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MC33064DM-5R2 View Datasheet(PDF) - ON Semiconductor

Part NameDescriptionManufacturer
MC33064DM-5R2 Undervoltage Sensing Circuit ON-Semiconductor
ON Semiconductor ON-Semiconductor
MC33064DM-5R2 Datasheet PDF : 12 Pages
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MC34064, MC33064, NCV33064
80
Vin = 0 V
TA = 25°C
60
40
20
0
0
0.4
0.8
1.2
1.6
VF , FORWARD VOLTAGE (V)
Figure 8. Clamp Diode Forward Current versus Voltage
+
Power
Supply
2 (2)
R
Reset
1 (1)
CDLY
Microprocessor
Circuit
+
1.2 Vref
3 (4)
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.
1
tDLY = RCDLY In
1 − Vth(MPU)
Vin
Figure 9. Low Voltage Microprocessor Reset
+
Power
Supply
RH
Iin
2 (2)
+
1.2Vref
3 (4)
RL
1 (1)
Reset
Microprocessor
Circuit
VH
4.6 RH
RL
+ 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
4.59 V. The equations are accurate to ±10% with RH less than 150 W and RL between 1.5 kW and 10 kW .
TEST DATA
VH
(mV)
20
51
40
81
71
112
100
164
190
327
276
480
DVth
(mV)
0
3.4
6.8
6.8
10
10
16
16
34
34
51
51
RH
RL
(W) (kW)
0
0
10 1.5
20 4.7
20 1.5
30 2.7
30 1.5
47 2.7
47 1.5
100 2.7
100 1.5
150 2.7
150 1.5
Figure 10. Low Voltage Microprocessor Reset with Additional Hysteresis
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