Power Supply Monitor with Watch-Dog Timer MB3773 DESCRIPTION
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DS04-27401-4E
Power Supply Monitor with Watch-Dog Timer
MB3773
DESCRIPTION
Fujitsu MB3773 designed monitor voltage level power supply (+5V arbitrary voltage) microprocessor circuit, memory board large-size computer, example. MB3773 also contains watch-dog timer function detect uncontrol. Table status processor reset system/processor. circuit's power supply deviates more than specified amount, then MB3773 generates reset signal microprocessor. Thus, computer data protected from accidental erasure. When MB3773 does receive clock pulse from processor specified period, MB3773 generates reset signal mciroprocessor. Using MB3773 requires external components. monitor only volt supply, MB3773 requires connection external capacitor. MB3773 available 8-pin Dual In-Line package space saving Flat Package, Single In-Line Package. voltage detection 4.2V ±2.5%) level with hysterisis voltage output reset signal (VCC 0.8V typ.) reference voltage output (VREF 1.245 V±1.5%) clock monitor reset signal generator input watch-dog timer number external components (one capacitor min.) variety packages 8-pin Dual In-Line Package 8-pin Flat Package 8-pin Single In-Line Package PLASTIC PACKAGE SIP-8P-M03 PLASTIC PACKAGE FPT-8P-M01 PLASTIC PACKAGE DIP-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.
MB3773
ASSIGNMENT
RESET View VREF RESET Front View (DIP-8P-M01) (FPT-8P-M01)
RESET VREF RESET
(SIP-8P-M03)
ABSOLUTE MAXIMUM RATINGS
Parameter Symbol Rating -0.3 -0.3 +0.3 (+18) -0.3 -0.3 +0.3 (+18) +125 Unit
Supply voltage Input voltage
RESET, RESET Supply voltage Power dissipation(Ta 85°C) Storage temperature
NOTE:
TSTG
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.
MB3773
BLOCK DIAGRAM
Reference 1.24V COMP.S Inhibit Watch Timer RESET RESET Reference Voltage Generator 1.2µA 1.24V 10µA 10µA
COMP
RECOMMENDED OPERATING CONDITIONS
Parameter Symbol IOUT tFC, Value +3.5 -200 1000 <100 0.001 Unit
Supply voltage Reset, reset sink current VREF output current Watch clock setting time Rising/falling time Terminal capacitance Operating ambient temperature
MB3773
ELECTORICAL CHARACTERISTICS
Characteristics
(VCC=5V, Ta=25°C) Value Parameter Condition Watch timer operating -40°C +85°C 4.05 4.20 -40°C +85°C 4.15 VHYS VREF VREF1 VREF2 ICTD VOH1 VOH2 VOL1 VOL2 VOL3 VOL4 IOL1 IOL2 1.227 1.215 -1.0 4.30 1.245 1.245 1.25 -0.1 4.45 1.263 1.275 IRESET -5µA IRESET open, IRESET open, IRESET 10mA VRESET 1.0V open, VRESET 1.0V 4.20 4.30 4.35 4.40 Symbol 4.20 4.30 4.10 Unit
Supply current
Detection voltage
Hysterisis width
Reference voltage -40°C +85°C Reference voltage change rate Reference voltage output loading change rate threshold voltage input current 0.0V input current Watch timer operating 1.0V open, IRESET -5µA High level output voltage IOUT -200µA to+5µA -40°C +85°C 5.0V
Output saturation voltage
IRESET 10mA
Output sink current
MB3773
Characteristics (Continued)
(VCC=5V, Ta=25°C) Parameter charge current Min. supply voltage RESET Min. supply voltage RESET Condition Power reset operating 1.0V VRESET 0.4V IRESET 0.2mA VRESET =VCC -0.1V GND) Symbol ICTU VCCL1 VCCL2 Value Unit
(2)AC
Characteristics
(VCC=5V, Ta=25°C) Parameter Condition Symbol Value Unit
input pulse width
input pulse width input frequency Watch timer watching time Watch timer reset time Rising reset hold time
TCKW
0.1µF 0.1µF 0.1µF, RESET, 2.2k 100pF RESET, 2.2k 100pF 2.2k 100pF 2.2k 100pF
TPD1 TPD2
Output propagation Delay time from
Output rising time Output falling time
Output rising/falling time measured voltage.
