Texas Instruments SN74LVTH574DBR

Overview

SN74LVTH574DBR from Texas Instruments is a 3.3-V ABT octal edge-triggered D-type flip-flop with 3-state outputs in SSOP-20 package, supporting mixed-mode 5-V input/output operation at 3.3-V V_CC, 150-MHz clock frequency, and bus-hold on all data inputs. It serves as a level-shifting latch in high-speed digital bus interfaces for industrial control backplanes.

For engineers reviewing the SN74LVTH574DBR datasheet, SN74LVTH574DBR pinout, SN74LVTH574DBR application, or SN74LVTH574DBR equivalent, key selection criteria include its 2.7–3.6-V supply range, I_off/power-up 3-state for hot insertion, ±100 µA I_off, 0.55-V V_OL at 64 mA, and bus-hold elimination of external pull resistors.

Technical Context

This device implements eight independent positive-edge-triggered D-type flip-flops with synchronous parallel loading and asynchronous 3-state output control via OE. Each channel latches D-input logic on CLK↑ and drives Q-output only when OE is low; OE high forces high-impedance state without affecting internal register state.

It integrates active bus-hold circuitry (±75 µA hold current at V_CC = 3 V) and I_off protection enabling safe hot-insertion into live 5-V buses. The ABT (Advanced BiCMOS Technology) architecture delivers TTL-compatible drive strength (64 mA sink, 32 mA source) while maintaining 3.3-V core logic compatibility.

Key Specifications

Pinout & Package

SN74LVTH574DBR uses a 20-pin SSOP (Shrink Small Outline Package) with 0.65-mm lead pitch, 7.4-mm body width, and 2.0-mm max height per JEDEC MO-150. Pin 1 index is marked by a corner chamfer.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D-type latch applications.

Compared with SN74LVC574APWR and 74ALVCH162374DGGR, the SN74LVTH574DBR uniquely combines 5-V-tolerant inputs, integrated bus-hold, I_off-enabled hot insertion, and 64-mA drive in a compact SSOP-20 package-making it optimal for retrofitting 3.3-V logic into legacy 5-V infrastructure without layout changes.

Availability

SN74LVTH574DBR is available at Aetrix Electronics and suitable for industrial backplane interfaces, automated test equipment data capture, and programmable logic controller I/O expansion requiring stable component supply across extended temperature ranges (−40°C to 85°C).

Supply support for SN74LVTH574DBR 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 over 90 years of innovation in industrial, automotive, and communications markets.

The SN74LVTH574DBR belongs to TI's ABT logic family, engineered for mixed-voltage system interfacing-specifically bridging 3.3-V logic domains to 5-V legacy buses while ensuring robustness in harsh electrical environments.

FAQ

What is the maximum clock frequency supported by the SN74LVTH574DBR?

The SN74LVTH574DBR supports a maximum clock frequency of 150 MHz across its full operating temperature range (−40°C to 85°C) and supply voltage range (2.7 V to 3.6 V). This specification is verified under CL = 50 pF load conditions and ensures reliable edge-triggered latching performance in high-speed parallel bus applications.

Does the SN74LVTH574DBR require external pullup or pulldown resistors on its data inputs?

No, the SN74LVTH574DBR does not require external pullup or pulldown resistors on its data inputs because it integrates active bus-hold circuitry on all eight D-inputs. This feature maintains unused or floating inputs at valid logic levels, eliminating BOM components and reducing PCB routing complexity.

Can the SN74LVTH574DBR be used in hot-insertion applications?

Yes, the SN74LVTH574DBR supports hot insertion through two dedicated features: I_off circuitry disables outputs during power-down to prevent damaging current backflow, and power-up 3-state forces outputs into high-impedance during power ramp-up to avoid bus contention-both confirmed per TI's SCBS688G datasheet.

What is the output drive capability of the SN74LVTH574DBR at 3.3-V V_CC?

At 3.3-V V_CC, the SN74LVTH574DBR delivers 64 mA sink current (I_OL) and −32 mA source current (I_OH) per output. These values meet standard TTL drive requirements and ensure compatibility with 5-V loads while maintaining low V_OL (0.55 V) and controlled V_OH (2.0 V minimum) under full load.

Is the SN74LVTH574DBR compatible with 5-V input signals while operating at 3.3-V V_CC?

Yes, the SN74LVTH574DBR accepts 5-V input signals while operating from a 3.3-V V_CC, supporting mixed-mode signal operation. Its input voltage range extends to 5.5 V, and absolute maximum ratings permit up to 7 V on inputs-enabling direct interfacing with 5-V microcontrollers, sensors, or legacy peripherals without level-shifting circuitry.