74LS74 A flip-flop IC utilizes the Schottky TTL circuitry to produce high-speed D-type flip-flops. Each flip-flop has individual clear and set inputs, and also complementary Q and Q`(bar) outputs. 74LS74 Pinout Configuration Pin Number Pin Symbol Name Description 5,9 1Q / 2Q Output Output Pin of the Flip Flop 6,8 1Q’(bar) / 2Q’(bar) Complementary Output Inverted output pin of Flip Flop 3, 11 1CLK / 2CLK Clock Input Pin These pins must be provided with clock pulse for the flip flop 1,13 1CLR (bar) / 2CLR (bar) Clear Data Resets the flip flop by clearing its memory 2,12 1D /2D Data Input Pin Input pin of the Flip Flop 4, 10 1PRE (bar) / 2PRE (bar) PRE Input Another Input pin for Flip Flop. Also referred to as a set pin 7 Vss Ground Connected to the ground of the system 14 Vdd/Vcc Supply Voltage Powers the IC typically with 5V Features: 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: Complete Technical Details can be found in the 74LS74 datasheet given at the end of this page. Equivalents 74LVC2G80, HEF40312B How to use 74LS74: Using a Flip-Flop is pretty straight forward. Simply power the IC using the Vcc and GND pin. As told early each flip-flop operates independently, just connect the input signals 2 and 3 for using the 1st flip-flop and you will get the output at pins 5 and 6. The pin 3 should be provided with a clock source normally a PWM signal from an MCU or 555 timers is used. The pin can be used to clear the data and reset the flip flop by making it high. The complete working of the Flip flop can be understood by taking at the function table below. The symbol “X” indicates don’t care and the up-arrow indicates the rising edge of the signal. United Arab Emirates dirham - AED SKU: ENY26 Categories: All Products, Integrated Circuits
