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參數(shù)資料
| 型號： | MB3793 |
| 廠商： | Fujitsu Limited |
| 英文描述： | POWER-VOLTAGE MONITORING IC WITH WATCHDOG TIMER |
| 中文描述： | 電源電壓監(jiān)測芯片，帶有看門狗定時器 |
| 文件頁數(shù)： | 11/20頁 |
| 文件大?。?/td> | 192K |
| 代理商： | MB3793 |
11
MB3793
-42/30
(7) When the voltage of the CTP pin exceeds V
th
again as a result of recharging C
TP
, resetting is canceled and the watchdog timer restarts
monitoring.
The watchdog timer reset time (t
WR
) can be calculated by the following equation.
t
WR
(ms)
≈
D x C
TP
(
μ
F)
Where, D is about 100 in the MB3793-42 and 55 in the MB3793-30.
(8) When V
CC
falls below the rising-edge detection voltage (V
SL
), the voltage of the CTP pin falls and a reset signal is output, and the
voltage at the RESET pin changes to Low level. V
SL
is about 4.2 V in the MB3793-42 and 3.0 V in the MB3793-30.
(9) When V
CC
exceeds V
SH
, C
TP
begins charging.
(10) When the voltage of the CTP pin exceeds V
th
, resetting is canceled and the watchdog timer restarts.
(11) When an inhibition signal is input (INH pin is High level), the watchdog timer is halted forcibly.
In this case, V
CC
monitoring is continued ((8) - (9)) without the watchdog timer.
The watchdog timer does not function unless this inhibition input is canceled.
(12) When the inhibition input is canceled (INH pin is Low level), the watchdog timer restarts.
(13) When the V
CC
voltage falls below V
SL
after power-off, a reset signal is output.
Similar operation is also performed for negative clock-pulse input (Timing Chart 2).
Short-circuit the clock pins CK1 and CK2 to monitor a single clock. The basic operation is the same but the clock pulses are monitored at every
other pulse (Timing Chart 3).
I
ABSOLUTE MAXIMUM RATINGS
*The power voltage is based on the ground voltage (0 V).
Note: Permanent device damage may occur if the above ABSOLUTE MAXIMUM RATINGS are exceeded. Functional operation should be
restricted to the conditions as detailed in the operational sections of this data sheet. Exposure to absolute maximum rating conditions
for extended periods may affect device reliability.
I
RECOMMENDED OPERATING CONDITIONS
Note: These recommended operation conditions guarantee normal logic operation of an LSI circuit. The limits of the AC and DC electrical
characteristics are guaranteed within these recommended conditions.
(Ta = +25
°
C)
Parameter
Symbol
LImits
Symbo
Power voltage*
V
CC
-0.3 to +7
V
Input voltage
CK1
V
CK1
-0.3 to +7
V
CK2
V
CK2
INH
V
INH
Reset output voltage
(direct current)
RESET
I
OL
I
OH
-10 to +10
mA
Allowable loss (Ta
≤
+85
°
C)
P
D
200
mW
Storage temperature
Tstg
-55 to +125
°
C
Parameter
Symbol
Limits
Unit
Min.
Typical
Max.
Reset (RESET) output current
I
OL
I
OH
-5
-
+5
mA
Power-on reset hold time setting capacity
C
TP
0.001
-
10
μ
F
Watchdog-timer monitoring time setting capacity
C
TW
0.001
-
1
μ
F
Watchdog timer monitoring time
t
WD
0.1
-
1500
ms
Operating ambient temperature
Ta
-40
-
+85
°
C
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