__________Applications Information

8 x 1 Multiplexer

To use the MAX335 as an 8 x 1 multiplexer, tie all

drains together (COM0 to COM7); the mux inputs now

source each switch (NO0 to NO7). Input a single 0V to

+3V pulse at DIN. As this is clocked through the regis-

ter by SCLK, each switch will sequence on one at a

time.

4-2 Differential Multiplexer

To use the MAX335 as a 4-2 differential multiplexer, tie

COM0 through COM3 together and COM4 through

COM7 together. Differential inputs will be the source

inputs as follows: (NO0, NO4), (NO1, NO5), (NO2,

NO6), (NO3, NO7). Figure 7 shows the serial input con-

trol at DIN required to turn on two switches making a

differential multiplexer.

CS is held low for four clock pulses; the first pulse is

clocked into the fifth switch position as the second

pulse is clocked into the first switch position.

CS is

pulled high to update switches; then

CS is pulled low,

and SCLK advances pulses to S1 and S5 positions,

where

CS is pulled high to update, etc.

SPDT Switches

Tie COM0 to NO1 so that NO0 and COM1 are now

inputs and COM0/NO1 is the common output. SP is

common output. Up to four SPDT switches can be

made from each MAX335. Multiples of four or more can

be made by daisy chaining devices. In Figure 8, DIN is

a pulse train. Again,

CS is held low to clock in pulses

and

CS is pulled high to update; CS is held low to shift

pulses, then pulled high to update, etc.

Reset Function

function. The switches are set to the off position, and

the serial shift register is reset to all zeros.

Power-Supply Operation

The MAX335 operates with V = ±4.5V to ±20V and

V+ = +10V to +30V.

threshold is raised, so the part is no longer TTL com-

patible. The MAX335 also operates with a single power

supply cannot be used as a reset function.

Serial Controlled, 8-Channel SPST Switch

10

______________________________________________________________________________________

1 CLOCK

PULSE

DIN

Figure 8. Serial-Input Control for SPDT Switch

___________________Chip Topography

V-

DIN

GND

NO4

0.156"

(3.96mm)

0.099"

(2.51mm)

NO0

COM0

COM1

NO2

COM2

COM3

NO3

COM4

COM5

NO5

COM6

NO6

COM7

NO7

DOUT

V+

SCLK

CS

VL

NO1

TRANSISTOR COUNT: 387

SUBSTRATE CONNECTED TO V+.

Figure 7. Differential Multiplexer Input Control

4 CLOCK

PULSES

DIN

SCLK

D4

SW4

DØ

SWØ