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PDF MB3793-27A Data sheet ( Hoja de datos )
| Número de pieza | MB3793-27A | |
| Descripción | Power Voltage Monitoring IC with Watchdog Timer | |
| Fabricantes | Fujitsu Media Devices | |
| Logotipo |  |
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FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27404-2E
ASSP For Power Supply Applications
BIPOLAR
Power Voltage Monitoring IC
with Watchdog Timer
MB3793-27A
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 fall-safe function for various application systems.
There is also a mask option that can detect voltages of 4.9 to 2.4 V in 0.1-V steps.
s FEATURES
• Precise detection of power voltage fall: ±2.5%
• Detection voltage with hysteresis
• Low power dispersion: ICC = 31 µA (referenDcaet)aSheet4U.com
• Internal dual-input watchdog timer
• Watchdog-timer halt function (by inhibition pin)
• Independently-set wacthdog and reset times
DataShee
s PACKAGE
8-pin, Plastic SOP
8-pin, Plastic SOP
(FPT-8P-M01)
8-pin, Plastic SSOP
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(FPT-8P-M03)
(FPT-8P-M02)
8-pin, Plastic DIP
(DIT-8P-M01)
1 page  
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MB3793-27A
s ABSOLUTE MAXIMUM RATINGS
Parameter
Power supply voltage*
Input voltage*
Reset output current
Power dissipation
Storage temperature
Symbol
CK1
CK2
INH
RESET
VCC
VCK1
VCK2
IINH
IOL
IOH
PD
Tstg
Conditions
—
—
—
—
—
Ta ≤ +85°C
—
Rating
Min Max
–0.3
+7
–0.3
+7
–10 +10
— 200
–55 +125
(Ta = +25°C)
Unit
V
V
mA
mW
°C
*: The 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
Power supply voltage
Reset (RESET) output current
Power-on reset hold time setting
capacity
Watchdog-timer monitoring time
setting capacity*
Operating temperature
Symbol Conditions
DataSheet4U.com
VCC —
IOL
IOH
—
CTP —
Min
1.2
–5
0.001
CTW — 0.001
Ta — –40
Value
Typ
—
—
—
—
—
Max
6.0
+5
10
1
+85
Unit
V
mA
µF
µF
°C
*: The watchdog timer monitor time range depends on the rating of the setting capacitor.
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.
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5. Clock pulse input supplementation (Positive clock pulse)
MB3793-27A
CK1
*1
CK2
*2
et4U.com
VH
CTW
VL
Note : The MB3793 watchdog timer monitors Clock1 (CK1) and Clock2 (CK2) pulses alternately.
When a CK2 pulse is detected after detecting a CK1 pulse, the monitoring time setting capacity (CTW)
switches to charging from discharging.
When two consecutive pulses occur on one side of this alternation before switching, the second pulse
is ignored.
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In the above figure, pulse *1 and *2 are ignored.
DataShee
s OPERATION SEQUENCE
1. Positive clock pulse input
See “1. Basic operation (positive clock pulse)” under “s DIAGRAM.”
2. Negative clock pulse input
See “2. Basic operation (negative clock pulse)” under “s DIAGRAM.”
The MB3793 operates in the same way whether it inputs positive or negative pulses.
3. Clock monitoring
To use the MB3793 while monitoring only one clock, connect clock pins CK1 and CK2.
Although the MB3793 operates basically in the same way as when monitoring two clocks, it monitors the clock
signal at every other input pulse.
See “3. Single-clock input monitoring (positive clock pulse)” under “s DIAGRAM.”
4. Description of Operations
The numbers given to the following items correspond to numbers (1) to (13) used in “s DIAGRAM.”
(1) The MB3793 outputs a reset signal when the supply voltage (VCC) reaches about 0.8 V (VCCL)
(2) If VCC reaches or exceeds the rise-time detected voltage VSH, the MB3793 starts charging the power-on
reset hold time setting capacitor CTP. At this time, the output remains in a reset state. The VSH value is about
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