DP83847ALQA56A datasheet(7/60 Pages) NSC

Part #	DP83847ALQA56A

Description	DsPHYTER II ??Single 10/100 Ethernet Transceiver

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Manufacturer	NSC [National Semiconductor (TI)]

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1.3 Clock Interface

1.4 Special Connections

1.5 LED Interface

Signal Name

Type

LLP Pin #

Description

X1

I

49

REFERENCE CLOCK INPUT 25 MHz: This pin is the primary

clock reference input for the DP83847 and must be connected to

a 25 MHz 0.005% (

±50 ppm) clock source. The DP83847 sup-

ports CMOS-level oscillator sources.

X2

O

48

REFERENCE CLOCK OUTPUT 25 MHz: This pin is the primary

clock reference output.

Signal Name

Type

LLP Pin #

Description

RBIAS

I

3

Bias Resistor Connection. A 10.0 k

Ω 1% resistor should be con-

nected from RBIAS to GND.

C1

O

42

Reference Bypass Regulator. Parallel caps, 10

µ F (Tantalum pre-

ferred) and .1

µF, should be placed close to C1 and connected to

GND. See Section 3.8 for proper placement.

RESERVED

I/O

1, 2, 4, 5, 8,

9, 12, 13,

34, 44, 47,

50, 51, 52,

53, 54, 55,

61

RESERVED: These pins must be left unconnected

Signal Name

Type

LLP Pin #

Description

LED_DPLX/PHYAD0

S, O

23

FULL DUPLEX LED STATUS: Indicates Full-Duplex status.

LED_COL/PHYAD1

S, O

22

COLLISION LED STATUS: Indicates Collision activity in Half Du-

plex mode.

LED_GDLNK/PHYAD2

S, O

21

GOOD LINK LED STATUS: Indicates Good Link Status for

10BASE-T and 100BASE-TX.

LED_TX/PHYAD3

S, O

20

TRANSMIT LED STATUS: Indicates transmit activity. LED is on

for activity, off for no activity.

LED_RX/PHYAD4

S, O

19

RECEIVE LED STATUS: Indicates receive activity. LED is on for

activity, off for no activity.

LED_SPEED

O

18

SPEED LED STATUS: Indicates link speed; high for 100 Mb/s,

low for 10 Mb/s.

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DP83847ALQA56A Datasheet(PDF) 7 Page - National Semiconductor (TI)

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