Nexperia USA Inc. 74ALVCH16501DGGS

Overview

74ALVCH16501DGGS from Nexperia is an 18-bit universal bus transceiver with dual-directional data flow control, bus hold inputs, and 3-state non-inverting outputs. It supports transparent, latched, and clocked operation modes across 1.2 V to 3.6 V supply range, delivers ±24 mA drive at 3.0 V, and operates from –40 °C to +85 °C. Used in high-density memory expansion and multi-processor interconnects where bidirectional signal integrity and power-down safety are critical.

For engineers reviewing the 74ALVCH16501DGGS datasheet, 74ALVCH16501DGGS pinout, 74ALVCH16501DGGS application, or 74ALVCH16501DGGS equivalent, this page provides verified functional behavior, TSSOP56 package mapping, IOFF-enabled partial power-down support, bus hold current specs, and real-world timing constraints for A-to-B/B-to-A data transfer under varying VCC and load conditions.

Technical Context

The device implements two independent 18-bit data paths (A↔B) with separate latch enable (LEAB/LEBA), clock (CPAB/CPBA), and output enable (OEAB active-HIGH / OEBA active-LOW) controls. Each path supports three operational modes: transparent (LE HIGH), latch-on-level (LE LOW + CP static), or edge-triggered (LE LOW + CP transition).

IOFF circuitry disables outputs during partial power-down, blocking backflow current when VCC = 0 V; bus hold circuitry maintains valid logic states on all 36 data pins without external pull-ups. Propagation delays range from 1.0 ns to 6.3 ns depending on VCC and signal path (e.g., An→Bn: 2.8 ns typ @ 3.0 V; OEAB→Bn: 2.4 ns typ @ 3.3 V).

Key Specifications

Pinout & Package

TSSOP56 (SOT364-1) package: plastic thin shrink small outline, 56 leads, 6.1 mm body width, 0.5 mm 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 SN74ALVCH16501DGGR, the DGGS offers identical performance in tube format for lab use; versus 74LVC16501ADGG, it adds IOFF protection and guaranteed bus hold across full 1.2–3.6 V range - critical for mixed-voltage industrial systems.

Availability

74ALVCH16501DGGS is available at Aetrix Electronics and suitable for memory expansion interfaces, FPGA-to-ASIC interconnects, and industrial PLC backplane buses requiring stable component supply across extended temperature ranges and mixed-voltage operation.

Supply support for 74ALVCH16501DGGS 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 global semiconductor expert focused on high-volume, high-reliability logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74ALVCH series targets advanced low-voltage bus interfacing, emphasizing wide VCC tolerance, IOFF safety, and bus hold functionality for next-generation embedded systems with dynamic power management.

FAQ

What is the minimum supply voltage for reliable operation of the 74ALVCH16501DGGS?

The device is fully specified down to 1.2 V per JEDEC JESD8-7, with guaranteed VIH/VIL thresholds, propagation delays, and output drive at that level. Below 1.2 V, parameters like VOL and tpd degrade beyond specification limits - operation below 1.2 V is not characterized or supported.

How does the IOFF feature behave when only VCC is powered down?

When VCC drops to 0 V while inputs remain driven, IOFF activates automatically: all outputs enter high-impedance state regardless of OE/LE/CP states, preventing reverse current flow from live inputs into the unpowered VCC rail - confirmed per datasheet Section 1, Figure 3, and limiting values Table 4.

Can both A-to-B and B-to-A data paths operate simultaneously?

No - the device supports bidirectional operation but not true simultaneous transfer. While OEAB and OEBA can be asserted concurrently, the internal architecture uses shared bus structures; concurrent A→B and B→A transfers cause bus contention unless strictly time-multiplexed using LE/CP sequencing per functional table (Section 6).

Is the bus hold function always enabled, or does it require configuration?

Bus hold is permanently enabled on all 36 data pins (A0–A17, B0–B17) - no external enable signal or register setting is needed. Its strength (IBHL/IBHH) varies with VCC and input voltage per Table 6, and it remains active in all operating modes including 3-state and power-down.