NXP Semiconductors 74ALVCH16500DGG112

Overview

74ALVCH16500DGG112 from Nexperia is an 18-bit universal bus transceiver with bus hold inputs, 3-state outputs, and dual-directional latch/clock control (A↔B). It operates from 1.65 V to 3.6 V, supports -40 °C to +85 °C industrial temperature range, and features IOFF partial power-down protection. It is used in high-density data bus interfacing between asynchronous logic domains in telecom backplanes and industrial controllers.

For engineers reviewing the 74ALVCH16500DGG112 datasheet, 74ALVCH16500DGG112 pinout, 74ALVCH16500DGG112 application, or 74ALVCH16500DGG112 equivalent, key selection criteria include bidirectional latch timing (LEAB/LEBA), complementary output enables (OEAB active-HIGH, OEBA active-LOW), bus hold current specs (±75 μA at 3.0 V), and TSSOP56 package compatibility with 0.5 mm pitch PCB layouts.

Technical Context

This device implements a true universal transceiver architecture with independent A-to-B and B-to-A data paths, each controlled by dedicated latch enable (LEAB/LEBA), clock (CPAB/CPBA), and output enable (OEAB/OEBA) signals. Its MULTIBYTE™ flow-through pinout minimizes trace skew across all 18 channels.

The IOFF circuit disables outputs during power-down to prevent backflow current, while bus hold inputs eliminate external pull resistors on unused data lines. Propagation delays are specified down to 2.5 ns (OEAB→Bn, VCC = 3.3 V), supporting >300 MHz operation in high-speed synchronous bus applications.

Key Specifications

Pinout & Package

TSSOP56 package (SOT364-1), 56-pin plastic thin shrink small outline, 6.1 mm body width, 0.5 mm lead pitch, 1.2 mm max height.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar universal bus transceiver applications.

Compared with SN74ALVCH16500DGGR and 74LVC16500ADGG, the 74ALVCH16500DGG112 uniquely combines IOFF, bus hold, and full 1.65–3.6 V operation in a single TSSOP56 package-enabling robust hot-swap capability and eliminating external passive components in mixed-voltage industrial systems.

Availability

74ALVCH16500DGG112 is available at Aetrix Electronics and suitable for telecom backplane interfacing, industrial PLC I/O expansion, and medical imaging subsystem linking requiring stable component supply across extended temperature and mixed-voltage environments.

Supply support for 74ALVCH16500DGG112 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

Nexperia is a leading semiconductor manufacturer specializing in high-performance logic, analog, and discrete components for industrial, automotive, and computing applications.

The 74ALVCH16500 belongs to Nexperia's advanced ALVCH logic family, designed specifically for high-speed, low-power, mixed-voltage bus interfacing in space-constrained industrial and telecom equipment.

FAQ

What is the function of the complementary OEAB and OEBA pins on the 74ALVCH16500DGG112?

The 74ALVCH16500DGG112 uses OEAB (active-HIGH) to enable A-to-B data flow and OEBA (active-LOW) to enable B-to-A flow. This complementary polarity allows independent, glitch-free direction control without external inverters. When OEAB is HIGH and OEBA is HIGH, both outputs are high-impedance; only one direction is enabled at a time, preventing bus contention. This design is confirmed in Table 3 (Function Selection) and Section 1 of the datasheet.

Does the 74ALVCH16500DGG112 support partial power-down, and how does it work?

Yes, the 74ALVCH16500DGG112 includes IOFF circuitry that automatically disables all outputs when VCC is removed or drops below operational threshold. This prevents damaging backflow current from live buses into the unpowered device. The feature is explicitly documented in Section 1 (General description) and Table 4 (Limiting values), and is compliant with JEDEC JESD78 Class II Level B latch-up performance.

What is the purpose of bus hold on the 74ALVCH16500DGG112, and what current does it provide?

The bus hold feature on the 74ALVCH16500DGG112 maintains valid logic states on all 36 data inputs (A0–A17, B0–B17) when un-driven, eliminating need for external pull resistors. At VCC = 3.0 V, it sources +75 μA when input is LOW and sinks −75 μA when input is HIGH (Table 6, IBHL/IBHH). This is measured per pin and ensures noise-immune idle-state stability.

What are the maximum operating frequency and propagation delay specifications for the 74ALVCH16500DGG112?

The 74ALVCH16500DGG112 achieves up to 340 MHz maximum clock frequency (fmax) at VCC = 3.3 V (Table 7). Its fastest propagation delay is 2.5 ns (OEAB→Bn, VCC = 3.3 V), and its minimum pulse width (tw) is 1.1 ns under same conditions. These values are measured per channel and validated across the full −40 °C to +85 °C temperature range.

Which package type and footprint does the 74ALVCH16500DGG112 use, and what are its mechanical dimensions?

The 74ALVCH16500DGG112 uses the TSSOP56 package (SOT364-1): 56-lead, 6.1 mm body width, 0.5 mm lead pitch, and 1.2 mm max height (Fig. 10, Package outline). Pin 1 index is marked by a dot; the package has 10 GND and 4 VCC pins distributed for low-noise operation. This is confirmed in Table 1 (Ordering information) and Section 11.