Texas Instruments SN74ALVCH16374KR

Overview

SN74ALVCH16374 from Texas Instruments is a 16-bit edge-triggered D-type flip-flop with 3-state outputs, designed for 1.65-V to 3.6-V operation. It features ±24-mA drive strength at 3.3 V, 4.2-ns max propagation delay, bus-hold on all data inputs, and dual independent 8-bit sections with separate clock and output-enable controls. It is used in high-speed bidirectional bus interfaces and I/O port buffering.

For engineers reviewing the SN74ALVCH16374 datasheet, SN74ALVCH16374 pinout, SN74ALVCH16374 application, or SN74ALVCH16374 equivalent, key selection criteria include voltage compatibility (1.65–3.6 V), 3-state output timing (enable/disable < 4.8 ns), bus-hold functionality eliminating external resistors, and VFBGA-48 (ZQL) package suitability for space-constrained PCB layouts.

Technical Context

This device implements two independent 8-bit positive-edge-triggered D flip-flops, each with dedicated clock (CLK) and output-enable (OE) inputs. Data is latched on the rising edge of CLK; OE controls high-impedance state independently per 8-bit group without affecting internal latch operation.

It integrates bus-hold circuitry on all 16 data inputs, maintaining valid logic states without external pullup/pulldown resistors. The design supports hot-insertion and meets JESD 17 latch-up immunity (>250 mA) and JESD 22 ESD ratings (2000-V HBM, 200-V MM).

Key Specifications

Pinout & Package

VFBGA-48 (ZQL) package: 6 × 5 mm body, 0.5-mm pitch, 48-ball array, JEDEC MO-153 compliant, 1.2-mm max height. Pin 1 located at top-left corner (Q1 quadrant), marked by fiducial dot.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit D-type flip-flop applications.

Compared with SN74ALVCH16374, SN74LVC16374ADGGR offers identical package and voltage range but omits bus-hold-increasing design risk in undriven scenarios-while 74AVC16374BQ,118 provides faster timing but demands layout revision and adds external biasing complexity.

Availability

SN74ALVCH16374 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, high-speed memory interfaces, automotive body control units, and automated test equipment requiring stable component supply and long-term manufacturability.

Supply support for SN74ALVCH16374 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 decades of expertise in high-reliability interface and timing products.

The SN74ALVCH16374 belongs to TI's Widebus™ family-designed specifically for low-voltage, high-speed parallel bus interfacing in industrial, communications, and computing systems where signal integrity and power efficiency are critical.

FAQ

What is the recommended power-up sequence for SN74ALVCH16374 to ensure outputs remain in high-impedance state?

To guarantee high-impedance outputs during power-up, tie both 1OE and 2OE to VCC via pullup resistors. TI specifies minimum resistor values based on driver sink capability; for standard use, 10-kΩ resistors suffice. This prevents unintended bus loading before the controlling MCU initializes its GPIOs. The SN74ALVCH16374 itself does not require a specific VCC ramp rate, but OE must be asserted high before VCC reaches 1.5 V to avoid metastability.

Does SN74ALVCH16374 support mixed-voltage operation between data inputs and VCC?

No-SN74ALVCH16374 does not support mixed-voltage I/O. All inputs (D, CLK, OE) must operate within the same VCC-supplied voltage domain (1.65–3.6 V). Input voltage limits are referenced to VCC (e.g., VIH ≥ 0.65×VCC), and violating this-such as applying 3.3-V signals to a 1.8-V-powered SN74ALVCH16374-may cause excessive current or damage. For level translation, external buffers or dual-supply translators are required.

How does the bus-hold feature behave when an input is actively driven versus floating?

When a D input is actively driven (e.g., by a microcontroller GPIO), the bus-hold circuit is overridden and has no effect-the input follows the applied logic level. When the input floats (e.g., disconnected or tri-stated), the bus-hold circuit engages automatically, latching the last valid state with ~100-µA holding current. TI explicitly warns against combining bus-hold with external pullup/pulldown resistors, as they conflict and may cause excessive current or undefined thresholds. This behavior is intrinsic to the SN74ALVCH16374 silicon and requires no configuration.

Can SN74ALVCH16374 be used as a single 16-bit register, or is dual 8-bit operation mandatory?

The SN74ALVCH16374 supports both configurations. Its architecture consists of two independent 8-bit sections (1Q1–1Q8 and 2Q1–2Q8), each with dedicated CLK and OE. To use as a single 16-bit register, tie 1CLK and 2CLK together, and tie 1OE and 2OE together. All 16 D inputs and Q outputs remain fully accessible. No internal limitation prevents this; timing parameters (e.g., tpd, tsu) apply per section and are identical, enabling coherent 16-bit operation when clocks and enables are synchronized.

What is the maximum clock frequency supported by SN74ALVCH16374 under industrial temperature conditions?

The SN74ALVCH16374 supports up to 150 MHz clock frequency across the full –40°C to +85°C operating range, as confirmed by timing specifications (fclock min = 150 MHz) and switching characteristics tables. This rating holds at VCC = 3.3 V; at lower voltages (e.g., 1.8 V), timing margins reduce slightly but still support >100 MHz operation. The 4.2-ns max tpd at 3.3 V directly enables this frequency, assuming proper PCB layout with controlled impedance and minimal skew between CLK and D traces.