XE1212C View Datasheet(PDF) - Xecom
Part Name
Description
Manufacturer
XE1212C Datasheet PDF : 16 Pages
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Pin Descriptions
PIN NAME
DESCRIPTION
17
\CS
The XE1212C is selected when Chip Select is driven low. When high, the data bus lines
(D0..D7) will be in the high impedance state.
18
\DOST
19
\DIST
20
EHC
21-28 D7-D0
37,40 RING/TIP
The CPU can write data or control words into a selected register of the XE1212C when
DOST and CS are low. Data is latched on the rising edge of the signal.
The CPU can read data or status from a selected register of the when DIST and CS are
low.
External Handset Control. This pin is used to control an additional relay to connnect a
telephone handset to the telephone line. During data transmission, when the internal relay
in the DAA is closed (off hook), this pin is high. When the internal relay is open (on-hook),
this pin is low and may be used to close an external relay to connect the telephone handset
to the line.
This eight bit data bus provides bidirectional communications between the modem and
CPU. Data, Control words and Status information are transferred on these bus lines.
These are tri-state lines and have internal drive buffers eliminating the need for external
buffering between the CPU bus and the XE1212C.
These are the TIP and RING connections to the telephone line from the DAA. In order to
maintain the high voltage isolation provided by the DAA, traces from these pins to the
RJ11C Jack should have a minimum spacing of 100 mils between them and any other
traces on the board.
ABSOLUTE MAXIMUM RATINGS*
SUPPLY VOLTAGE - Vcc +6 Volts
DC INPUT VOLTAGE -0.6 Volts to (Vcc +0.6 Volts)
STORAGE TEMPERATURE RANGE -25° C TO +85° C
LEAD TEMPERATURE 260° C
(Soldering, 2 seconds per wave)
OPERATING TEMPERATURE RANGE 0 TO 70° C
*Exceeding these values may result in permanent damage to the device.
XECOM
(3)
XE1212C
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