POWER SUPPLY MONITOR MB3771 POWER SUPPLY MONITOR Fujits

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POWER SUPPLY MONITOR MB3771 POWER SUPPLY MONITOR Fujits

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DS04-27400-5E
POWER SUPPLY MONITOR
MB3771
POWER SUPPLY MONITOR
Fujitsu MB3771 designed monitor voltage level power supplies (+5V arbitrary voltage) microprocessor circuit, memory board large-size computer, example. circuit's power supply deviates more than specified amount, then MB3771 generates reset signal microprocessor. Thus, computer data protected from accidental erasure. Using MB3771 requires external components. monitor only supply, MB3771 requires connection external capacitor. level arbitrary detection voltage determined external resistors. MB3771 available 8-pin Dual In-Line, Single In-Line Package space saving Flat Package.
PLASTIC PACKAGE DIP-8P-M01
Precision voltage detection (VSA 4.2V ±2.5%) User selectable threshold level with hysterisis (VSB 1.23V ±1.5%) Monitors voltage power supplies arbitrary voltage,
>1.23V)
voltage output reset signal (VCC 0.8V typ.) Minimal number external components (one capacitor min.) power dissipation (ICC 0.35 typ., Usable over voltage detector Detection threshold voltage hysteresis function Reference voltage connectable. Available variety packages 8-pin Dual In-Line Package 8-pin Single In-Line Package 8-pin Flat Package
PLASTIC PACKAGE SIP-8P-M03
PLASTIC PACKAGE FPT-8P-M01
This device contains circuitry protect inputs against damage high static voltages electric fields. However, advised that normal precautions taken avoid application voltage higher than maximum rated voltages this high impedance circuit.
MB3771
ASSIGNMENT
OUTC VIEW VSB/RESIN RESET FRONT VIEW
RESET VSB/RESIN OUTC
(DIP-8P-M01) (FPT-8P-M01)
(SIP-8P-M03)
ABSOLUTE MAXIMUM RATINGS
Symbol TSTG Rating -0.3 -0.3 +0.3 (<+20) -0.3 -0.3 85°C) +125 Unit
Parameter Supply Voltage Input Voltage Input Voltage Input Voltage Power Dissipation Storage Temperature
NOTE:
Permanent device damage occur above Absolute Maximum Ratings exceeded. Functional operation should restricted conditions detailed operational sections this data sheet. Exposure absolute maximum rating conditions extended periods affect device reliability.
MB3771
BLOCK DIAGRAM
1.24V REFERENCE VOLTAGE 100K 12µA Comparator
1.24V
10µA
RESIN
Comparator
Comparator
RESET OUTC
FUNCTIONAL EXPLANATIONS
Detection voltage inputs connected inverting input Comparators respectively. Both comparators have built-in hysterisis. either drops lower than about 1.23V, then RESET goes low. Comparator used arbitrary preset voltage detection (See Example forced reset input logic level input. (See Example Comparator designed open-collector output with inverted polarity input/output characteristics. Comparator hysteresis. used over-voltage detection (See Example 11), generation RESET signal positive logic (See Example generation reference voltage (See Example 10). Note that should connected with respectively. (See Example MB3771 detect about voltage sag/surge power supply. user delayed trigger capacity connecting capacitor between inputs VSS. (See Example Internal pull-up resistor RESET line provides high impedance loading (i.e. CMOS logic).
