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PDF MB3793-42 Data sheet ( Hoja de datos )
| Número de pieza | MB3793-42 | |
| Descripción | POWER-VOLTAGE MONITORING IC WITH WATCHDOG TIMER | |
| Fabricantes | Fujitsu Media Devices | |
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FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27402-4E
ASSP
POWER-VOLTAGE MONITORING IC
WITH WATCHDOG TIMER
MB3793-42
s DESCRIPTION
The MB3793 is an integrated circuit to monitor power voltage; it incorporates a watchdog timer.
A reset signal is output when the power is cut or falls abruptly. When the power recovers normally after resetting,
a power-on reset signal is output to microprocessor units (MPUs). An internal watchdog timer with two inputs for
system operation diagnosis can provide a fail-safe function for various application systems.
There is also a mask option that can detect voltages of 4.9 to 2.4V in 0.1-V steps.
The model number and package code are as shown below.
Model No.
Package code
Detection voltage
DataShee
MB3793-42
3793-A
DataShee4t.42UV.com
s FEATURES
• Precise detection of power voltage fall: ±2.5%
• Detection voltage with hysteresis
• Low power dispersion: ICC = 27 µA (reference)
• Internal dual-input watchdog timer
• Watchdog timer halt function (by inhibition terminal)
• Independently-set watchdog and reset times
• Mask option for detection voltage (4.9 to 2.4 V, 0.1-V steps)
s PACKAGES
8-pin plastic DIP
8-pin plastic SOP
8-pin plastic SOP
(DIP-8P-M01)
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DataSheet4 U .com
(FPT-8P-M01)
(FPT-8P-M02)
1 page  
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MB3793-42
s ABSOLUTE MAXIMUM RATINGS
Parameter
Power voltage*
CK1
Input voltage*
CK2
INH
Reset output voltage
(direct current)
RESET
Power dissipation (Ta ≤ +85°C)
Storage temperature
Symbol
VCC
VCK1
VCK2
VINH
IOL
IOH
PD
Tstg
Rating
Min Max
−0.3
+7
(Ta = +25°C)
Unit
V
−0.3
+7 V
−10 +10 mA
200 mW
−55
+125
°C
*: The power voltage is based on the ground voltage (0 V).
WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current,
temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings.
et4U.com
s RECOMMENDED OPERATING CONDITIONS
Parameter
DataSheet4U.com
Value
Symbol
Unit
Min Typ Max
Power supply voltage
Reset (RESET) output current
Power-on reset hold time setting capacity
Watchdog timer monitoring time setting capacity
Watchdog timer monitoring time
Operating ambient temperature
VCC 1.2 5.0 6.0 V
IOL
IOH
−5
+5 mA
CTP 0.001 0.1
10 µF
CTW 0.001 0.1
1 µF
tWD
0.1
1500
ms
Ta −40 +25 +85 °C
WARNING: The recommended operating conditions are required in order to ensure the normal operation of the
semiconductor device. All of the device’s electrical characteristics are warranted when the device is
operated within these ranges.
Always use semiconductor devices within their recommended operating condition ranges. Operation
outside these ranges may adversely affect reliability and could result in device failure.
No warranty is made with respect to uses, operating conditions, or combinations not represented on
the data sheet. Users considering application outside the listed conditions are advised to contact their
FUJITSU representatives beforehand.
DataShee
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5
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4. Inhibition operation (Positive clock pulse)
VSH
VSL
VCC
VCCL
CK1
tCKW
MB3793-42
CK2
et4U.com
INH
Vth
CTP
DataSheet4U.com
VH
CTW
VL
RESET
tPR
tWD tWR
tPR
(1) (2) (3) (4) (5) (5)
(6) (7) (8) (9) (10) (11)
(12) (13) (14)
DataShee
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11
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| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet MB3793-42.PDF ] | |
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