ISL43640 Datasheet, PDF (9/13 Pages) Intersil Corporation – Low-Voltage, Single Supply, 4 to 1 Multiplexer, High Performance Analog Switch

ISL43640
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,
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.
Typical Performance Curves T_A = 25^oC, Unless Otherwise Specified
500
V_COM = (V+) - 1V
I_COM = 1mA
400
300
200
85^oC
100
-40^oC
25^oC
0
2 3 4 5 6 7 8 9 10 11 12 13
V+ (V)
FIGURE 8. ON RESISTANCE vs SUPPLY VOLTAGE
225
200
85^oC
175
V+ = 3.3V
I_COM = 1mA
150
25^oC
125
100
-40^oC
75
140
120
85^oC
V+ = 5V
100
25^oC
80
-40^oC
60
80
70 85^oC
25^oC
V+ = 12V
60
50
40 -40^oC
30
0
2
4
6
8
10
12
V_COM (V)
FIGURE 9. ON RESISTANCE vs SWITCH VOLTAGE
3.0
V_INH
2.5
-40^oC
2.0
25^oC
1.5
85^oC
1.0
0.5
3.0
V_INL
2.5
-40^oC
2.0
25^oC
1.5
1.0
85^oC
0.5
2 3 4 5 6 7 8 9 10 11 12 13
V+ (V)
FIGURE 10. DIGITAL SWITCHING POINT vs SUPPLY VOLTAGE
9
70
V+ = +5V
60
50
40
30
20
10
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
V_IN(ADD) (V)
FIGURE 11. SUPPLY CURRENT vs DIGITAL ADDRESS INPUT
VOLTAGE