Texas Instruments SN74LVC574AGQNR

Overview

SN74LVC574AGQNR from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, designed for 1.65 V to 3.6 V operation. It features 20-pin VFBGA (GQN) packaging, 7 ns max propagation delay at 3.3 V, Ioff support for partial-power-down mode, and mixed-mode signal operation enabling 5-V input compatibility with 3.3-V VCC - widely used in bus interface buffering and I/O port expansion.

For engineers reviewing the SN74LVC574AGQNR datasheet, SN74LVC574AGQNR pinout, SN74LVC574AGQNR application, or SN74LVC574AGQNR equivalent, key selection criteria include its 3-state output drive capability, latch-up immunity (>250 mA), ESD robustness (2000-V HBM), −40°C to 85°C operating range, and compatibility with high-capacitance bus loads in industrial control and data acquisition systems.

Technical Context

This device implements eight independent D-type latches triggered on the rising edge of CLK, with synchronous data capture and asynchronous 3-state control via OE. Its Ioff circuitry disables outputs during power-down to prevent backflow current, meeting JESD 17 latch-up requirements.

The logic supports mixed-voltage interfacing: inputs tolerate up to 5.5 V regardless of VCC, enabling seamless integration between 3.3-V logic domains and legacy 5-V peripherals without level shifters. Output ground bounce (VOLP < 0.8 V) and undershoot (VOHV > 2 V) are characterized at 3.3 V/25°C for signal integrity assurance.

Key Specifications

Pinout & Package

SN74LVC574AGQNR uses a 20-pin Very Thin Fine-Pitch Ball Grid Array (VFBGA) package designated GQN, measuring 3.5 mm × 4.5 mm with 0.5-mm pitch and bottom-side solder balls. The package supports automated surface-mount assembly and offers low thermal resistance (θJA = 78°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC574APWR and 74LVC574PW,118, the SN74LVC574AGQNR offers superior board-area efficiency and thermal performance (θJA = 78°C/W) in space-constrained medical or portable instrumentation, while maintaining identical functional behavior and interoperability with existing TI LVC-family designs.

Availability

SN74LVC574AGQNR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, test equipment digital pattern generation, and medical imaging data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVC574AGQNR 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 delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The SN74LVC574A product line delivers high-speed, low-voltage CMOS logic devices optimized for bus interface, data latching, and I/O expansion in mixed-signal embedded systems.

FAQ

What is the maximum clock frequency supported by SN74LVC574AGQNR?

The SN74LVC574AGQNR supports a maximum clock frequency of 150 MHz at VCC = 3.3 V and TA = −40°C to 85°C. This is validated by guaranteed timing parameters including tSU = 2 ns and tH = 1.5 ns, enabling reliable operation in high-speed digital interfaces such as memory address latching and test pattern generation where cycle-accurate timing is critical. The SN74LVC574AGQNR maintains this performance across its full specified temperature range.

Does SN74LVC574AGQNR support partial power-down operation?

Yes, SN74LVC574AGQNR includes Ioff circuitry that disables all outputs when VCC = 0 V, preventing damaging current backflow through the device during power sequencing or standby modes. This feature is explicitly characterized in the datasheet and meets JESD 78 requirements, making SN74LVC574AGQNR suitable for multi-rail systems like industrial controllers where individual voltage domains may power up/down independently.

Can SN74LVC574AGQNR interface directly with 5-V logic inputs?

Yes, SN74LVC574AGQNR inputs accept voltages up to 5.5 V regardless of VCC level (1.65 V to 3.6 V), enabling direct connection to 5-V TTL or CMOS outputs without external level-shifting components. This mixed-mode capability is confirmed in the "Recommended Operating Conditions" table and verified across temperature ranges, making SN74LVC574AGQNR ideal for bridging legacy 5-V subsystems with modern low-voltage processors.

What is the thermal resistance (θJA) of the SN74LVC574AGQNR package?

The SN74LVC574AGQNR uses the GQN VFBGA package with a specified junction-to-ambient thermal resistance (θJA) of 78°C/W under standard JEDEC conditions. This value is documented in the Absolute Maximum Ratings table and reflects typical PCB layout assumptions; actual thermal performance depends on copper area, layer count, and airflow. The SN74LVC574AGQNR's low θJA supports reliable operation in compact, thermally constrained applications such as portable medical devices.

How does the 3-state output control work on SN74LVC574AGQNR?

The SN74LVC574AGQNR uses an active-low output-enable (OE) input to place all eight Q outputs simultaneously into high-impedance state, decoupling them from the bus. OE operates asynchronously - it does not affect internal flip-flop operation, allowing new data to be latched or retained while outputs remain isolated. This behavior is confirmed in the Functional Table and Logic Diagram, and enables SN74LVC574AGQNR to serve as a bidirectional bus driver or shared resource controller in multi-master systems.