The **SN74CBT16811CDGGR** is a high-speed FET (Field-Effect Transistor) bus switch manufactured by Texas Instruments. It is designed to facilitate high-speed signal switching and isolation in digital systems without adding significant propagation delay. --- ### 1. General Specifications Below are the primary technical parameters for this specific electronic component: | Feature | Specification | | :--- | :--- | | **Manufacturer** | Texas Instruments | | **Logic Family** | CBT (Cross Bar Technology) | | **Logic Type** | 24-Bit FET Bus Switch | | **Package Type** | TSSOP-56 (Thin Shrink Small Outline Package) | | **Supply Voltage ($V_{CC}$)** | 4.5V to 5.5V | | **Operating Temperature** | -40°C to 85°C | | **Switch Resistance ($R_{on}$)** | ~5 $\Omega$ (Typical) | | **Propagation Delay** | $\leq$ 0.25 ns | --- ### 2. Key Features and Architecture The device consists of 24 independent channels organized into groups. The core technology provides several advantages for digital circuit design: * **Zero Propagation Delay:** Because the device acts as a simple FET switch when enabled, it introduces negligible timing skew or delay to the signal path. * **Low ON-Resistance:** The low resistance ($5 \Omega$) ensures minimal voltage drop across the switch, maintaining signal integrity. * **Undershoot Protection:** The "C" in the part number (CDGGR) indicates enhanced circuitry to handle negative undershoot, preventing the switch from accidentally turning on during signal fluctuations. * **High-Z State:** When disabled, the outputs enter a high-impedance state, effectively isolating different sections of a bus. --- ### 3. Pin Configuration & Functionality The 56-pin TSSOP package is densely packed to support 24 bits of data. * **$A_n$ and $B_n$ Pins:** These are the bidirectional ports. When the switch is enabled, $A$ is connected to $B$. * **OE (Output Enable):** These pins control the state of the switches. Usually, a **Low** signal on the OE pin closes the switch (connects A to B), while a **High** signal opens the switch (isolates them). * **$V_{CC}$ / GND:** Standard power pins (typically 5V logic). --- ### 4. Typical Applications This part is commonly found in complex computing and networking environments: 1. **Memory Interleaving:** Switching between multiple banks of SDRAM or Flash memory. 2. **Bus Isolation:** Protecting a sensitive processor bus from peripheral noise or voltage spikes. 3. **Voltage Level Translation:** When used with a diode or specific $V_{CC}$ settings, it can facilitate communication between 5V and 3.3V logic levels. 4. **Hot-Plugging:** Allowing peripheral cards to be inserted into a backplane without crashing the system bus.