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GMS81C5108
JUNE 2001 Ver 1.0
15
7.7 Serial I/O Characteristics
(TA=25
°
C, V
DD
=AV
DD
=2~4V, V
SS
=AV
SS
=0V)
Figure 7-2 Serial I/O Timing Chart
Parameter
Symbol
Pins
Specifications
Unit
Min.
Typ.
Max.
SCK Input Clock Pulse Period
t
SCYC
SCK
2t
SYS
+200
-
-
nS
SCK Input Clock “H” or “L” Pulse Width
t
SCKW
t
SYS
+70
-
-
SCK Output Clock Cycle Time
t
SCYC
4t
SYS
-
16t
SYS
SCK output Clock “H” or “L” Pulse Width
t
SCKW
2t
SYS
-30
-
-
SCK output Clock Delay Time
t
DS
-
-
100
SI input Setup Time (External SCK)
t
ESUS
SI
100
-
-
SI input Setup Time (Internal SCK)
t
ISUS
100
-
-
SI input Hold Time
t
HS
t
SYS
+100
-
-
SCK
t
SCKW
0.2V
DD
t
SCKW
t
SCYC
0.8V
DD
t
DS
t
SUS
t
HS
0.2V
DD
0.8V
DD
0.2V
DD
0.8V
DD
SO
SI
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