74LS74 is a Dual D Flip-Flop.
The IC 74LS74 is a type of dual D-type positive edge triggered flip flop, with preset, clear, and complementary outputs. It features a large operating voltage range, wide operating conditions, and outputs directly interfaced to CMOS, NMOS, and TTL. The LOW logic level of the preset or clear inputs will set or reset outputs regardless of the logical level of the other inputs.
This blog provides you with a basic overview of the 74LS74 Flip-Flop, including its pin descriptions, functions and specifications, alternative products, etc., to help you quickly understand what 74LS74 is.
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Catalog
74LS74 Flip-Flop Pinout
74LS74 Flip-Flop Feature
- Dual D Flip Flop Package IC
- Operating Voltage: 2V to 15V
- Propagation Delay: 40nS
- Minimum High-Level Input Voltage: 2 V
- Maximum Low-Level Input Voltage: 0.8V
- Operating Temperature: 0 to 70°C
- High-Level Output Current: 8mA
- Available in 14-pin SO-14, SOT42 packages
Note: You can find complete technical details in the 74LS74 data sheet at the end of this page.
74LS74 Flip-Flop Equivalents
74LVC2G80, HEF40312B
How to use 74LS74
Using a Flip-Flop is pretty straight ahead. Just use the Vcc and GND pin to power the IC. As stated earlier, each flip-flop operates independently, just connect the input signals 2 and 3 to the 1st flip-flop and you'll get the output at pins 5 and 6. The pin 3 should be provided with a clock source that normally uses a PWM signal from the MCU or 555 timers. You can use the pin to clear the data and reset the flip flop by making it high. The complete operation of the Flip Flop can be understood by taking a look at the function table below. The symbol "X" indicates that you don't care, and the up-arrow indicates the rising edge of the signal.
You can also simulate an IC to check that it works as you wish. Here I used logic status and logic bits to see if the IC works as it should, but you can replace them with the actual circuitry of your application to check if it fits your needs. The gif file shown below can be checked with the above truth table to make sure the IC works as desired.
74LS74 Flip-Flop Applications
- Used as Shift Registers
- Memory/Control Registers
- Buffer Circuits
- Sampling Circuits
- Latching devices
74LS74 Flip-Flop Package
The dimensions for IC 74LS74 are given below. The dimensions are for the CDIP package. If you are using a different IC package, please refer to the 74LS74 data sheet.
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