SN74AVC2T872_1 Datasheet, PDF (3/18 Pages) Texas Instruments – VOLTAGE-LEVEL SHIFTER FOR IC-USB INTERFACE

SN74AVC2T872
www.ti.com........................................................................................................................................................................................... SCES710 – NOVEMBER 2008
BALL NO.
A1
A2, B2
A3
B1
B3
C1
C2, D2
C3
D1
D3
NAME
PD_EN
V_CCA
V_CCB
D+(A)
D+(B)
D–(A)
GND
D–(B)
DIR
DIR_POL
TERMINAL FUNCTIONS
FUNCTION
Input to enable pulldown resistors on B-side. PD_EN = Low will disconnect the pulldown resistors.
PD_EN = High will connect the pulldown resistors.
A-side supply voltage (1.1 V to 3.6 V)
B-side supply voltage (1.1 V to 3.6 V)
USB data signal connected to host.
USB data signal connected to peripheral with internal 120 kΩ resistor to GND that can be
disconnected by PD_EN.
USB data signal connected to host.
Ground
USB data signal connected to peripheral with internal 120 kΩ resistor to GND that can be
disconnected by PD_EN.
Direction control input. If DIR_POL = Low, then DIR = Low allows A to B data flow.
If DIR_POL = High, then DIR = High allows A to B data flow.
Direction polarity chooser. If DIR_POL = Low, then DIR = Low allows A to B data flow.
If DIR_POL = High, then DIR = High allows A to B data flow.
INPUTS
DIR_POL
DIR
L
L
L
H
H
L
H
H
FUNCTION TABLE
A-SIDE
Input
Output
Output
Input
B-SIDE
Output
Input
Input
Output
FUNCTION
A-to-B Data Flow
B-to-A Data Flow
B-to-A Data Flow
A-to-B Data Flow
V_CCA
0V
1.1 to 3.6 V
1.1 to 3.6 V
1.1 to 3.6 V
B-SIDE PULLDOWN RESISTOR BEHAVIOR
V_CCB
X
0V
1.1 to 3.6 V
1.1 to 3.6 V
PD_EN
X
X
L
H
PULLDOWN RESISTOR
B-SIDE
None
120 kΩ to GND
None
120 kΩ to GND
Copyright © 2008, Texas Instruments Incorporated
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