XRT4500 Datasheet, PDF (10/99 Pages) Exar Corporation – MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

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PIN DESCRIPTIONS (CONT.)
XRT4500
MULTIPROTOCOL SERIAL NETWORK INTERFACE IC
REV. 1.0.7
PIN
Signal
#
DTE
MODE
DCE TYPE FUNCTION
MODE
15
TX5D
D_DTR D_DSR
I Transmitter 5 – Digital Data Input from Terminal Equipment
This input pin accepts a TTL level binary data stream, from the
local terminal equipment, and outputs it, in either a V.10, V.11 or
V.28 manner, via the TX5A (pin 12) and TX5B (pin 13) output
pins. The exact role that this input pin plays depends upon
whether the XRT4500 is operating in the DTE or DCE Modes.
DTE Mode – Data Terminal Ready (DTR) Input Pin
If the XRT4500 is operating in the DTE mode, then this input pin
should be tied to the DTR output pin of the terminal equipment.
DCE Mode – Data Set Ready (DSR) Input Pin
If the XRT4500 is operating in the DCE mode, then this input pin
should be tied to the DSR output pin of the terminal equipment.
16
VPP
17
TX8D
D_RL D_RI
Note: If the XRT4500 has been configured to operate in the
“Registered” Mode, then data applied to this input pin will be
latched (into the XRT4500) upon the rising edge of the
REG_CLK input signal.
+12V Power: This supply voltage is internally generated by the
Charge Pump Circuit within the XRT4500 device. If +12V is
available, then the external components can be eliminated.
I Transmitter 8 – Digital Data Input from Terminal Equipment
This input accepts a TTL level binary data stream, from the local
terminal equipment, and outputs it, in either a V.10 or V.28 man-
ner via the TX8O (pin 19) output pin.
DCE Mode – Ring Indicator (or Test Mode) Input Pin
If the XRT4500 has been configured to operate in the
DCE Mode – This input pin should be connected to either the
“RI” (Ring Indicator) or the “TM” (Test Mode) indicator output pin
of the Terminal Equipment.
DTE Mode – Remote Loop-back Indicator Input Pin
If the XRT4500 has been configured to operate in the
DTE Mode – This input pin should be connected to the “RL”
(Remote Loop-back) indicator output pin of the Terminal Equip-
ment.
Note: If the XRT4500 has been configured to operate in the
“Registered” Mode, then data applied to this input pin will be
latched (into the XRT4500) upon the rising edge of the
REG_CLK input signal.
7