7.0 SERIAL PORT TIMING CHARACTERISTICS
(V = 5.0V ±10%; -55°C < T < +125°C)
DD
C
SYMBOL
PARAMETER
MINIMUM
12 t -10
MAXIMUM
12 t +10
UNIT
1
Serial Port Clock Period
ns
CLCL
CLCL
t
XLXL
t
Output Data Setup to Clock Rising Edge
Output Data Hold after Clock Rising Edge
Input Data Hold after Clock Rising Edge
10 t
2 t
-133
-70
ns
ns
ns
QVXH
XHQX
CLCL
t
CLCL
1
0
t
XHDX
t
Clock Rising Edge to Input Data Valid
10 t
-133
ns
XHDV
CLCL
Note:
1. Guaranteed, but not tested.
0
1
2
3
4
5
6
7
8
ALE
TXLXL
CLOCK
TXHQX
TQVXH
OUTPUT DATA
0
1
2
3
4
5
6
7
(WRITE TO SBUF)
TXHDX
SET TI
TXHDV
INPUT DATA
VALID
VALID
VALID
VALID
VA LID
VALID
VALID
VA LID
(CLEAR RI)
SET RI
Figure 9. Serial Port Timing Waveforms
8.0 EXTERNAL CLOCK DRIVE TIMING CHARACTERISTICS
SYMBOL PARAMETER
Oscillator Frequency
MINIMUM
MAXIMUM
UNIT
1/t
20
MHz
CLCL
t
High Time
Low Time
Rise Time
Fall Time
16
16
ns
ns
ns
ns
CHCX
t
t
t
CLCX
CLCH
CHCL
20
20
Note:
1. Guaranteed, but not tested.
VDD - 0.5
0.7 VDD
0.2 VDD - 0.1
0.45 V
tCHCX
tCHCX
tCHCL
tCLCH
tCLCL
Figure 10. External Clock Drive Timing Waveforms
12
AEROFLEX [ AEROFLEX CIRCUIT TECHNOLOGY ]
