ASSP Power Supply Applications BIPOLAR Power Voltage Monitor
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DS04-27403-2E
ASSP Power Supply Applications
BIPOLAR
Power Voltage Monitoring with Watchdog Timer
MB3793-37A
DESCRIPTION
MB3793 integrated circuit monitor power voltage; incorporates watchdog timer. reset signal output when power falls abruptly. When power recovers normally after resetting, power-on reset signal output microprocessor units (MPUs). internal watchdog timer with inputs system operation diagnosis provide fall-safe function various applicaiton systems. There also mask option that detect voltages 0.1-V steps. model number MB3793-37A corresponding detected voltage. model number package code shown below. Model MB3793-37A Package code 3793AF Detection voltage
FEATURES
Precise detection power voltage fall: ±2.5% Detection voltage with hysteresis power dispersion: (reference) Internal dual-input watchdog timer Watchdog-timer halt function inhibition pin) Independently-set wacthdog reset times
PACKAGE
8-pin, Plastic 8-pin, Plastic
(FPT-8P-M01)
(FPT-8P-M02)
MB3793-37A
ASSIGNMENT
(Top view)
RESET
(FPT-8P-M01) (FPT-8P-M02)
DESCRIPTION
Symbol RESET Descriptions Outputs reset Watchdog timer monitor time setting Power-on reset hold time setting Ground Symbol Descriptions Power supply Inhibit Inputs clock Inputs clock
MB3793-37A
BLOCK DIAGRAM
blocks
RESET Output circuit Logic circuit
Comp.S Pulse generator VREF 1.24 blocks Watchdog timer Reference voltage generator
Pulse generator
MB3793-37A
BLOCK DESCRIPTION
Comp.
Comp. comparator with hysteresis compare reference voltage with voltage (VS) that result dividing power voltage (VCC) resistors When falls below 1.24 reset signal output. This function enables MB3793 detect abnomality within when power falls abruptly.
Output circuit
output circuit contains RESET output control comparator that compares voltage threshold voltage release RESET output voltage exceeds threshold value. Since reset (RESET) output buffer CMOS organization, pull-up resistor needed.
Pulse generator
pulse generator generates pulses when voltage clock pins changes High from level (positive-edge trigger) exceeds threshold voltage; sends clock signal watchdog timer.
Watchdog timer
watchdog timer monitor clock pulses. Short-circuit clock pins monitor single clock pulse.
Inhibition
inhibition (INH) forces watchdog timer on/off. When this High level, watchdog timer stopped.
Logic circuit
logic circuit contains flip-flops. Flip-flop RSFF1 controls charging discharging power-on reset time setting capacitor (CTP). Flip-flop RSFF2 turns on/off circuit that accelerates charging power-on reset time setting capacitor (CTP) reset. RSFF2 operates only reset; does operate power-on reset when power turned
MB3793-37A
ABSOLUTE MAXIMUM RATINGS
+25°C) Parameter Power supply voltage* Input voltage Reset output current Allowable loss Storage temperature RESET Symbol VCK1 VCK2 IINH Tstg Conditions +85°C +125 -0.3 Rating Min. -0.3 Max. Unit
power supply voltage based ground voltage WARNING: Semiconductor devices permanently damaged application stress (voltage, current, temperature, etc.) excess absolute maximum ratings. exceed these ratings.
RECOMMENDED OPERATING CONDITIONS
Parameter Power supply voltage Reset (RESET) output current Power-on reset hold time setting capacity Watchdog-timer monitoring time setting capacity Operating temperature Symbol Conditions Value Min. 0.001 0.001 Typ. Max. Unit
watchdog timer monitor time range depends rating setting capacitor. WARNING: recommended operating conditions required order ensure normal operation semiconductor device. device's electrical characteristics warranted when device operated within these ranges. Always semiconductor devices within their recommended operating condition ranges. Operation outside these ranges adversely affect reliability could result device failure. warranty made with respect uses, operating conditions, combinations represented data sheet. Users considering application outside listed conditions advised contact their FUJITSU representatives beforehand.
MB3793-37A
ELECTRICAL CHARACTERISTICS
Characteristics
(VCC +25°C) Parameter Power supply current Symbol ICC1 Detection voltage Detection voltage hysteresis difference Clock-input threshold voltage Clock-input hysteresis Inhibition-input voltage Input current (CK1, CK2, INH) Reset output voltage Reset-output minimum power voltage VSHYS VCIH VCIL VCHTS VIIH VIIL VCCL IRESET IRESET IRESET rising rising falling Conditions After exit from reset falling +25°C -40°C +85°C +25°C -40°C +85°C Value Min. 3.60 (3.55)* 3.69 (3.64)* (1.4)* (0.4)* -1.0 Typ. 3.70 3.70 3.79 3.79 4.75 0.12 Max. 3.80 (3.85)* 3.89 (3.94)* (1.8)* (0.8)* Unit
values enclosed parentheses setting assurance values.
