The **AM25LS534XC** is a high-speed, low-power Schottky (LS) integrated circuit, specifically classified as an **Octal D-type edge-triggered flip-flop** with three-state (3-state) outputs. It is part of the Advanced Micro Devices (AMD) 25LS series, designed for high-performance bus-oriented applications. --- ### 1. Key Technical Specifications The device consists of eight flip-flops that share a common clock and output-enable control. | Parameter | Specification | |:---|:---| | **Logic Family** | Low-power Schottky (LS) | | **Function** | Octal D-Type Flip-Flop | | **Output Type** | 3-State (Tri-state) | | **Output Polarity** | Inverting (Complementary) | | **Operating Voltage** | 4.75V to 5.25V (Standard 5V TTL) | | **Package Type** | Typically 20-pin DIP or PLCC | | **Data Flow** | D-type input to $\bar{Q}$ output | --- ### 2. Functional Description The AM25LS534XC differs from standard registers primarily through its **inverting outputs**. * **Clock (CP):** On the positive-going transition (rising edge) of the clock, the information at the **D** inputs is stored in the flip-flops and transferred to the outputs in an inverted state ($\bar{Q}$). * **Output Enable ($\bar{OE}$):** This pin controls the 3-state outputs. * When $\bar{OE}$ is **Low**, the data is present on the bus. * When $\bar{OE}$ is **High**, the outputs are in a high-impedance state (disconnected), allowing other devices to use the bus. * **Inversion:** Unlike the AM25LS374 (non-inverting), the AM25LS534 provides the logical complement of the input data. --- ### 3. Pinout Configuration A typical 20-pin layout for this device follows this structure: | Pin Number | Name | Function | |:---:|:---|:---| | 1 | $\bar{OE}$ | Output Enable (Active Low) | | 2-9 | D0 - D7 | Data Inputs | | 10 | GND | Ground | | 11 | CP | Clock Pulse (Active High Edge) | | 12-19 | $\bar{O}7$ - $\bar{O}0$ | Inverting Outputs | | 20 | VCC | Supply Voltage (+5V) | --- ### 4. Applications Due to its high-speed switching and 3-state capabilities, the AM25LS534XC is used in: 1. **Microprocessor Buffers:** Interfacing memory to data buses. 2. **Bus Drivers:** Driving heavily loaded system buses. 3. **Data Registers:** Temporary storage of inverted binary data. 4. **Signal Conditioning:** Inverting logic levels while synchronizing with a system clock. --- ### 5. Logic Comparison To understand its place in a design, compare it with its siblings: * **AM25LS374:** Octal Register, Non-inverting. * **AM25LS534:** Octal Register, **Inverting**.