MAX4617/MAX4618/MAX4619

High-Speed, Low-Voltage, CMOS Analog

Multiplexers/Switches

8

Maxim Integrated

__________Applications Information

Power-Supply Considerations

Overview

The MAX4617/MAX4618/MAX4619 construction is typi-

cal of most CMOS analog switches. They have two sup-

the internal CMOS switches and set the limits of the ana-

log voltage on any switch. Reverse ESD-protection

diodes are internally connected between each analog-

During normal operation, these and other reverse-

biased ESD diodes leak, forming the only current drawn

Virtually all the analog leakage current comes from the

ESD diodes. Although the ESD diodes on a given signal

pin are identical and therefore fairly well balanced, they

are reverse biased differently. Each is biased by either

leakages will vary as the signal varies. The

difference in

stitutes the analog-signal-path leakage current. All ana-

log leakage current flows between each pin and one of

the supply terminals, not to the other switch terminal.

This is why both sides of a given switch can show leak-

age currents of either the same or opposite polarity.

logic limits. Logic inputs have ESD-protection diodes to

ground.

Note: Input and output pins are identical and interchangeable. Any may be considered an input or output; signals pass equally well

in both directions.

Digital Enable Input. Normally connect to GND. Can be driven

to logic high to set all switches off.

6

6

No Connection. Not Internally connected.

7

7

Ground

8

8

Digital Address “A” Input

10

11

Digital Address “B” Input

9

10

Analog Switch “X” Normally Open Input

—

—

Analog Switch “X” Normally Closed Input

—

—

Analog Switch “Y” Normally Open Input

—

—

Analog Switch “Y” Normally Closed Input

—

—

Analog Switch “X” Output

13

—

Analog Switch “X” Inputs 0–3

12, 14, 15, 11

—

Analog Switch Output

—

3

Analog Switch Inputs 0–7

—

13, 14, 15,

12, 1, 5, 2, 4

FUNCTION

Analog Switch “Z” Normally Closed Input

—

—

Analog Switch “Z” Normally Open Input

—

—

Analog Switch “Z” Output

—

—

Digital Address “C” Input

—

9

Analog Switch “Y” Inputs 0–3

1, 5, 2, 4

—

Analog Switch “Y” Output

3

—

ENABLE

6

N.C.

7

GND

8

A

11

B

10

X1

13

X0

12

Y1

1

Y0

2

X

14

X0, X1, X2, X3

—

X

—

X0–X7

—

NAME

Z0

5

Z1

3

Z

4

C

9

Y0, Y1, Y2, Y3

—

Y

15

MAX4617

MAX4618

MAX4619

Positive Analog and Digital Supply Voltage Input

16

16

16

PIN

Pin Description