DUAL D-TYPE POSITIVE EDGE-TRIGGERED FLIP-FLOP The SN54LS74 is a dual D-type positive-edge-triggered flip-flop manufactured by Texas Instruments (TI). Below are its key specifications, descriptions, and features:
### **Specifications:**
- **Logic Family:** LS (Low-Power Schottky)
- **Supply Voltage (VCC):** 4.5V to 5.5V (SN54 series, military-grade)
- **Operating Temperature Range:** -55°C to +125°C
- **Propagation Delay (Typical):** 20 ns (CLK to Q)
- **Power Dissipation (Per Flip-Flop):** 20 mW (typical)
- **Input Current (Max):** 0.36 mA (High), 3.6 mA (Low)
- **Output Current (Max):** 8 mA (High), 24 mA (Low)
### **Descriptions:**
- **Function:** Dual D-type flip-flop with individual data (D), clock (CLK), preset (PRE), and clear (CLR) inputs.
- **Triggering:** Positive-edge-triggered (output changes on the rising edge of the clock).
- **Asynchronous Inputs:** Active-low preset (PRE) and clear (CLR) override clock and data inputs.
- **Package Options:** Ceramic dual-in-line (DIP) package (military-grade).
### **Features:**
- **Dual Flip-Flop:** Contains two independent flip-flops in one package.
- **Edge-Triggered Operation:** Ensures stable output transitions only at clock edges.
- **Asynchronous Reset/Sett:** Direct preset and clear control for initialization.
- **Wide Operating Temperature:** Suitable for harsh environments.
- **Schottky Technology:** Provides high speed with low power consumption.
This information is based on TI's official documentation for the SN54LS74. For detailed electrical characteristics and timing diagrams, refer to the datasheet.
