The **AM25LS534DC** is a high-performance, low-power Schottky (LS) integrated circuit. Specifically, it is an **Octal D-Type Flip-Flop** featuring three-state (3-state) outputs and an inverting configuration. --- ### 1. General Specifications The device is designed for use in computer bus architectures where high speed and the ability to drive bus lines are required. | Feature | Specification | | :--- | :--- | | **Logic Family** | Low-Power Schottky (LS) | | **Function** | Octal D-Type Edge-Triggered Flip-Flop | | **Output Type** | 3-State (Inverting) | | **Package Type** | CDIP (Ceramic Dual In-Line Package) | | **Pin Count** | 20 Pins | | **Operating Voltage** | 4.75V to 5.25V (Standard 5V TTL) | --- ### 2. Key Internal Components & Logic The "534" series is distinct from the "374" series because of its **inverting** nature. * **D-Type Flip-Flops:** It contains eight individual flip-flops that capture data on the low-to-high (positive) transition of the clock (CP). * **Inverting Outputs ($\bar{Q}$):** Unlike the standard 374 which outputs the same logic as the input, the 534 outputs the **complement** of the stored data. * **3-State Control:** It features an Output Enable ($\overline{OE}$) pin. When $\overline{OE}$ is LOW, the data is present on the bus. When HIGH, the outputs are in a high-impedance state (Hi-Z), effectively disconnecting the chip from the bus. --- ### 3. Pinout Configuration The 20-pin layout is optimized for PCB routing (inputs on one side, outputs on the other). | Pin Number | Symbol | Description | | :--- | :--- | :--- | | 1 | $\overline{OE}$ | Output Enable (Active Low) | | 2 - 9 | $D_0 - D_7$ | Data Inputs | | 10 | GND | Ground | | 11 | CP | Clock Pulse (Triggered on Rising Edge) | | 12 - 19 | $\bar{O}_7 - \bar{O}_0$ | Inverting Data Outputs | | 20 | $V_{CC}$ | Supply Voltage (+5V) | --- ### 4. Logic Function Table | $\overline{OE}$ | CP | $D_n$ | Output $\bar{O}_n$ | | :---: | :---: | :---: | :---: | | L | $\uparrow$ | H | L | | L | $\uparrow$ | L | H | | L | L/H | X | No Change | | H | X | X | High Impedance (Z) | --- ### 5. Applications * **Buffer Registers:** Used to hold data temporarily between a processor and a peripheral. * **I/O Ports:** Ideal for driving system buses due to the 3-state outputs. * **Memory Interfacing:** Acting as an address latch or data buffer in 8-bit microcomputer systems.