CMX624D5 CML Microcircuits, CMX624D5 Datasheet - Page 22

• Manufacturer Part Number: CMX624D5
• Description: V.23/Bell 202 modem
• Manufacturer: CML Microcircuits

V23 / Bell 202 Modem
Notes:
Notes:
Note: These timings are for the latest version of the ‘C-BUS’ as embodied in the CMX624, and allow faster
transfers than the original ‘C-BUS’ timings given in CML Publication D/800/Sys/3 July 1994.
Rx Energy Detector
XTAL/CLOCK Input
‘C-BUS’ Timings (See Figure 10)
2001 Consumer Microcircuits Limited
‘Off’ to 'On' Threshold Level (FSK)
‘Off’ to 'On' Threshold Level (Call Progress)
Hysteresis (measured at V
'Off' to 'On' Time (Figure 4 Teon):
'On' to 'Off' Time (Figure 4 Teoff):
'High' Pulse Width
'Low' Pulse Width
t
t
t
t
t
t
t
t
t
t
t
t
t
CSE
CSH
LOZ
HIZ
CSOFF
NXT
CK
CH
CL
CDS
CDH
RDS
RDH
1200bps Rx mode
75/150bps Rx mode
Call Progress Detect mode
1200bps Rx mode
75/150bps Rx mode
Call Progress Detect mode
10. Measured with 1300Hz signal in 1200bps mode, 390Hz for 75 or 150 bps and Call Progress
11. Timing for an external input to the XTAL/CLOCK pin.
time
CSN-Enable to Clock-High time
Last Clock-High to CSN-High time
Clock-Low to Reply Output enable
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
Command Data Hold time
Reply Data Set-Up time
Reply Data Hold time
mode, signal level -33dBm for time delay measurements.
DD =
3V and 5V)
22
Notes
Notes
Notes
6, 10
6, 10
6, 10
6, 10
6, 10
11
11
-48.0
-48.0
Min.
Min.
100
100
Min.
100
100
200
200
100
100
2.0
8.0
0.0
1.0
20
20
75
25
50
0
-
-
-
-
Typ.
Typ.
Typ.
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-43.0
-40.0
Max.
Max.
Max.
1.0
25
48
48
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
CMX624
D/624/6
dBm
dBm
Unit
Unit
Unit
ms
ms
ms
ms
ms
ms
dB
ns
ns
ns
ns
ns
µs
µs
ns
ns
ns
ns
ns
ns
ns
ns