Texas Instruments SN74ALVCH16827DGGR

Overview

SN74ALVCH16827DGGR from Texas Instruments is a 20-bit noninverting buffer/driver with dual 10-bit sections, 3-state outputs, bus-hold inputs, and 1.65-V to 3.6-V V_CC operation. It supports industrial temperature range (–40°C to 85°C), features ±24-mA output drive at 3 V, and uses EPIC™ submicron CMOS process for enhanced performance.

For engineers reviewing the SN74ALVCH16827DGGR datasheet, SN74ALVCH16827DGGR pinout, SN74ALVCH16827DGGR application, or SN74ALVCH16827DGGR equivalent, key selection criteria include dual independent output-enable control per 10-bit section, bus-hold functionality eliminating external resistors, low input/output capacitance (6 pF / 7.5 pF), and TSSOP-56 package compatibility with high-density PCB layouts.

Technical Context

The SN74ALVCH16827DGGR implements two independent 10-bit buffer sections, each requiring both OE inputs (e.g., 1OE1 and 1OE2) to be low for Y outputs to drive; either high disables all ten outputs into high-impedance state. This dual-OE architecture enables fine-grained bus control without shared enable propagation delay.

Bus-hold circuitry actively maintains valid logic levels on unused or floating data inputs, eliminating need for external pullup/pulldown resistors. The device uses TI's EPIC™ submicron CMOS process, delivering latch-up immunity >250 mA (JESD 17) and ESD protection >2000 V (MIL-STD-883, Method 3015).

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16244ADGGR and SN74AVC16835DGGR, the SN74ALVCH16827DGGR uniquely combines dual independent OE control per 10-bit section, integrated bus-hold, and verified 1.65-V operation - making it optimal for industrial bus isolation and legacy interface modernization where pin compatibility and input stability are critical.

Availability

SN74ALVCH16827DGGR is available at Aetrix Electronics and suitable for industrial automation, test equipment, and FPGA I/O expansion requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for SN74ALVCH16827DGGR 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 SN74ALVCH16827DGGR belongs to TI's Widebus™ family of high-speed, low-voltage logic devices engineered for robust bus interfacing in industrial control, instrumentation, and programmable logic systems.

FAQ

What is the recommended power-up sequence for SN74ALVCH16827DGGR to ensure outputs remain in high-impedance state?

To guarantee high-impedance outputs during power-up, tie all OE inputs (1OE1, 1OE2, 2OE1, 2OE2) to V_CC via pullup resistors. TI specifies minimum resistor value based on driver sink capability; for SN74ALVCH16827DGGR, a 10-kΩ resistor suffices given its <5-µA input leakage. This prevents unintended bus contention before system firmware initializes OE control.

Does SN74ALVCH16827DGGR support mixed-voltage operation where inputs are driven at 3.3 V while V_CC = 1.8 V?

No. SN74ALVCH16827DGGR does not support overvoltage-tolerant inputs. Its absolute maximum input voltage is V_CC + 0.5 V, so with V_CC = 1.8 V, VI must stay ≤2.3 V. Driving 3.3-V signals directly risks damage. Use level-shifting circuitry or select a device with I/O-tolerant inputs if interfacing with higher-voltage sources.

How does the bus-hold feature in SN74ALVCH16827DGGR affect power consumption during idle periods?

Bus-hold circuitry draws ±75 µA per input at 3 V (per datasheet Section 6), increasing total quiescent current proportionally to number of floating inputs. For SN74ALVCH16827DGGR with all 20 inputs floating, additional ∼1.5 mA is drawn beyond base ICC (40 µA). This is intentional design trade-off: active holding prevents erratic behavior at negligible cost in most industrial applications.

Can SN74ALVCH16827DGGR replace SN74ALVCH162244DGGR in existing designs?

No - SN74ALVCH162244DGGR is a 16-bit device with different pinout, OE architecture (single OE per 4-bit group), and no bus-hold. SN74ALVCH16827DGGR has 20 pins, dual-OE per 10-bit section, and integrated bus-hold. Direct replacement would require PCB redesign. Use SN74ALVCH16827DGGR only in new designs targeting its specific 20-bit dual-section functionality.

What thermal derating applies to SN74ALVCH16827DGGR in a 4-layer PCB with standard copper pour?

With θ_JA = 81°C/W (TSSOP-DGG), SN74ALVCH16827DGGR dissipates ≤15 mW typical (C_pd = 16 pF @ 10 MHz). At worst-case 40-mA output switching, power remains under 100 mW. On a 4-layer board with 1-oz copper and thermal vias near V_CC/GND pins, junction temperature rise stays <8°C - well within –40°C to 85°C rating. No derating needed below 70°C ambient.