74LS109 DIP Dual J-Not-K Positive-Edge-Triggered Flip-Flop With Clear and Preset
The 74LS109 is a high speed TTL integrated circuit containing two independent J-Not-K flip flops. This specific configuration features a J input and an active low K input, which allows it to function as a D-type flip flop when the inputs are tied together. Unlike negative edge devices, the 74LS109 transfers data from the inputs to the outputs on the low to high transition of the clock pulse.
Each flip flop within the IC includes individual set and reset inputs, labeled as preset and clear. These inputs are asynchronous and active low, allowing the user to force the output state regardless of the clock or data inputs. The use of low power Schottky technology provides a balance of high frequency operation and low power dissipation, making it suitable for complex digital systems and timing circuits.
KEY FEATURES
- Dual J-Not-K flip flops with independent controls
- Positive edge triggered clocking for synchronous operation
- Asynchronous active low preset and clear inputs
- Versatile input logic for toggle or data storage modes
- Low power Schottky design for high speed efficiency
- Standard 16 pin dual in line package format
SPECIFICATIONS
- Supply Voltage 4.75V to 5.25V
- Operating Temperature 0 to 70 Celsius
- Logic Type TTL Low Power Schottky
- Propagation Delay 15ns
- Maximum Clock Frequency 25MHz
- High Level Output Current -0.4mA
- Low Level Output Current 8mA
INTERFACES
- 1J Flip flop 1 J input
- 1KBAR Flip flop 1 Inverted K input
- 1PRE Flip flop 1 Preset input active low
- 1CLR Flip flop 1 Clear input active low
- 1CLK Flip flop 1 Clock input positive edge
- 1Q Flip flop 1 True output
- 1QBAR Flip flop 1 Complementary output
- 2J Flip flop 2 J input
- 2KBAR Flip flop 2 Inverted K input
- 2PRE Flip flop 2 Preset input active low
- 2CLR Flip flop 2 Clear input active low
- 2CLK Flip flop 2 Clock input positive edge
- 2Q Flip flop 2 True output
- 2QBAR Flip flop 2 Complementary output
- VCC Positive supply voltage
- GND Ground reference
