Texas Instruments SN74LVCH16374AZRDR

Overview

SN74LVCH16374AZRDR 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 dual 8-bit sections (1CLK/1OE and 2CLK/2OE), 5.5-V-tolerant inputs, 24-mA output drive at 3.3 V, and bus-hold on all data inputs-enabling robust data latching in server memory buffers and industrial I/O port expansion.

For engineers reviewing the SN74LVCH16374AZRDR datasheet, SN74LVCH16374AZRDR pinout, SN74LVCH16374AZRDR application, or SN74LVCH16374AZRDR equivalent, this device supports mixed-voltage translation (5-V input → 3.3-V logic), live insertion via Ioff, high-speed bus interfacing up to 150 MHz, and zero external pull-up requirements due to integrated bus-hold circuitry.

Technical Context

This device implements two independent 8-bit positive-edge-triggered D flip-flop banks, each with dedicated clock (1CLK/2CLK) and output-enable (1OE/2OE) controls. All 16 D inputs accept voltages up to 5.5 V regardless of VCC, enabling seamless level translation in mixed-supply systems.

Each Q output delivers ±24 mA drive capability at 3.3 V, supports high-impedance tri-state control, and exhibits 4.5 ns typical propagation delay (tpd) from CLK to Q. The Ioff feature disables outputs and blocks current backflow when VCC = 0 V, supporting partial-power-down and hot-swap applications.

Key Specifications

Pinout & Package

TSSOP-48 package (DGG), body size 12.50 mm × 6.10 mm, 0.5-mm pitch, lead-free (NiPdAu), moisture sensitivity level 1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVCH16374AZRDR, SN74LVC16374ADGGR omits bus-hold and Ioff-increasing layout complexity and limiting hot-swap use-while 74ALVCH16374TTR trades voltage flexibility and 5-V tolerance for marginal speed gain, restricting deployment in multi-rail systems.

Availability

SN74LVCH16374AZRDR is available at Aetrix Electronics and suitable for server memory buffering, industrial I/O expansion, network switch fabric interface, and wearable health data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVCH16374AZRDR 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 connectivity solutions, with decades of expertise in high-reliability logic and interface ICs.

The SN74LVCH16374AZRDR belongs to TI's Widebus™ family of advanced CMOS logic devices, engineered specifically for high-speed, mixed-voltage bus interfacing in servers, networking infrastructure, and industrial automation.

FAQ

What is the maximum clock frequency supported by the SN74LVCH16374AZRDR?

The SN74LVCH16374AZRDR supports a maximum clock frequency of 150 MHz across its full operating voltage range (1.65 V to 3.6 V). This is validated by timing specifications including t_w (minimum pulse width) of 3.3 ns and t_pd (CLK-to-Q propagation delay) of 4.5 ns at 3.3 V, ensuring reliable edge-triggered operation in high-speed data capture and buffering applications using the SN74LVCH16374AZRDR.

Does the SN74LVCH16374AZRDR require external pull-up or pull-down resistors on its data inputs?

No, the SN74LVCH16374AZRDR does not require external pull-up or pull-down resistors on its D inputs because it integrates active bus-hold circuitry. This feature maintains a valid logic state on unused or floating inputs, with hold current specified as ±45 μA at 2.3 V. Using external resistors with the SN74LVCH16374AZRDR is explicitly discouraged in the datasheet, as it may interfere with bus-hold functionality and increase power consumption.

Can the SN74LVCH16374AZRDR be used in a system with 5-V microcontrollers and a 3.3-V supply rail?

Yes, the SN74LVCH16374AZRDR is explicitly designed for mixed-voltage operation: its inputs tolerate voltages up to 5.5 V regardless of VCC, enabling direct connection to 5-V microcontrollers while powered from a 3.3-V supply. This makes the SN74LVCH16374AZRDR ideal for voltage translation in legacy-to-modern system upgrades, where level-shifting components would otherwise be needed.

What is the purpose of the Ioff feature in the SN74LVCH16374AZRDR, and how does it benefit system design?

The Ioff feature in the SN74LVCH16374AZRDR disables output drivers and blocks current backflow when VCC = 0 V, supporting safe live insertion and partial-power-down modes. This protects downstream circuitry during hot-swap events (e.g., memory module replacement) and simplifies power sequencing in multi-rail systems. With Ioff leakage limited to ±10 μA, the SN74LVCH16374AZRDR ensures system-level reliability without additional isolation circuitry.

How many power and ground pins does the SN74LVCH16374AZRDR have in its TSSOP-48 package, and why is this important?

The SN74LVCH16374AZRDR in TSSOP-48 has four VCC pins (7, 18, 31, 42) and eight GND pins (4, 10, 15, 21, 28, 34, 39, 45). This distributed power/ground architecture minimizes impedance in high-speed switching paths, reduces ground bounce (VOLP < 0.8 V at 3.3 V), improves noise immunity, and supports clean signal integrity across all 16 data channels-critical for reliable operation of the SN74LVCH16374AZRDR in dense, high-density PCB layouts.