SN74CBT3305C Datasheet, PDF (2/9 Pages) Texas Instruments – DUALFET BUS SWICH 5-V BUS SWITCH -2-V UNDERSHOOT PROTECTION

SN74CBT3305C
DUAL FET BUS SWITCH
5ĆV BUS SWITCH WITH ć2ĆV UNDERSHOOT PROTECTION
SCDS125A − SEPTEMBER 2003 − REVISED OCTOBER 2003
description/ordering information (continued)
This device is fully specified for partial-power-down applications 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
FUNCTION
B
A port = B port
Z
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^†
† _{EN is the internal enable signal applied to the switch.}
2
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