Characteristics
(VCC +25°C) Parameter Power-on reset hold time input pulse width delay time Watchdog timer reset time Watchdog timer reset time Clock input pulse width Clock input pulse cycle Reset (RESET) output transition time*1 Rising Falling Symbol tCKW tCKT tr*1 tf*2 Conditions 0.01 Value Min. (110)*
Typ.
Max. (100)*2 22.5
Unit
*1:The voltage range testing reset output transition time. *2:The values enclosed parentheses setting assurance values.
MB3793-37A
DIAGRAM
Basic operation (Positive clock pulse)
tCKW
tCKT
RESET
(4)(5)
(10)
(11)
(12)
(13)
MB3793-37A
Basic operation (Negative clock pulse)
tCKW
tCKT
RESET
(4)(5)
(10)
(11)
(12)
(13)
MB3793-37A
Single-clock input monitoring (Positive clock pulse)
tCKW
tCKT
RESET
Note:
MB3793 monitor only clock. MB3793 checks clock signal every other input pulse. Therefore, watchdog timer monitor time time that allows MB3793 monitor period twice long input clock pulse.
MB3793-37A
Inhibition operation (Positive clock pulse)
tCKW
RESET
(4)(5)
(11)
(10)
(12)
(13)
MB3793-37A
Clock pulse input supplementation (Positive clock pulse)
Note:
MB3793 watchdog timer monitors Clock1 (CK1) Clock2 (CK2) pulses alternately. When pulse detected after detecting pulse, monitoring time setting capacity (CTW) switches charging from discharging. When consecutive pulses occur side this alternation before switching, second pulse ignored. above figure, pulse ignored.
OPERATION SEQUENCE
Positive clock pulse input
Basic operation (positive clock pulse)" under DIAGRAM."
Negative clock pulse input
Basic operation (negative clock pulse)" under DIAGRAM." MB3793 operates same whether inputs positive negative pulses.
Clock monitoring
MB3793 while monitoring only clock, connect clock pins CK2. Although MB3793 operates basically same when monitoring clocks, monitors clock signal every other input pulse. Single-clock input monitoring (positive clock pulse)" under DIAGRAM."
Description Operations
numbers given following items correspond numbers (13) used DIAGRAM." MB3793 outputs reset signal when supply voltage (VCC) reaches about (VCCL) reaches exceeds rise-time detected voltage VSH, MB3793 starts charging power-on reset hold time setting capacitor this time, output remains reset state. value about 3.79 When been charged certain period time (until voltage exceeds threshold voltage (Vth) after start charging), MB3793 cancels reset (setting RESET level from level).
MB3793-37A
value about with power-on reset hold timer monitor time with following equation: (ms) (µF) value about 1300 with MB3793 also starts charging watchdog timer monitor time setting capacitor (CTW). When voltage watchdog timer monitor time setting reaches level threshold voltage switches from charge state discharge state. value always about 1.24 regardless detected voltage. inputs clock pulse (positive edge trigger) when being discharged CK1-CK2 order simultaneously, switches from discharge state charge state. MB3793 repeats operations long CK1/CK2 inputs clock pulses with system logic circuit operating normally. clock pulse within watchdog timer monitor time some problem with system logic circuit, level threshold voltage less MB3793 outputs reset signal (setting RESET level from level). value always about 0.24 regardless detected voltage. watchdog timer monitor time with following equation: (ms) (µF) value hardly affected supply voltage; about 1500 with When certain period time passed (until voltage reaches exceeds again after recharging CTP), MB3793 cancels reset signal starts operating watchdog timer. watchdog timer monitor reset time with following equation: (ms) (µF) value about with MB3793 repeats operations long CK1/CK2 inputs clock pulses. clock pulse input, MB3793 repeats operations (7). lowered fall-time detected voltage (VSL) less, voltage decreases MB3793 outputs reset signal (setting RESET level from level). value When reaches exceeds again, MB3793 starts charging (10) When voltage reaches exceeds Vth, MB3793 cancels reset restarts operating watchdog timer. repeats operations long CK1/CK2 inputs clock pulses. (11) Making inhibit active (setting from "L") forces watchdog timer stop operation. This stops only watchdog timer, leaving MB3793 monitoring (operations (10)). watchdog timer remains inactive unless inhibit input canceled. (12) Canceling inhibit input (setting from "H") restarts watchdog timer. (13) reset signal output when power supply turned less.
