Texas Instruments SN74LVC16374ADLG4

Overview

SN74LVC16374ADLG4 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 VCC operation. It functions as two independent 8-bit registers or one unified 16-bit latch, supports 5.5-V-tolerant inputs, delivers ±24 mA output drive at 3.3 V, and operates up to 150 MHz - used in server I/O buffering, PC memory interface control, and network switch data synchronization.

For engineers reviewing the SN74LVC16374ADLG4 datasheet, SN74LVC16374ADLG4 pinout, SN74LVC16374ADLG4 application, or SN74LVC16374ADLG4 equivalent, key selection criteria include its dual 8-bit output-enable architecture, Ioff partial-power-down capability, 3.3-V/5-V mixed-signal translation support, and SSOP-48 package compatibility with high-density PCB layouts.

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. Internal logic retains state during output disable, enabling seamless data staging without bus contention.

It features Ioff circuitry that disables outputs and blocks backflow current when VCC = 0 V, supporting live insertion and hot-swap systems. Input tolerance up to 5.5 V allows direct interfacing with 5-V logic while powered from 3.3 V or lower, eliminating level-shifters in mixed-voltage domains.

Key Specifications

Pinout & Package

SN74LVC16374ADLG4 is packaged in SSOP-48 (DL package), body size 15.80 mm × 7.50 mm, with 0.635-mm lead pitch and gull-wing leads suitable for automated SMT assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16374ADLG4, the DGGR and DGVR alternatives offer identical logic functionality and timing but differ in mechanical form factor - DL provides lowest thermal resistance for high-power-density server boards, while DGVR enables maximum miniaturization in portable equipment.

Availability

SN74LVC16374ADLG4 is available at Aetrix Electronics and suitable for server memory buffering, PC chipset I/O expansion, and network switch data path applications requiring stable component supply, long-term lifecycle assurance, and consistent SSOP-48 packaging.

Supply support for SN74LVC16374ADLG4 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 delivering analog and embedded processing solutions, with over 90 years of innovation in logic, power management, and signal chain technologies.

SN74LVC16374ADLG4 belongs to the Widebus™ family of high-speed, low-voltage CMOS logic devices engineered for robust bus interface, data latching, and mixed-voltage system bridging in computing and communications infrastructure.

FAQ

What is the maximum clock frequency supported by SN74LVC16374ADLG4?

The SN74LVC16374ADLG4 supports a maximum clock frequency of 150 MHz across its full operating voltage range (1.65 V to 3.6 V). This rating is validated under recommended conditions including VCC = 3.3 V ± 0.3 V, TA = –40°C to 125°C, and CL = 50 pF. Timing parameters such as tsu (1.9 ns) and th (1.1 ns) ensure reliable operation at this rate in synchronous bus designs.

Does SN74LVC16374ADLG4 support 5-V input signals while powered at 3.3 V?

Yes, SN74LVC16374ADLG4 supports input voltages up to 5.5 V regardless of VCC level - confirmed in the Absolute Maximum Ratings and Functional Description sections. This allows direct interfacing with 5-V logic families (e.g., TTL or older microcontrollers) while operating from a 3.3-V supply, eliminating external level shifters in mixed-voltage systems.

How does the Ioff feature function in SN74LVC16374ADLG4?

The Ioff feature in SN74LVC16374ADLG4 disables all outputs and blocks current flow when VCC = 0 V, preventing back-driving of powered circuitry during hot-swap or partial-power-down events. This is implemented via internal circuitry that isolates I/O terminals, satisfying JESD78 latch-up immunity (>250 mA) and enabling safe live insertion in modular systems.

What are the thermal characteristics of SN74LVC16374ADLG4 in SSOP-48 package?

SN74LVC16374ADLG4 in SSOP-48 (DL package) has a junction-to-ambient thermal resistance (RθJA) of 68.4°C/W, junction-to-board (RθJB) of 41.0°C/W, and junction-to-case (top) of 34.7°C/W. These values assume JEDEC-standard PCB mounting with two internal copper layers and are critical for thermal design in high-density server or networking applications where ambient temperatures reach 85°C.

Can SN74LVC16374ADLG4 be used as two independent 8-bit registers?

Yes, SN74LVC16374ADLG4 is explicitly architected for dual 8-bit operation: Bank 1 (1D1–1D8, 1Q1–1Q8, 1CLK, 1OE) and Bank 2 (2D1–2D8, 2Q1–2Q8, 2CLK, 2OE) operate independently. The datasheet confirms this in the Functional Block Diagram, Pin Functions table, and Applications section - enabling separate clocking and output control for distinct data channels.