## Technical Overview: AM25LS374ADM The **AM25LS374ADM** is a high-performance, Octal D-Type Edge-Triggered Flip-Flop with 3-state outputs. It belongs to the Advanced Low-Power Schottky (ALS/LS) family, originally manufactured by Advanced Micro Devices (AMD). --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Logic Family** | LS (Low-Power Schottky) | | **Function** | Octal D-Type Flip-Flop | | **Package Type** | CDIP (Ceramic Dual In-line Package) - "D" suffix | | **Operating Grade** | Military Grade ("M" suffix) | | **Temperature Range** | -55°C to +125°C | | **Voltage Supply (Vcc)** | 4.5V to 5.5V | | **Output Type** | 3-State (Non-inverting) | --- ### 2. Functional Description The device consists of eight edge-triggered D-type flip-flops. On the positive transition of the clock (CP), the $Q$ outputs are set to the logic states that were set up at the $D$ inputs. #### Pin Configuration Highlights * **$D_0$ - $D_7$:** Data inputs. * **$Q_0$ - $Q_7$:** 3-State non-inverting outputs. * **CP (Clock Pulse):** The clock input; data is transferred on the rising edge. * **$\overline{OE}$ (Output Enable):** When LOW, outputs are active. When HIGH, outputs enter a high-impedance state (Hi-Z), allowing for bus-oriented applications. --- ### 3. Logic Truth Table | Mode | $\overline{OE}$ | CP | $D_n$ | $Q_n$ | | :--- | :---: | :---: | :---: | :---: | | **Load Data** | L | $\uparrow$ | H | H | | **Load Data** | L | $\uparrow$ | L | L | | **Hold** | L | L/H | X | $Q_0$ | | **High-Z** | H | X | X | Z | *Key: L = Low, H = High, X = Don't Care, $\uparrow$ = Rising Edge, Z = High Impedance.* --- ### 4. Distinctive Features 1. **High Drive Capability:** Designed specifically to drive high-capacitance or low-impedance loads (like system buses). 2. **Hysteresis at Inputs:** Includes built-in hysteresis to improve noise margin. 3. **Military Grade (M-Suffix):** The "ADM" suffix indicates it is housed in a ceramic package and tested to withstand extreme military temperature ranges and rigorous reliability standards. 4. **Glitch-Free Power Up:** Outputs are designed to remain in a high-impedance state during power-up/down if $\overline{OE}$ is tied to $V_{cc}$ through a resistor. --- ### 5. Common Applications * **Buffer Registers:** Temporary storage for data moving between a processor and a bus. * **I/O Ports:** Acting as an interface for bidirectional data flow. * **Bidirectional Bus Drivers:** Managing data traffic in complex computing architectures. ---