The SN74CB3Q3306A 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 SN74CB3Q3306A provides an optimized interface solution ideally suited for broadband communications, networking, and data-intensive computing systems.
The SN74CB3Q3306A is organized as two 1-bit switches with separate output-enable (1OE, 2OE) inputs. It can be used as two 1-bit bus switches or as one 2-bit bus switch. When OE is low, the associated 1-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 1-bit 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 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.
(1) For additional information regarding the performance characteristics of the CB3Q family, refer to the TI application report, CBT-C, CB3T, and CB3Q Signal-Switch Families, literature number SCDA008.
|Part number||Order||Configuration||Number of channels (#)||Power supply type||Vdd (Min) (V)||Vdd (Max) (V)||Ron (Typ) (Ohms)||Bandwidth (MHz)||Rating||Operating temperature range (C)||Package Group||Supply range (Max)||Ron (Max) (Ohms)||Input/output continuous current (Max) (mA)||Supply current (Typ) (uA)||Supply current (Max) (uA)||Features||OFF-state leakage current (Max) (µA)||ON-state leakage current (Max) (µA)||CON (Typ) (pF)||COFF (Typ) (pF)||ESD CDM (kV)||ESD HBM (kV)||VIL (Max) (V)||VIH (Min) (V)|
||1:1 SPST||2||Single||2.3||3.6||4||500||Catalog||-40 to 85||
TSSOP | 8
VSSOP | 8
Supports I2C signals
Supports input voltage beyond supply
||1:1 SPST||2||Single||4||5.5||5||200||Catalog||-40 to 85||
SOIC | 8
TSSOP | 8
|5.5||20||128||3||Supports I2C signals||1||1||4||0.8||2|