The SN74CBT3244C is a high-speed TTL-compatible FET bus switch with low ON-state resistance (ron), allowing for minimal propagation delay. Active Undershoot-Protection Circuitry on the A and B ports of the SN74CBT3244C provides protection for undershoot up to 2 V by sensing an undershoot event and ensuring that the switch remains in the proper OFF state.
The SN74CBT3244C is organized as two 4-bit bus switches with separate output-enable (1OE\, 2OE\) inputs. It 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 feature ensures that damaging current will not backflow through the device when it is powered down.
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)||Power supply type||Vdd (Min) (V)||Vdd (Max) (V)||Rating||Operating temperature range (C)||Package Group||Supply range (Max)||Ron (Max) (Ohms)||Input/output continuous current (Max) (mA)||Supply current (Max) (uA)||Features||OFF-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||8||3||200||Single||4||5.5||Catalog||-40 to 85||
SOIC | 20
SSOP | 20
TSSOP | 20
TVSOP | 20
VQFN | 20