Texas Instruments SN74LVC574AQPWRQ1

Overview

SN74LVC574AQPWRQ1 from Texas Instruments is an automotive-qualified octal edge-triggered D-type flip-flop with 3-state outputs, designed for 2.0 V to 3.6 V operation, supporting mixed-mode 5-V input tolerance, 7 ns max propagation delay at 3.3 V, and Ioff partial-power-down capability - used in automotive I/O port buffering and bidirectional bus driving.

For engineers reviewing the SN74LVC574AQPWRQ1 datasheet, SN74LVC574AQPWRQ1 pinout, SN74LVC574AQPWRQ1 application, or SN74LVC574AQPWRQ1 equivalent, key selection factors include its AEC-Q100 qualification, 20-pin TSSOP package, 3.6 V absolute max input voltage, 150 MHz clock frequency support, and OE-controlled high-impedance output state for bus isolation.

Technical Context

This device implements eight independent D-type latches triggered on the positive edge of CLK, with asynchronous 3-state control via OE. Each flip-flop retains data during OE assertion, enabling concurrent register update and bus release.

It features Ioff circuitry that disables outputs during power-down to prevent backflow current, and supports mixed-voltage interfacing: inputs tolerate up to 5.5 V while operating from a 2.7–3.6 V VCC rail - critical for legacy 5-V signal integration into modern 3.3-V automotive domains.

Key Specifications

Pinout & Package

TSSOP-20 (PW) package: 6.5 mm × 4.4 mm, 1.2 mm max height, 0.65 mm pitch, RoHS-compliant NIPDAU finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC574AQPWRQ1, SN74LVC574APWRE4 lacks AEC-Q100 certification and thermal margin, while SN74LVCH16374ADGGR trades automotive robustness for wider voltage range and double bit-width - making SN74LVC574AQPWRQ1 uniquely balanced for cost-constrained, safety-critical automotive I/O expansion.

Availability

SN74LVC574AQPWRQ1 is available at Aetrix Electronics and suitable for automotive body control modules, instrument cluster interfaces, and ADAS sensor data capture requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVC574AQPWRQ1 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 automotive ICs, with over 50 years of innovation in high-reliability electronics.

The SN74LVC574A-Q1 product line delivers AEC-Q100-qualified logic devices optimized for automotive signal integrity, mixed-voltage interoperability, and robust power sequencing - targeting body electronics, infotainment, and ADAS subsystems.

FAQ

What is the maximum clock frequency supported by SN74LVC574AQPWRQ1?

The SN74LVC574AQPWRQ1 supports a maximum clock frequency of 150 MHz under recommended operating conditions (VCC = 3.3 V, TA = –40°C to +125°C). This specification is validated across the full automotive temperature range and enables reliable use in high-speed data capture applications such as sensor interface and display control subsystems where precise timing alignment is critical. The device maintains consistent performance due to its optimized CMOS architecture and low-propagation-delay design.

Does SN74LVC574AQPWRQ1 support 5-V input signals while operating from a 3.3-V supply?

Yes, SN74LVC574AQPWRQ1 supports 5-V-tolerant inputs while operating from a 2.0–3.6 V VCC supply. Its input voltage range extends to 5.5 V, enabling direct connection to legacy 5-V microcontrollers, sensors, or logic families without external level shifters. This mixed-mode capability is explicitly verified in the datasheet and is essential for automotive systems integrating older 5-V peripherals with modern 3.3-V domain controllers - a key feature confirmed for SN74LVC574AQPWRQ1 across all operating conditions.

What is the purpose of the Ioff feature in SN74LVC574AQPWRQ1?

The Ioff feature in SN74LVC574AQPWRQ1 disables all outputs when VCC = 0 V, preventing damaging current backflow through the device during partial power-down or hot-swap events. This function is critical in automotive modular ECUs where subsystems may be powered independently. For SN74LVC574AQPWRQ1, Ioff is fully characterized per JESD78 and ensures safe operation during power sequencing mismatches - a requirement explicitly met in its AEC-Q100 qualification testing.

Can SN74LVC574AQPWRQ1 drive standard TTL loads directly?

SN74LVC574AQPWRQ1 cannot directly drive standard TTL loads because its VOH minimum (2.2 V at VCC = 3.0 V, IOH = –24 mA) falls below the 2.4 V VIH threshold required by standard TTL. However, it is fully compatible with LVTTL, LVCMOS, and other 3.3-V logic families. When interfacing with legacy TTL, an external pull-up resistor or level translator is required - a limitation confirmed in the SN74LVC574AQPWRQ1's DC characteristics table and application notes.

What package type is used for SN74LVC574AQPWRQ1, and what are its key mechanical dimensions?

SN74LVC574AQPWRQ1 uses the TSSOP-20 (PW) package: 6.5 mm × 4.4 mm body size, 1.2 mm maximum height, and 0.65 mm lead pitch. It features RoHS-compliant NIPDAU plating and meets JEDEC MO-153 standards. These dimensions are standardized across TI's automotive logic portfolio and ensure compatibility with automated SMT assembly processes used in Tier 1 automotive manufacturing - specifications explicitly documented in the SN74LVC574AQPWRQ1 package outline drawing.