MB3773
Fig. MB3773 Basic Operation
RESET RESET Logic Circuit RESET RESET (ms) (ms) (ms) 1000 (µF) (µF) (µF) 0.1µF (100ms) (10ms) (2ms)
0.8V
RESET
MB3773
TYPICAL CHARACTERISTIC CURVES
Fig. Supply current supply voltage
0.75
Fig. Output voltag supply voltage
(RESET pin) Pull 2.2k -40°C, 25°C, 85°C
85°C 25°C -40°C
Supply current (mA)
0.65 0.55 0.45 0.35 0.25 0.15
0.1µF -40°C 25°C 85°C
Output voltage RESET
10.0 12.0 14.0 16.0 18.0 20.0 Supply voltage
Supply voltage
Fig. Output voltag supply voltage
(RESET pin) Output voltage RESET 85°C 25°C -40°C Supply voltage Pull 2.2k Detection voltage 4.50 4.44 4.30
Fig. Detection voltage (VSH, VSL) temperature
(RESET, RESET pin)
4.20 4.10 4.00
Temperature (°C)
Fig. Output saturation voltage output sink current
Output saturation voltage (mV) -40°C Output saturation Voltage VOL8 (mV) (RESET pin) 0.1µF
Fig. Output saturation voltage output sink current
(RESET pin) 0.1µF -40°C 25°C 85°C
25°C 85°C
10.0 12.0 14.0 16.0 18.0 Output sink current IOL2 (mA)
10.0 12.0 14.0 16.0 18.0 Output sink current IOL8 (mA)
MB3773
TYPICAL CHARACTERISTIC CURVES (Continued)
Fig. High level output voltage high level output current
High level output voltage (RESET pin) 0.1µF
Fig. High level output voltage high level output current
(RESET pin) 0.1µF -40°C
High level output voltage
25°C -40°C 85°C
High level output current IOH2 (µA)
High level output current IOH8 (µA)
Fig. Reference voltage supply voltage
1.246 Reference voltage 1.244 1.242 1.240 1.238 1.236 1.234 11.0 13.0 15.0 17.0 19.0 21.0 Supply voltage 0.1µF 85°C -40°C 25°C 1.255
Fig. Reference voltage reference current
0.1µF 1.250 25°C 1.245 85°C -40°C 1.240
Reference voltage
-120 -160 -200 Reference current IREF (µA)
-240
Fig. Reference voltage temperature
1.27 Rising reset hold time (msec) 1.26 Reference voltage 1.25 1.24 1.23 1.22 1.21 Temperature Ta(°C)
Fig. Rising reset hold time temperature
0.1µF
Temperature Ta(°C)
MB3773
TYPICAL CHARACTERISTIC CURVES (Continued)
Fig. Reset time temperature
watch timer) Watch timer watching time (msec) Rwset time (msec) 0.1µF
Fig. Watch timer watching time temperature
Temperature (°C) 0.1µF
Temperature (°C)
Fig. Terminal capacitance rising reset hold time
Rising reset hold time (ms)
Fig. Terminal capacitance reset time
watch timer) Reset time (ms)
Fig. Terminal capacitance watch timer watching time
(ms) Watch timer watching time 10-1 10-2 10-3 10-3 10-2 10-1 Terminal capacitance (µF) 25°C, 85°C -40°C
10-1 10-2 10-3 10-3 10-2 10-1 Terminal capacitance (µF) 25°C 85°C -40°C
-40°C
25°C, 85°C
10-2 10-3
Terminal capacitance (µF)
MB3773
APPLICATION CIRCUIT
EXAMPLE Monitoring Supply Voltage Watch-dog Timer
(5V) MB3773 RESET RESET Logic circuit
Supply voltage monitored using Detection voltage VSL.
EXAMPLE Supply Voltage Monitoring (external fine-tuning type)
(5V) MB3773 RESET RESET Logic circuit
detection voltage adjusted externally. Selecting values that sufficiently lower than resistance IC's internal voltage divider allows detection voltage according resistance ratio between (See table below.)
Detection voltage:VSL Detection voltage:VSH
MB3773
EXAMPLE With Forced Reset (with reset hold)
MB3773 RESET RESET Logic circuit
Grouding time sets RESET (pin RESET (pin High.
MB3773 RESET RESET Logic circuit
RESIN
Feeding signal RESIN turning sets RESET RESET High.
MB3773
EXAMPLE Montitoring Supply Voltages (with hysterisis, reset output NMI)
VCC2(12V) VCC1 (5V)
MB3773 100k 180k 1.2k Comp. Comp. RESET RESET
Logic circuit
port
5.1k
4.7k
Example
Comp. Comp. MB4204, MB47393
NOTE: supply voltage monitored MB3773. supply viltage monitored external circuit. output connected and, when voltage drops, Comp. interrrupts logic circuit. VCC1 (=5V) power comparators (Comp. Comp. external circuit shown above. detection voltage VCC2 (=12V) supply voltage approximately 0.2V. VCC2 detection voltage hysterisis width found using following formulas:
Detection voltage
VREF (Approx. 9.4V above illustration) (Approx. 9.2V above illustration)
VREF
Hysterisis width
VHYS
MB3773
EXAMPLE Montitoring Supply Voltages (with hysterisis reset output)
VCC2 (12V) VCC1 (5V) 180k 1.2k Comp. Comp. Diode RESET RESET
MB3773
Logic circuit
5.1k
4.7k
Example
Comp. Comp. MB4204, MB47393
NOTE: When either supply voltage decreases below detection voltage (VSL), MB3773 RESET High MB3773 RESET Low. VCC1 (=5V) power comparators (Comp. Comp. external circuit shown above. detection voltage VCC2 (=12V) supply voltage approximately 9.2V/9.4V hysterisis width approximately 0.2V. formulas finding hysterisis width detection voltage, section
MB3773
EXAMPLE Montitoring voltage Overvoltage Monitoring (with hysterisis)
(5V) 180k 1.2k Comp. Comp. Diode RESET RESET
MB3773
Logic circuit
5.6k
4.7k
Example
RESET
Comp. Comp. MB4204, MB47393
Comp. Comp. used monitor overvoltage while MB3773 used monitor voltage. Detection voltages V1/V1H time voltage areappoximately 4.2V/4.3V. Detection voltages V2L/V2H time overvoltage approximately 6.0V/6.1V. formulas finding hysterisis width detection voltage, section (=5V) power comparators (Comp. Comp. external circuit shown above.
