AAT4290IJS-1-T1 查看數據表（PDF） - Analog Technology Inc

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AAT4290IJS-1-T1

I/O Expander Load Switches with Serial Control

Analog Technology Inc 

AAT4290/91

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

AAT4290/91 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

4290.2006.03.1.2

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