MB3771PF Fujitsu Microelectronics, Inc., MB3771PF Datasheet - Page 14

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

14
MB3771
13. Back-up Power Supply System (V
• Use CMOS Logic and connect V
• The back-up battery works after CS goes high as V
• During t
• CS‘s threshold voltage V
• The voltage to change V
V
V
When V
When V
V
However, please set V
CC
C
1
2
T
= V
= V
F
F
*: Diode has been added to prevent Comp.C from malfunctionig when V
+ (R
+ (R
PO
1
1
is 4.45 V or less, connect 7 pin with V
is 4.45 V or more, 7 pin can be used to open.
Set V
characteristics).
, memory access is prohibited.
1
1
1
2
3
4
+ R
+ R
1
MB3771
and V
2
2
+ R
+ R
2
2
3
3
)
)
to 3.5 V or more.
with care given to V
R
2
1
8
7
6
5
3
is determined by the following equation:
is provided as the following equation:
: 56 k
V
V
SB
SC
/R
/ (R
3
DD
2
V
V
CS
CCO
of CMOS logic with V
+ R
CC
R
R
D
V
V
V
1
1
2
F
1
2
: 100 k
: 6.2 k
CC
3
)
0.6 V
= 5 V)
F
temperature characteristics (typically negative temperature
CC
.
R
R
R
4
5
6
2
>1 k
: 100 k
: 100 k
< V
1
CCO
.
.
T
t
t
t
PO
CC
voltage is low.
V
CS
CCO