NXP Semiconductors 74ALVCH162827DGG518

Overview

74ALVCH162827DGG518 from NXP Semiconductors (formerly Philips) is a 20-bit non-inverting CMOS buffer/line driver with integrated 30Ω series termination resistors and dual 3-state output enables (nOE1/nOE2), delivering ±12 mA drive at 3.0 V, 2.9 ns propagation delay at 3.3 V/50 pF, and operating across –40°C to +85°C in a 56-pin TSSOP package - used for high-speed memory address and clock bus driving.

For engineers reviewing the 74ALVCH162827DGG518 datasheet, 74ALVCH162827DGG518 pinout, 74ALVCH162827DGG518 application, or 74ALVCH162827DGG518 equivalent, key selection criteria include integrated 30Ω termination, MULTIBYTETM flow-through pinout, bus-hold inputs, low-noise multi-VCC/GND layout, and JEDEC 8-1A compliance for TTL-level interfacing in wide parallel buses.

Technical Context

This device implements two independent 10-bit buffered channels (1A/1Y and 2A/2Y), each controlled by separate active-low output enables (nOE1/nOE2), enabling flexible bus partitioning and staggered enable timing. Its internal 30Ω series resistors are embedded in both pull-up and pull-down paths - not external - reducing line ringing and ground bounce without requiring PCB-level termination components.

The 74ALVCH162827DGG518 integrates active bus-hold circuitry on all 20 inputs to maintain valid logic levels on floating or unused lines, eliminating need for external pull-ups/downs. It supports dual supply voltage ranges: 2.3–2.7 V (optimized for 30 pF loads) and 3.0–3.6 V (optimized for 50 pF loads), with guaranteed operation up to 85°C ambient.

Key Specifications

Pinout & Package

Package: 56-pin plastic thin shrink small outline package (TSSOP), body width 6.1 mm (SOT364-1), lead pitch 0.5 mm, surface-mount compatible.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVCH162827DGGR, the 74ALVCH162827DGG518 offers tighter propagation delay consistency and lower quiescent current; compared with 74LVC16244ADGG, it delivers true plug-and-play termination and bus-hold reliability - making it superior for noise-sensitive, high-density parallel bus designs.

Availability

74ALVCH162827DGG518 is available at Aetrix Electronics and suitable for memory subsystems, industrial I/O expansion, clock distribution networks, and legacy peripheral interfaces requiring stable component supply and long-term industrial temperature support.

Supply support for 74ALVCH162827DGG518 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

NXP Semiconductors, formerly Philips Semiconductors, is a global leader in high-performance analog and logic ICs, with core expertise in automotive, industrial, and communication semiconductor solutions.

The 74ALVCH162827DGG518 belongs to NXP's ALVCH advanced low-voltage CMOS logic family - engineered specifically for high-speed, low-noise parallel bus interfacing in memory, computing, and industrial control systems.

FAQ

What is the purpose of the integrated 30Ω resistors in the 74ALVCH162827DGG518?

The 74ALVCH162827DGG518 integrates 30Ω series resistors in both pull-up and pull-down output paths to provide source termination for transmission lines. This reduces signal reflections, overshoot, and ground bounce in high-speed parallel bus applications such as memory address drivers and clock distribution - eliminating the need for 20 discrete SMT resistors and simplifying PCB layout. The value is optimized for common FR-4 trace impedances near 60 Ω in series-terminated configurations.

Does the 74ALVCH162827DGG518 support both 2.5 V and 3.3 V operation?

Yes, the 74ALVCH162827DGG518 supports two distinct supply voltage ranges: 2.3–2.7 V (optimized for 30 pF loads) and 3.0–3.6 V (optimized for 50 pF loads). At 3.3 V, it achieves 2.9 ns typical propagation delay with ±12 mA drive capability. DC electrical characteristics including VIH/VIL thresholds and VOH/VOL levels are fully specified across both ranges, ensuring reliable interoperability with 2.5 V and 3.3 V logic families without level shifters.

How does the bus-hold feature work on the 74ALVCH162827DGG518 inputs?

The 74ALVCH162827DGG518 includes active bus-hold circuitry on all 20 input pins (1A0–1A9, 2A0–2A9), which senses the last valid logic state and applies a weak sustaining current (±45 µA at 2.3 V) to hold that level when the input is floating or un-driven. This prevents metastability and undefined logic states without requiring external pull-up or pull-down resistors - critical for robust operation in hot-plug or partially populated I/O expansion scenarios.

What is the recommended power-up sequence for the 74ALVCH162827DGG518 to avoid output contention?

To ensure outputs remain in high-impedance state during power-up, the 74ALVCH162827DGG518 requires OE inputs (1OE1, 1OE2, 2OE1, 2OE2) to be held HIGH before VCC reaches valid logic threshold. Philips recommends tying each OE pin to VCC via a pull-up resistor; minimum value depends on driver sink strength but typically ≥10 kΩ. This prevents unintended output activation and potential bus conflicts during supply ramp-up.

Is the 74ALVCH162827DGG518 pin-compatible with other members of the ALVCH family?

The 74ALVCH162827DGG518 uses the MULTIBYTETM flow-through pinout architecture standardized across NXP's ALVCH 16-bit and 20-bit buffers (e.g., 74ALVCH162244, 74ALVCH16244), but it is not pin-compatible with non-terminated variants due to differing internal termination and bus-hold implementation. Its 56-pin TSSOP (SOT364-1) footprint is unique to this 20-bit terminated function - verify pin mapping against official NXP documentation before substitution.