H5007NL datasheet(13/56 Pages) MICREL

13 / 56 page

Micrel, Inc.

KSZ9021RL/RN

October 2009

M9999-101309-1.1

Pin Number

Pin Name

Type

(1)

Pin Function

RESET_N

Ipu

Chip Reset (active low)

Hardware pin configurations are strapped-in at the de-assertion (rising edge) of

RESET_N. See “Strapping Options” section for more details.

LDO_O

On-chip 1.2V LDO Controller Output

This pin drives the input gate of a P-channel MOSFET to generate 1.2V for the

chip’s core voltages. If 1.2V is provided by the system and this pin is not used, it

can be left floating.

AVDDL_PLL

1.2V analog VDD for PLL

25MHz Crystal feedback

This pin is a no connect if oscillator or external clock source is used.

Crystal / Oscillator / External Clock Input

25MHz +/-50ppm tolerance

AVDDH

3.3V analog VDD

ISET

I/O

Set transmit output level

Connect a 4.99K

Ω 1% resistor to ground on this pin.

AGNDH_BG

Gnd

Analog ground

AVDDH

3.3V analog VDD

E-PAD

Gnd

Exposed Pad on bottom of chip

Connect E-PAD to ground.

Note:

1. P = Power supply.

Gnd = Ground.

I = Input.

O = Output.

I/O = Bi-directional.

Ipu = Input with internal pull-up.

Ipu/O = Input with internal pull-up / Output.

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