CH1787(1998) View Datasheet(PDF) - Cermetek Microelectronics
Part Name
Description
View to exact match
CH1787 Datasheet PDF : 13 Pages
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S ym bol
V
cc
I
cc
V
OL
V
OH
V
IL
V
IH
V T+
V T-
Table 5. CH1787 Electrical Specifications
Ta=25OC
C haracteristic
M in. Typ. M ax. U nits
S upply voltage
4.75 5.0 5.25
V
S upply C urrent
O ffhook operating current
O n hook operating current
P ow erdow n operating current
O utputLow Voltage
(I =0.4m A )C O N
OL
(I =5.0m A )D IR
OL
(I =1.6m A )S LE E P,D S R ,D C D ,H S ,R X D
OL
(I =4m A )V /D
OL
O utputH igh Voltage
(I =-0.2m A )C O N ,D IR
OH
(I =-100uA )S LE E P,D S R ,D C D ,H S ,R X D
OH
(I =-4m A )V /D
OH
InputLow Voltage
TS T,O R G,O R A ,H N G,A A R ,A N S
D TR ,TX D
InputH igh Voltage
TS T,O R G,O R A ,H N G,A A R ,A N S
D TR ,TX D
50
75
mA
40
mA
16
mA
0.3
V
0.3
V
0.4
V
0.26
V
4.45
2.4
4.18
3.3
2.4
V
V
V
0.95
V
0.8
V
V
V
P ositive H ysteresis Threshold forR esetpin
2.7
V
N egative H ysteresis Threshold forR esetpin
1.6
V
In certain circumstances, it may be necessary for the telephone
company to request information from you concerning the equip-
ment, which you have connected to your telephone line. Upon
request of the telephone company, provide the FCC registration
number and the ringer equivalence number (REN); both of these
items are listed on the equipment label. The sum of II of the RENs
on your telephone lines should be less than five in order to assure
proper service from the telephone company. In some cases, a
sum of five may not be useable on a given line.
If Problems Arise: If any of your telephone equipment is not oper-
ating properly, you should immediately remove it from your tele-
phone line, as it may cause harm to the telephone network. If the
Telephone Company notes a problem, they may temporarily dis-
continue service. When practical, they will notify you in advance of
this disconnection. If advance notice is not feasible, you will be
notified as soon as possible. When you are notified, you will be
given the opportunity to correct the problem and informed of your
right to file a complaint with the FCC. Contact your telephone
company if you have any questions about your phone line.
In the event repairs are ever needed on the (insert your product
name), they should be performed by (insert your company name)
or an authorized representative of (insert your company name).
For information contact: (insert your company address).
DEFAULT STATUS, PERFORMANCE, AND SPECS
Default Configuration Profile
Async mode selected
2400bps
Bell 212A operation at 1200bps
Even parity
Auto answer disabled
Command echo ON
All result codes enabled extended
Wait for dial tone before dialing 2 seconds
Detects busy signal
Full word result codes
Pulse dial make/break ratio = 39/61
DSR enabled
Modem enabled DTR
DCD enabled
Speaker enabled but off when receiving carrier
Speaker volume set to medium
Local modem will grant RDL request from remote modem
Guard tones disabled
Minimum DTR pulse width = 0.1 seconds
Ring count 01 (CH1786)
Escape code character = 43
Carriage return character = 13
Line feed character = 10
Back space character = 08
Duration of wait for dial tone = 02 seconds
Duration of wait for carrier after dialing = 30 seconds
Duration of deal pulse (comma) = 02 seconds
Carrier detect response time = 0.1 seconds
Escape code guard time = 1 second
Length of use after comma = 2.0 seconds
Last carrier to hang up delay = 0.1 seconds
DTMF interdigit delay = 0.1 seconds
DTMF Attenuation = -4dB
Sleep mode inactivity time = 5 seconds
Long space disconnect disabled
Cermetek Microelectronics, Inc.
Document No. 603-0182 Rev. D (11/98) 11
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