參數(shù)資料
型號: XRT4500CV
廠商: EXAR CORP
元件分類: 通信及網(wǎng)絡(luò)
英文描述: MULTIPROTOCOL SERIAL NETWORK INTERFACE IC
中文描述: SPECIALTY TELECOM CIRCUIT, PQFP80
封裝: 14 X 14 MM, 1.40 MM HEIGHT, TQFP-80
文件頁數(shù): 8/99頁
文件大?。?/td> 1384K
代理商: XRT4500CV
á
XRT4500
MULTIPROTOCOL SERIAL NETWORK INTERFACE IC
REV. 1.0.7
5
PIN DESCRIPTIONS (CONT.)
PIN
#
Signal
DTE
MODE
DCE
MODE
TYPE FUNCTION
6
M2
I
Mode Control – Mode Select Input 2
This input pin, along with M0 and M1 are used to configure the
XRT4500 to operate in the desired “Communication Interface”
Mode. Table 3 and Table 4 present the relationship between
the states of the M2, M1 and M0 input pins and the correspond-
ing communication interface modes selected.
This input pin (along with M0 and M1) is internally latched into
the XRT4500 device, upon the rising edge of the “LATCH” sig-
nal. At this point, changes in this input pin will not effect the
“internally latched” state of this pin.
This input pin contains an Internal 20K
pull-up to VDD.
7
VSS
-6V Power:
This supply voltage is internally generated by the
Switching Regulator Circuit within the XRT4500. The -6V is used
by TX 4, 5, 6, 7, 8.
8
TX4D
D_RTS
D_CTS
I
Transmitter 4 – Digital Data Input from Terminal Equipment
The XRT4500 accepts binary TTL Level data stream, via this
input pin, converts it into either a V.10, V.11 or V.28 format and
outputs it via the TX4A and TX4B output pins.
The exact role that this pin plays depends upon whether the
XRT4500 is operating in the DCE or DTE Mode.
DCE Mode – CTS (Clear to Send) Input
If the XRT4500 is operating in the DCE Mode, then this input pin
should be tied to the CTS Output pin of the Terminal Equipment.
DTE Mode – RTS (Request to Send) Input
If the XRT4500 is operating in the DTE Mode, then this input pin
should be tied to the RTS output pin of the Terminal Equipment.
9
VDD
Analog VDD –
For Transmitters 4, 5, 6, 7 and 8
10
TX4B
RTSB
CTSB
O
Transmitter 4 – Positive Data Differential Output to Line
The XRT4500 accepts a TTL binary data stream from the Termi-
nal Equipment via the TX4D (pin 8) input pin. The XRT4500 will
convert this data into either the V.10, V.11 or V.28 modes, and
will output it via this pin and TX4A (pin 11).
The exact role that this pin plays depends upon whether the
XRT4500 is operating in the DTE or DCE mode.
DTE Mode
– Positive Polarity portion of RTS Line Signal.
DCE Mode
– Positive Polarity portion of CTS Line Signal.
Note:
This output pin is not used if the XRT4500 has been con-
figured to operate in either the V28/EIA-232 or V10 Modes.
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