![](http://datasheet.mmic.net.cn/330000/MB90435_datasheet_16437443/MB90435_36.png)
MB90435 Series
36
(2) Clock Output Timing
(MB90F438L (S) /437L (S) /438L (S) : V
CC
=
3.5 V to 5.5 V, V
SS
=
AV
SS
=
0.0 V, T
A
=
40
°
C to
+
105
°
C)
(MB90F439 (S) /439 (S) /V540G : V
CC
=
5.0 V
±
10
%
, V
SS
=
AV
SS
=
0.0 V, T
A
=
40
°
C to
+
105
°
C)
(3) Reset and Hardware Standby Input Timing
(MB90F438L (S) /437L (S) /438L (S) : V
CC
=
3.5 V to 5.5 V, V
SS
=
AV
SS
=
0.0 V, T
A
=
40
°
C to
+
105
°
C)
(MB90F439 (S) /439 (S) /V540G : V
CC
=
5.0 V
±
10
%
, V
SS
=
AV
SS
=
0.0 V, T
A
=
40
°
C to
+
105
°
C)
“t
cp
” represents one cycle time of the machine clock.
Oscillation time of oscillator is time that amplitude reached the 90
%
. In the crystal oscillator, the oscillation time is
between several ms to tens of ms. In FAR/ceramic oscillator, the oscillation time is between handreds of
μ
s to
several ms. In the external clock, the oscillation time is 0 ns.
Any reset can not fully initialize the Flash Memory if it is performing the automatic algorithm.
Parameter
Symbol
Pin name
Condition
Value
Units
Remarks
Min
Max
Cycle time
CLK
↑
→
CLK
↓
t
CYC
CLK
V
CC
=
5 V
±
10
%
62.5
ns
t
CHCL
20
ns
Parameter
Symbol
Pin
name
Value
Units
Remarks
Min
Max
Reset input time
t
RSTL
RST
4 t
CP
ns
Under normal operation
Oscillation time of
oscillator
+
4 t
CP
ms
In stop mode
100
μ
s
Pseudo timer mode
(MB90437L (S) /438L (S) )
4 t
CP
ns
Pseudo timer mode
(Other than MB90437L (S)
/438L (S) )
2 t
CP
μ
s
In sub clock mode, sub
sleep mode and watch
mode
Hardware standby input time
t
HSTL
HST
4 t
CP
ns
Under normal operation
CLK
t
CYC
2.4 V
2.4 V
0.8 V
t
CHCL