Texas Instruments SN74LV574ADW

Overview

SN74LV574ADW from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, designed for 2-V to 5.5-V V_CC operation and featuring 7.1-ns maximum propagation delay at 5 V, I_off-enabled partial-power-down capability, and mixed-mode voltage interface support. It serves as a bus-interface register in LED display drivers and network switch I/O expansion circuits.

For engineers reviewing the SN74LV574ADW datasheet, SN74LV574ADW pinout, SN74LV574ADW application, or SN74LV574ADW equivalent, this page delivers verified electrical specs, SOIC-20 package mapping, functional timing behavior, and real-world implementation guidance for industrial and telecom bus buffering.

Technical Context

The SN74LV574ADW implements eight independent D-type latches synchronized to the rising edge of CLK, with output-enable (OE) control enabling high-impedance state for bus sharing. Its balanced CMOS 3-state outputs drive capacitive loads up to 50 pF while maintaining controlled edge rates to minimize ringing.

It supports mixed-mode signaling: inputs tolerate 5.5 V regardless of V_CC, enabling level translation from higher-voltage logic domains into 2.5-V/3.3-V systems. The I_off circuitry disables all outputs when V_CC = 0 V, preventing backflow current during partial power-down sequences.

Key Specifications

Pinout & Package

SN74LV574ADW uses a 20-pin SOIC (DW) package measuring 10.3 mm × 7.5 mm, optimized for through-hole and surface-mount assembly in space-constrained industrial PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC574APWR and 74LVX574M, the SN74LV574ADW uniquely balances wide supply range, industrial temperature tolerance, and certified I_off protection-making it optimal for telecom and motor control systems requiring robust power sequencing.

Availability

SN74LV574ADW is available at Aetrix Electronics and suitable for LED displays, network switches, and telecom infrastructure requiring stable component supply across extended product lifecycles.

Supply support for SN74LV574ADW 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 for industrial, automotive, and communications markets.

The SN74LV574ADW belongs to TI's LV logic family, engineered for low-voltage operation with robust noise immunity and mixed-signal compatibility in high-reliability infrastructure equipment.

FAQ

What is the maximum clock frequency supported by SN74LV574ADW?

The SN74LV574ADW supports up to 130 MHz at V_CC = 5 V with C_L = 15 pF, and 80 MHz at V_CC = 3.3 V under same load conditions. These values derive from f_max specifications in the TI datasheet SCLS412K, confirmed across temperature and voltage corners. For reliable operation, maintain setup/hold times (t_su/t_h) per datasheet tables and avoid exceeding 50-pF total capacitive load.

Does SN74LV574ADW support 5-V input signals when powered from 3.3-V V_CC?

Yes, SN74LV574ADW features 5.5-V-tolerant inputs, allowing direct connection of 5-V logic signals to D and CLK pins while V_CC is at 3.3 V. This mixed-mode capability is explicitly specified in Section 6.3 of the datasheet and enables seamless interfacing with legacy 5-V microcontrollers without external level shifters.

How does the I_off feature function in SN74LV574ADW?

The I_off circuitry in SN74LV574ADW disables all outputs when V_CC = 0 V, limiting leakage current to ≤5 µA per pin. This prevents back-current flow from live bus lines into unpowered sections of a system-a critical requirement for hot-swap I/O modules and redundant power architectures. The feature is tested per JESD78 and documented in Section 6.5 of the SN74LV574ADW datasheet.

What is the recommended decoupling for SN74LV574ADW?

Texas Instruments recommends a 0.1-µF ceramic capacitor placed physically adjacent to the V_CC and GND pins of SN74LV574ADW. This placement minimizes inductance and suppresses high-frequency supply noise generated during output switching. For systems with multiple SN74LV574ADW devices, add bulk capacitance (e.g., 4.7-µF tantalum) at the board-level power entry point as described in Section 9.3 of the datasheet.

Can SN74LV574ADW outputs drive a 50-pF capacitive load reliably?

Yes, SN74LV574ADW is fully characterized for C_L = 50 pF across all V_CC ranges (2.5 V, 3.3 V, 5 V), with guaranteed t_pd and timing margins in Sections 6.9–6.11 of the datasheet. At 3.3 V, propagation delay remains ≤19 ns and enable/disable times stay within 22 ns, ensuring signal integrity in dense PCB layouts with moderate trace capacitance.