KS8721B/BT
Pin Number
37
38
39
40
41
42
43
44
45
46
47
48
Note 1.
Micrel
Pin Name
REXT
VDDRCV
GND
TX-
TX+
VDDTX
GND
GND
XO
XI
VDDPLL
RST#
Type
(Note 1)
I
Pwr
GND
O
O
Pwr
GND
GND
O
I
Pwr
Ipu
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
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
KS8721B/BT
8
August 2003
MICREL [ MICREL SEMICONDUCTOR ]
