The **74ABT373CMSAMX** is a high-performance electronic component belonging to the **Advanced BiCMOS (ABT)** technology family. It is an octal transparent latch with 3-state outputs, commonly used for data buffering and memory interfacing. --- ### 1. General Specifications The part number can be broken down to understand its characteristics: * **74**: Standard commercial temperature range. * **ABT**: Advanced BiCMOS Technology (combines the speed of CMOS with the drive capability of Bipolar). * **373**: Function code for an Octal Transparent D-Type Latch. * **CMSAMX**: Packaging code (typically referring to SSOP - Shrink Small Outline Package). ### 2. Technical Data Table | Feature | Specification | | :--- | :--- | | **Logic Family** | ABT (Advanced BiCMOS) | | **Logic Type** | Transparent D-Type Latch | | **Number of Channels** | 8-Bit (Octal) | | **Supply Voltage (Vcc)** | 4.5V to 5.5V | | **Output Current** | High (32mA Source / 64mA Sink) | | **Propagation Delay** | ~3.3 ns (Typical) | | **Package** | SSOP-20 (Shrink Small Outline Package) | | **Output Type** | 3-State (Tri-state) | --- ### 3. Key Pins and Functions The device operates based on two primary control inputs: * **Latch Enable (LE):** * When **High**, the Q outputs follow the D inputs (Transparent mode). * When **Low**, the data present at the inputs is "latched" and held at the outputs regardless of further input changes. * **Output Enable ($\overline{OE}$):** * When **Low**, the outputs are active. * When **High**, the outputs are placed in a high-impedance state (High-Z), effectively disconnecting the device from the bus. ### 4. Functional Logic Block ```mermaid graph LR D[8 Data Inputs] --> L[Latch Storage] LE[Latch Enable] --> L L --> O[3-State Buffers] OE[Output Enable] --> O O --> Q[8 Data Outputs] ``` ### 5. Common Applications 1. **Address Latches:** Used in microcontroller systems to de-multiplex address and data lines. 2. **Bus Buffering:** Providing high-drive capability for driving backplanes or long PCB traces. 3. **Digital Isolation:** Using the 3-state functionality to isolate sections of a shared data bus. ---