Low-Voltage, 8-Channel/Dual 4-Channel

Multiplexers with Latchable Inputs

______________________________________________________________________________________

11

DECODERS / DRIVERS

COMA

NO1A

NO2A

NO3A

NO4A

V+

V-

GND

COMB

NO1B

NO2B

NO3B

NO4B

DECODERS / DRIVERS

LATCHES

COM

NO1

NO2

NO3

NO4

NO5

NO6

NO7

NO8

WR

A1

A2

A0

EN

V+

V-

GND

RS

MAX384 DIFFERENTIAL 4-CHANNEL MULTIPLEXER

MAX382 8-CHANNEL SINGLE-ENDED MULTIPLEXER

LATCHES

WR

A1

A0

EN

RS

A1

A0

EN

ON SWITCH

Maintains previous

switch condition

NONE

(latches cleared)

NONE

1

2

3

4

X

0

0

1

1

X

0

1

0

1

0

1

1

1

1

0

0

0

0

0

1

1

1

1

1

XXX

1

XXXX

0

WR

RS

Latching

Reset

Transparent Operation

A1

A2

A0

EN

ON SWITCH

Maintains previous

switch condition

NONE

(latches cleared)

NONE

1

2

3

4

5

6

7

8

X

0

0

1

1

0

0

1

1

X

0

0

0

0

1

1

1

1

X

0

1

0

1

0

1

0

1

0

1

1

1

1

1

1

1

1

0

0

0

0

0

0

0

0

0

1

1

1

1

1

1

1

1

1

X

XX

X

1

X

X

XXX

0

WR

RS

Latching

Reset

Transparent Operation

__________________________________________Functional Diagrams/Truth Tables

COM

V-

V+

NO

* INTERNAL PROTECTION DIODES

D2

D1

-5V

+5V

MAX382

MAX384

*

*

*

*

Figure 8. Overvoltage Protection Using External Blocking Diodes