Data Sheet

NUC123
May 3, 2017 Page 71 of 99 Rev.2.04
NUC123 SERIES DATASHEET
AC Electrical Characteristics 7.3
7.3.1 External 4~24 MHz High Speed Oscillator
t
CHCX
90%
10%
t
CLCH
t
CHCL
t
CLCX
t
CLCL
0.3 V
DD
0.7 V
DD
Note: Duty cycle is 50%.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
t
CHCX
Clock High Time
10
-
-
nS
t
CLCX
Clock Low Time
10
-
-
nS
t
CLCH
Clock Rise Time
2
-
15
nS
t
CHCL
Clock Fall Time
2
-
15
nS
7.3.2 External 4~24 MHz High Speed Crystal
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
Input clock frequency
External crystal
4
12
24
MHz
Temperature
-
-40
-
85
℃
V
DD
-
2.5
5
5.5
V
Typical Crystal Application Circuits 7.3.2.1
CRYSTAL
C1
C2
R
4 MHz ~ 24 MHz
10~20pF
10~20pF
without
XT1_INXT1_OUT
C1
R
C2
Figure 7-1 Typical Crystal Application Circuit