V23 / Bell 202 Modem
CMX624
1.7.1.3 Operating Characteristics
For the following conditions unless otherwise specified:
V
DD
= 2.7V at Tamb = 25°C and V = 3.0V to 5.5V at Tamb = -40 to +85°C,
DD
Xtal Frequency = 3.579545MHz ± 0.1%, 0dBm corresponds to 775mVrms.
DC Parameters
(Zero Power mode)
Notes
1, 2
1
Min.
-
-
-
-
-
70%
-
-1.0
Typ.
1.0
3.4
1.8
3.5
1.9
-
Max.
-
6.0
3.2
6.2
3.4
-
Unit
I
µA
mA
mA
mA
mA
DD
(Running, TXON o/p Off, V = 5.0V)
(Running, TXON o/p Off, V = 3.3V)
(Running, TXON o/p On, V = 5.0V)
(Running, TXON o/p On, V = 3.3V)
DD
1
1
1
3
DD
DD
DD
Logic '1' Input Level
Logic '0' Input Level
Logic Input Leakage Current (Vin = 0 to V ),
V
V
DD
3
-
-
30%
+1.0
DD
µA
DD
(excluding XTAL/CLOCK input)
V
-0.4
-
-
-
-
-
-
-
V
V
µA
V
Output Logic '1' Level (l = 360µA)
DD
OH
0.4
1.0
0.56V
+ 0.6V
0.44V
Output Logic '0' Level (l = 360µA)
OL
IRQN O/P 'Off' State Current (Vout = V
Schmitt trigger input high-going threshold (Vthi)
(see Figure 11)
Schmitt trigger input low-going threshold (Vtlo)
(see Figure 11)
)
DD
0.56V
DD
DD
DD
0.44V
- 0.6V
-
-
V
DD
RLYDRV ‘ON’ resistance to V (V = 5.0V)
38.0
TBD
Ω
SS
DD
Notes:
1. At 25°C, not including any current drawn from the CMX624 pins by external circuitry other
than X1, C1 and C2.
2. All logic inputs at V except for RT and CSN inputs which are at V
.
SS
DD
3. Excluding RD, RT and XTAL/CLOCK pins.
FSK Modulator and Tx UART
Level at TOP pin.
Twist (Mark level WRT Space level)
Tx 1200bits/sec (V.23 mode)
Baud Rate (set by UART and Xtal frequency)
Mark (Logical 1) Frequency
Notes
Min.
-4.0
-2.0
Typ.
-3.0
0
Max.
-2.0
+2.0
Unit
dBm
dB
4
1194
1297
2097
1200
1300
2100
1206
1303
2103
Baud
Hz
Hz
Space (Logical 0) Frequency
Tx 75bits/sec (V.23 mode)
Baud Rate (set by UART and Xtal frequency)
Mark (Logical 1) Frequency
Space (Logical 0) Frequency
74
388
448
75
390
450
76
392
452
Baud
Hz
Hz
Tx 1200bits/sec (Bell 202 mode)
Baud Rate (set by UART and Xtal frequency)
Mark (Logical 1) Frequency
1194
1197
2197
1200
1200
2200
1206
1203
2203
Baud
Hz
Hz
Space (Logical 0) Frequency
Tx 150bits/sec (Bell 202 mode)
Baud Rate (set by UART and Xtal frequency)
Mark (Logical 1) Frequency
149
385
485
150
387
487
151
389
489
Baud
Hz
Hz
Space (Logical 0) Frequency
Notes:
4. At V = 5.0V, Tx o/p level control bit set to ‘1’; load resistance greater than 40kΩ.
DD
2003 CML Microsystems Plc
20
D/624/7
CMLMICRO [ CML MICROCIRCUITS ]
