Texas Instruments SN74ALVCH162827GR

Overview

SN74ALVCH162827GR 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 (OE1/OE2), integrated bus-hold circuitry on all data inputs, and on-die 26-Ω series output resistors-enabling clean signal integrity in high-speed board-level bus applications such as memory address/data buffering in industrial control backplanes.

For engineers reviewing the SN74ALVCH162827GR datasheet, SN74ALVCH162827GR pinout, SN74ALVCH162827GR application, or SN74ALVCH162827GR equivalent, key selection criteria include its dual-section 3-state control logic, bus-hold input stabilization (eliminating external pull resistors), 12-mA sink capability, ±250-mA latch-up immunity, and TSSOP-56 (DGG) package compatibility with space-constrained PCB layouts.

Technical Context

This device implements a dual 10-bit noninverting buffer architecture with independent 3-state enable control per section: both OE1 and OE2 must be low to activate Y outputs; either high forces high-impedance state. The bus-hold circuitry maintains valid logic levels on undriven A inputs without external components, while internal 26-Ω series resistors suppress overshoot/undershoot during fast edge transitions.

Electrical behavior is specified across −40°C to +85°C, with VIH/VIL thresholds scaling with V_CC (e.g., VIH = 0.65×V_CC at 1.65 V), VOL ≤ 0.8 V at I_OL = 12 mA (V_CC = 3 V), and VOH ≥ 2.0 V at I_OH = −12 mA (V_CC = 3 V). Propagation delay t_pd is 3.8 ns typical at V_CC = 2.7 V, and enable/disable times (t_en/t_dis) are ≤ 6.3 ns.

Key Specifications

Pinout & Package

TSSOP-56 (DGG) package: 13.9 mm × 4.4 mm × 1.2 mm max height, 0.5-mm pitch, lead-free NiPdAu finish, MSL Level-1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVCH162827DL and SN74ALVCH162827VR, the SN74ALVCH162827GR delivers identical logic functionality and electrical performance in a TSSOP package optimized for automated SMT placement density-making it ideal for compact industrial controllers where board area is constrained but thermal and signal integrity requirements remain unchanged.

Availability

SN74ALVCH162827GR is available at Aetrix Electronics and suitable for industrial PLC backplane buffering, FPGA I/O voltage translation, memory interface expansion, test equipment signal conditioning, and high-reliability embedded control requiring stable component supply across extended temperature ranges.

Supply support for SN74ALVCH162827GR 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 SN74ALVCH162827GR belongs to TI's Widebus™ family of advanced CMOS logic devices, engineered specifically for high-speed, low-noise bus interface applications in industrial automation, communications infrastructure, and test instrumentation.

FAQ

What is the recommended power-up sequence for SN74ALVCH162827GR to ensure outputs remain in high-impedance state?

To guarantee high-impedance during power-up, tie all OE inputs (1OE1, 1OE2, 2OE1, 2OE2) to V_CC via a pullup resistor. TI specifies minimum resistor value based on driver current-sinking capability; for SN74ALVCH162827GR, a 10-kΩ resistor suffices. This prevents unintended output activation before system initialization completes.

Does SN74ALVCH162827GR support hot-swap operation, and how does bus-hold assist?

Yes, SN74ALVCH162827GR supports hot-swap due to its bus-hold circuitry, which actively maintains valid logic states on undriven inputs during insertion/removal. For SN74ALVCH162827GR, this eliminates floating inputs that could cause metastability or excessive current draw, enhancing system robustness in modular backplane designs.

Can SN74ALVCH162827GR drive 50-Ω transmission lines directly without external termination?

Yes. SN74ALVCH162827GR integrates 26-Ω series output resistors, enabling direct drive of 50-Ω lines with minimal reflection. When paired with a 50-Ω load, the effective source impedance is ~76 Ω, providing acceptable damping for short-to-medium trace lengths-verified in TI's application notes for SN74ALVCH162827GR.

What is the maximum clock/data rate supported by SN74ALVCH162827GR in practical PCB layouts?

Based on t_pd = 3.8 ns (typ) and t_sk ≤ 0.5 ns, SN74ALVCH162827GR supports reliable operation up to 150 MHz for point-to-point routing and ~80 MHz for stubbed bus topologies. Signal integrity depends on layout: keep traces short, use ground planes, and avoid vias near SN74ALVCH162827GR outputs.

How does the dual-OE architecture of SN74ALVCH162827GR improve timing control compared to single-OE buffers?

The dual-OE per section (1OE1/1OE2, 2OE1/2OE2) in SN74ALVCH162827GR requires both enables to be low for output activation-enabling hierarchical gating. This allows precise timing windows (e.g., using one OE for chip select, another for write strobe), reducing glitches and improving setup/hold margins in synchronous bus designs using SN74ALVCH162827GR.