The **54ABT373CMSAMX** is a high-performance, radiation-tolerant octal transparent latch designed for military and aerospace applications. It belongs to the **Advanced BiCMOS Technology (ABT)** family, which combines the high speed of bipolar logic with the low power consumption of CMOS. --- ### 1. General Specifications Below are the primary technical characteristics of the device: | Parameter | Specification | | :--- | :--- | | **Logic Family** | ABT (Advanced BiCMOS) | | **Logic Type** | Octal Transparent D-Type Latch | | **Output Type** | 3-State (Tri-state) | | **Voltage Supply Range** | 4.5V to 5.5V | | **Operating Temperature** | -55°C to +125°C | | **Package Type** | SSOP (Shrink Small Outline Package) | | **Channel Count** | 8-bit | --- ### 2. Functional Description The device consists of eight latches with 3-state outputs designed specifically for driving highly capacitive loads or relatively low-impedance backplanes. #### Key Pins and Operations: * **D0 - D7 (Inputs):** Data input pins. * **LE (Latch Enable):** When High, the outputs follow the data inputs (transparent mode). When Low, the data is latched. * **OE (Output Enable):** When Low, the outputs are active. When High, the outputs are in a high-impedance state (Z), effectively disconnecting them from the bus. * **Q0 - Q7 (Outputs):** The latched data outputs. --- ### 3. Key Technical Features 1. **BiCMOS Technology:** Uses bipolar transistors for high-drive current (high speed) and CMOS for internal logic (low static power). 2. **3-State Outputs:** Allows the device to be connected directly to system buses without interference when not in use. 3. **High Drive Capability:** Typically capable of sinking up to 48mA to 64mA, making it suitable for driving long PCB traces or backplanes. 4. **Power-Up/Down High Impedance:** Specifically designed to stay in a high-impedance state during power-up or power-down to prevent "glitching" on the bus. 5. **Military Grade:** The "54" prefix (as opposed to "74") signifies that it is rated for the full military temperature range and often meets MIL-STD-883 requirements. --- ### 4. Typical Applications * **Buffer/Driver:** Acting as an interface between a CPU and a data bus. * **Memory Address Latching:** Holding address bits for multiplexed memory buses. * **Aerospace & Defense:** Use in flight computers or satellite systems where wide temperature swings and reliability are critical.