AAT4290/91
I/O Expander Load Switches with Serial Control
Pin Descriptions
Pin #
AAT4290
AAT4291
Symbol
IN
OUT2
OUT1
EN/SET
Function
Input power supply is connected to the P-channel MOSFET
sources. Connect a 1µF capacitor from IN to GND.
P-channel MOSFET drain.
P-channel MOSFET drain.
Input control pin using S
2
Cwire serial interface. The device
records rising edges of the clock and decodes them into 32
states (8 states for AAT4291) which controls the ON/OFF
states of the MOSFETs. See Table 1 and Table 2 for out-
put settings.
Ground connection.
P-channel MOSFET drain.
P-channel MOSFET drain.
P-channel MOSFET drain.
Not connected.
1
2
3
4
1
7
6
4
5
6
7
8
N/A
5
N/A
N/A
8
2, 3
GND
OUT5
OUT4
OUT3
N/C
Pin Configuration
AAT4290
SC70JW-8
(Top View)
IN
OUT2
OUT1
EN/SET
1
2
3
4
8
7
6
5
AAT4291
SC70JW-8
(Top View)
OUT3
OUT4
OUT5
GND
IN
N/C
N/C
EN/SET
1
2
3
4
8
7
6
5
OUT3
OUT2
OUT1
GND
2
4290.2006.03.1.2
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
