SN74CBT3305C_15 Datasheet, PDF (2/16 Pages) Texas Instruments – DUAL FET BUS SWITCH 5-V BUS SWITCH WITH –2-V UNDERSHOOT PROTECTION

SN74CBT3305C
DUAL FET BUS SWITCH
5-V BUS SWITCH WITH –2-V UNDERSHOOT PROTECTION
SCDS125B – SEPTEMBER 2003 – REVISED AUGUST 2005
www.ti.com
DESCRIPTION/ORDERING INFORMATION (CONTINUED)
This device is fully specified for partial-power-down application using I_off. The I_off 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, 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.
INPUT
OE
H
L
FUNCTION TABLE
(EACH BUS SWITCH)
INPUT/OUTPUT
A
B
Z
FUNCTION
A port = B port
Disconnect
LOGIC DIAGRAM (POSITIVE LOGIC)
2
1A
1
1OE
3
SW
1B
5
2A
7
2OE
6
SW
2B
SIMPLIFIED SCHEMATIC, EACH FET SWITCH (SW)
A
B
Undershoot-
Protection Circuit
EN⁽¹⁾
(1) _{EN is the internal enable signal applied to the switch.}
2