Texas Instruments SN74ALVCH162827DLR

Overview

SN74ALVCH162827DLR 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), integrated bus-hold circuitry on all data inputs, and on-die 26-Ω series output resistors-enabling clean signal integrity in high-speed bus interface applications such as memory address/data buffering in industrial control backplanes.

For engineers reviewing the SN74ALVCH162827DLR datasheet, SN74ALVCH162827DLR pinout, SN74ALVCH162827DLR application, or SN74ALVCH162827DLR equivalent, key selection criteria include its dual-section 3-state control logic, bus-hold input stabilization (eliminating external pull resistors), 12-mA sink capability, 1.65–3.6-V supply flexibility, and SSOP-56 package compatibility with space-constrained PCB layouts.

Technical Context

The SN74ALVCH162827DLR implements a dual 10-bit noninverting buffer architecture where each Y-output group (1Y1–1Y10 and 2Y1–2Y10) activates only when both corresponding OE inputs are low (e.g., 1OE1 = L AND 1OE2 = L). Its bus-hold circuitry maintains valid logic states on undriven A-inputs without external resistors, and internal 26-Ω series output termination reduces overshoot/undershoot during fast edge transitions.

It operates across –40°C to +85°C with latch-up immunity >250 mA (JESD 17) and ESD protection exceeding 2000-V HBM, 200-V MM, and 1000-V CDM. Input thresholds scale with V_CC (e.g., VIH = 0.65×V_CC at 1.65 V), and output drive strength is specified up to ±12 mA at 3.0 V, supporting TTL- and CMOS-level interfacing in mixed-voltage systems.

Key Specifications

Pinout & Package

SN74ALVCH162827DLR is housed in a 56-pin SSOP (Shrink Small-Outline Package), DL variant, with 0.5-mm lead pitch, 11.4-mm body width, and 1.2-mm max height. The package is RoHS-compliant, moisture-sensitivity Level-1 rated, and optimized for automated surface-mount assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16244ADGGR, SN74ALVCH162827DLR provides superior noise immunity via bus-hold and finer output control via dual OE per section; compared with SN74ALVCH162244DLR, it avoids mandatory signal inversion - preserving timing alignment in synchronous bus architectures.

Availability

SN74ALVCH162827DLR is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory subsystem buffering, hot-swappable module interconnects, and low-power data multiplexing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74ALVCH162827DLR 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 interface ICs for industrial and automotive markets.

The SN74ALVCH162827DLR belongs to TI's Widebus™ family of advanced CMOS logic devices, engineered specifically for high-speed, low-voltage parallel bus applications demanding robust signal integrity, bus stability, and mixed-supply interoperability.

FAQ

What is the recommended power-up sequence for SN74ALVCH162827DLR to ensure reliable 3-state behavior?

TI recommends tying OE inputs to V_CC through a pullup resistor during power-up to guarantee high-impedance outputs until system initialization completes. For SN74ALVCH162827DLR, the minimum pullup value is determined by the driver's current-sinking capability - typically ≥10 kΩ suffices given its low I_I (±5 µA). This prevents bus contention before firmware configures OE states.

Does SN74ALVCH162827DLR support mixed-voltage operation between input and output sides?

No - SN74ALVCH162827DLR is a single-supply device: all inputs and outputs reference the same V_CC rail (1.65–3.6 V). It does not provide level-shifting functionality. However, its scalable VIH/VIL thresholds (e.g., VIH = 0.65×V_CC) allow reliable interfacing with both 1.8-V and 3.3-V drivers when V_CC is set appropriately - making SN74ALVCH162827DLR ideal for uniform-voltage domain expansion.

Can SN74ALVCH162827DLR replace older 74-series buffers like 74ACT16244 in existing designs?

SN74ALVCH162827DLR offers functional equivalence to 74ACT16244 in buffering capacity but differs critically: it adds bus-hold, integrated 26-Ω termination, lower V_CC minimum (1.65 V vs. 4.5 V), and dual-OE per 10-bit section. Direct replacement requires verifying SSOP-56 footprint compatibility and updating OE control logic - SN74ALVCH162827DLR is not pin-compatible with 48-pin ACT packages.

How does the bus-hold circuitry in SN74ALVCH162827DLR affect input leakage current specifications?

The bus-hold circuitry in SN74ALVCH162827DLR introduces a controlled input hold current (I_I(hold)) ranging from ±25 µA to ±75 µA depending on V_CC and input voltage - distinct from standard input leakage (±5 µA). This intentional current actively biases floating inputs to valid logic levels, so designers must account for it in high-impedance sensor interfaces where it could perturb weak signals - SN74ALVCH162827DLR's bus-hold is disabled only by external pull resistors.

What thermal derating guidance applies to SN74ALVCH162827DLR in high-density PCB layouts?

SN74ALVCH162827DLR has a θ_JA of 56°C/W in the SSOP-DL package. At full 20-bit switching with 12-mA loads, power dissipation may reach ~120 mW - resulting in ~6.7°C junction rise above ambient. To maintain <125°C T_J in 85°C ambient, ensure ≥1 cm² copper pour under the package and avoid stacking heat-generating components nearby. TI's thermal guidelines for DL package apply directly to SN74ALVCH162827DLR.