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SI8421AD Datasheet, PDF (8/37 Pages) List of Unclassifed Manufacturers – LOW-POWER, SINGLE AND DUAL-CHANNEL DIGITAL ISOLATORS
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Si8410/20/21 (5 kV)
Si8422/23 (2.5 & 5 kV)
Table 2. Electrical Characteristics
(VDD1 = 3.3 V ±10%, VDD2 = 3.3 V ±10%, TA = –40 to 125 °C)
Parameter
Symbol Test Condition
Min
Typ
Max Unit
VDD Undervoltage Threshold
VDD Negative-Going Lockout
Hysteresis
VDDUV+ VDD1, VDD2 rising
VDDHYS
2.15
45
2.3
2.5
V
75
95
mV
Positive-Going Input Threshold
VT+ All inputs rising
1.6
—
1.9
V
Negative-Going Input Threshold
VT– All inputs falling
1.1
—
1.4
V
Input Hysteresis
VHYS
0.40
0.45
High Level Input Voltage
VIH
2.0
—
Low Level Input Voltage
VIL
—
—
High Level Output Voltage
VOH
loh = –4 mA VDD1,VDD2 – 0.4 3.1
Low Level Output Voltage
VOL
lol = 4 mA
—
0.2
Input Leakage Current
IL
Output Impedance (Si8410/20)1
ZO
—
—
—
50
DC Supply Current (All inputs 0 V or at supply)
0.50
V
—
V
0.8
V
—
V
0.4
V
±10
µA
—

Si8410Ax, Bx
VDD1
VDD2
VDD1
VDD2
All inputs 0 DC
—
All inputs 0 DC
—
All inputs 1 DC
—
All inputs 1 DC
—
1.0
1.5
1.0
1.5
mA
3.0
4.5
1.0
1.5
Si8420Ax, Bx
VDD1
VDD2
VDD1
VDD2
All inputs 0 DC
—
All inputs 0 DC
—
All inputs 1 DC
—
All inputs 1 DC
—
1.3
2.0
1.7
2.6
mA
5.8
8.7
1.7
2.6
Si8421Ax, Bx
VDD1
VDD2
VDD1
VDD2
All inputs 0 DC
—
All inputs 0 DC
—
All inputs 1 DC
—
All inputs 1 DC
—
1.7
2.6
1.7
2.6
mA
3.7
5.6
3.7
5.6
Si8422Ax, Bx
VDD1
VDD2
VDD1
VDD2
All inputs 0 DC
—
All inputs 0 DC
—
All inputs 1 DC
—
All inputs 1 DC
—
3.7
5.6
3.7
5.6
mA
1.7
2.6
1.7
2.6
Si8423Ax, Bx
VDD1
VDD2
VDD1
VDD2
All inputs 0 DC
—
All inputs 0 DC
—
All inputs 1 DC
—
All inputs 1 DC
—
5.4
8.1
1.7
2.6
mA
1.3
2.0
1.7
2.6
Notes:
1. The nominal output impedance of an isolator driver channel is approximately 50 , ±40%, which is a combination of the
value of the on-chip series termination resistor and channel resistance of the output driver FET. When driving loads
where transmission line effects will be a factor, output pins should be appropriately terminated with controlled
impedance PCB traces.
2. tPSK(P-P) is the magnitude of the difference in propagation delay times measured between different units operating at
the same supply voltages, load, and ambient temperature.
3. Start-up time is the time period from the application of power to valid data at the output.
8
Rev. 1.3
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