Table 2. MAX350 Serial-Interface Switch Programming

Serially Controlled, Low-Voltage,

8-Channel/Dual 4-Channel Multiplexers

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15

X = Don’t care. Data bit D7 is first bit in; data bit D0 is last in.

X

1

Switch 0 open (off)

X

X

X

X

0

X

X

X

MAX349 FUNCTION

X

X

X

X

1

1

X

DATA BITS

Switch 0 closed to COM

X

0

0

1

0

1

1

1

All switches open, D7–D0 = 0

Switch 7 open (off)

All switches closed to COM, D7–D0 = 1

All switches open, D7–D0 = 0

X

X

1

X

1

X

1

1

1

Switch 6 open (off)

Switch 5 open (off)

Switch 6 closed to COM

Switch 7 closed to COM

X

1

X

1

X

1

X

1

Switch 4 open (off)

Switch 3 open (off)

Switch 4 closed to COM

Switch 5 closed to COM

X

1

X

1

X

1

X

1

Switch 2 open (off)

Switch 1 open (off)

Switch 2 closed to COM

Switch 3 closed to COM

D7

0

X

1

X

0

X

1

X

X

X

X

X

X

X

X

X

D6

0

0

X

X

1

X

1

X

X

X

X

0

X

1

X

X

X

X

X

D4

X

X

0

X

X

X

X

X

1

X

X

X

X

D5

0

0

X

X

1

X

1

X

X

X

X

X

X

X

X

0

X

1

X

D2

0

0

X

X

1

X

1

RESET

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

D0

X

X

X

X

X

X

X

X

X

X

X

0

X

X

D1

X

X

0

X

X

X

X

X

1

D3

X

X

X

X

X

1

X

1

Switch 1 closed to COM

X

Table 1. MAX349 Serial-Interface Switch Programming

X

1

Switch NO0A open (off)

X

X

X

X

0

X

X

X

MAX350 FUNCTION

X

X

X

X

1

1

X

DATA BITS

Switch NO0A closed

X

0

0

1

0

1

1

1

All switches open, D7–D0 = 0

Switch NO0B open (off)

All “A” switches closed to COMA; All “B”

switches closed to COMB, D7–D0 = 1

All switches open, D7–D0 = 0

X

X

1

X

1

X

1

1

1

Switch NO1B open (off)

Switch NO2B open (off)

Switch NO1B closed

Switch NO0B closed

X

1

X

1

X

1

X

1

Switch NO3B open (off)

Switch NO3A open (off)

Switch NO3B closed

Switch NO2B closed

X

1

X

1

X

1

X

1

Switch NO2A open (off)

Switch NO1A open (off)

Switch NO2A closed

Switch NO3A closed

D7

0

X

1

X

0

X

1

X

X

X

X

X

X

X

X

X

D6

0

0

X

X

1

X

1

X

X

X

X

0

X

1

X

X

X

X

X

D4

X

X

0

X

X

X

X

X

1

X

X

X

X

D5

0

0

X

X

1

X

1

X

X

X

X

X

X

X

X

0

X

1

X

D2

0

0

X

X

1

X

1

RESET

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

D0

X

X

X

X

X

X

X

X

X

X

X

0

X

X

D1

X

X

0

X

X

X

X

X

1

D3

X

X

X

X

X

1

X

1

Switch NO1A closed

X