XE3386 Ver la hoja de datos (PDF) - Xecom
Número de pieza
componentes Descripción
Lista de partido
XE3386 Datasheet PDF : 16 Pages
| |||
XE3386L Pin Descriptions
PIN NAME
1
Ring
2
Tip
3, 4 Not Used
5
SPK
6-9
N/C
10
TXD
11
RXD
12
/V-D
13
/DTR
14
/DSR
15
/RI
16
/CTS
17
/DCD
18
N/C
19
VCC
20
GND
21
RST
22
RTS
DESCRIPTION
Ring provides half of the two-wire connection to the telephone network, RJ-11 Pin 4.
A 1500 volt barrier isolates Ring from all other circuits. This isolation must be pre-
served throughout the system. The battery voltage on Ring may be positive or negative
with respect to Tip.
Tip provides half of the two-wire connection to the telephone network, RJ-11 Pin 3. A
1500 volt barrier isolates Tip from all other circuits. This isolation must be preserved
throughout the system. The battery voltage on Tip may be positive or negative with re-
spect to Ring.
No Connection should be made to these pins.
SPK provides the audio output to a speaker. Speaker output is controlled by the ATL
and ATM commands. The input impedance to the speaker driver must be greater than
300 ohms.
No Connection
TXD provides serial data input from the host. A logic high represents a "Mark" and a
low represents a "Space".
RXD provides serial data output to the host. A logic high represents a "Mark" and a
low represents a "Space".
The Voice-Data output can be used to drive an external relay for switching between the
modem and handset connected to the same telephone line.
Data Terminal Ready is an active low input to the modem. The AT&D command sets
the function of DTR.
Data Set Ready is an active low output from the modem. Its operation is determined by
the AT&S command.
Ring Indicator is an active low output which marks the presence of a ring on the line.
The XE3386L uses Clear to Send for hardware flow control. With hardware flow con-
trol active the modem raises \CTS to signal the host that the modem's transmit data
buffer is nearly full. When the buffer empties, the modem reactivates CTS.
Data Carrier Detect goes low to indicate receipt of a valid incoming carrier. The
AT&C1 command enables the carrier detect function.
No Connection
VCC provides the +5 volt power required by the modem.
Ground provides the common reference for the XE3386L.
This active high input causes a hardware reset in the XE3386L. The reset pulse must be held
high for at least 10 milliseconds to correctly reset the modem.
The modem uses Request to Send for hardware flow control. The modem stops sending data to
the host when the hosts raises /RTS. The modem resumes transferring data to the host when the
host activates /RTS
XECOM
(4)
XE3386L
Share Link: 