ISL43120_15 Datasheet, PDF (9/13 Pages) Intersil Corporation – Low-Voltage, Single Supply, Dual SPST Analog Switches

ISL43120, ISL43121, ISL43122
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°C, unless otherwise specified.
40
35
30
+85°C
25
20
15
+25°C
-40°C
10
5
3 4 5 6 7 8 9 10 11 12 13
V+ (V)
45
40
35
30
25
20
15
30
25
20
15
10
20
15
+85°C
+85°C
+25°C
-40°C
+25°C
+85°C
+25°C
-40°C
10
5 ^-40°C
0
2
4
6
8
V_COM (V)
V+ = 3.3V
V+ = 5V
V+ = 12V
10
12
FIGURE 9. ON-RESISTANCE vs SUPPLY VOLTAGE
FIGURE 10. ON-RESISTANCE vs SWITCH VOLTAGE
0.50
0.40
0.30
+25°C
0.20
0.10
+85°C
0
-40°C
0.25
0.20
0.15
+25°C
+85°C
0.10 _+85°C
0.05
0
-40°C
0.15
0.10
-40°C
0.05
+85°C
+25°C
0
0
2
4
6
V_COM (V)
V+ = 3.3V
V+ = 5V
V+ = 12V
-40°C
8
10
+25°C
12
FIGURE 11. r_ON MATCH vs SWITCH VOLTAGE
60
50
40
30
20
10
V+ = 3.3V
0
V+ = 5V
V+ = 12V
-10
-20
0
2
4
6
8
10
12
V_COM (V)
FIGURE 12. CHARGE INJECTION vs SWITCH VOLTAGE
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9
FN6033.6
August 17, 2015