The **SN74HC393DG4** is a high-speed CMOS device manufactured by Texas Instruments. It belongs to the 74HC family of logic gates and functions as a **Dual 4-Bit Binary Ripple Counter**. --- ### ## Technical Specifications | Feature | Specification | | :--- | :--- | | **Logic Family** | 74HC (High-Speed CMOS) | | **Function** | Dual 4-Bit Binary Ripple Counter | | **Operating Voltage** | 2.0V to 6.0V | | **Output Current** | ±5.2 mA at 6V | | **Max Frequency** | ~31 MHz (at 6V) | | **Package Type** | SOIC-14 (Surface Mount) | | **Operating Temp** | -40°C to +85°C | --- ### ### Internal Architecture The chip contains two independent 4-bit counters. Each counter consists of four master-slave T-type flip-flops. 1. **Clock Inputs ($\overline{CP}$):** These are triggered on the **high-to-low transition** (negative edge). 2. **Clear Inputs (MR):** These are asynchronous high-level active resets. When the Clear pin is pulled HIGH, all outputs ($Q_0$ through $Q_3$) for that counter are reset to LOW. 3. **Outputs:** Each counter provides four output pins, representing a binary count from $0000$ to $1111$ (0 to 15 in decimal). --- ### ### Pin Configuration The SN74HC393DG4 comes in a 14-pin SOIC package. | Pin Number | Name | Description | | :--- | :--- | :--- | | 1 | 1CP | Clock Input (Counter 1) | | 2 | 1MR | Master Reset (Counter 1) | | 3, 4, 5, 6 | 1Q0 - 1Q3 | Outputs (Counter 1) | | 7 | GND | Ground | | 8, 9, 10, 11 | 2Q3 - 2Q0 | Outputs (Counter 2) | | 12 | 2MR | Master Reset (Counter 2) | | 13 | 2CP | Clock Input (Counter 2) | | 14 | VCC | Positive Supply | --- ### ### Key Features and Use Cases * **Cascading:** Because there are two counters, you can cascade them to create an 8-bit counter (counting up to 255) by connecting the $Q_3$ output of the first counter to the clock input of the second. * **Frequency Division:** It is frequently used as a frequency divider. Each output stage ($Q_n$) divides the input frequency by $2^{n+1}$. * **Low Power:** Being CMOS-based, it consumes very little static power, making it ideal for battery-operated digital circuits. ---