74LS574 Octal Edge Triggered D-Type Flip-Flop IC With Tri-State Outputs

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The 74LS574 is a part of the 74XXYY IC series. 74LS574 is an 8-bit, edge triggered register coupled to eight 3-State output buffers. The two sections of the IC are controlled independently by the clock (CP) and Output Enable (OE) control gates. The register is fully edge-triggered. The state of each D input, one setup time before the Low-to-High clock transition is transferred to the corresponding flip-flop’s Q output. The 3-State output buffers are designed to drive heavily loaded 3-State buses, MOS memories, or MOS microprocessors. The active Low Output Enable (OE) controls all eight 3-State buffers independently of the latch operation. When OE is Low, the latched or transparent data appears at the outputs. When OE is High, the outputs are in high impedance “off” state, which means they will neither drive nor load the bus.

What is a D-Type Flip-Flop?

A D-type Latch/flip-flop is best described as a clocked latch, that has two stable states. A D-type latch operates with a delay in input by one clock cycle. Thus, by cascading many D-type flip-flops delay circuits can be created, which are used in many applications such as in digital television systems. A D-type flip-flop is also known as a D flip-flop or a delay flip-flop.

74LS574 Pinout

74LS574 Pin Configuration

Pin NoPin NameDescription
1OE’Active Low 3-State Output Enable Input
2D0Data Input Pin D0
3D1Data Input Pin D1
4D2Data Input Pin D2
5D3Data Input Pin D3
6D4Data Input Pin D4
7D5Data Input Pin D5
8D6Data Input Pin D6
9D7Data Input Pin D7
10GNDGround Pin
11CP’Clock Pulse Input (Active Low)
12O73-State Output O7
13O63-State Output O6
14O53-State Output O5
15O43-State Output O4
16O33-State Output O3
17O23-State Output O2
18O13-State Output O1
19O03-State Output O0
20VccChip Supply Voltage

74LS574 Features & Specifications

  • Channels (#): 8
  • Technology Family: LS
  • VCC (Min) (V): 4.5
  • VCC (Max) (V): 5.5
  • Input type: Bipolar
  • Output type: 3-State
  • Clock Frequency (Max) (MHz): 100
  • IOL (Max) (mA): 24
  • IOH (Max) (mA): -3
  • ICC (Max) (uA): 86000
  • Propagation speed: (tpd 5-10ns)
  • Edge-Triggered D-Type Inputs
  • Buffered Positive Edge-Triggered Clock
  • Inputs and Outputs on the opposite side of the package allow easy interface to Microprocessors
  • Useful as an Input or Output port for Microprocessors
  • 3-State Outputs for Bus interfacing
  • Common Output Enable
  • 3-State Outputs glitch-free during power-up and power-down
  • ESD Protection > 4000 Volts

Applications

  • Serves as a digital building block for a wide variety of temporary data storage & processing devices such as SRAMs & DRAMs etc.
  • Also Useful as Input or Output Port for Microprocessors

You can download this datasheet for 74LS574 Octal Edge Triggered D-Type Flip-Flop IC from the link given below:

See Also: 74LS122 Retriggerable Monostable Multivibrator IC – Datasheet | 74LS93 4-Bit Binary/Decade Counter IC – Datasheet | 74LS86 Quad 2-Input Exclusive OR (XOR) Gate IC- Datasheet

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