The TC74HC109AF is a high-speed CMOS dual JK positive-edge triggered flip-flop with preset and clear from Toshiba's TC74HC series. This device utilizes silicon gate CMOS technology to achieve high-speed operation similar to equivalent bipolar Schottky TTL devices, while maintaining the low power consumption characteristic of CMOS integrated circuits. It provides two independent JK flip-flops in a single package, each with individual J, K, clock, preset, and clear inputs.

Applications

• General purpose sequential logic
• Shift registers
• Control registers
• Synchronous counters
• Frequency dividers
• Data storage

Features

• High-speed operation: fmax = 50 MHz (typ.) at VCC = 5V
• Low power dissipation: ICC = 1μA (max.) at Ta = 25°C
• High noise immunity: VNIH = VNIL = 28 % VCC (min.)
• Individual J, K, clock, preset and clear inputs
• Positive-edge triggered clock
• Direct preset and clear inputs
• Wide operating voltage range: VCC = 2V to 6V

Benefits

• Fast switching speed enabling high-frequency operation.
• Low power consumption allowing for energy-efficient designs.
• Excellent noise immunity enhances reliability in noisy environments.
• Independent flip-flops provide flexibility in circuit design.
• Direct preset and clear inputs facilitate asynchronous setting and resetting of the flip-flops.
• Wide operating voltage range accommodates various power supply configurations.

Additional Details

The TC74HC109AF comes in a SOP16 (Small Outline Package) and operates over a wide temperature range. Each flip-flop changes its state on the positive-going edge of the clock pulse, provided that the setup and hold time requirements are met. The J and K inputs determine the next state of the flip-flop according to the JK truth table. The direct preset and clear inputs allow the flip-flop to be asynchronously set to a high state or reset to a low state, respectively, overriding all other inputs. The device's high noise immunity makes it suitable for applications in electrically noisy environments. The wide operating voltage range provides flexibility in various applications and power supply configurations. The low power consumption allows for dense packaging and reduces heat dissipation, making it suitable for compact devices.