## Technical Overview: 74LV393D,118 The **74LV393D,118** is a high-performance, low-voltage CMOS device. It functions as a **Dual 4-Bit Binary Ripple Counter**. This integrated circuit (IC) contains two independent 4-stage binary counters, each with its own Clock ($CP$) and Master Reset ($MR$) inputs. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Logic Family** | LV-CMOS (Low Voltage) | | **Function** | Dual 4-Bit Binary Ripple Counter | | **Supply Voltage ($V_{CC}$)** | 1.0V to 5.5V (Optimized for 3.3V) | | **Package** | SOIC-14 (Small Outline IC) | | **Propagation Delay** | ~12ns @ 3.3V | | **Operating Temperature** | -40°C to +125°C | | **Output Current** | 8 mA | | **Mounting Type** | Surface Mount (SMD/SMT) | --- ### 2. Pin Configuration and Functions The device is housed in a 14-pin package. Each counter is independent except for the shared power supply pins. | Pin Number | Symbol | Description | | :--- | :--- | :--- | | 1, 13 | $1\overline{CP}, 2\overline{CP}$ | Clock Inputs (High-to-Low edge triggered) | | 2, 12 | $1MR, 2MR$ | Master Reset (Asynchronous, Active High) | | 3, 4, 5, 6 | $1Q_0$ to $1Q_3$ | Parallel Outputs (Counter 1) | | 8, 9, 10, 11 | $2Q_0$ to $2Q_3$ | Parallel Outputs (Counter 2) | | 7 | $GND$ | Ground (0V) | | 14 | $V_{CC}$ | Supply Voltage | --- ### 3. Functional Operation * **Ripple Counting:** Because it is a ripple counter, the clock triggers the first flip-flop ($Q_0$), which then acts as the clock for the next flip-flop ($Q_1$), and so on. This creates a slight delay between output transitions. * **Clocking:** The counter advances on the **negative-going transition** (falling edge) of the clock pulse. * **Resetting:** Applying a HIGH level to the Master Reset ($MR$) pin overrides the clock and immediately resets all four bits of that counter to LOW (0000). * **Cascading:** Both 4-bit counters can be concatenated to form a single **8-bit ripple counter** by connecting the $Q_3$ output of the first counter to the $\overline{CP}$ input of the second. --- ### 4. Typical Applications 1. **Frequency Division:** Dividing a high-frequency clock signal by powers of 2 (up to $2^8$ if cascaded). 2. **Time Delay Generation:** Creating specific intervals in digital timing circuits. 3. **Digital Counters:** Used in displays or systems requiring event counting. 4. **State Machines:** Serving as a basic sequence generator for low-complexity logic. --- ### 5. Part Number Suffix Meaning The suffix **"118"** specifically refers to the packaging method used by the manufacturer (Nexperia): * **D:** Denotes the SOIC package. * **118:** Indicates that the parts are supplied on a **13-inch Reel** (Tape & Reel) for automated assembly.