Low Power V.22 bis Modem
CMX868
C-BUS Timings (See Figure 15)
Notes
Min.
Typ.
Max.
Units
tCSE
tCSH
tLOZ
CSN-Enable to Clock-High time
100
–
–
ns
Last Clock-High to CSN-High time
100
0.0
–
–
–
–
ns
ns
Clock-Low to Reply Output enable
time
tHIZ
CSN-High to Reply Output 3-state
time
–
–
1.0
µs
tCSOFF
tNXT
tCK
CSN-High Time between transactions
Inter-Byte Time
1.0
200
200
100
100
75.0
25.0
50.0
0.0
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
µs
ns
ns
ns
ns
ns
ns
ns
ns
Clock-Cycle time
tCH
Serial Clock-High time
Serial Clock-Low time
Command Data Set-Up time
Command Data Hold time
Reply Data Set-Up time
Reply Data Hold time
tCL
tCDS
tCDH
tRDS
tRDH
Maximum 30pF load on each C-BUS interface line.
Note: These timings are for the latest version of the C-BUS as embodied in the CMX868.
Figure 15 C-BUS Timing
ã 2004 CML Microsystems Plc
46
D/868/9
CMLMICRO [ CML MICROCIRCUITS ]
