## FST3383MTC: Overview and Technical Specifications The **FST3383MTC** is a high-speed CMOS 10-bit bus switch manufactured by Fairchild Semiconductor (now part of ON Semiconductor). It is primarily used for high-speed switching and voltage translation in digital systems. --- ### 1. General Description The FST3383 provides 10 bits of high-speed CMOS TTL-compatible bus switching. The low ON resistance of the switch allows inputs to be connected to outputs without adding propagation delay or generating additional ground bounce noise. ### 2. Key Specifications The following table highlights the critical electrical characteristics: | Parameter | Specification | | :--- | :--- | | **Logic Family** | FST (Bus Switch) | | **Number of Channels** | 10-Bit | | **Operating Voltage ($V_{CC}$)** | 4.0V to 5.5V | | **ON Resistance ($R_{ON}$)** | 4Ω (Typical) | | **Propagation Delay** | 0.25 ns (Max) | | **Package Type** | TSSOP-24 (MTC Designator) | | **Operating Temperature** | -40°C to +85°C | --- ### 3. Pin Configuration and Functions The device is housed in a 24-pin Thin Shrink Small Outline Package (TSSOP). * **$A_0 - A_9$:** Bus A inputs/outputs. * **$B_0 - B_9$:** Bus B inputs/outputs. * **$\overline{OE}$ (Output Enable):** When LOW, the switches are ON (A connected to B). When HIGH, the switches are in a high-impedance (Hi-Z) state. * **GND / $V_{CC}$:** Power supply pins. --- ### 4. Technical Features 1. **Zero Propagation Delay:** Because it acts as a simple FET switch, it does not add the delay typically associated with buffer logic. 2. **Low Power Consumption:** Uses CMOS technology to ensure minimal static power draw. 3. **Undershoot Protection:** The architecture protects against signal undershoot, which is common in high-speed bus environments. 4. **Voltage Translation:** It can be used for 5V to 3.3V level translation by using a series resistor or by limiting the $V_{CC}$ level. --- ### 5. Common Applications * **Bus Swapping:** Redirecting data between different bus segments. * **Hot-Plugging:** Protecting circuitry during live insertion of cards. * **Memory Interfacing:** High-speed switching between memory banks and CPUs. * **Voltage Level Shifting:** Interfacing components with different logic levels. ---