CMX615D4 CML Microcircuits, CMX615D4 Datasheet - Page 24

• Manufacturer Part Number: CMX615D4
• Description: Digital Line to POTS Interface
• Manufacturer: CML Microcircuits

Digital Line to POTS Interface
Note: These timings are for the latest version of the ‘C-BUS’ as embodied in the CMX615, and allow faster
transfers than the original ‘C-BUS’ timings given in CML Publication D/800/Sys/3 July 1994.
‘C-BUS’ Timings (See Figure 8)
Typical UART Timings (See Figure 3a and 3b)
T
T
T
T
1999 Consumer Microcircuits Limited
t
t
t
t
t
t
t
t
t
t
t
t
t
FSK
DLY
DRDY
UFL
CDH
RDS
RDH
CSE
CSH
LOZ
HIZ
CSOFF
NXT
CK
CH
CL
CDS
(delay through the modulator)
(3/4 bit-period)
Command Data Hold time
Reply Data Set-Up time
Reply Data Hold time
CSN-Enable to Clock-High time
Last Clock-High to CSN-High time
Clock-Low to Reply Output enable time
CSN-High to Reply Output 3-state time
CSN-High Time between transactions
Inter-Byte Time
Clock-Cycle time
Serial Clock-High time
Serial Clock-Low time
Command Data Set-Up time
(1 bit-period)
(1/4 bit-period)
Figure 8 ‘C-BUS’ Timing
24
Notes
Notes
Min.
Min.
100
100
500
500
200
200
0.0
1.0
75
25
75
0
-
-
-
-
-
Typ.
Typ.
106
833
208
625
-
-
-
-
-
-
-
-
-
-
-
-
-
Max.
Max.
1.0
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
CMX615
D/615/4
Unit
Unit
ns
ns
ns
µs
µs
ns
ns
ns
ns
ns
ns
ns
ns
µs
µs
µs
µs