MB3771
RECOMMENDED OPERATING CONDITIONS
Parameter Symbol IRESET IOUTC Rating +3.5 Unit
Supply Voltage Output Current (RESET) Output Current (OUTC) Operating Ambient Temperature
ELECTRICAL CHARACTERISTICS
(VCC 25°C)
Value Parameter Condition Symbol ICC1 ICC2 4.10 VSAL +85°C 4.05 4.20 VSAH +85°C 4.15 VHYSA 1.212 +85°C 1.200 VHYSB IIHB IILB VOHR VOLR IRESET 10mA, IRESET 0.38 VOLR 1.0V, 0.5V 1.230 0.28 1.260 4.30 1.230 4.45 1.248 4.20 4.30 4.35 4.40 4.20 4.30 Unit
CHARACTERISTICS
Supply Current Sugging Detection Voltage Falling
Rising
Hysterisis Width
Sagging Detection Voltage
Deviation Detection Voltage Hysterisis Width Input Current
High-Level Output Voltage Output Saturation Voltage Output Sink Current Charge Current IRESET -5µA, IRESET 3mA,
MB3771
ELECTRICAL CHARACTERISTICS (Continued)
(VCC 25°C)
Value Parameter Condition Symbol IIHC IILC +85°C 1.205 IOHC VOLC IOUTC VCCL 1.245 0.15 1.285 VOHC IOUTC 4mA, VOLC 1.0V, VOLR 0.4V, IRESET 200µA 1.225 1.245 1.265 Unit
CHARACTERISTICS
Input Current Detection Voltage Deviation Detection Voltage Output Leakage Current Output Saturation Voltage Output Sink Current Reset Operation Minimum Supply Voltage
CHARACTERISTICS
Parameter Input Pulse Width RESET Output Pulse Width RESET Rising Time RESET Falling Time 2.2K, 100pF 2.2K, 100pF Condition Symbol
(VCC 25°C 0.01µF)
Value Unit
Propagation Delay Time
2.2K, 100p 2.2K, 100pF
tPHL tPLH
Note:
case termination. case termination
MB3771
FUNCTION EXPLANATION
RESET
VHYS
0.8V
RESET
Point When rises about 0.8V, RESET goes low. Point When reaches +VHYS, then begins charging. RESET remains during this time. Point RESET goes high when begins charging. [ms] [µF] Point When level dropps lower then then RESET goes starts discharging. Point When level reaches VHYS, then starts charging case voltage sagging, period from time goes lower than equal time reaches +VHYS again, longer than tP1, specified Characteristics), discharged charged successively. Point After passes, level exceeds VHYS, then RESET goes high. Point Same Point Point RESET remains until drops below 0.8V.
MB3771
APPLICATION CIRCUIT
EXAMPLE Power Supply Monitor
MB3771 RESET Logic Circuit
NOTE: Monitored VSA. Detection Threshold Voltage VSAL VSAH.
EXAMPLE Power Supply Monitor with external adjust
MB3771 RESET Logic Circuit
NOTE: Detection voltages adjusted shown below.
Detection Voltage VSAL 4.37 4.11 VSAH 4.47 4.20
EXAMPLE Arbitrary Voltage Supply Monitor Example Case: Detection Voltage Detection Voltage VSB/R2 Connect when less than 4.45V. opened when greater than 4.45V.
Power Dissipation reduced. MB3771 RESET
NOTE: Hysteresis 28mV termination available. Hysteresis width dose depend R2).
MB3771
EXAMPLE Arbitrary Voltage Supply Monitor Example Case:
Stablized 100k 0.47µ RESET
RESET output levels range from approximately. Device damage occur RESET exceeds high level (1V). Output voltage maximum RESET voltage levels determined resistor this case, stabilized output used power circuitry. Using chart below, value determined with respect output current.
Detection
Min. VCC* adequat RESET
0.51
Output Current [mA]
NOTE: Resistor values determined when OUTC 100µA, VOLC 0.4V. resistor 1/4W.
EXAMPLE Power Supply Monitor (VCC1 VCC2 12V)
VCC2 VCC1 MB3771 390K RESET Logic Circuit
NOTE: monitored VSA. Detection voltage about 4.2V. monitored VSB. When 390K 62K, Detection voltage about 9.0V.Generally detection voltage determined following equation. Detection Voltage VSB/R2
MB3771
EXAMPLE Power Supply Monitor (RESET signale generated VCC1 VCC2 12V)
VCC2 VCC1 390K 100K
MB3771
RESET Port Logic Circuit
510K
NOTE: monitored VSA, generates RESET signal when detects voltage sagging.12V monitored VSC, generates detection signal detection voltage monitoring hysterisis determined following equations.
Detection voltage Hysterisis width
(8.95 volts circuit above)
(200mV circuit above)
EXAMPLE Power Supply Monitor with forced RESET input
RESIN MB3771 RESET Logic Circuit
NOTE: RESIN compatible input.
MB3771
EXAMPLE Power Supply Monitor with Non-inverted RESET
MB3771
RESET
NOTE: this case, Comparator used invert RESET signal. OUTC open-collector output. used pull-up resistor.
EXAMPLE Power Supply Monitor with delayed trigger
MB3771 Logic Circuit RESET min. 40µs when 1000pF.
