Texas Instruments SN74LVC574AQDWREP

Overview

SN74LVC574AQDWREP from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, designed for 2.0–3.6 V operation and mixed-mode signal interfacing (5-V-tolerant inputs). It features 8-bit positive-edge clocked data latching, independent output-enable control, and I_off support for partial-power-down mode. Used in bidirectional bus driving and I/O port buffering in industrial control and automotive ECUs.

For engineers reviewing the SN74LVC574AQDWREP datasheet, SN74LVC574AQDWREP pinout, SN74LVC574AQDWREP application, or SN74LVC574AQDWREP equivalent, key selection criteria include t_pd ≤ 7 ns at 3.3 V, 5.5-V input tolerance, I_off protection, 3-state drive capability up to ±24 mA, and extended temperature operation from –40°C to 125°C.

Technical Context

This device implements eight identical D-type flip-flops with synchronous positive-edge clocking and individual 3-state output control via OE. Each flip-flop samples D-inputs on CLK rising edge and holds state until next clock event. OE operates independently of clock and does not affect internal latch operation.

Designed for mixed-voltage systems, it accepts 0–5.5 V input signals while operating from 2.0–3.6 V V_CC, enabling direct interface between 3.3-V logic and legacy 5-V peripherals. The I_off circuitry prevents current backflow during power-down, supporting hot-insertion and partial-power-down system architectures.

Key Specifications

Pinout & Package

SN74LVC574AQDWREP is packaged in a 20-pin SOIC (DW) with 1.27-mm pitch, 7.5-mm body width, and JEDEC MS-013 compliant footprint. Thermal resistance θ_JA = 58°C/W supports continuous operation at full load in ambient temperatures up to 125°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC574AQDWREP, the TSSOP variant offers smaller footprint but reduced thermal performance, while the commercial PWRE4 version sacrifices extended temperature and I_off validation for lower unit cost-neither is pin-compatible drop-in replacements without verifying thermal and reliability requirements.

Availability

SN74LVC574AQDWREP is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and medical imaging data acquisition requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for SN74LVC574AQDWREP 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 technologies, with over 90 years of innovation in high-reliability electronics.

The SN74LVC574A-EP product line delivers radiation-tolerant, extended-temperature logic devices for aerospace, defense, and automotive applications where standard commercial parts cannot meet environmental or longevity demands.

FAQ

What is the maximum clock frequency supported by SN74LVC574AQDWREP?

The SN74LVC574AQDWREP supports a maximum clock frequency of 150 MHz across its full operating range (–40°C to 125°C) at V_CC = 3.3 V ± 0.3 V. This is guaranteed by t_w (minimum pulse width) of 3.3 ns for both high and low CLK states, and confirmed by f_max = 150 MHz in the switching characteristics table of the official TI datasheet SCAS750A.

Does SN74LVC574AQDWREP support 5-V input signals while operating at 3.3 V V_CC?

Yes, SN74LVC574AQDWREP fully supports 5-V-tolerant inputs: VI can range from 0 V to 5.5 V regardless of V_CC (2.0–3.6 V). This allows direct connection to 5-V microcontrollers or sensors without external level-shifting circuitry, as explicitly stated in the "Features" and "Recommended Operating Conditions" sections of the TI datasheet.

How does the I_off feature function in SN74LVC574AQDWREP?

The I_off circuitry in SN74LVC574AQDWREP disables all outputs and blocks current flow when V_CC = 0 V, preventing damaging back-current from live bus lines into a powered-down section. This is validated per JESD22-A108 and enables safe partial-power-down operation in modular systems, as documented in the "Features" and "Description" sections of TI's SCAS750A datasheet.

What is the output drive strength of SN74LVC574AQDWREP at 3.3 V?

At V_CC = 3.3 V, SN74LVC574AQDWREP delivers ±24 mA per output in the low or high state (I_OL/I_OH), enabling direct drive of 50-pF transmission lines or multiple CMOS inputs. This value is specified in the "Electrical Characteristics" table under I_OL and I_OH test conditions and verified across –40°C to 125°C.

Is SN74LVC574AQDWREP pin-compatible with standard SN74LVC574A variants?

Yes, SN74LVC574AQDWREP shares identical pinout, functionality, and SOIC-20 (DW) package dimensions with commercial SN74LVC574A variants. Pin assignments-including CLK, OE, D1–D8, Q1–Q8, V_CC, and GND-are fully aligned per TI's DW package drawing and logic diagram in SCAS750A, enabling direct PCB reuse where extended temperature and EP qualification are required.