CH1794 Cermetek Microelectronics, CH1794 Datasheet - Page 17

• Manufacturer Part Number: CH1794
• Manufacturer: Cermetek Microelectronics

Specifications of CH1794

• Lead Free Status / RoHS Status: Supplier Unconfirmed

Cermetek Microelectronics, Inc.
2004 Cermetek Microelectronics, Inc.
V
I
I
V
V
VT+
VT-
V
V
I
I
C
Test conditions: VCC = 5V ± 10%, Temp = 0°C to 70°F (unless otherwise stated).
*Output Load = 50 pF ± one TTL.
Off Hook Impedance
Trans Hybrid Loss
Ring Voltage Loop
Line Loop Current – (Off
Hook)
Return loss @ 1000 Hz
Ring Frequencies
Receiver Insertion Gain
Transmit Power
First Character After Reset
Inter Character Delay
Command Delay
Minimum Reset Pulse
Duration
* Note: Must wait for modem response before issuing new command.
CC
CC
IN
OH
CC
IH
IL
OH
OL
p
Symbol
Off Hook
On Hook
Parameter
Positive Supply Voltage
Operating Current @
V
Operating Current @
V
High Level Input Voltage*
Low Level Input Voltage*
Positive Hysteresis Threshold for RESET Pin
Negative Hysteresis Threshold for RESET Pin
High Level Output (I
Low Level Output (I
Input Leakage Current (TXD, DTR, RTS)
Input Current (RST)
Capacitive Load (TXD, DTR, RTS)
Capacitive Load (RST)
CC
CC
= 5.5V when modem is Off Hook
= 5.5V when modem is Off Hook
110V
Min.
-0.5
100
1.0
20
20
10
Table 8. HS Modem Electrical Specifications.
Table 9. HS Modem Electrical Specifications.
Characteristic
OL
OH
= 1.6 mA)*
= 0.5 mA)*
Typ.
-9.5
200
0.0
25
20
15
40
50
250V
Max.
+0.5
Page 17
100
Units
msec
msec
msec
Ohm
dBm
V
mA
sec
dB
dB
Hz
dB
PP
600 Ohm, RXA, TXA
On 48VDC line voltage for sustained
periods
Does not apply to CH1799LL
600 Ohm
600 Ohm – Data Mode
Delay
Between all command characters
Between all AT command characters*
If user supplied
Min.
4.5
2.0
2.4
Document No. 607-0003 Revision K6 (08/04)
Typ.
5.0
2.5
0.5
High Speed Modem and FAX Family
Comments
Max.
175
170
100
500
5.5
0.8
0.6
10
8
Units
mA
mA
µA
µA
pF
pF
V
V
V
V
V
V
V