Texas Instruments SN74ALVCH16825DLR

Overview

SN74ALVCH16825DLR from Texas Instruments is an 18-bit non-inverting 3-state buffer/driver with bus-hold circuitry, designed for 1.65-V to 3.6-V V_CC operation in memory address, clock, and bus-oriented systems. It supports dual 9-bit or single 18-bit configurations, features active-low 2-input AND-gated output-enable control (OE1/OE2), and operates across –40°C to 85°C.

For engineers reviewing the SN74ALVCH16825DLR datasheet, SN74ALVCH16825DLR pinout, SN74ALVCH16825DLR application, or SN74ALVCH16825DLR equivalent, key selection criteria include 3-state timing (t_pd = 3.4 ns at V_CC = 2.5 V), bus-hold input current (±45 µA at 2.3 V), and SSOP-56 package compatibility with high-density PCB layouts.

Technical Context

This device implements two independent 9-bit sections, each with separate output-enable inputs (OE1/OE2) controlling nine outputs via a 2-input AND gate with active-low logic - ensuring high-impedance state when either OE is high. Bus-hold circuitry maintains valid logic levels on unused inputs without external resistors.

The SN74ALVCH16825DLR uses TI's EPIC™ submicron CMOS process, delivering latch-up immunity >250 mA per JESD 17 and ESD protection >2000 V (MIL-STD-883) and >200 V (machine model). Its I/O structure supports mixed-voltage interfacing within the 1.65–3.6-V range while maintaining rail-to-rail output swing.

Key Specifications

Pinout & Package

SN74ALVCH16825DLR is packaged in a 56-pin Shrink Small-Outline Package (SSOP), DL variant, with 0.5-mm lead pitch, 13.9–14.1 mm body width, and 1.2-mm max height. Pin 1 is marked by a beveled corner and located at top-left when viewed from top with marking side up.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVCH16825DLR, SN74LVC16245ADGGR reduces BOM cost but increases layout complexity due to missing bus-hold, while SN74AVC16835DGGR improves speed and voltage flexibility at the expense of industrial temperature qualification and higher unit price.

Availability

SN74ALVCH16825DLR is available at Aetrix Electronics and suitable for memory subsystems, clock tree distribution, industrial backplane interfaces, and FPGA-to-processor interconnects requiring stable component supply and long-term industrial temperature support.

Supply support for SN74ALVCH16825DLR 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 90 years of innovation in industrial, automotive, and communications markets.

The SN74ALVCH16825DLR belongs to TI's Widebus™ family of high-density bus interface ICs, engineered specifically for low-voltage, high-speed memory addressing, clock buffering, and bus isolation in space-constrained industrial systems.

FAQ

What is the recommended power-up sequence for SN74ALVCH16825DLR to ensure reliable 3-state behavior?

TI recommends tying OE inputs to V_CC through a pullup resistor (minimum value determined by driver sink capability) during power-up and power-down. This guarantees all outputs remain in high-impedance until V_CC stabilizes and valid control signals are applied. For SN74ALVCH16825DLR, this prevents bus contention in systems where supply rails ramp at different rates, especially critical in multi-rail industrial controllers.

Does SN74ALVCH16825DLR support mixed-voltage operation between input and output sides?

SN74ALVCH16825DLR does not support true mixed-voltage I/O - all inputs and outputs reference the same V_CC rail (1.65–3.6 V). However, its wide V_CC range allows interoperability with 1.8-V, 2.5-V, and 3.3-V logic families when powered accordingly. Input thresholds scale with V_CC, and outputs swing rail-to-rail, making SN74ALVCH16825DLR suitable for level-shifting within that single supply domain.

How does the bus-hold feature in SN74ALVCH16825DLR affect power consumption during idle states?

The bus-hold circuitry in SN74ALVCH16825DLR draws ±45 µA per input at V_CC = 2.3 V when holding a logic state - significantly less than typical pull-up resistors (e.g., 10 kΩ to 3.3 V draws 330 µA). This reduces static power by >85% compared to discrete biasing, while eliminating solder joints and board area. Total bus-hold current for all 18 inputs remains under 1 mA at nominal V_CC, preserving low-power system budgets.

Can SN74ALVCH16825DLR be used in place of SN74ALVCH16825DL without design changes?

Yes - SN74ALVCH16825DLR and SN74ALVCH16825DL share identical SSOP-56 (DL) package dimensions, pinout, electrical specifications, and thermal characteristics. The "R" suffix denotes tape-and-reel packaging (2000 pcs/reel), whereas SN74ALVCH16825DL is supplied in tubes (20 pcs/tube). No PCB layout, schematic, or firmware modifications are required when substituting SN74ALVCH16825DLR for SN74ALVCH16825DL.

What is the maximum capacitive load SN74ALVCH16825DLR can drive while maintaining specified t_pd and output transition times?

TI characterizes SN74ALVCH16825DLR with CL = 50 pF for power dissipation (C_pd) and CL = 30 pF for switching parameters (t_pd, t_en, t_dis). While it can drive >100 pF loads, propagation delay increases linearly beyond 50 pF - e.g., t_pd degrades ~0.3 ns per 10 pF increase above 50 pF at V_CC = 2.5 V. For guaranteed timing compliance, keep total load ≤50 pF per output, including trace capacitance and receiver inputs.