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MC33064SN-5T1 Datasheet(PDF) 4 Page - ON Semiconductor

No. de pieza MC33064SN-5T1
Descripción Electrónicos  Undervoltage Sensing Circuit
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Fabricante Electrónico  ONSEMI [ON Semiconductor]
Página de inicio  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

MC33064SN-5T1 Datasheet(HTML) 4 Page - ON Semiconductor

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MC34064, MC33064, NCV33064
http://onsemi.com
4
Figure 8. Clamp Diode Forward Current versus Voltage
Figure 9. Low Voltage Microprocessor Reset
Figure 10. Low Voltage Microprocessor Reset with Additional Hysteresis
80
60
40
20
0
0
0.4
0.8
1.2
1.6
VF , FORWARD VOLTAGE (V)
Vin = 0 V
TA = 25°C
A time delayed reset can be accomplished with the
addition of CDLY. For systems with extremely fast
power supply rise times (<500 ns) it is recommended
that the RCDLY time constant be greater than 5.0 ms.
Vth(MPU) is the microprocessor reset input threshold.
tDLY = RCDLY In
1
1 -
Vth(MPU)
Power
Supply
+
-
Input
R
Reset
CDLY
Microprocessor
Circuit
1.2 Vref
GND
-
+
Power
Supply
+
-
Input
RL
Reset
Microprocessor
Circuit
1.2Vref
GND
-
+
VH
4.6 RH
+ 0.02
DVth(lower) ≈ 340 RH x 10-6
Where:RH ≤ 150 W
Where: RL ≥ 1.5 W, ≤ 10 kW
Comparator hysteresis can be increased with the addition of resistor RH. The hysteresis equation has been
simplified and does not account for the change of input current Iin as VCC crosses the comparator threshold
(Figure 4). An increase of the lower threshold
DVth(lower) will be observed due to Iin which is typically 340 mA at
4.59V. The equations are accurate to
±10% with RH less than 150 W and RL between 1.5 kW and 10 kW.
Iin
RH
Vin
RL
TEST DATA
VH
(mV)
DVth
(mV)
RH
(W)
RL
(kW)
20
51
40
81
71
112
100
164
190
327
276
480
0
3.4
6.8
6.8
10
10
16
16
34
34
51
51
0
10
20
20
30
30
47
47
100
100
150
150
0
1.5
4.7
1.5
2.7
1.5
2.7
1.5
2.7
1.5
2.7
1.5


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