MB3793-27APNF-G-JN-ER6E1 Fujitsu Semiconductor America Inc, MB3793-27APNF-G-JN-ER6E1 Datasheet - Page 11

• Manufacturer Part Number: MB3793-27APNF-G-JN-ER6E1
• Description: IC PWR VOLT MON 27A WD 8SOP
• Manufacturer: Fujitsu Semiconductor America Inc
• Type: Simple Reset/Power-On Resetr

Specifications of MB3793-27APNF-G-JN-ER6E1

• Number Of Voltages Monitored: 1
• Output: CMOS Inverted
• Reset: Active Low
• Reset Timeout: 30 ms Minimum
• Voltage - Threshold: 2.7V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 865-1023-2

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
2.76 V.
When a CK2 pulse is detected after detecting a CK1 pulse, the monitoring time setting capacity (C
switches to charging from discharging.
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.
CC
CTW
CK1
CK2
reaches or exceeds the rise-time detected voltage V
V
V
H
L
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
)
-27A
TW
)
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