Texas Instruments SN74LVTH574NSR

Overview

SN74LVTH574NSR from Texas Instruments is a 3.3-V ABT octal edge-triggered D-type flip-flop with 3-state outputs, designed for mixed-mode signal operation (5-V inputs/outputs with 3.3-V V_CC), supporting bus-hold on all data inputs and hot-insertion via I_off and power-up 3-state. It operates from 2.7 V to 3.6 V, delivers 64 mA low-level output drive at V_CC = 3 V, and achieves 150 MHz clock frequency in industrial temperature range (−40°C to 85°C), used in 3.3-V/5-V interface buffering and address/data latching in embedded control systems.

For engineers reviewing the SN74LVTH574NSR datasheet, SN74LVTH574NSR pinout, SN74LVTH574NSR application, or SN74LVTH574NSR equivalent, key selection considerations include its 20-pin SOP-NS package, bus-hold input retention, TTL-compatible 5-V tolerant inputs, 3-state output enable timing (t_PZH/t_PLZ ≤ 6.5 ns), and support for unregulated battery operation down to 2.7 V.

Technical Context

This device implements eight independent positive-edge-triggered D-type flip-flops with synchronous parallel loading and asynchronous 3-state output control via OE. Each channel latches data on CLK↑ while OE remains low; when OE is high, all Q outputs enter high-impedance state without affecting internal latch states.

It integrates active bus-hold circuitry on all eight D inputs (±75 μA hold current at V_CC = 3 V), eliminating external pull resistors, and features I_off protection (±100 μA) and power-up 3-state logic to prevent backdrive during hot insertion. Absolute maximum ratings allow 7-V input tolerance and −0.5 V to 4.6 V supply range.

Key Specifications

Pinout & Package

SOP-NS package: 20-pin plastic small-outline package, 0.635 mm pitch, 7.5 mm × 5.3 mm body, 2.0 mm max height, gull-wing leads, RoHS-compliant NiPdAu lead finish, MSL Level-1 (260°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC574APW and 74ALVC162374DGGR, the SN74LVTH574NSR uniquely combines 5-V input tolerance, integrated bus-hold, and hot-insertion capability in a standard 20-pin SOP footprint - making it irreplaceable in mixed-voltage legacy upgrades without layout changes.

Availability

SN74LVTH574NSR is available at Aetrix Electronics and suitable for industrial bus interface, memory address latching, FPGA I/O expansion, and hot-swappable module control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVTH574NSR 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 digital ICs.

The SN74LVTH574NSR belongs to TI's ABT logic family, engineered for robust 3.3-V/5-V mixed-signal interoperability in industrial, telecom, and computing infrastructure where voltage translation and bus stability are critical.

FAQ

What is the operating voltage range for the SN74LVTH574NSR?

The SN74LVTH574NSR operates from 2.7 V to 3.6 V on V_CC. Its inputs tolerate up to 5.5 V, enabling direct connection to 5-V logic without level shifters. This range supports unregulated battery supplies and ensures functionality across wide thermal and load conditions, as verified in TI's SCBS688G datasheet Section 4.

Does the SN74LVTH574NSR require external pull-up or pull-down resistors on its data inputs?

No. The SN74LVTH574NSR includes active bus-hold circuitry on all eight D inputs, maintaining valid logic states without external resistors. Per datasheet Section 2, bus-hold current is ±75 μA at V_CC = 3 V - sufficient to retain state on floating inputs, reducing BOM cost and board space.

Can the SN74LVTH574NSR be used in hot-swap applications?

Yes. The SN74LVTH574NSR supports hot insertion via I_off circuitry (±100 μA max leakage at V_CC = 0) and power-up 3-state logic, which forces outputs into high-impedance during power transitions. These features are explicitly validated per JESD 78 and documented in Section 1 of the SCBS688G datasheet.

What is the maximum clock frequency supported by the SN74LVTH574NSR?

The SN74LVTH574NSR supports a maximum clock frequency of 150 MHz across its full operating range (−40°C to 85°C, V_CC = 2.7 V to 3.6 V), as confirmed in the "Timing Requirements" table (Section 6) of the SCBS688G datasheet. This applies to both rising-edge triggering and output propagation delays.

Which package type does the SN74LVTH574NSR use, and what are its key mechanical dimensions?

The SN74LVTH574NSR uses the SOP-NS (Small Outline Package – Narrow) package: 20-pin, 0.635 mm lead pitch, 7.5 mm × 5.3 mm body size, 2.0 mm maximum height, and gull-wing leads. Mechanical details are defined in TI's DB0020A package drawing, referenced in the Ordering Information section of SCBS688G.