V23 / Bell 202 Modem
CMX624
Rx Energy Detector
‘Off’ to 'On' Threshold Level (FSK)
‘Off’ to 'On' Threshold Level (Call Progress)
Hysteresis (measured at V
'Off' to 'On' Time (Figure 4 Teon):
1200bps Rx mode
Notes
6, 10
6, 10
6, 10
6, 10
Min.
-48.0
-48.0
2.0
Typ.
Max.
-43.0
-40.0
-
Unit
dBm
dBm
dB
-
-
-
DD = 3V and 5V)
-
-
-
-
-
-
25
48
48
ms
ms
ms
75/150bps Rx mode
Call Progress Detect mode
'On' to 'Off' Time (Figure 4 Teoff):
1200bps Rx mode
6, 10
8.0
20
20
-
-
-
-
-
-
ms
ms
ms
75/150bps Rx mode
Call Progress Detect mode
Notes:
10. Measured with 1300Hz signal in 1200bps mode, 390Hz for 75 or 150 bps and Call
Progress mode, signal level -33dBm for time delay measurements.
XTAL/CLOCK Input
'High' Pulse Width
'Low' Pulse Width
Notes
11
11
Min.
100
100
Typ.
-
-
Max.
-
-
Unit
ns
ns
Notes:
11. Timing for an external input to the XTAL/CLOCK pin.
‘C-BUS’ Timings (See Figure 10)
Notes
Min.
Typ.
Max.
Unit
t
t
t
t
t
t
t
t
t
t
t
t
t
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
100
-
-
ns
CSE
CSH
LOZ
HIZ
100
0.0
-
-
-
-
-
-
-
-
-
-
-
-
-
-
ns
ns
µs
µs
ns
ns
ns
ns
ns
ns
ns
ns
-
1.0
1.0
200
200
100
100
75
-
-
-
-
-
-
-
-
-
CSOFF
NXT
CK
Clock-Cycle time
Serial Clock-High time
CH
Serial Clock-Low time
CL
Command Data Set-Up time
Command Data Hold time
Reply Data Set-Up time
CDS
CDH
RDS
RDH
25
50
Reply Data Hold time
0
Note: These timings are for the latest version of the ‘C-BUS’ as embodied in the CMX624.
2003 CML Microsystems Plc
22
D/624/7
CMLMICRO [ CML MICROCIRCUITS ]
