82503 Datasheet, PDF(6/45 Page) Intel Corporation

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82503 Datasheet, PDF (6/45 Pages) Intel Corporation – DUAL SERIAL TRANSCEIVER (DST)

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82503

2 1 Power Pins

Symbol

PLCC

VSS(1)

VCC(1)

VCCA(1)

VSSA(1)

7 17 39

6 18 40

QFP

1 11 33

44 12 34

Type

Supply

Name and Function

Digital Ground

Digital VCC A 5-V g 5% Power Supply

Analog VCC A 5-V g 5% Power Supply

Analog Ground

NOTE

1 VCC and VCCA must be connected to the same power supply VSS and VSSA must be connected to the same ground

Separate decoupling and noise conditioning (e g ferrite beads) should be used

2 2 Clock Pins

Symbol

PLCC

QFP

Type

Name and Function

CLOCK CRYSTAL A 20 MHz crystal input This pin can be driven

with an external MOS level clock when X2 is left floating

CLOCK CRYSTAL A 20 MHz crystal output X1 can be driven with

an external MOS level clock when this pin is left floating

2 3 AUI Pins

Symbol

PLCC

TRMT

RCV

CLSN

QFP

Type

Name and Function

TRANSMIT PAIR A differential output driver pair that drives the

transmit pair of the transceiver cable The output bit stream is

Manchester encoded Following the last transition which is positive

at TRMT the differential voltage is reduced to zero volts

RECEIVE PAIR A differentially driven input pair which is tied to the

receive pair of the Ethernet transceiver cable The first transition on

RCV is negative-going to indicate the beginning of the frame The

last transition is positive-going to indicate the end of the frame The

received bit stream is assumed to be Manchester encoded

COLLISION PAIR A differentially driven input pair tied to the

collision presence pair of the Ethernet transceiver cable The

collision presence signal is a 10 MHz square wave The first

transition at CLSN is negative-going to indicate the beginning of the

signal the last transition is positive-going to indicate the end of the

signal

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