Cermetek Microelectronics, Inc.
High Speed Internet Modem Family
2005 Cermetek Microelectronics, Inc.
Page 16
Document No. 607-0017 Revision I1 (05/05)
Table 6A. CH2124 iModem Electrical Specifications.
Symbol Characteristic Min.
Typ.
Max.
Units
V
CC
Positive Supply Voltage
4.5
5.0
5.5
V
I
CC
Off Hook
Nominal Operating Current @
V
CC
= 5.5V when modem is Off Hook
30.0
50.0
mA
V
IH
High Level Input Voltage @ 5.0V
2.0
3.5
V
V
IL
Low Level Input Voltage @ 5.0V
1.0
2.2
V
VT+
Positive Hysteresis Threshold for RESET Pin
2.6
V
VT-
Negative Hysteresis Threshold for RESET Pin
2.4
V
V
OH
High Level Output (I
OH
= 0.5mA)*
2.4
V
V
OL
Low Level Output (I
Ol
= 1.6mA)*
0.6
V
I
IN
Input Leakage Current (TXD, DTR, RTS, IN1,
IN2, SEND
100
uA
I
IL
Input Current (RST)
580
uA
C
P
Capacitive Load (TXD, DTR, RTS)
Capacitive Load (RTS)
10
8
pF
pF
Table 6B. CH2160 iModem Electrical Specifications.
Symbol Characteristic Min.
Typ.
Max.
Units
V
CC
Positive Supply Voltage
4.5
5.0
5.5
V
I
CC
Off Hook
Nominal Operating Current @
V
CC
= 5.5V when modem is Off Hook
120.0 mA
V
IH
High Level Input Voltage @ 5.0V
2.0
3.5
V
V
IL
Low Level Input Voltage @ 5.0V
1.0
2.2
V
VT+
Positive Hysteresis Threshold for RESET Pin
2.5
V
VT-
Negative Hysteresis Threshold for RESET Pin
1.2
V
V
OH
High Level Output (I
OH
= 0.5mA)*
2.4
V
V
OL
Low Level Output (I
Ol
= 1.6mA)*
0.6
V
I
IN
Input Leakage Current (TXD, DTR, RTS, IN1,
IN2, SEND
100
uA
I
OH
Input Current (RST)
580
uA
C
P
Capacitive Load (TXD, DTR, RTS)
Capacitive Load (RTS)
10
8
pF
pF
IMPORTANT NOTE
Cermetek recommends a minimum of 50ms inter-character delay when sending commands to the CH2124/60
iModem. Failure to do so could result in unpredictable performance.
