KSZ8091MLX Datasheet, PDF (9/72 Pages) Micrel Semiconductor – 10Base-T/100Base-TX Physical Layer Transceiver

Micrel, Inc.
KSZ8091MLX
Pin Description
Pin Number
1
2
3
Pin Name
GND
GND
GND
4
VDD_1.2
5
NC
6
NC
7
VDDA_3.3
8
NC
9
RXM
10
RXP
11
TXM
12
TXP
13
GND
14
XO
15
XI
16
REXT
17
GND
18
MDIO
Type⁽²⁾
GND
GND
GND
P
P
I/O
I/O
I/O
I/O
GND
O
I
I
GND
Ipu/Opu
Pin Function
Ground.
Ground.
Ground.
1.2V core VDD. (Power supplied by KSZ8091MLX.)
Decouple with 2.2µF and 0.1µF capacitors to ground, and join with Pin 31 by power
trace or plane.
No Connect. This pin is not bonded and can be left floating.
No Connect. This pin is not bonded and can be left floating.
3.3V analog VDD.
No Connect. This pin is not bonded and can be left floating.
Physical Receive or Transmit Signal (− differential).
Physical Receive or Transmit Signal (+ differential).
Physical Transmit or Receive Signal (− differential).
Physical Transmit or Receive Signal (+ differential).
Ground.
Crystal Feedback for 25MHz Crystal. This pin is a no connect if an oscillator or
external clock source is used.
Crystal / Oscillator / External Clock Input (25MHz ±50ppm).
Set PHY Transmit Output Current. Connect a 6.49kΩ resistor to ground on this pin.
Ground.
Management Interface (MII) Data I/O. This pin has a weak pull-up, is open-drain, and
requires an external 1.0kΩ pull-up resistor.
19
MDC
Ipu
Management Interface (MII) Clock Input. This clock pin is synchronous to the MDIO
data pin.
RXD3/
MII mode: MII Receive Data Output[3]⁽³⁾.
20
PHYAD0
Ipu/O
Config mode: The pull-up/pull-down value is latched as PHYADDR[0] at the
de-assertion of reset. See the Strapping Options section for details.
Notes:
2. P = Power supply.
GND = Ground.
I = Input.
O = Output.
I/O = Bi-directional.
Ipu = Input with internal pull-up (see Electrical Characteristics for value).
Ipd = Input with internal pull-down (see Electrical Characteristics for value).
Ipu/O = Input with internal pull-up (see Electrical Characteristics for value) during power-up/reset; output pin otherwise.
Ipd/O = Input with internal pull-down (see Electrical Characteristics for value) during power-up/reset; output pin otherwise.
Ipu/Opu = Input with internal pull-up (see Electrical Characteristics for value) and output with internal pull-up (see Electrical Characteristics for
value).
Opd = Output with internal pull-down (see Electrical Characteristics for value).
3. MII RX Mode: The RXD[3:0] bits are synchronous with RXC. When RXDV is asserted, RXD[3:0] presents valid data to the MAC.
August 31, 2015
9
Revision 1.2