SN74CBT3253CDR

The SN74CBT3253C is a high-speed TTL-compatible FET multiplexer/demultiplexer with low ON-state resistance (r; ), allowing for minimal propagation delay. Active Undershoot-Protection Circuitry on the A and B ports of the SN74CBT3253C 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 SN74CBT3253C is organized as two 1-of-4 multiplexer/demultiplexers with separate output-enable (1; 2; ) inputs. The select (S0, S1) inputs control the data path of each multiplexer/demultiplexer. When; is low, the associated multiplexer/demultiplexer is enabled, and the A port is connected to the B port, allowing bidirectional data flow between ports. When; is high, the associated 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 I; The I; feature ensures that damaging current will not 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, should be tied to V; through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.