XE1214B5 Просмотр технического описания (PDF) - Xecom
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XE1214B5 Datasheet PDF : 12 Pages
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Pin Descriptions
PIN NAME I/O
9
TXD
I
10 CLKOUT O
11
\RI
O
12 \AADIS I
13
\OH
O
14-16 N/C
---
17,20 TIP-RING ---
18,19 N/C
---
21-24 N/C
---
37 AUDIO O
38
N/C
---
39 GND ---
40 VCC ---
DESCRIPTION
This is the input for data to be transmitted. The internal controller of
the XE1214B5 receives command data from the terminal on this input
while the internal modem processor receives data from the terminal
on this input for modulation. A logic low is "space" and a logic high is
"mark".
The buffered internal clock signal is output on this pin. Its frequency
is 7.3728 MHz and it can drive one LS TTL load.
Ring Indicator. A low level on this status line indicates the ring portion
of the ring cycle. This line is normally used for test/status purposes
only.
When this input is held low, the XE1214B5 will not answer incoming
calls. When held high or left open, the XE1214B5 will automatically
answer incoming calls on the first ring. This function may also be
enabled/disabled by writing to the S0 register.
Off Hook status monitor. This status line allows the user to monitor
the status of the hookswitch relay in the internal DAA (see block
diagram). When the signal on OH is low, the internal relay is closed
and the XE1214B5 is connected to the phone line. During rotary
dialing, this pin is pulsed at a rate of 10 pps with appropriate
Make/Break ratio depending on the 212A or V.22 mode selected.
No connection.
These pins are for the TIP and RING connections to the telephone
line from the internal DAA. In order to preserve the high voltage
isolation provided by the DAA, traces from these pins to the RJ11C
Jack should have a minimum spacing of 150 mils between them and
any other traces on the PC board.
No connection.
No connection.
The output of the internal hybrid 2-4 wire converter is brought out on
this pin through an internally programmable attenuator. The
attenuation level may be set by the ATL command.
No connection.
Ground (0 volts).
Positive supply voltage (+5 volts).
XE1214B5
3\XECOM
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