EXAMPLE Arbitrary Negative Voltage Monitor
5.1K
MB3771 RESET
0.22µF
NOTE: negative voltage monitored respectively. should same value. negative detection voltages determined following equation. Detection Voltage -VSBR4/R3 Example: When 91K, -4.37V.
MB3771
EXAMPLE Reference Voltage Generation Voltage Sagging Detection Example 10a: Reference Voltage Generation 5V/9V Monitoring
MB3771 0.47µF 7.5K 300K (upto 50mA) RESET
1.2K
NOTE: Detection Voltage: 7.2V, 4.2V above examples, output voltage detection voltage determined following equations: Output Voltage: VSC/R4 Detection Voltage: VSB/R2
Example 10b: Reference Voltage Generation Monitoring
MB3771 0.47µF 3.6K (upto 50mA) RESET
1.2K
NOTE: Detection Voltage: 4.2V above examples, output voltage determined following equations: Output Voltage: VSC/R4
MB3771
Example 10c: Reference Voltage Generation Monitoring
MB3771 100K RESET
0.47µF
Using reference table below, value determined. Where 100K, 33K, 0.47µF Reference Table output current.
Output Current [mA]
Example 10d: 1.245V Reference Voltage Generation Monitoring
(5V)
MB3771 RESET
0.47µF
Reference Voltage 1.245V typ.
NOTE: Resistor determines Reference current. Using 1.2K reference current about 2mA.
MB3771
EXAMPLE Voltage Over Voltage Detection
RESET MB3771 RESET
NOTE: hysteresis. When over voltage detected, RESET held constant time well when voltage detected. VSB/R2 VSC/R4
EXAMPLE Detection Abnormal State Power Supply System
This Example circuit detects abnormal low/over voltage power supply voltage indicated indicator. reset CLEAR key.
MB3771
CLEAR
Where 620, 100K
NOTE: detection levels low/over voltages determined respectively.
MB3771
EXAMPLE Back-up Power Supply System (VCC
0.6V 130K
6.2K 100K 100K VCCO
MB3771
Diode been added prevent Comp.C from malfunctionig when voltage low. with care given temperature characteristics (typically negative temperature characteristics).
NOTE: CMOS Logic connect CMOS logic with VCCO. back-up battery works after goes high During tPO, memory access prohibited. CS`s threshold voltage V1is determined following equation: VSB/R3 voltage change provided following equation: (R1+ VSC/(R2
VCCO
MB3771
Fig. Supply Current ICC1 Supply Voltage
Fig. Supply Current ICC2 Supply Voltage
Supply Current Icc1 [µA]
-40°C 25°C 85°C
Supply Current Icc2 [µA]
25°C -40°C 85°C
25°C
25°C 85°C
-40°C
85°C -40°C
Supply Voltage
Supply Voltage
Fig. Detection Voltage Ambient Temperature
1.30
Fig. Detection Voltage Abient Temperature
Detection Voltage SBH,
VSAH VSAL
Detection Voltage
SAH,
VSBH
1.25 VSBL
1.20
Ambient Temperature [°C]
Ambient Temperature [°C]
Fig. Detection Voltage Ambient Temperature
1.30
Fig. Detection Voltage VSB, Supply Voltage
1.27
Detection Voltage VSC, VSBL, VSBH
1.26 VSBH 1.25 1.24 VSBL 1.23
Detection Voltage
1.25
1.22
1.21 1.20
1.20
Ambient Temperature [°C]
Supply Voltage
MB3771
Reset High-level Voltage VOHR
Fig. RESET Output Voltage Supply Voltage
Reset Output Voltage VOLR
Fig. RESET High-level Voltage RESET Output Current
-40°C
85°C 25°C -40°C
85°C
25°C
Supply Voltage
RESET Output Current [µA]
Fig. RESET Low-level Voltage RESET Output Current
Reset Low-level Voltage VOLR
Fig. OUTC Output Voltage OUTC Output Current
Outc Output Voltage VOLC
85°C -40°C 25°C 85°C
-40°C
25°C
RESET Output Current IRESET [mA]
OUTC Output Current IOUTC [mA]
Fig. Capacitance Reset Hold Time
Fig. Reset Hold Time Supply Voltage 0.01µF)
-40°C
Reset Hold Time [sec]
100m
Reset Hold [ms]
-40°C
25°C
25°C 85°C
85°C 100µ
100p 1000p 0.01µ 0.1µ 100µ
Capacitance
Supply Voltage
MB3771
PACKAGE DIMENSIONS
pin, Plastic (DIP-8P-M01)
9.40 -0.30
+0.40 +.016
.370 -.012
INDEX
6.20±0.25 (.244±.010)
4.36(.172)MAX
0.51(.020)MIN 0.25±0.05 (.010±.002)
3.00(.118)MIN
0.46±0.08 (.018±.003)
+0.30 +.012
0.99
+0.30 +.012
1.52
.039 +0.35 0.89 -0.30
.035 -.012
+.014
.060 2.54(.100)
7.62(.300)
15°MAX
1994 FUJITSU LIMITED D08006S-2C-3
Dimensions (inches).
