Telephone Signalling Transceiver / Least Cost Router
CMX860
'C-BUS' Timings (See Figure 13)
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 CMX860, and allow
faster transfers than the original 'C-BUS' timings given in CML Publication D/800/Sys/3 July 1994.
Figure 13 'C-BUS' Timing
ã 2002 Consumer Microcircuits Limited
42
D/860/5
CMLMICRO [ CML MICROCIRCUITS ]
