AAT4290(2005) Ver la hoja de datos (PDF) - Advanced Analogic Technologies

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AAT4290
(Rev.:2005)

I/O Expander Load Switches with Serial Control

Advanced Analogic Technologies 

AAT4290/4291

I/O Expander Load Switches with Serial Control

Timing Diagram

OUTn

EN/SET

THI TLO

TLAT

TD(ON) TR

TO

TD(OFF)

Output Sequencing

If output sequencing is not necessary, then all of the

outputs will be switched on simultaneously on the

first rising edge of the EN/SET pin. However, if out-

put sequencing is desired, then a series of pulses

on the EN/SET pin will accomplish this. Each time

a new group of pulses is asserted on EN/SET, the

AAT4290/1 internal control is reset. For example, to

sequence the outputs in order from OUT5 to OUT1,

five clocks bursts are input on the EN/SET pin.

From Table 1, the first burst of 16 clocks turns on

OUT5. A following burst of 8 clocks (as the counter

resets) will add OUT4, followed by 4 clocks to add

OUT3, 2 clocks to add OUT2, and 1 clock to add

OUT1. Likewise, the outputs can be turned off in

any order by adding more clock bursts.

10

4290.2005.01.1.0

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