KSZ8721BLA4TR Micrel Semiconductor, Inc., KSZ8721BLA4TR Datasheet - Page 8

• Manufacturer Part Number: KSZ8721BLA4TR
• Description: IC PHY 1CH 10/100MBPS 48LQFP T/R
• Manufacturer: Micrel Semiconductor, Inc.

KS8721B/BT
Note 1.
M9999-041405
Pin Number
37
38
39
40
41
42
43
44
45
46
47
48
Pwr = power supply
GND = ground
I = input
O = output
I/O = bi-directional
Ipu = input w/ internal pull-up
Ipd = input w/ internal pull-down
Ipd/O = input w/ internal pull-down during reset, output pin otherwise
Ipu/O = input w/ internal pull-up during reset, output pin otherwise
PU = strap pin pull-up
PD = strap pin pull-down
NC = No connect
Pin Name
VDDRCV
VDDPLL
VDDTX
REXT
RST#
GND
GND
GND
TX+
TX-
XO
XI
Type
GND
GND
GND
Pwr
Pwr
Pwr
Ipu
O
O
O
(Note 1)
I
I
Pin Function
External resistor (6.49kΩ) connects to REXT and GNDRX.
Analog 2.5V power supply.
Ground
Transmit Outputs: Differential transmit output for 100BaseTX/FX or 10BaseT.
Transmit Outputs: Differential transmit output for FX, 100BaseTX/FX or 10BaseT.
Transmitter 2.5V power supply.
Ground.
Ground.
XTAL feedback: Used with XI for Xtal application.
Crystal Oscillator Input: Input for a crystal or an external 25MHz clock
Analog PLL 2.5V power supply.
Chip Reset: Active low, minimum of 50µs pulse is required
8
Micrel, Inc.
April 2005