High-Speed, Low-Voltage, CMOS Analog
Multiplexers/Switches
Pin Description
PIN
NAME
FUNCTION
MAX4617
MAX4618
MAX4619
13, 14, 15,
12, 1, 5, 2, 4
—
—
X0–X7
Analog Switch Inputs 0–7
Analog Switch Output
Analog Switch “X” Inputs 0–3
Analog Switch “X” Output
Analog Switch “X” Normally Open Input
Analog Switch “X” Normally Closed Input
Analog Switch “Y” Normally Open Input
Analog Switch “Y” Normally Closed Input
3
—
—
—
14
13
12
1
X
—
—
—
—
—
—
12, 14, 15, 11
X0, X1, X2, X3
13
—
—
—
—
X
X1
X0
Y1
Y0
2
Digital Enable Input. Normally connect to GND. Can be driven
to logic high to set all switches off.
6
6
6
ENABLE
7
8
7
8
7
8
N.C.
GND
No Connection. Not Internally connected.
Ground
11
10
9
10
9
—
11
10
9
A
B
C
Digital Address “A” Input
Digital Address “B” Input
Digital Address “C” Input
—
—
—
—
—
16
1, 5, 2, 4
3
—
15
5
3
4
Y0, Y1, Y2, Y3
Analog Switch “Y” Inputs 0–3
Analog Switch “Y” Output
Analog Switch “Z” Normally Closed Input
Analog Switch “Z” Normally Open Input
Analog Switch “Z” Output
Y
Z0
Z1
Z
—
—
—
16
78/MAX4619
16
V
CC
Positive Analog and Digital Supply Voltage Input
Note: Input and output pins are identical and interchangeable. Any may be considered an input or output; signals pass equally well
in both directions.
Virtually all the analog leakage current comes from the
__________Applications Information
ESD diodes. Although the ESD diodes on a given signal
Power-Supply Considerations
pin are identical and therefore fairly well balanced, they
are reverse biased differently. Each is biased by either
Overview
The MAX4617/MAX4618/MAX4619 construction is typi-
cal of most CMOS analog switches. They have two sup-
V
or GND and the analog signal. This means their
CC
leakages will vary as the signal varies. The difference in
the two diode leakages to the V and GND pins con-
CC
ply pins: V
and GND. V
and GND are used to drive
CC
CC
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.
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-
signal pin and both V
and GND. If any analog signal
CC
exceeds V
or GND, one of these diodes conducts.
CC
During normal operation, these and other reverse-
biased ESD diodes leak, forming the only current drawn
V
and GND power the internal logic and set the input
CC
logic limits. Logic inputs have ESD-protection diodes to
ground.
from V
or GND.
CC
8
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