IA186EB/IA188EB
Data Sheet
8-Bit/16-Bit Microcontrollers
July 10, 2011
5.2
Clock Input and Clock Output Timing Characteristics
For clock input and clock output timing characteristics for both 5.0- and 3.3-volt operation, see
Tables 18 and 19, respectively.
Figure 16. Clock Input and Clock Output Timing Characteristics
Table 18. Clock Input and Clock Output Timing Characteristics for 5.0-Volt Operation
Item
–
Symbol
XTF
Parameter
clkin
Frequency
clkin Period
Min
0
Max
50
Units
MHz
Notes
–
–
1
2
TCKIN
20
10
∞
∞
ns
ns
TCHCK
clkin High
Time
Measure for VIH for high time, NIL for
low time.
3
4
TCLCK
TCKLH
clkin Low
Time
clkin Rise
Time
10
1
∞
ns
ns
Measure for VIH for high time, NIL for
low time.
Only required to guarantee ICC.
Maximum limits are bounded for TC,
TCH, and TCL.
5
5
6
TCKHL
TCICO
clkin Fall
Time
1
5
ns
Only required to guarantee ICC.
Maximum limits are bounded for TC,
TCH, and TCL.
clkin to clkout
Delay
clkout Period
clkout High (TCLCL/2) (TCLCL/2) ns
Time – 5 + 5
clkout Low (TCLCL/2) (TCLCL/2) ns
Time
clkout Rise
Time
0
11.5
ns
ns
Specified for a 50-pF load.
7
8
TCLCL
TCHCL
–
2TCKIN
–
Measure for VIH for high time, NIL for
low time.
Measure for VIH for high time, NIL for
low time.
9
TCCCH
– 5
1
+ 5
6
10 TCH1CH2
11 TCL2CL1
ns
ns
Specified for a 50-pF load.
clkout Fall
Time
1
6
Specified for a 50-pF load.
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