MB3793-37APNF-G-JN-ER6 Fujitsu Semiconductor America Inc, MB3793-37APNF-G-JN-ER6 Datasheet - Page 11
![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
5. Clock pulse input supplementation (Positive clock pulse)
1. Positive clock pulse input
See “1. Basic operation (positive clock pulse)” under “ DIAGRAM.”
2. Negative clock pulse input
See “2. Basic operation (negative clock pulse)” under “ 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 “ DIAGRAM.”
4. Description of Operations
The numbers given to the following items correspond to numbers (1) to (13) used in “ DIAGRAM.”
OPERATION SEQUENCE
(1) The MB3793 outputs a reset signal when the supply voltage (V
(2) If V
Note: The MB3793 watchdog timer monitors Clock1 (CK1) and Clock2 (CK2) pulses alternately.
reset hold time setting capacitor C
3.79 V.
CC
CTW
When a CK2 pulse is detected after detecting a CK1 pulse, the monitoring time setting
capacity (C
When two consecutive pulses occur on one side of this alternation before switching,
the second pulse is ignored.
In the above figure, pulse *1 and *2 are ignored.
CK1
CK2
reaches or exceeds the rise-time detected voltage V
V
V
H
L
TW
) switches to charging from discharging.
TP
. At this time, the output remains in a reset state. The V
*1
*2
SH
, the MB3793 starts charging the power-on
CC
) reaches about 0.8 V (V
MB3793
SH
CCL
value is about
)
-37A
11