The TC74HC390F is a high-speed CMOS dual decade counter manufactured by Toshiba Semiconductor and Storage. It is fabricated with silicon gate CMOS technology, achieving high-speed operation similar to equivalent Schottky TTL while maintaining the low power dissipation characteristic of CMOS. This device contains two independent 4-stage counters which can be configured in a variety of ways.

Applications

• Frequency dividers
• Digital timers
• Event counters
• Clock generators
• Industrial control systems
• Consumer electronics

Features

• High-speed operation: fmax = 60 MHz (typ.) at VCC = 5V
• Low power dissipation: ICC = 4 μA (max.) at Ta = 25°C
• High noise immunity: VNIH = VNIL = 28 % VCC (min.)
• Two independent 4-stage counters
• Dual decade or binary counting
• Reset inputs for each counter
• Output drive capability: 10 LSTTL loads
• Wide operating voltage range: VCC = 2 V to 6 V

Benefits

• High-speed performance allows use in high-frequency applications.
• Low power consumption extends battery life in portable devices and reduces overall system power consumption.
• High noise immunity provides reliable operation in noisy industrial environments.
• Versatile counting options enables flexible system design.
• Independent counters allow for dual-channel counting or frequency division.
• Wide operating voltage range allows use in diverse power supply environments.

Additional Details

Each counter within the TC74HC390F can be used as a divide-by-2 counter (using the A input) or as a divide-by-5 counter (using the B input). By cascading the outputs, it's possible to achieve divide-by-10 (decade) or divide-by-100 counting functions. Each counter also has a separate reset input (MR1 and MR2) that, when HIGH, resets the counter outputs to a low state. This allows for synchronous or asynchronous reset operations.

The operating temperature range is typically -40°C to +85°C. The package is a SOP16.