STMicroelectronics 74LCX574MTR

Overview

74LCX574MTR from STMicroelectronics is an octal non-inverting D-type flip-flop with 3-state outputs, 5V-tolerant I/O, and 2.0–3.6V operation. It features 150 MHz minimum clock frequency at VCC = 3V, ±24 mA output drive, symmetrical tPLH/tPHL propagation delays, and latch-up immunity >500 mA per JESD17 - deployed in 3.3V PCI bus interface and low-power high-speed data latching applications.

For engineers reviewing the 74LCX574MTR datasheet, 74LCX574MTR pinout, 74LCX574MTR application, or 74LCX574MTR equivalent, key selection criteria include 5V-tolerant input/output compatibility with legacy systems, 3-state output enable timing (tPZL/tPLZ ≤ 9.5 ns), DC/AC electrical specs across –55°C to +125°C, and SO-20 package mechanical dimensions for PCB layout verification.

Technical Context

This device implements eight edge-triggered D-type latches synchronized on the LOW-to-HIGH clock transition, with independent 3-state control via active-low OE. Internal operation continues regardless of OE state - enabling data capture while outputs are tri-stated.

Designed for mixed-voltage system interfacing, it guarantees PCI bus signal levels at 24 mA drive strength and supports 1.5V data retention. Input protection circuits deliver >2 kV HBM ESD immunity, and sub-micron C2MOS fabrication ensures AC/ACT-equivalent speed at 3.3V with reduced power consumption.

Key Specifications

Pinout & Package

74LCX574MTR is housed in a 20-pin SOIC (Small Outline Integrated Circuit) package with 0.300-inch body width and 1.27 mm pitch. Pin 1 is marked by a beveled corner or notch; pin numbering follows standard counter-clockwise sequence from top-left.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVC574APW and SN74LVCH16374ADGGR, the 74LCX574MTR uniquely delivers 5V-tolerant I/O in a compact SO-20 package with guaranteed PCI-level drive strength - making it irreplaceable in legacy-compatible 3.3V bus interface designs requiring zero external components.

Availability

74LCX574MTR is available at Aetrix Electronics and suitable for PCI bus interface, 3.3V/5V mixed-voltage system, and low-power data acquisition applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 74LCX574MTR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and discrete devices for automotive, industrial, and consumer markets.

The 74LCX logic family was engineered specifically for high-speed, low-voltage 3.3V operation with backward compatibility to 5V systems - targeting PCI, memory interface, and mixed-signal embedded applications where power efficiency and signal integrity are critical.

FAQ

Is 74LCX574MTR compatible with 5V TTL logic inputs and outputs?

Yes - all inputs and outputs are fully 5V tolerant, meaning they accept 0–5.5V input signals and safely drive 5V loads without damage or level-shifting circuitry. This is confirmed by Absolute Maximum Ratings (VI, VO ≤ +7.0V) and Recommended Operating Conditions (VI, VO up to 5.5V) in the official STMicroelectronics datasheet Rev. 5.

What is the maximum clock frequency supported across temperature and voltage ranges?

The minimum guaranteed fMAX is 150 MHz at VCC = 3.0–3.6V and TA = –55°C to +125°C. At VCC = 2.7V, fMAX drops to 125 MHz (not explicitly stated but derivable from tW = 3.3 ns minimum pulse width). Performance remains stable across the full industrial temperature range without derating.

Does OE affect internal latch behavior when asserted high?

No - asserting OE high places Q0–Q7 in high-impedance state but does not interrupt internal flip-flop operation. New data can still be loaded on subsequent CK rising edges, and previously stored data remains intact. This is explicitly documented in the functional description: "The Output control does not affect the internal operation of flip flops."

What package variant does MTR suffix indicate, and are there lead-free options?

The MTR suffix denotes tape-and-reel packaging in the SO-20 (Small Outline, 20-pin) package. Per STMicroelectronics documentation, this variant is RoHS-compliant and lead-free, with JEDEC-standard SOIC mechanical dimensions (12.6–13.0 mm length, 7.4–7.6 mm width, 2.35–2.65 mm height). No leaded version is offered for this order code.