MB3771
PACKAGE DIMENSIONS (Continued)
pin, Plastic (SIP-8P-M03)
19.65 -0.35
+0.15 +.006
3.26±0.25 (.128±.010)
.774 -.014
INDEX-1 6.20±0.25 (.244±.010) 8.20±0.30 (.323±.012)
INDEX-2
0.99
+0.30 +.012
.039
4.00±0.30 (.157±.012)
2.54(.100)
1.52
+0.30 +.012
.060
0.50±0.08 (.020±.003)
0.25±0.05 (.010±.002)
1994 FUJITSU LIMITED S08010S-3C-2
Dimensions (inches).
MB3771
PACKAGE DIMENSIONS (Continued)
pin, Plastic (FPT-8P-M01)
2.25(.089)MAX 6.35
+0.25 -0.20
.250
+.010 -.008
0.05(.002)MIN (STAND OFF)
INDEX
5.30±0.30 (.209±.012)
7.80±0.40 (.307±.016)
6.80 -0.20 +.016 .268 -.008
+0.40
1.27(.050) 3.81(.150)REF
0.45±0.10 (.018±.004)
0.15 -0.02 +.002 .006 -.001
+0.05
0.50±0.20 (.020±.008)
Details part 0.20(.008)
0.50(.020) 0.10(.004) 0.18(.007)MAX 0.68(.027)MAX
1994 FUJITSU LIMITED F08002S-4C-4
Dimensions mm(inches).
FUJITSU LIMITED
further information please contact:
Japan FUJITSU LIMITED Corporate Global Business Support Division Electronic Devices KAWASAKI PLANT, 4-1-1, Kamikodanaka Nakahara-ku, Kawasaki-shi Kanagawa 211-88, Japan Tel: (044) 754-3763 Fax: (044) 754-3329 North South America FUJITSU MICROELECTRONICS, INC. Semiconductor Division 3545 North First Street Jose, 95134-1804, U.S.A. Tel: (408) 922-9000 Fax: (408) 432-9044/9045 Europe FUJITSU MIKROELEKTRONIK GmbH Siebenstein 6-10 63303 Dreieich-Buchschlag Germany Tel: (06103) 690-0 Fax: (06103) 690-122 Asia Pacific FUJITSU MICROELECTRONICS ASIA PTE. LIMITED #05-08, Lorong Chuan Tech Park Singapore 556741 Tel: (65) 281-0770 Fax: (65) 281-0220
Rights Reserved. contents this document subject change without notice. Customers advised consult with FUJITSU sales representatives before ordering. information circuit diagrams this document presented examples semiconductor device applications, intended incorporated devices actual use. Also, FUJITSU unable assume responsibility infringement patent rights other rights third parties arising from this information circuit diagrams. FUJITSU semiconductor devices intended standard applications (computers, office automation other office equipment, industrial, communications, measurement equipment, personal household devices, etc.). CAUTION: Customers considering products special applications where failure abnormal operation directly affect human lives cause physical injury property damage, where extremely high levels reliability demanded (such aerospace systems, atomic energy controls, floor repeaters, vehicle operating controls, medical devices life support, etc.) requested consult with FUJITSU sales representatives before such use. company will responsible damages arising from such without prior approval. semiconductor devices have inherently certain rate failure. must protect against injury, damage loss from such failures incorporating safety design measures into your facility equipment such redundancy, fire protection, prevention over-current levels other abnormal operating conditions. products described this document represent goods technologies subject certain restrictions export under Foreign Exchange Foreign Trade Control Japan, prior authorization Japanese government should required export those products from Japan.
F9703 FUJITSU LIMITED Printed Japan

POWER SUPPLY MONITOR MB3771 POWER SUPPLY MONITOR Fujits

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