Nexperia USA Inc. 74ALVCH16601DGGS

Overview

74ALVCH16601DGGS from Nexperia is an 18-bit universal bus transceiver with bidirectional data flow control, bus hold inputs, and 3-state outputs. It supports A↔B data transfer via independent clock (CPAB/CPBA), latch enable (LEAB/LEBA), clock enable (CEAB/CEBA), and output enable (OEAB/OEBA) logic. Operates from 1.65 V to 3.6 V supply, delivers ±24 mA drive at 3.0 V, and is rated for −40 °C to +85 °C - used in high-density memory interface and backplane bus isolation applications.

For engineers reviewing the 74ALVCH16601DGGS datasheet, 74ALVCH16601DGGS pinout, 74ALVCH16601DGGS application, or 74ALVCH16601DGGS equivalent, this page provides verified functional behavior, TSSOP56 package mapping, timing-critical setup/hold values, IOFF-enabled partial power-down support, and direct TTL-level interfacing capability without level-shifting.

Technical Context

The device implements dual-path 18-bit synchronous/unlatched data routing: A-to-B path uses CPAB, LEAB, CEAB, and OEAB; B-to-A path uses CPBA, LEBA, CEBA, and OEBA. Each direction supports transparent mode (LE HIGH), latched mode (LE LOW + static CP), and edge-triggered storage (LE LOW + CE LOW + CP rising edge).

Bus hold circuitry maintains valid logic states on all 36 I/O pins (A0–A17, B0–B17) during floating conditions, eliminating external pull resistors. IOFF protection disables outputs during power-down, blocking reverse current flow between powered and unpowered buses - critical for hot-swap and mixed-voltage system designs.

Key Specifications

Pinout & Package

TSSOP56 package (SOT364-1), 56-pin plastic thin shrink small outline, 6.1 mm body width, 0.5 mm pitch, 1.2 mm max height - optimized for high-density PCB layouts with low inductance via multiple VCC/GND pins (4× VCC, 8× GND).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVTH16601DGGR, the 74ALVCH16601DGGS trades higher drive for integrated bus hold and IOFF - reducing external component count and enabling safer partial-power-down operation. Against 74LVC166245ADGG, it adds two data lanes, bus hold, and IOFF at minimal cost premium - making it superior for industrial backplane and memory isolation use cases.

Availability

74ALVCH16601DGGS is available at Aetrix Electronics and suitable for memory subsystem isolation, backplane bus arbitration, FPGA I/O expansion, and hot-swappable module interface applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for 74ALVCH16601DGGS 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 Dutch semiconductor manufacturer specializing in high-performance logic, analog, and MOSFET solutions for industrial, automotive, and computing markets.

The 74ALVCH series targets high-speed, low-voltage bus interface applications with emphasis on noise immunity, power efficiency, and robustness in mixed-supply systems - designed specifically for dense PCB layouts and thermally constrained environments.

FAQ

What is the maximum clock frequency supported by the 74ALVCH16601DGGS?

The device supports up to 340 MHz maximum clock frequency (fmax) at VCC = 3.3 V, as specified in Table 7 of the datasheet. This applies to CPAB/CPBA inputs when CEAB/CEBA = LOW and LEAB/LEBA = LOW, enabling high-speed edge-triggered data capture in synchronous bus architectures.

Does the 74ALVCH16601DGGS require external pull-up or pull-down resistors?

No. All 36 I/O pins (A0–A17, B0–B17) feature integrated bus hold circuitry, which actively maintains the last-valid logic state when inputs float. This eliminates the need for external biasing resistors in most applications, reducing BOM cost and PCB area.

Can the 74ALVCH16601DGGS operate with mixed supply voltages on A and B sides?

No. The device has a single VCC pin (4 locations, internally tied) and does not support true dual-supply operation. Both A-side and B-side I/Os share the same VCC domain and must operate within 1.65 V to 3.6 V - level translation requires external circuitry or companion devices.

How does IOFF protection function during system power sequencing?

When VCC drops below ~0.8 V, the IOFF circuitry automatically disables all outputs, forcing them into high-impedance state regardless of OEAB/OEBA logic levels. This prevents reverse current flow from powered B-side buses into unpowered A-side circuitry - critical for controlled power-down sequences in multi-rail systems.