SN74CBT3383CPWR datasheet(2/15 Pages) TI

2 / 15 page

SN74CBT3383C

10BIT FET BUSEXCHANGE SWITCH

5V BUS SWITCH WITH -2V UNDERSHOOT PROTECTION

SCDS175 − SEPTEMBER 2004

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

description/ordering information (continued)

The SN74CBT3383C is a high-speed TTL-compatible FET bus-exchange switch with low ON-state resistance

(ron), allowing for minimal propagation delay. Active Undershoot-Protection Circuitry on the A and B ports of the

SN74CBT3383C 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 SN74CBT3383C is organized as a 10-bit bus switch, or as a 5-bit bus-exchange switch with a single

output-enable (BE) input that provides data exchanging between four signal ports. The select (BX) input controls

the data path of the bus-exchange switch. When BE is low, the A port is connected to the B port, allowing

bidirectional data flow between ports. When BE is high, 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 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, BE 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.

FUNCTION TABLE

(each 5-bit bus-exchange)

INPUTS

INPUTS/OUTPUTS

FUNCTION

1A1−5A1

1A2−5A2

FUNCTION

1B1−5B1

1B2−5B2

A1 port = B1 port,

A2 port = B2 port

1B2−5B2

1B1−5B1

A1 port = B2 port,

A2 port = B1 port

Disconnect

SN74CBT3383CPWR Datasheet(PDF) 2 Page - Texas Instruments