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부품번호 | MC34064 기능 |
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기능 | (MC33064 / MC34064) UNDERVOLTAGE SENSING CIRCUIT | ||
제조업체 | ON Semiconductor | ||
로고 | |||
전체 12 페이지수
MC34064, MC33064,
NCV33064
Undervoltage Sensing
Circuit
The MC34064 is an undervoltage sensing circuit specifically
designed for use as a reset controller in microprocessor−based
systems. It offers the designer an economical solution for low voltage
detection with a single external resistor. The MC34064 features a
trimmed−in−package bandgap reference, and a comparator with
precise thresholds and built-in hysteresis to prevent erratic reset
operation. The open collector reset output is capable of sinking in
excess of 10 mA, and operation is guaranteed down to 1.0 V input with
www.DataSheet4lUow.cosmtandby current. The MC devices are packaged in 3−pin TO-92,
micro size TSOP−5, 8−pin SOIC−8 and Micro8t surface mount
packages. The NCV device is packaged in SOIC−8 and TO−92.
Applications include direct monitoring of the 5.0 V MPU/logic
power supply used in appliance, automotive, consumer and industrial
equipment.
Features
• Trimmed−In−Package Temperature Compensated Reference
• Comparator Threshold of 4.6 V at 25°C
• Precise Comparator Thresholds Guaranteed Over Temperature
• Comparator Hysteresis Prevents Erratic Reset
• Reset Output Capable of Sinking in Excess of 10 mA
• Internal Clamp Diode for Discharging Delay Capacitor
• Guaranteed Reset Operation with 1.0 V Input
• Low Standby Current
• Economical TO−92, TSOP−5, SOIC−8 and Micro8 Surface Mount
Packages
• NCV Prefix for Automotive and Other Applications Requiring Site
and Control Changes
• Pb−Free Packages are Available
Input 2 (2)
Reset
1 (1)
1.2 Vref
GND 3 (4)
=
Sink Only
Positive True Logic
Pin numbers adjacent to terminals are for the 3−pin TO−92 package.
Pin numbers in parenthesis are for the 8−lead packages.
This device contains 21 active transistors.
Figure 1. Representative Block Diagram
© Semiconductor Components Industries, LLC, 2005
February, 2005 − Rev. 12
1
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1
2
3
8
1
8
1
5
1
TO−92
P SUFFIX
CASE 29
Pin 1. Reset
2. Input
3. Ground
SOIC−8
D SUFFIX
CASE 751
Micro8
DM SUFFIX
CASE 846A
TSOP−5
SN SUFFIX
CASE 483
Pin 1. Reset
2. Input
3. Ground
4. NC
5. NC
PIN CONNECTIONS
Reset 1
Input 2
N.C. 3
Ground 4
8 N.C.
7 N.C.
6 N.C.
5 N.C.
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 6 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 7 of this data sheet.
Publication Order Number:
MC34064/D
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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 .
VH
(mV)
20
51
40
81
71
112
100
164
190
327
276
480
TEST DATA
DVth
(mV)
0
3.4
6.8
6.8
10
10
16
16
34
34
51
51
RH
(W)
0
10
20
20
30
30
47
47
100
100
150
150
RL
(kW)
0
1.5
4.7
1.5
2.7
1.5
2.7
1.5
2.7
1.5
2.7
1.5
Figure 10. Low Voltage Microprocessor Reset with Additional Hysteresis
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4
4페이지 TSOP−5
SN SUFFIX
CASE 483
54
SDYYW
1 23
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MC34064, MC33064, NCV33064
MARKING DIAGRAMS
SOIC−8
D SUFFIX
CASE 751
8
3x064
ALYW5
1
Micro8
DM SUFFIX
CASE 846A
8
Ly50
AYW
1
TO−92
P SUFFIX
CASE 29 *
MC3x0
64P−5
ALYWW
SDY = Device Code
x = 3 or 4
y = I or C
A = Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
*This marking diagram also applies to NCV33064P.
123
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