The SN74CB3Q3345 is a high-bandwidth FET bus switch utilizing a charge pump to elevate the gate voltage of the pass transistor, providing a low and flat ON-state resistance (ron). The low and flat ON-state resistance allows for minimal propagation delay and supports rail-to-rail switching on the data input/output (I/O) ports. The device also features low data I/O capacitance to minimize capacitive loading and signal distortion on the data bus. Specifically designed to support high-bandwidth applications, the SN74CB3Q3345 provides an optimized interface for broadband communications, networking, and data-intensive computing systems.
The SN74CB3Q3345 is organized as an 8-bit bus switch with two output-enable (OE, OE) inputs. When OE is high or OE is low, the bus switch is ON, and the A port is connected to the B port, allowing bidirectional data flow between ports. When OE is low and OE is high, the bus switch is OFF, and a high-impedance state exists between the A and B ports.
This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry prevents damaging current backflow through the device when powered down.
The device has isolation during power off. To maintain the high-impedance state during power up or power down, OE must be tied to VCC through a pullup resistor and OE must be tied to GND through a pulldown resistor; the minimum value of the resistor is determined by the current-sinking/current-sourcing capability of the driver.
| Documentación principal | Tipo | Título | Opciones de formato | Descargar la versión más reciente en inglés | Fecha |
|---|---|---|---|---|---|
| * | Hoja de datos | SN74CB3Q3345 8-Bit FET BUS Switch 2.5V, 3.3V Low-Voltage High-Bandwidth BUS Switch datasheet (Rev. C) | PDF | HTML | 21/08/2026 | |
| Nota sobre la aplicación | Selecting the Correct Texas Instruments Signal Switch (Rev. E) | PDF | HTML | 2/06/2022 | ||
| Nota sobre la aplicación | Multiplexers and Signal Switches Glossary (Rev. B) | PDF | HTML | 1/12/2021 | ||
| Application brief | Eliminate Power Sequencing with Powered-off Protection Signal Switches (Rev. C) | PDF | HTML | 6/01/2021 |
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| Encapsulado | Pines | Símbolos CAD, huellas y modelos 3D |
|---|---|---|
| VQFN (RGY) | 20 | Ultra Librarian |
| TSSOP (PW) | 20 | Ultra Librarian |
| TVSOP (DGV) | 20 | Ultra Librarian |
| SSOP (DBQ) | 20 | Ultra Librarian |
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