MB3771PF Fujitsu Microelectronics, Inc., MB3771PF Datasheet - Page 7

• Manufacturer Part Number: MB3771PF
• Description: Power Supply Monitor
• Manufacturer: Fujitsu Microelectronics, Inc.

1. 5V Power Supply Monitor
2. 5V Power Supply Voltage Monitor (Externally Fine-Tuned Type)
APPLICATION CIRCUIT
Monitored by V
The V
Resistance R
voltage can be set using the ratio between resistance R
• R
V
SAL
1
, R
SA
: = (R
R
2
detection voltage can be adjusted externally.
calculation formula (when R
1
9.1
10
(k )
1 +
R
1
and R
2
SA
)
. Detection threshold voltage is V
V
2
SB
are set sufficiently lower than the IC internal partial voltage resistance, so that the detection
/R
V
2
V
C
CC
CC
[V], V
T
C
SAH
T
R
: = (R
2
1
3.9
3.9
(k )
<< 100 k , R
1 +
1
2
3
4
MB3771
R
2
1
2
3
4
)
MB3771
(V
8
7
6
5
SAL
SB +
2
<<40 k )
8
7
6
5
and V
Detection voltage
V
HYSB
1
and R
) / R
SAH
2
2
R
R
. (See the table below).
[V]
4.37
4.11
1
2
RESET
RESET
Circuit
Logic
: V
circuit
Logic
SAL
(V)
Detection voltage
MB3771
4.47
4.20
: V
SAH
(V)
7