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PDF MB3771 Data sheet ( Hoja de datos )
| Número de pieza | MB3771 | |
| Descripción | Power Supply Monitor | |
| Fabricantes | Fujitsu | |
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FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27400-7E
ASSP For power supply applications
BIPOLAR
Power Supply Monitor
MB3771
s DESCRIPTION
The Fujitsu MB3771 is designed to monitor the voltage level of one or two power supplies (+5 V and an arbitrary
voltage) in a microprocessor circuit, memory board in large-size computer, for example.
If the circuit’s power supply deviates more than a specified amount, then the MB3771 generates a reset signal to
the microprocessor. Thus, the computer data is protected from accidental erasure.
Using the MB3771 requires few external components. To monitor only a +5 V supply, the MB3771 requires the
connection of one external capacitor. The level of an arbitrary detection voltage is determined by two external
resistors. The MB3771 is available in an 8-pin Dual In-Line, Single In-Line Package or space saving Flat Package.
s FEATURES
• Precision voltage detection (VSA = 4.2 V ± 2.5 %)
• User selectable threshold level with hysterisis (VSB = 1.23 V ± 1.5 %)
• Monitors the voltage of one or two power supplies (5 V and an arbitrary voltage, >1.23 V)
• Usable as over voltage detector
• Low voltage output for reset signal (VCC = 0.8 V typ.)
• Minimal number of external components (one capacitor min.)
• Low power dissipation (ICC = 0.35 mA typ., VCC = 5 V)
• Detection threshold voltage has hysteresis function
• Reference voltage is connectable.
s PACKAGES
8-pin plastic DIP
8-pin plastic SIP
8-pin plastic SOIP
(DIP-8P-M01)
(SIP-8P-M03)
(FPT-8P-M01)
1 page  
MB3771
s ELECTRICAL CHARACTERISTICS
1. DC Characteristics
Parameter
Power supply current
Detection voltage
Hysterisis width
Detection voltage
Deviation of detection voltage
Hysterisis width
Input current
“H” level output voltage
Output saturation voltage
Output sink current
CT charge current
Input current
Detection voltage
Deviation of detection voltage
Output leakage current
Output saturation voltage
Output sink current
Reset operation minimum
supply voltage
Symbol
Conditions
ICC1 VSB = 5 V, VSC = 0 V
ICC2 VSB = 0 V, VSC = 0 V
VSAL
VCC
(DOWN) Ta = −40 °C to +85 °C
VCC
VSAH (UP)
Ta = −40 °C to +85 °C
VHYSA
VSB
VSB
Ta = −40 °C to +85 °C
∆VSB VCC = 3.5 V to 18 V
VHYSB
IIHB VSB = 5 V
IILB VSB = 0 V
VOHR
IRESET = −5 µA, VSB = 5 V
VOLR
IRESET = 3mA, VSB = 0 V
IRESET = 10mA, VSB = 0 V
IRESET VOLR = 1.0 V, VSB = 0 V
ICT VSB = 5 V, VCT = 0.5 V
IIHC VSC = 5 V
IILC VSC = 0 V
VSC
Ta = −40 °C to +85 °C
∆VSC VCC = 3.5 V to 18 V
IOHC
VOHC = 18 V
VOLC
IOUTC = 4 mA, VSC = 5 V
IOUTC
VOLC = 1.0 V, VSC = 5 V
Min.
4.10
4.05
4.20
4.15
50
1.212
1.200
14
4.5
20
9
1.225
1.205
6
VCCL
VOLR = 0.4 V, IRESET = 200 µA
(VCC = 5 V, Ta = + 25 °C)
Value
Typ.
Max.
Unit
350 500 µA
400 600 µA
4.20 4.30 V
4.20 4.35
V
4.30 4.40 V
4.30 4.45
V
100 150 mV
1.230 1.248 V
1.230 1.260 V
3 10 mV
28 42 mV
0 250 nA
20 250 nA
4.9 V
0.28 0.4 V
0.38 0.5 V
40 mA
12 16 µA
0 500 nA
50 500 nA
1.245 1.265 V
1.245 1.285 V
3 10 mV
0 1 µA
0.15 0.4 V
15 mA
0.8 1.2 V
5
5 Page 
MB3771
9. Dual (Positive/Negative) Power Supply Voltage Monitoring (VCC = 5 V, VEE = Negative Power
Supply)
Monitors a 5 V and a negative (any given level) power supply. R1, R2, and R3 should be the same value.
Detection Voltage = VSB - VSB × R4/R3
Example if VEE = -5 V, R4 = 91 kΩ
Then the detected voltage = -4.37 V
In cases where VEE may be output when VCC is not output, it is necessary to use a Schottky barrier diode (SBD).
VCC
R5 : 5.1 kΩ
MB3771
VEE
R4
R3 :
20 kΩ
1
2
3
8
7
6
0.22 µF
CT
SBD 4 5
RESET
R1 : 20 kΩ
R2 : 20 kΩ
10. Reference Voltage Generation and Voltage Sagging Detection
(1) 9V Reference Voltage Generation and 5V/9V Monitoring
Detection Voltage = 7.2 V
In the above examples, the output voltage and the detection voltage are determined by the following equations:
Detection Voltage = (R1 + R2) × VSB/R2
15 V
V CC : 5 V
CT
0.47 µF
R 5 : 3 kΩ
MB3771
18
27
36
45
R3 :
7.5 kΩ
R4 :
1.2 kΩ
RESET
9 V (≅ 50 mA)
R 1: 300 kΩ
R 2: 62 kΩ
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet MB3771.PDF ] | |
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