The SN74CB3Q3244 is a high-bandwidth FET bus switch using 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 SN74CB3Q3244 provides an optimized interface design for broadband communications, networking, and data-intensive computing systems.
The SN74CB3Q3244 is organized as two 4-bit bus switches with separate output-enable (1 OE, 2 OE) inputs. The device can be used as two 4-bit bus switches or as one 8-bit bus switch. When OE is low, the associated 4-bit bus switch is ON, and the A port is connected to the B port, allowing bidirectional data flow between ports. When OE is high, the associated 4-bit bus switch is OFF, and the 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 make sure of the high-impedance state during power up or power down, OE must be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | SN74CB3Q3244 8-Bit FET Bus Switch, 2.5V – 3.3V Low-Voltage, High-Bandwidth Bus Switch datasheet (Rev. C) | PDF | HTML | Aug 21, 2026 |
| Application note | Selecting the Correct Texas Instruments Signal Switch (Rev. E) | PDF | HTML | Jun 2, 2022 | |
| Application note | Multiplexers and Signal Switches Glossary (Rev. B) | PDF | HTML | Dec 1, 2021 | |
| Application brief | Eliminate Power Sequencing with Powered-off Protection Signal Switches (Rev. C) | PDF | HTML | Jan 6, 2021 |
For additional terms or required resources, click any title below to view the detail page where available.
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| TVSOP (DGV) | 20 | Ultra Librarian |
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| VQFN (RGY) | 20 | Ultra Librarian |
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