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SI8421AD Datasheet, PDF (12/37 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 3. Electrical Characteristics1
(VDD1 = 2.70 V, VDD2 = 2.70 V, 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
High Level Input Voltage
Low Level Input Voltage
High Level Output Voltage
VHYS
VIH
VIL
VOH
loh = –4 mA
0.40
2.0
—
VDD1,VDD2 – 0.
4
0.45
—
—
2.3
0.50
V
—
V
0.8
V
—
V
Low Level Output Voltage
VOL
lol = 4 mA
—
0.2
0.4
V
Input Leakage Current
IL
Output Impedance2
ZO
—
—
±10
µA
—
50
—

DC Supply Current (All inputs 0 V or at supply)
Si8410Ax, Bx
VDD1
VDD2
VDD1
VDD2
Si8420Ax, Bx
All inputs 0 DC
—
All inputs 0 DC
—
All inputs 1 DC
—
All inputs 1 DC
—
1.0
1.5
mA
1.0
1.5
3.0
4.5
1.0
1.5
VDD1
VDD2
VDD1
VDD2
All inputs 0 DC
—
All inputs 0 DC
—
All inputs 1 DC
—
All inputs 1 DC
—
1.3
2.0
mA
1.7
2.6
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
mA
1.7
2.6
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
mA
3.7
5.6
1.7
2.6
1.7
2.6
Notes:
1. Specifications in this table are also valid at VDD1 = 2.6 V and VDD2 = 2.6 V when the operating temperature range is
constrained to TA = 0 to 85 °C.
2. 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.
3. 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.
4. Start-up time is the time period from the application of power to valid data at the output.
12
Rev. 1.3
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