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DESCRIPTION/ORDERING INFORMATION (CONTINUED)

1A

1OE

SW

1B

2A

2OE

SW

2B

2

1

5

7

3

6

A

B

Undershoot-

Protection Circuit

SN74CBT3305C

DUAL FET BUS SWITCH

5-V BUS SWITCH WITH –2-V UNDERSHOOT PROTECTION

SCDS125B – SEPTEMBER 2003 – REVISED AUGUST 2005

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, OE should be tied to GND through a

pulldown resistor; the minimum value of the resistor is determined by the current-sourcing capability of the driver.

FUNCTION TABLE

(EACH BUS SWITCH)

INPUT

INPUT/OUTPUT

FUNCTION

OE

A

H

B

A port = B port

L

Z

Disconnect

LOGIC DIAGRAM (POSITIVE LOGIC)

SIMPLIFIED SCHEMATIC, EACH FET SWITCH (SW)

2