ch1786nh ETC-unknow, ch1786nh Datasheet - Page 15

• Manufacturer Part Number: ch1786nh
• Description: Ch1786 Family Ultra Small 2400bps Modems
• Manufacturer: ETC-unknow

Cermetek Microelectronics, Inc.
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 @ 1000Hz
Ring Frequencies
Receiver Insertion Gain
Transmit Power
First Character After Reset
Inter Character Delay
Command Delay
Minimum Reset Pulse
Duration
2003 Cermetek Microelectronics, Inc.
I
I
Parameter
CC
CC
Off Hook
On Hook
I
VT+
V
V
CCPD
VT-
V
V
V
I
C
I
LO
IN
OH
CC
OL
IH
IL
P
Parameter
Positive Supply Voltage- Noise less than 50mV
Nominal Operating Current when modem is OFF Hook
Nominal Operating Current when modem is ON Hook
Power Down Current
High Level Input Voltage*
Low Level Input Voltage*
Input Leakage Current (TXD, DTR, RTS)
Leakage Current DCD, HS, RXD, SLEEP, DSR
Capacitive Lead (TXT, DTR, RST)
Positive Hysteresis Threshold for RESET pin
Negative Hysteresis Threshold for RESET pin
High Level (I
Low Level (I
OL
OH
= 1.6mA)*
Minimum
= 0.5mA)*
Table 8. CH1786 Electrical Specifications.
110V
-0.5
100
0.5
Table 9. CH1786 Electrical Specifications.
20
20
10
Description
Typical
-9.5
200
0.0
1.0
25
20
15
40
50
Page 15
Maximum
250V
+0.5
100
5
Ohms
Units
msec
msec
msec
dBm
mA
sec
CH1786 Family of Ultra Small 2400bps Modems
V
dB
dB
Hz
dB
pp
Document No. 607-0004 Revision L1 (06/03)
Min.
4.75
-0.3
2.4
15
2
600 Ohm, RXA, TXA
On 48VDC line voltage for
sustained periods
600 Ohm
600 Ohm- Data Mode
Delay
Between all command
characters
Between all AT commands
If user supplied
Typ.
5.0
2.5
1.8
50
25
Comments
Ma
5.2
0.8
0.6
75
50
10
10
10
10
x.
5
0
Units
mA
mA
mA
uA
uA
pF
V
V
V
V
V
V
V