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Tri-State Octal D-Type Flip-Flop IC - 74HC574

Tri-State Octal D-Type Flip-Flop IC - 74HC574-Robocraze

Tri-State Octal D-Type Flip-Flop IC - 74HC574

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  • Typical propagation delay: 18 ns 
  • Wide operating voltage range: 2V–6V 
  • Low input current: 1 µA maximum 
  • Low quiescent current: 80 µA maximum 
  • Compatible with bus-oriented systems 
  • Output drive capability: 15 LS-TTL loads

Tri-State Octal D-Type Flip-Flop IC - 74HC574

The 74HC Series 74HC574 IC high-speed octal D-type flip-flops utilize advanced silicon-gate P-well CMOS technology. They possess the high noise immunity and low power consumption of standard CMOS integrated circuits, as well as the ability to drive 15 LS-TTL loads. Due to the large output drive capability and the 3-STATE feature, these devices are ideally suited for interfacing with bus lines in a bus organized system. These devices are positive edge-triggered flip-flops.

Data at the D inputs, meeting the set-up and hold time requirements, are transferred to the Q outputs on positive-going transitions of the CLOCK (CK) input. When a high logic level is applied to the OUTPUT CONTROL (OC) input, all outputs go to a high impedance state, regardless of what signals are present at the other inputs and the state of the storage elements. The 74HC logic family is speed, function, and pinout compatible with the standard 74LS logic family. All inputs are protected from damage due to static discharge by internal diode clamps to VCC and the ground. 


Pinout of 74HC574 IC

Package Includes:

  • 1 x IC - 74HC574


Supply Voltage (VCC − 0.5 to + 7.0V 
Input Voltage (VIN) −1.5V to VCC + 1.5V
Output Voltage (VOUT) − 0.5 to VCC + 0.5V
Clamp Diode Current (IIK, IOK) ± 20 mA
DC Output Current, per pin (IOUT) ± 35 mA
DC VCC or GND Current, per pin (ICC) ± 70 mA 
Storage Temperature Range (TSTG) − 65°C to + 150°C 
Power Dissipation (PD) (Note 4) 600 mW
S.O. Package only 500 mW
Lead Temperature (TL) (Soldering 10 seconds)  260°C


1.What is 74HC574?

  • The 74HC574 is an 8-bit positive-edge triggered D-type flip-flop with three output states. The device has clock (CP) and output enable (OE) inputs. On the LOW-to-HIGH clock (CP) transition, the flip-flops will save the state of their individual D-inputs that meet the set-up and hold time requirements.

2.What is the clock input in the 74HC574 IC used for?

  • The 74HC574 IC's clock input is used to synchronise the state of the flip-flops with an external signal. The input data is latched into the corresponding flip-flop on each rising edge of the clock signal.