ISL43640 Intersil Corporation, ISL43640 Datasheet - Page 9

• Manufacturer Part Number: ISL43640
• Description: Low-Voltage/ Single Supply/ 4 to 1 Multiplexer/ High Performance Analog Switch
• Manufacturer: Intersil Corporation

voltage divider action of the switch OFF impedance and the
load impedance.
Leakage Considerations
Reverse ESD protection diodes are internally connected
between each analog-signal pin and both V+ and GND. One of
these diodes conducts if any analog signal exceeds V+ or
GND.
Virtually all the analog leakage current comes from the ESD
diodes to V+ or GND. Although the ESD diodes on a given
signal pin are identical and therefore fairly well balanced,
Typical Performance Curves
FIGURE 10. DIGITAL SWITCHING POINT vs SUPPLY VOLTAGE
3.0
2.5
2.0
1.5
1.0
0.5
3.0
2.5
2.0
1.5
1.0
0.5
FIGURE 8. ON RESISTANCE vs SUPPLY VOLTAGE
500
400
300
200
100
2
0
2
V
V
INH
INL
3
85
-40
3
25
o
o
25
4
C
85
o
C
C
o
4
o
C
C
5
5
6
6
25
o
7
C
V+ (V)
9
7
V+ (V)
8
8
85
9
o
9
C
T
A
10
10
= 25
V
COM
I
COM
11
o
11
-40
C, Unless Otherwise Specified
= (V+) - 1V
= 1mA
o
C
-40
12
12
o
C
13
13
ISL43640
they are reverse biased differently. Each is biased by either
V+ 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+ and GND pins constitutes the analog-
signal-path leakage current. All analog 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 leakage currents of the same or opposite
polarity. There is no connection between the analog signal
paths and V+ or GND.
FIGURE 11. SUPPLY CURRENT vs DIGITAL ADDRESS INPUT
225
200
175
150
125
100
140
120
100
80
60
75
80
70
60
50
40
30
FIGURE 9. ON RESISTANCE vs SWITCH VOLTAGE
70
60
50
40
30
20
10
0
0
85
0
-40
o
o
C
C
0.5
VOLTAGE
2
25
1
o
C
-40
1.5
85
25
4
o
o
o
C
C
C
V
2
V
IN(ADD)
-40
85
25
COM
o
o
o
6
2.5
C
C
C
(V)
(V)
3
8
3.5
V+ = 12V
I
4
COM
10
V+ = +5V
V+ = 3.3V
V+ = 5V
4.5
= 1mA
12
5