KSZ8721CL datasheet(8/33 Pages) MICREL

Part #	KSZ8721CL

Description	3.3V Single Power Supply 10/100BASE-TX/FX MII Physical Layer Transceiver

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Manufacturer	MICREL [Micrel Semiconductor]

Direct Link	http://www.micrel.com

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8 / 33 page

KS8721CL

Micrel, Inc.

M9999-041405

8

April 2005

Pin Number

Pin Name

Type(1)

Pin Function

31

VDDRX

P

Analog 2.5V power supply. See “Circuit Design Ref. for Power Supply” section for

details.

32

RX-

I

Receive Input. Differential receive input pins for 100FX, 100BASE-TX, or 10BASE-T.

33

RX+

I

Receive Input: Differential receive input pin for 100FX, 100BASE-TX, or 10BASE-T.

34

FXSD/FXEN

Ipd/O

Fiber Mode Enable / Signal Detect in Fiber Mode. If FXEN = 0, FX mode is

disable. The default is “0”. See “100BT FX Mode” section for more details.

35

GND

Ground.

36

GND

Ground.

37

REXT

I

External resistor (6.49kW ) connects to REXT and GND.

38

VDDRCV

P

Analog 2.5V power supply. 2.5V power output of voltage regulator. See “Circuit

Design Ref. for Power Supply” section for details.

39

GND

Ground.

40

TX-

O

Transmit Outputs: Differential transmit output for 100FX, 100BASE-TX, or

10BASE-T.

41

TX+

O

Transmit Outputs: Differential transmit output for 100FX, 100BASE-TX, or 10BASE-T.

42

VDDTX

P

Transmitter 2.5V power supply. See “Circuit Design Ref. for Power Supply” section

for details.

43

GND

Ground.

44

GND

Ground.

45

XO

O

XTAL feedback: Used with XI for Xtal application.

46

XI

I

Crystal Oscillator Input: Input for a crystal or an external 25MHz clock.

If an oscillator is used, XI connects to a 3.3V tolerant oscillator, and X2 is a no-

connect.

47

VDDPLL

P

Analog PLL 2.5V power supply. See “Circuit Design Ref. for Power Supply”

section for details.

48

RST#

Ipu

Chip Reset. Active low, minimum of 50µs pulse is required.

Notes:

1. P = Power supply.

GND = Ground.

I = Input.

I/O = Bidirectional.

Ipd = Input w/ internal pull-down.

Ipd/O = Input w/ internal pull-down during reset, output pin otherwise.

Ipu = Input w/ internal pull-up.

Ipu/O = Input w/ internal pull-up during reset, output pin otherwise.

O = Output.

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