MB3793-37APNF-G-JN-ER6 Fujitsu Semiconductor America Inc, MB3793-37APNF-G-JN-ER6 Datasheet - Page 12
![no-image](/images/no-image-200.jpg)
MB3793-37APNF-G-JN-ER6
Manufacturer Part Number
MB3793-37APNF-G-JN-ER6
Description
IC PWR VOLT MON 37A WD 8SOP
Manufacturer
Fujitsu Semiconductor America Inc
Type
Simple Reset/Power-On Resetr
Datasheet
1.MB3793-37APNF-G-JN-6E1.pdf
(21 pages)
Specifications of MB3793-37APNF-G-JN-ER6
Number Of Voltages Monitored
1
Output
CMOS Inverted
Reset
Active Low
Reset Timeout
80 ms Minimum
Voltage - Threshold
3.7V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOP
Lead Free Status / RoHS Status
Lead free / RoHS non-compliant
Other names
Q4927259A
12
MB3793
(3) When C
(4) When the voltage at the watchdog timer monitor time setting pin C
(5) If the CK2 pin inputs a clock pulse (positive edge trigger) when the C
(6) If no clock pulse is fed to the CK1 or CK2 pin within the watchdog timer monitor time t
(7) When a certain period of time t
(8) If V
(9) When V
(10) When the CTP pin voltage reaches or exceeds V
(11) Making the inhibit pin active (setting the INH pin to “H” from “L”) forces the watchdog timer to stop operation.
(12) Canceling the inhibit input (setting the INH pin to “L” from “H”) restarts the watchdog timer.
(13) The reset signal is output when the power supply is turned off to set V
voltage (V
from “L” level).
The V
The power-on reset hold timer monitor time t
t
The value of A is about 1300 with V
time setting capacitor (C
V
The value of V
order or simultaneously, the C
The MB3793 repeats operations (4) and (5) as long as the CK1/CK2 pin inputs clock pulses with the system
logic circuit operating normally.
with the system logic circuit, the CTW pin is set to the “L” level threshold voltage V
outputs a reset signal (setting the RESET pin to “L” level from “H” level).
The value of V
The watchdog timer monitor time t
t
The value of B is hardly affected by the supply voltage; it is about 1500 with V
recharging the C
The watchdog timer monitor reset time t
t
The value of D is about 100 with V
The MB3793 repeats operations (4) and (5) as long as the CK1/CK2 pin inputs clock pulses. If no clock
pulse is input, the MB3793 repeats operations (6) and (7).
MB3793 outputs a reset signal (setting the RESET pin to “L” level from “H” level).
The value of V
the watchdog timer. It repeats operations (4) and (5) as long as the CK1/CK2 pin inputs clock pulses.
This stops only the watchdog timer, leaving the MB3793 monitoring V
The watchdog timer remains inactive unless the inhibit input is canceled.
PR
WD
WR
H
, the C
(ms)
(ms)
(ms)
CC
is lowered to the fall-time detected voltage (V
th
value is about 3.6 V with V
TP
CC
.
. =
.
. =
.
. =
TW
-37A
has been charged for a certain period of time T
th
A
reaches or exceeds V
B
D x C
) after the start of charging), the MB3793 cancels the reset (setting the RESET pin to “H” level
switches from the charge state to the discharge state.
C
H
L
SL
C
is always about 0.24 V regardless of the detected voltage.
TP
is always about 1.24 V regardless of the detected voltage.
TW
TP
TP
is 3.7 V
( F)
), the MB3793 cancels the reset signal and starts operating the watchdog timer.
( F)
( F)
TW
).
TW
WR
SH
switches from the discharge state to the charge state.
has passed (until the CTP pin voltage reaches or exceeds Vth again after
CC
WD
CC
CC
again, the MB3793 starts charging the C
= 5.0 V. The MB3793 also starts charging the watchdog timer monitor
= 5.0 V
is set with the following equation:
= 5.0 V.
WR
is set with the following equation:
PR
is set with the following equation:
th
, the MB3793 cancels the reset and restarts operating
SL
) or less, the CTP pin voltage decreases and the
PR
(until the CTP pin voltage exceeds the threshold
TW
reaches the “H” level threshold voltage
TW
CC
is being discharged in the CK1-CK2
CC
(operations (8) to (10)).
to V
TP
SL
.
CC
or less.
= 5.0 V.
L
or less and the MB3793
WD
due to some problem