RA4803SA
Page - 25
ETM38E-03
8.7. V
DD
and CE timing
* When the power is turned to ON, use with CE
=
"
L
"
(
V
CL
[V] in the diagram
)
as illustrated in the following
timing chart.
V
DD
1.6 V
V
CL
t
CL
CE
Item
Symbol
Remark
Specification
Unit
CE voltage when power is
turned to ON
V
CL
CE impressed voltage
until V
DD
=
1.6 V
0.3 (Max.)
V
CE=V
CL
[V] time when power
is turned to ON
t
CL
Time to maintain CE=V
CL
[V]
until V
DD
=
1.6 V
30
(
Min.
)
ms
8.8. Backup and Recovery
V
DD
t
F
t
R2
Back up
t
R1
V
CLK
0 V
V
DET
Item
Symbol
Condition
Min.
Typ.
Max.
Unit.
Power supply
detection voltage ( 1 )
V
DET
−
2.2
V
Power supply
detection voltage ( 2 )
V
LOW
−
1.6
V
Power supply
drop time
t
F
−
2
µ
s /V
Initial power-up time
t
R1
−
10
ms /V
Clock maintenance
power-up time
t
R2
1.6V
→
V
DD
≤
3.6V
5
µ
s /V
1.6V
→
V
DD
>
3.6V
15
µ
s /V
Please control a power supply in the above agreement so that normalcy operates a detect circuit of power supply injection.
Please start a power supply at 0V by all means.
Before power supply change operation and a shift to backup state ,please set a CE terminal at a Low level
