The **U74CBTLV3251L-R16-R** is a high-performance, low-voltage 8-channel multiplexer/demultiplexer (Mux/Demux) integrated circuit. It is primarily used in high-speed digital systems for signal routing and bus switching. --- ### ## Technical Specifications Overview Below is a breakdown of the core electrical and physical characteristics: | Parameter | Specification | | :--- | :--- | | **Function** | 1-of-8 Mux/Demux Bus Switch | | **Voltage Range ($V_{CC}$)** | 2.3V to 3.6V | | **On-State Resistance ($R_{on}$)** | ~5Ω (Typical at 3.3V) | | **Input Capacitance ($C_{io}$)** | ~10 pF (Switch ON) | | **Propagation Delay** | ≤ 0.25 ns (Max) | | **Operating Temperature** | -40°C to +85°C | | **Package Type** | TSSOP-16 / QFN (R16 designator) | --- ### ## Pin Functionality and Logic The device operates by connecting a common input/output (COM) to one of eight individual ports (B1-B8) based on a 3-bit binary selection code. | Pin Name | Type | Description | | :--- | :--- | :--- | | **S0, S1, S2** | Input | Select inputs (Binary address to choose 1 of 8 channels) | | **/OE** | Input | Output Enable (Active Low). When High, all switches are Open. | | **A (COM)** | I/O | Common signal port | | **B1 - B8** | I/O | Individual signal ports | | **GND / $V_{CC}$** | Power | Ground and Supply Voltage | --- ### ## Key Features 1. **Low ON-Resistance:** The 5-ohm resistance ensures minimal voltage drop and low signal distortion across the switch. 2. **Zero Propagation Delay:** Because it acts as a mechanical-style switch rather than a logic gate, it introduces virtually no timing delay. 3. **Bidirectional Flow:** Signals can pass from A to B or B to A with equal performance. 4. **Off-Isolation:** When the `/OE` pin is High, the ports are in a high-impedance (Hi-Z) state, isolating the circuits completely. --- ### ## Common Applications * **Memory Interfacing:** Switching address or data lines between different memory banks. * **Signal Gating:** Routing high-speed LVTTL or CMOS signals in telecommunications. * **Bus Isolation:** Protecting sensitive components by disconnecting them from the bus when not in use. * **USB/Ethernet Switching:** Routing differential or single-ended communication signals in portable electronics. ---