The SN74CB3Q3251 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 SN74CB3Q3251 provides an optimized interface solution ideally suited for broadband communications, networking, and data-intensive computing systems.
The SN74CB3Q3251 is a 1-of-8 multiplexer/demultiplexer with a single output-enable (OE\) input. The select (S0, S1, S2) inputs control the data path of the multiplexer/demultiplexer. When OE\ is low, the multiplexer/demultiplexer is enabled, and the A port is connected to the B port, allowing bidirectional data flow between ports. When OE\ is high, the multiplexer/demultiplexer is disabled, 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 it is powered down. The device has isolation during power off.
To ensure the high-impedance state during power up or power down, OE\ should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
Part number | Order | Configuration | Number of channels (#) | Ron (Typ) (Ohms) | Bandwidth (MHz) | Rating | Operating temperature range (C) | Package Group | Input/output continuous current (Max) (mA) | Supply current (Typ) (uA) | Features | ON-state leakage current (Max) (µA) | CON (Typ) (pF) |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
SN74CB3Q3251 |
|
8:1 | 1 | 3.5 | 500 | Catalog | -40 to 85 |
SSOP | 16
TSSOP | 16 TVSOP | 16 VQFN | 16 |
64 | 600 |
Powered-off protection
Supports input voltage beyond supply |
15 | |
SN74CBT3251 |
|
8:1 | 1 | 5 | 200 | Catalog | -40 to 85 |
SOIC | 16
SSOP | 16 SSOP | 16 TSSOP | 16 VQFN | 16 |
128 | 1 | |||
SN74CBTLV3251 | Samples not available | 8:1 | 1 | 5 | 200 | Catalog | -40 to 85 |
SOIC | 16
SSOP | 16 TSSOP | 16 TVSOP | 16 VQFN | 16 |
128 | Powered-off protection | 1 |