W78E365/W78E365A
7.3 A.C. Characteristics
The AC specifications are a function of the particular process used to manufacture the part, the
ratings of the I/O buffers, the capacitive load, and the internal routing capacitance. Most of the
specifications can be expressed in terms of multiple input clock periods (TCP), and actual parts will
usually experience less than a ±20 nS variation.
Clock Input Waveform
XTAL1
T
CH
T
CL
F
T
CP
OP,
PARAMETER
Operating Speed
Clock Period
SYMBOL
FOP
MIN.
0
TYP.
MAX.
UNIT
MHz
nS
NOTES
-
-
-
-
40
-
1
2
3
3
TCP
25
20
20
Clock High
TCH
-
nS
Clock Low
TCL
-
nS
Notes:
1. The clock may be stopped indefinitely in either state.
2. The TCP specification is used as a reference in other specifications.
3. There are no duty cycle requirements on the XTAL1 input.
Publication Release Date: January 10, 2007
Revision A9
- 29 -
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