XRT4500 データシートの表示（PDF） - Exar Corporation

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XRT4500

MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

Exar Corporation 

XRT4500

MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

REV. 1.0.5

PIN DESCRIPTIONS (CONT.)

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PIN Signal

DTE DCE TYPE FUNCTION

#

MODE MODE

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 20KΩ 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 V.28/EIA-232 or V.10 Modes.

5

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