The **SN74HC393DTE4** is a high-speed CMOS device produced by Texas Instruments. It contains **two independent 4-bit binary counters** (dual 4-stage ripple counters) in a single package. --- ### 1. Key Technical Specifications Below are the primary electrical and physical characteristics of the component: | Feature | Specification | | :--- | :--- | | **Logic Family** | HC (High-Speed CMOS) | | **Function** | Dual 4-Bit Binary Counter | | **Operating Voltage (Vcc)** | 2.0V to 6.0V | | **Package / Case** | SOIC-14 | | **Max Frequency (at 6V)** | ~36 MHz | | **Propagation Delay** | 15 ns to 28 ns (Typical at 4.5V) | | **Output Current** | ±4.0 mA | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Functional Description The device consists of two separate sections (Counter A and Counter B). Each counter is triggered by a **Negative-Edge** clock input ($ \overline{CP} $). * **Ripple Counter Architecture:** Because it is a ripple counter, the flip-flops are connected in a chain. The output of one stage serves as the clock for the next. This can lead to small delays (glitches) during transitions, which is important to consider in high-speed synchronous designs. * **Clear (CLR) Function:** Each counter has an asynchronous Master Reset (high-level active). When the CLR pin is pulled high, all four bits of that specific counter are reset to zero ($0000$), regardless of the clock state. --- ### 3. Pin Configuration The SN74HC393DTE4 uses a 14-pin layout: | Pin Number | Name | Description | | :--- | :--- | :--- | | 1 | 1CP | Clock Input, Counter 1 (Active Low) | | 2 | 1CLR | Clear Input, Counter 1 (Active High) | | 3, 4, 5, 6 | 1QA - 1QD | Outputs, Counter 1 | | 7 | GND | Ground | | 8, 9, 10, 11 | 2QD - 2QA | Outputs, Counter 2 | | 12 | 2CLR | Clear Input, Counter 2 (Active High) | | 13 | 2CP | Clock Input, Counter 2 (Active Low) | | 14 | Vcc | Supply Voltage | --- ### 4. Typical Applications * **Frequency Division:** Dividing a high-frequency clock signal down to lower frequencies (e.g., creating a 1Hz pulse from a higher oscillator). * **Time-Delay Generation:** Creating specific wait states in digital logic. * **Digital Integration:** Counting events or pulses in automation systems. --- ### 5. Decoding the Part Number The suffix **DTE4** provides specific info about packaging and environmental standards: * **SN74HC393**: The core logic ID (74 series, High-speed CMOS, 393 dual counter). * **D**: Package type (SOIC/Small Outline Integrated Circuit). * **T**: Tape and Reel (small quantity/partial reel). * **E4**: Lead-free (RoHS compliant) and "Green" (NiPdAu lead finish).