MB3773
EXAMPLE Monitoring Supply Voltage Using Delayed Trigger
MB3773 RESET RESET
Logic circuit
Adding voltage such shown figure increases minimum input pulse width microseconds 1000pF).
MB3773
EXAMPLE Stopping Watch-dog Timer (Monitering only supply voltage) These example application circuts which MB3773 monitors supply voltage alone without resetting microcomputer even latter, used standby mode, stops sending clock pulse MB3773. watch-dog timer inhibited clamping voltage VREF supply voltage constantly monitored even while watch-dog timer inhibited. this reason, reset signal output occurrence either instataneous disruption sudden drop voltage. Note that application examples hold signal inactive when watch-dog timer inhibited time resetting. hold signal active when microcomputer reset, solution gate, examples Using transistor
VCC(5V)
MB3773 RESET RESET HALT R2=1k R1=1M
Logic circuit
Using transistor
(5V)
MB3773 RESET RESET HALT R2=1k R1=51k
Logic circuit
(Continued)
MB3773
(Continued)
Using transistor
(5V)
MB3773 R1=1M RESET RESET HALT R2=1k
Logic circuit
Using transistor
(5V)
MB3773 1=51k RESET RESET HALT R2=1k
Logic circuit
MB3773
EXAMPLE Reducing Reset Hold Time
VCC(=5V) (=5V)
MB3773 RESET RESET
Logic circuit
MB3773 RESET RESET
Logic circuit
reduction method
Standard usage
RESET only output that used. Standard TPR, value found using following formulas. Formulas (ms) (µF) (ms) (µF) (ms) (µF) above formulas allow standard values determining TPR, TWR. Reset hold time compared below between reduction circuit standard circuit.
0.1µF reduction circuit 10ms 10ms 1.6ms Standard circuit 100ms 10ms 2.0ms
MB3773
EXAMPLE Circuit Monitoring Multiple Microcomputers
(=5V)
RESET RESET
RESET RESET
RESET RESET
MB3773
Figure
connects from outputs input. Depending timing, these connections necessary. Example:R 2.2k 0.1µF
Output
Figure
MB3773
Description Application Circuits Using MB3773, this application circuit monitors multiple microcomputers system. Signals from each microcomputer sent FF1, clock inputs. Figure shows these timings. Each flip-flop operates using signals sent from microcomputers clock pulse. When even signal stops, relevant receiving flip-flop stops operating. result, cyclical pulses generated output Since clock pulse stops arriving MB3773, MB3773 generates reset signal. Note that output frequncy will following range, where clock frequencies CK1, respectively.
where lowest frequency among
MB3773
EXAMPLE Circuit Limiting Upper Clock Input Frequency
(5V) R1=10k RESET RESET
This example application limit upper frequency clock pulses sent from microcomputer. cycle sent from microcomputer exceeds circuit generates reset signal. (The lower freqency already been using Cr.) When clock pulse such shown below sent short prevents voltage from reaching input threshold level 1.25V), will cause reset signal output. value found using following formula C2R2
waveform
where 3.0µsec, 20µsec
voltage
Example Setting allow upper value (See table below.) 0.01µF 0.1µF 30µs 300µs
MB3773
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
Dimensions (inches).
1994 FUJITSU LIMITED D08006S-2C-3
MB3773
PACKAGE DIMENSIONS (Continued)
pin, Plastic (FPT-8P-M01)
2.25(.089)MAX 6.35 -0.20 .250 -.008
+0.25 +.010
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
Dimensions (inches).
1994 FUJITSU LIMITED F08002S-4C-4
MB3773
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)
Dimensions (inches).
1994 FUJITSU LIMITED S08010S-3C-2
MB3773
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 211-8588, Japan Tel: (044) 754-3763 Fax: (044) 754-3329
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.
http://www.fujitsu.co.jp/
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F9803 FUJITSU LIMITED Printed Japan
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