Texas Instruments SN74LVC574APWRG4

Overview

SN74LVC574APWRG4 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 TSSOP packaging, 7 ns max propagation delay at 3.3 V, I_off support for partial-power-down mode, and mixed-mode signal operation enabling 5-V input tolerance with 3.3-V V_CC. It is used in bidirectional bus drivers and I/O port buffering in industrial control systems.

For engineers reviewing the SN74LVC574APWRG4 datasheet, SN74LVC574APWRG4 pinout, SN74LVC574APWRG4 application, or SN74LVC574APWRG4 equivalent, key selection criteria include its 3-state output enable timing (t_en/t_dis), wide V_CC range, latch-up immunity (>250 mA), ESD robustness (2000-V HBM), and compatibility with 1.8-V/2.5-V/3.3-V logic domains.

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. Each output drives high-impedance (Z), high, or low states without affecting internal flip-flop operation - enabling data retention during bus isolation.

Its I_off circuitry actively disables outputs during power-down to prevent backflow current, while input tolerance up to 5.5 V allows safe interfacing with legacy 5-V peripherals. The design supports stable operation across −40°C to 125°C and meets JESD 17 latch-up and JESD 22 ESD standards.

Key Specifications

Pinout & Package

TSSOP-20 package (PW), 6.5 mm × 4.4 mm body, 0.65 mm pitch, exposed pad not present, RoHS-compliant NIPDAU lead 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 SN74LVC574APWR and 74LVC574PW,118, SN74LVC574APWRG4 offers identical timing and electrical performance but guarantees TI's enhanced process control, full military-grade reliability screening history, and documented support for extended-temperature industrial deployments.

Availability

SN74LVC574APWRG4 is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVC574APWRG4 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 high-reliability components.

The SN74LVC574A product line delivers robust, low-voltage CMOS logic for bus interface and data latching in harsh environments, emphasizing mixed-signal interoperability, power efficiency, and extended-temperature operation.

FAQ

What is the maximum clock frequency supported by SN74LVC574APWRG4?

The SN74LVC574APWRG4 supports a maximum clock frequency of 150 MHz at V_CC = 3.3 V ± 0.3 V and operating temperatures from −40°C to 125°C. This is validated by t_w (CLK pulse width) ≤ 3.3 ns and t_pd ≤ 7 ns. At lower V_CC levels such as 1.8 V, the max frequency reduces to 55 MHz due to slower switching characteristics.

Does SN74LVC574APWRG4 support partial-power-down operation?

Yes, SN74LVC574APWRG4 incorporates I_off circuitry that disables outputs when V_CC = 0 V, limiting leakage current to ±10 μA. This prevents damaging backflow current in systems where multiple voltage domains are powered independently, making SN74LVC574APWRG4 suitable for hot-swap and power-gating architectures.

Can SN74LVC574APWRG4 interface safely with 5-V logic inputs?

Yes, SN74LVC574APWRG4 inputs tolerate voltages up to 5.5 V regardless of V_CC, enabling direct connection to 5-V TTL or CMOS outputs without external level-shifting components. This mixed-mode capability is explicitly specified in the datasheet and verified across −40°C to 125°C.

What is the thermal resistance (θ_JA) of the SN74LVC574APWRG4 package?

The SN74LVC574APWRG4 uses a TSSOP-20 (PW) package with a thermal resistance θ_JA of 83°C/W under standard JEDEC PCB conditions (2-layer board, 1-in² copper). This value is confirmed in the "Absolute Maximum Ratings" table and applies to continuous operation at ambient temperatures up to 125°C.

How does the output-enable (OE) function interact with internal flip-flop operation in SN74LVC574APWRG4?

In SN74LVC574APWRG4, OE controls only the output buffer stage and has no effect on internal flip-flop state or clocked data capture. While OE is asserted (high), the Q outputs enter high-impedance, but D inputs remain active and new data can be latched on subsequent CLK↑ transitions - allowing seamless bus arbitration and data preloading.