Datasheet

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-
ply pins: V
CC
and GND. V
CC
and GND are used to drive
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
CC
and GND. If any analog signal
exceeds V
CC
or GND, one of these diodes conducts.
During normal operation, these and other reverse-
biased ESD diodes leak, forming the only current drawn
from V
CC
or GND.
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
V
CC
or GND and the analog signal. This means their
leakages will vary as the signal varies. The difference in
the two diode leakages to the V
CC
and GND pins con-
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.
V
CC
and GND power the internal logic and set the input
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.
66
No Connection. Not Internally connected.77
Ground88
Digital Address “A” Input1011
Digital Address “B” Input910
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” Output13—
Analog Switch “X” Inputs 0–312, 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 0–31, 5, 2, 4—
Analog Switch “Y” Output3—
ENABLE6
N.C.7
GND8
A11
B10
X113
X012
Y11
Y02
X14
X0, X1, X2, X3—
X—
X0–X7—
NAME
Z05
Z13
Z4
C9
Y0, Y1, Y2, Y3—
Y15
MAX4617
MAX4618 MAX4619
Positive Analog and Digital Supply Voltage Input1616 V
CC
16
PIN
Pin Description