Texas Instruments SN74ALVCH162827DL

Overview

SN74ALVCH162827DL 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 (1A/1Y and 2A/2Y), dual output-enable inputs per section (1OE1/1OE2, 2OE1/2OE2), bus-hold circuitry on all data inputs, and integrated 26-Ω series output resistors - eliminating need for external termination. Used in high-density memory address/data bus interfacing and hot-swap I/O expansion.

For engineers reviewing the SN74ALVCH162827DL datasheet, SN74ALVCH162827DL pinout, SN74ALVCH162827DL application, or SN74ALVCH162827DL equivalent, key selection considerations include its dual-section 3-state control logic, bus-hold input stabilization, 12-mA sink capability, SSOP-56 package footprint, and compatibility with mixed-voltage 1.8-V/2.5-V/3.3-V systems.

Technical Context

This device implements a dual 10-bit noninverting buffer architecture with independent 3-state enable control per section: both OE inputs (e.g., 1OE1 and 1OE2) must be low to activate corresponding Y outputs; either high forces high-impedance state. Bus-hold circuitry maintains valid logic levels on undriven A inputs without external resistors.

Output drivers integrate 26-Ω series resistance to suppress overshoot/undershoot, support ±12 mA drive strength, and meet JESD 17 latch-up (>250 mA) and JESD 22 ESD specifications (2000-V HBM, 200-V MM, 1000-V CDM). Designed for stable operation across -40°C to 85°C with supply voltage as low as 1.65 V.

Key Specifications

Pinout & Package

SN74ALVCH162827DL is housed in a 56-pin SSOP (Shrink Small-Outline Package), DL suffix, with 0.5-mm lead pitch, 11.4 mm × 4.5 mm body size, and 1.2 mm max height. JEDEC MO-194 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16244ADGGR and SN74AVC16T245DGGR, the SN74ALVCH162827DL uniquely combines bus-hold, integrated 26-Ω termination, and sub-2-ns propagation delay in a single 1.65–3.6-V solution - making it optimal for noise-sensitive, high-density, mixed-voltage bus expansion where input stability and signal integrity are critical.

Availability

SN74ALVCH162827DL is available at Aetrix Electronics and suitable for memory interface expansion, hot-swap I/O modules, low-voltage industrial PLC I/O, multi-rail signal translation, and high-density bus buffering requiring stable component supply and long-term industrial lifecycle support.

Supply support for SN74ALVCH162827DL 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 innovation in high-reliability interface and bus technologies.

The SN74ALVCH162827DL belongs to TI's Widebus™ family of advanced CMOS logic devices, engineered specifically for high-speed, low-voltage, high-pin-count bus interfacing in industrial, communications, and computing infrastructure.

FAQ

What is the function of the dual OE inputs (e.g., 1OE1 and 1OE2) on the SN74ALVCH162827DL?

The SN74ALVCH162827DL requires both OE inputs per 10-bit section (1OE1 AND 1OE2 for section 1; 2OE1 AND 2OE2 for section 2) to be logic low for outputs to be active. If either OE is high, all corresponding Y outputs enter high-impedance state. This dual-control design prevents accidental partial enable and improves noise immunity during power sequencing - a key reliability feature of the SN74ALVCH162827DL.

Does the SN74ALVCH162827DL support 1.8-V operation, and what are the guaranteed performance limits at that voltage?

Yes, the SN74ALVCH162827DL is fully specified for 1.65-V to 3.6-V operation. At V_CC = 1.8 V, it guarantees t_pd ≤ 4.4 ns, I_OL ≥ 2 mA, VOL ≤ 0.45 V, and VIH ≥ 1.17 V (0.65 × 1.8 V). These parameters ensure reliable timing and noise margin in modern low-voltage FPGA and ASIC interfaces using the SN74ALVCH162827DL.

Can the bus-hold feature on the SN74ALVCH162827DL be disabled, and is it safe to use pullup resistors alongside it?

No - the bus-hold circuitry on the SN74ALVCH162827DL is internal and always active; it cannot be disabled. Using external pullup or pulldown resistors with the SN74ALVCH162827DL is not recommended, as they conflict with bus-hold operation and may increase power consumption or cause logic contention. The SN74ALVCH162827DL is designed to operate correctly with bus-hold alone.

What is the thermal performance of the SN74ALVCH162827DL in the SSOP-56 (DL) package?

The SN74ALVCH162827DL in the DL package has a junction-to-ambient thermal resistance (θ_JA) of 56°C/W under standard JEDEC conditions. With typical I_CC < 40 µA and low dynamic power (Cpd ≈ 16 pF), self-heating remains minimal - enabling reliable operation up to 85°C ambient without heatsinking. This thermal profile is validated in the official SN74ALVCH162827DL datasheet.

How does the integrated 26-Ω series resistor in the SN74ALVCH162827DL affect signal integrity compared to discrete termination?

The integrated 26-Ω resistor in the SN74ALVCH162827DL is placed at the die output, minimizing parasitic inductance vs. discrete SMT resistors. This placement effectively damps transmission line reflections and reduces overshoot/undershoot - especially critical for 20-bit parallel buses routed over >5 cm traces. Unlike discrete solutions, it eliminates placement variability and saves 20 component placements, directly improving yield and signal fidelity in the SN74ALVCH162827DL implementation.