DS87C520_1 Datasheet, PDF (31/42 Pages) Dallas Semiconductor – EPROM/ROM High-Speed Micro

EXTERNAL CLOCK CHARACTERISTICS
PARAMETER
SYMBOL MIN
Clock High Time
Clock Low Time
Clock Rise Time
Clock Fall Time
t_CHCX
10
t_CLCX
10
t_CLCL
t_CHCL
TYP
DS87C520/DS83C520
MAX
5
5
UNITS
ns
ns
ns
ns
NOTES
SERIAL PORT MODE 0 TIMING CHARACTERISTICS
PARAMETER
SYMBOL MIN
TYP
Serial Port Clock Cycle Time
SM2=0, 12 clocks per cycle
SM2=1, 4 clocks per cycle
Output Data Setup to Clock Rising
SM2=0, 12 clocks per cycle
SM2=1, 4 clocks per cycle
Output Data Hold from Clock Rising
SM2=0, 12 clocks per cycle
SM2=1, 4 clocks per cycle
Input Data Hold after Clock Rising
SM2=0, 12 clocks per cycle
SM2=1, 4 clocks per cycle
Clock Rising Edge to Input Data
Valid
SM2=0, 12 clocks per cycle
SM2=1, 4 clocks per cycle
t_XLXL
t_QVXH
t_XHQX
t_XHDX
t_XHDV
12t_CLCL
4t_CLCL
10t_CLCL
3t_CLCL
2t_CLCL
t_CLCL
t_CLCL
t_CLCL
11t_CLCL
3t_CLCL
MAX
UNITS
ns
ns
NOTES
ns
ns
ns
ns
ns
ns
ns
ns
EXPLANATION OF AC SYMBOLS
In an effort to remain compatible with the original 8051 family, this device specifies the same parameters
as such devices, using the same symbols. For completeness, the following is an explanation of the
symbols.
t
Time
A Address
C Clock
D Input data
H Logic level high
L Logic level low
I
Instruction
P
PSEN
Q Output data
R
RD signal
V Valid
W WR signal
X No longer a valid logic level
Z Tristate
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