performance across its entire operating range (1.65 V to 3.6 V). At 1.65 V, it delivers ±4 mA output drive and maintains bus-hold functionality with ±25 µA hold current. Operation below 1.65 V is not specified and may result in undefined logic states or increased static current.

Does the SN74ALVCH16825DGGR require external pullup resistors on its input pins?

No. The SN74ALVCH16825DGGR integrates active bus-hold circuitry on all data inputs (1A1–1A9, 2A1–2A9), which maintains valid logic levels on unused or floating inputs without external components. This eliminates the need for 18 discrete pullup/pulldown resistors, simplifying layout and reducing BOM cost.

How does the 3-state enable logic work on the SN74ALVCH16825DGGR?

The SN74ALVCH16825DGGR uses two independent 2-input AND gates per 9-bit section: outputs Y1–Y9 go high-impedance if either 1OE1 or 1OE2 is high; similarly, Y10–Y18 go high-impedance if either 2OE1 or 2OE2 is high. To guarantee high-Z during power-up, TI recommends tying all OE pins to V_CC through a pullup resistor sized per the driver's sink capability.

Can the SN74ALVCH16825DGGR be used in mixed-voltage systems?

Yes. The SN74ALVCH16825DGGR supports V_CC from 1.65 V to 3.6 V, allowing direct interfacing between 1.8-V, 2.5-V, and 3.3-V logic domains. Its input thresholds scale with V_CC (e.g., VIH = 0.65×V_CC at 1.65 V), ensuring reliable recognition of signals from lower- or higher-voltage drivers without level shifters.

What is the thermal performance of the SN74ALVCH16825DGGR in its DGG package?

The SN74ALVCH16825DGGR in the TSSOP-56 (DGG) package has a junction-to-ambient thermal resistance (θ_JA) of 81°C/W. At maximum rated power dissipation (40 µA ICC + dynamic load), junction temperature rise remains within safe limits up to +85°C ambient, provided standard PCB copper pour and airflow are maintained per JEDEC standards.