MB3793-37A
TYPICAL CHARACTERISTICS
Power supply current-Power supply voltage
Detection voltage: Power supply current: (µA) MB3793-37A VINH Duty 0.01 Power supply voltage: Watchdog timer monitoring (VINH
Detection voltage-Ambient temperature
-40°C +85°C +25°C)
+25°C) -40°C +85°C)
Ambient temperature: (°C)
Reset output voltage-Reset output current (P-MOS side)
Reset output voltage-Reset output current (N-MOS side)
Reset output voltage: VRESET
+25°C +85°C VRESET IRESET -40°C 4.800 +25°C 4.750 +85°C 4.707 58.6
Reset output voltage: VRESET (mV)
-40°C
VRESET IRESET -40°C 19.6 +25°C +85°C 33.4
+25°C +85°C
-40°C Reset output current: IRESET (mA)
Reset output current: IRESET (mA)
(Continued)
MB3793-37A
Reset output voltage-Power supply voltage
Pull-up resistance: Reset output voltage: VRESET +85°C +25°C -40°C Power supply voltage:
Reset-on reset time-Ambient temperature (when rising)
Power-on reset time: (ms) +25°C -40°C +85°C
Ambient temperature: (°C)
Watchdog timer reset time-Ambient temperature (when monitoring)
Watchdog timer reset time: (ms) +25°C -40°C +85°C Watchdog timer monitoring time: (ms)
Watchdog timer monitoring time-Ambient temperature
+25°C -40°C +85°C
Ambient temperature: (°C)
Ambient temperature: (°C)
(Continued)
MB3793-37A
(Continued)
Power-on reset time-CTP capacitance Reset time-CTP capacitance
Power-on reset time: (ms)
Reset time: (ms)
-40°C
-40°C
+25°C 10-4 +85°C
+25°C +85°C
10-3
10-2
10-1
10-2 10-4
10-3
10-2
10-1
Power-on reset time setting capacitance: (µF)
Power-on reset time setting capacitance: (µF)
Watchdog-timer monitoring time-CTW capacitance
Watchdog-timer monitoring time: (ms)
-40°C
+25°C
+85°C
10-5
10-4
10-3
10-2
10-1
Watchdog-timer monitoring time setting capacitance: (µF)
MB3793-37A
APPLICATION EXAMPLE
Supply voltage monitor watchdog timer (1-clock monitor)
RESET
RESET CTW* CTP*
Microprocessor
capacitor with less leakage current. MB3793 monitors clock (CK1/2) every other input pulse.
Supply voltage monitor watchdog timer stop
RESET RESET RESET
CTW* CTP*
Microprocessor
Microprocessor
HALT
HALT
capacitor with less leakage current.
MB3793-37A
TYPICAL APPLICATION
RESET RESET MB3793 CTW* CTP* RESET
Microprocessor
Microprocessor
capacitor with less leakage current.
Equation time-setting capacitances (CTP CTW) time
[ms] [µF] [ms] [µF] [µF] However, when about [ms] [µF] [ms] [µF] Values 1300 1500 Remark
(Example) when 0.01
time (msec)
MB3793-37A
ORDERING INFORMATION
Part number MB3793-37PF MB3793-37PNF Package 8-pin Plastic (FPT-8P-M01) 8-pin Plastic (FPT-8P-M02) Remarks
MB3793-37A
PACKAGE DIMENSIONS
8-pin Plastic (FPT-8P-M01)
6.35 -0.20 .250 -.008
+0.25
+.010
2.25(.089)MAX (Mounting height) 0.05(.002)MIN (STAND OFF)
INDEX
5.30±0.30 (.209±.012)
7.80±0.40 (.307±.016)
6.80 -0.20 .268 -.008
+0.40 +.016
1.27(.050) 3.81(.150)REF
0.45±0.10 (.018±.004)
0.15 -0.02 .006 -.001
+0.05 +.002
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 (inches)
(Continued)
MB3793-37A
(Continued)
8-pin Plastic (FPT-8P-M02)
5.05 -0.20 .199 -.008
+0.25
+.010
1.55±0.20(.061±.008) (Mounting height)
0.15±0.10 (STAND OFF) (.006±.004) 3.90±0.30 (.154±.012) 6.00±0.40 (.236±.016) 5.00±0.30 (.197±.012)
0.40(.016) 1.27(.050)TYP 0.42±0.10 (.017±.004)
0.20±0.05 (.008±.002) Details part
0.50±.020 (.020±.008)
0.40(.016)
3.81(.150)REF
0.10(.004)
0.20(.008) 0.18(.007)MAX 0.65(.026)MAX
1994 FUJITSU LIMITED F08004S-2C-4
Dimensions (inches)
MB3793-37A
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: 81(44) 754-3763 Fax: 81(44) 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 inherent chance 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 Japan, prior authorization Japanese government will required export those products from Japan.
http://www.fujitsu.co.jp/
North South America FUJITSU MICROELECTRONICS, INC. Semiconductor Division 3545 North First Street Jose, 95134-1804, Tel: (408) 922-9000 Fax: (408) 922-9179 Customer Response Center Mon. Fri.: (PST) Tel: (800) 866-8608 Fax: (408) 922-9179
http://www.fujitsumicro.com/
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http://www.fujitsu-ede.com/
Asia Pacific FUJITSU MICROELECTRONICS ASIA #05-08, Lorong Chuan Tech Park Singapore 556741 Tel: (65) 281-0770 Fax: (65) 281-0220
http://www.fmap.com.sg/
F9901 FUJITSU LIMITED Printed Japan
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