Texas Instruments SN74LVTH16374DLG4

Overview

SN74LVTH16374DLG4 from Texas Instruments is a 3.3-V ABT 16-bit edge-triggered D-type flip-flop with 3-state outputs in SSOP-48 package, supporting mixed-mode 5-V input compatibility and hot insertion. It features bus-hold on all data inputs, Ioff protection, distributed VCC/GND pins, and operates from 2.7 V to 3.6 V. It is used in high-speed bidirectional bus interfaces and I/O port expansion for industrial control backplanes.

For engineers reviewing the SN74LVTH16374DLG4 datasheet, SN74LVTH16374DLG4 pinout, SN74LVTH16374DLG4 application, or SN74LVTH16374DLG4 equivalent, key selection criteria include its 160 MHz max clock frequency, ±100 µA Ioff at VCC = 0, 0.55 V max VOL at 64 mA, bus-hold functionality eliminating external resistors, and SSOP-48 thermal performance (θJA = 63°C/W).

Technical Context

The SN74LVTH16374DLG4 implements two independent 8-bit edge-triggered D-type flip-flop banks, each with dedicated clock (CLK) and output-enable (OE) controls. Its Advanced BiCMOS Technology (ABT) enables 3.3-V operation while accepting 5-V-tolerant inputs - critical for bridging legacy 5-V logic domains with modern low-voltage systems.

It supports true hot-insertion via Ioff and power-up 3-state circuitry: outputs enter high-impedance state during power ramp (VCC < 1.5 V), and Ioff blocks reverse current when powered down. Bus-hold circuitry actively maintains valid logic states on undriven D inputs without external components.

Key Specifications

Pinout & Package

SN74LVTH16374DLG4 uses a 48-pin SSOP (Shrink Small Outline Package) with 0.5 mm pitch, 12.6 mm × 6.2 mm body size, and 1.2 mm max height. Pin 1 is marked by a beveled corner; package complies with JEDEC MO-153.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVTH16374DLG4, SN74LVC16374DGGR sacrifices 5-V input tolerance and bus-hold for lower static power, while 74ALVCH16374MTD trades Ioff and hot-insertion reliability for higher speed - making SN74LVTH16374DLG4 uniquely suited for ruggedized, mixed-voltage, hot-swappable industrial designs.

Availability

SN74LVTH16374DLG4 is available at Aetrix Electronics and suitable for industrial backplane expansion, memory interface buffering, telecom line card data aggregation, and automotive body control module bus interfacing requiring stable component supply across extended temperature ranges (–40°C to 85°C).

Supply support for SN74LVTH16374DLG4 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 experience in high-reliability interface and timing products.

The SN74LVTH16374DLG4 belongs to TI's Widebus™ family of advanced 3.3-V ABT logic devices, designed specifically for robust, mixed-voltage, hot-pluggable system interconnects in industrial, telecom, and automotive infrastructure.

FAQ

What is the maximum clock frequency supported by SN74LVTH16374DLG4?

The SN74LVTH16374DLG4 supports a maximum clock frequency of 160 MHz under recommended operating conditions (VCC = 3.3 V ± 0.3 V, TA = 25°C, CL = 50 pF). This value is guaranteed across the full commercial temperature range (–40°C to 85°C) and applies to both 8-bit banks independently. Timing parameters such as tsu (2.9 ns min) and th (0.8 ns min) ensure reliable setup and hold margins at this rate. The SN74LVTH16374DLG4 achieves this performance using Advanced BiCMOS Technology (ABT) with optimized internal propagation paths.

Does SN74LVTH16374DLG4 support 5-V input signals while operating at 3.3-V VCC?

Yes, SN74LVTH16374DLG4 fully supports 5-V-tolerant inputs with VCC = 3.3 V. Its input voltage range is specified to 5.5 V, allowing direct connection to 5-V TTL or CMOS logic without level shifters. This mixed-mode capability is enabled by ABT process design and verified across the full operating temperature range. Input clamp current remains within safe limits (±50 mA), and VIH/VIL thresholds (2.0 V/0.8 V) maintain compatibility with standard TTL logic levels. The SN74LVTH16374DLG4 leverages this feature in bridging legacy 5-V subsystems with modern 3.3-V cores.

How does the bus-hold function work on SN74LVTH16374DLG4, and what benefit does it provide?

The SN74LVTH16374DLG4 integrates active bus-hold circuitry on all data inputs (1D1–1D8, 2D1–2D8), which detects undriven or floating states and applies ±750 µA feedback current to retain the last valid logic level. This eliminates the need for external pullup or pulldown resistors, reducing BOM count, PCB area, and potential signal integrity issues from resistor parasitics. Bus-hold operates independently of OE and CLK, remains functional during power-up/down transitions, and is compatible with hot-insertion protocols. In practice, this makes the SN74LVTH16374DLG4 ideal for modular backplane designs where connectors may be partially mated.

What thermal characteristics apply to SN74LVTH16374DLG4 in the DL package?

SN74LVTH16374DLG4 in the SSOP-48 (DL) package has a junction-to-ambient thermal resistance (θJA) of 63°C/W, measured per JESD 51-7 on a standard 4-layer JEDEC test board. This value reflects its ability to dissipate heat under typical airflow conditions and supports continuous operation at full drive strength (64 mA per output) up to 85°C ambient. The DL package uses 12 VCC and 12 GND pins distributed across the perimeter to minimize thermal gradients and reduce simultaneous switching noise. For high-density layouts, thermal vias under exposed pad areas (if present) and copper pour on inner layers further improve θJA in customer designs.

Is SN74LVTH16374DLG4 suitable for hot-insertion applications, and what features enable this?

Yes, SN74LVTH16374DLG4 is explicitly designed for hot-insertion applications. It incorporates two key protections: Ioff circuitry disables outputs when VCC = 0, preventing damaging reverse current flow from live backplane traces into the unpowered device; and power-up 3-state circuitry forces all outputs into high-impedance during VCC ramp (0–1.5 V), avoiding bus contention. These features are production-tested per TI's specifications and validated across –40°C to 85°C. The SN74LVTH16374DLG4 also meets JESD 22 ESD standards (2000-V HBM, 200-V MM), ensuring robustness during handling and insertion. No external components are required to achieve compliant hot-swap behavior.