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SN74HCT574DWR

Octal D-type flip-flop, 3-state, 4.5-5.5V, TTL, DIP/SO-20

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Manufacturer Part：

SN74HCT574DWR

Package：

SOIC-20

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Description

Product Overview

The SN74HCT574DWR from TI is an octal D-type edge-triggered flip-flop with 3-state outputs in the HCT (TTL-compatible input) family. The 3-state outputs enable bus sharing, and TTL-compatible inputs allow direct interfacing with bipolar or 5V TTL logic.

Key Specifications

Function Octal D-type flip-flop with 3-state output
Supply Voltage 4.5V to 5.5V
Propagation Delay 20 ns at 5V
Output Drive ±6 mA at 5V
Input Logic TTL compatible (HCT)
Package SOIC-20 (7.6×10.3mm)

Working Principle

On the rising edge of CLK, the 8 D inputs are captured and stored. The active-low OE controls 3-state outputs for bus sharing. When OE=HIGH, outputs are high-impedance. The HCT variant has TTL-compatible input thresholds (VIH=2V, VIL=0.8V) while maintaining CMOS output levels for noise margin.

Applications

  • 5V bus register with tri-state
  • Output port latch
  • Microprocessor I/O expansion
  • TTL-to-CMOS interface

The SN74HCT574DWR from TI is an octal D-type edge-triggered flip-flop with 3-state outputs in the HCT (TTL-compatible input) family. The 3-state outputs enable bus sharing, and TTL-compatible inputs allow direct interfacing with bipolar or 5V TTL logic.

On the rising edge of CLK, the 8 D inputs are captured and stored. The active-low OE controls 3-state outputs for bus sharing. When OE=HIGH, outputs are high-impedance. The HCT variant has TTL-compatible input thresholds (VIH=2V, VIL=0.8V) while maintaining CMOS output levels for noise margin.

Pin Name Description
1 OE Output enable (active low)
2-9 D1-D8 Data inputs
10 GND Ground
11 CLK Clock
12-19 Q1-Q8 3-state outputs
20 VCC 5V supply
  • 5V bus register with tri-state
  • Output port latch
  • Microprocessor I/O expansion
  • TTL-to-CMOS interface
Model Manufacturer Key Difference
74HC574 Nexperia CMOS input version
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Contact Information

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Tel / WhatsApp: +86 13760382860

Service & Packaging

Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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