Texas Instruments SN74LVC16374ADGGR

Introduction to SN74LVC16374ADGGR

The SN74LVC16374ADGGR, developed by Texas Instruments, is a highly versatile 16-bit edge-triggered D-type flip-flop featuring 3-state outputs and designed for operation over a wide voltage range from 1.65V to 3.6V. As a member of TI’s Widebus™ family, this device is tailored for use in high-integration environments such as servers, computers, network switches, and point-of-sale terminals where buffered storage and controlled data transfer on wide data buses are essential.

Packaged in a space-efficient 48-pin TSSOP (Thin Shrink Small Outline Package), the SN74LVC16374ADGGR combines dense functionality with easy PCB integration, making it suitable for complex board-level designs that demand both high performance and reliable bus arbitration.

Main Attributes of SN74LVC16374ADGGR

The SN74LVC16374ADGGR stands out due to a host of advanced features that safeguard bus communications in modern digital systems:

16-bit edge-triggered D-type flip-flop, configurable as two independent 8-bit registers or a single 16-bit device.

Wide VCC operating range (1.65V to 3.6V) supporting deep integration in both lowand standard-voltage systems.

Inputs tolerate voltages up to 5.5V, enabling direct interfacing with 5V logic in mixed-supply environments.

Output enable ($\overline{OE}$) pin provides 3-state outputs to facilitate bidirectional bus architectures or high-impedance bus isolation.

$I_{off}$ protection ensures safe operation during live insertion or partial power-down, preventing destructive current backflow when VCC is zero.

High output drive: 24mA at 3.3V, permitting connection of multiple load points or rapid signal transitions for high-speed bus interfaces up to 150MHz.

ESD protection exceeding 2kV HBM and 1kV CDM, as well as latch-up immunity per JESD 17.

RoHS3 compliant and MSL 1 rating, supporting broad environmental compatibility and robust reflow assembly.

SN74LVC16374ADGGR Pinout and Package Variations

The SN74LVC16374ADGGR is provided in the 48-pin TSSOP package (DGG), which offers a compact footprint and good thermal characteristics. All device functions, including clock inputs, data inputs, output enables, and ground/power connections, are organized for straightforward PCB routing. Alternate packages in the SN74LVC16374A family also support high-density board designs and automated manufacturing.

Pin assignments strictly follow industry standards, ensuring compatibility and ease of use in multi-sourced layouts. It is essential that all unused inputs are tied to either VCC or ground to avoid indeterminate logic states and ensure predictable device operation.

SN74LVC16374ADGGR Electrical and Thermal Specifications

Designers can rely on the robust electrical performance of the SN74LVC16374ADGGR across its operating temperature and voltage ranges:

Absolute Maximum Ratings include supply voltages up to 4.6V and input/output voltages up to 6.5V (non-operating).

Recommended operating VCC is 1.65V – 3.6V, with a maximum operating temperature of 125°C.

Input logic thresholds are specified for interfacing with both CMOS and TTL-level signals.

Outputs safely handle up to 24mA source/sink at VCC = 3.3V, with low-voltage output and fast-switching characteristics.

Devices feature low standby current and minimal propagation delays, suited for high-speed and low-power designs.

Good thermal dissipation characteristics, aided by appropriate PCB layout and bypassing.

Operating Principles and Use Cases for SN74LVC16374ADGGR

At its core, the SN74LVC16374ADGGR functions as a dual 8-bit or single 16-bit edge-triggered register. On each positive clock transition, data at the D inputs is latched to the Q outputs, provided the output enable ($\overline{OE}$) is active. The independent 3-state capability allows outputs to be isolated from the bus without affecting internal flip-flop contents—critical in multi-master or shared-bus systems.

The device fits naturally in use cases requiring temporary storage and controlled data transfer, such as:

Buffer registers for high-speed microprocessor and DSP data buses.

I/O port expansion and signal multiplexing in computers or embedded devices.

Bidirectional bus driving—enabling selective direction or isolation of data flows.

Level translation between 5V output and 3.3V input devices, as part of mixed-voltage system designs.

Design Recommendations for Integrating SN74LVC16374ADGGR

For optimal results, the following engineering guidelines are fundamental:

Ensure all unused logic inputs are tied to a defined voltage level (VCC or GND) based on desired default states.

Avoid exceeding maximum recommended input transition rates ($\Delta t/\Delta V$) for clean, glitch-free operation.

Verify that cumulative load currents remain below specified per-output and per-part maximums (50mA/output, 100mA/total) to ensure device longevity.

Outputs should never be pulled above VCC, and care should be taken to avoid bus contention, especially in multi-driver topologies.

In high-speed systems, attention must be paid to PCB trace inductance and termination to minimize signal integrity issues.

Power Requirements and PCB Design Tips for SN74LVC16374ADGGR

Proper layout and power supply decoupling are crucial to leveraging the speed and drive strength of the SN74LVC16374ADGGR:

Place low-ESR bypass capacitors (at least 0.1 μF recommended) close to each VCC pin; in systems with multiple VCCs, parallel with 0.01 μF or higher values if required.

Minimize ground bounce and noise coupling by ensuring low-impedance paths and controlled return currents.

Route high-speed I/O signals with short, matched traces to avoid reflections and crosstalk, particularly in designs operating above 50MHz.

Environmental Standards and Regulatory Details for SN74LVC16374ADGGR

The SN74LVC16374ADGGR fully complies with RoHS3 and is rated for MSL 1 (unlimited shelf life at ≤30°C/85%RH), supporting environmentally responsible manufacturing and assembly processes. ESD protection ensures survivability during typical handling and board assembly, and comprehensive qualification enables use in commercial and industrial applications.

Mechanical Specifications and Packaging Information for SN74LVC16374ADGGR

Available in TSSOP-48 (DGG) and related small-outline packages, the SN74LVC16374ADGGR conforms to JEDEC MO-153 and MO-118 standards for mechanical outlines and IPC-7351 for PCB footprint guidelines. Its compact design is well-suited for high-density layouts while facilitating automated pick-and-place and reflow soldering.

Detailed mechanical drawings further specify for board-level integration, including recommendations for solder paste stencil and pad definitions for high-reliability assembly.

Alternative and Substitute Options for SN74LVC16374ADGGR

For engineers evaluating supply chain resilience or second-sourcing needs, the SN74LVC16374A family encompasses a range of pin-compatible variants with similar logic and electrical behavior. Key potential alternatives from Texas Instruments and other reputable vendors include:

SN74LVC16374AN (standard packaging density variant)

74LCX16374 (Fairchild/ON Semiconductor)—similar function and pinout for many applications

74ABT16374, 74ACT16374—legacy high-speed alternatives, check logic levels and power compatibility

Consult cross-reference tools and detailed datasheets to ensure full pin/parameter equivalence when switching vendors or device series, paying close attention to input thresholds and output drive ratings for system compatibility.

Conclusion

The SN74LVC16374ADGGR provides engineers and procurement professionals with a robust, feature-rich solution for modern 16-bit flip-flop bus interface needs. Its ability to directly interface disparate voltage domains, combined with strong drive capabilities and high ESD immunity, makes it ideal for high-performance digital systems facing evolving requirements for bandwidth, integration, and mixed-voltage compatibility.

Understanding the device’s features, proper implementation guidelines, and available alternatives enables system designers to create reliable, sustainable architectures for a broad range of computing and communication platforms.