Datasheet

1A
1OE
SW
1B
2A
2OE
SW
2B
2
1
5
7
3
6
A
EN
(1)
B
(1) EN is the internal enable signal applied to the switch.
Charge
Pump
V
CC
SN74CB3Q3305
SCDS141B –OCTOBER 2003–REVISED OCTOBER 2009 www.ti.com
ORDERING INFORMATION
TOP-SIDE MARKING
T
A
PACKAGE
(1)
ORDERABLE PART NUMBER
(2)
Tube SN74CB3Q3305PW
TSSOP – PW BU305
–40°C to 85°C Tape and reel SN74CB3Q3305PWR
VSSOP – DCU Tape and reel SN74CB3Q3305DCUR GAR_
(1) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
(2) The last character designates assembly/test site.
DESCRIPTION/ORDERING INFORMATION (CONTINUED)
This device is fully specified for partial-power-down applications using I
off
. The I
off
circuitry prevents damaging
current 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.
Table 1. 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)
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Product Folder Link(s): SN74CB3Q3305