KS8721B Micrel Inc, KS8721B Datasheet - Page 8

• Manufacturer Part Number: KS8721B
• Description: Special Function IC
• Manufacturer: Micrel Inc
• Type: Transceiverr

Specifications of KS8721B

• Peak Reflow Compatible (260 C): No
• Leaded Process Compatible: No
• Number Of Drivers/receivers: 1/1
• Protocol: MII, RMII
• Voltage - Supply: 2.375 V ~ 2.625 V
• Mounting Type: Surface Mount
• Package / Case: 48-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With: 576-1006 - BOARD EVAL EXPERIMENT KS8721B
• Lead Free Status / RoHS Status: Not Compliant, Contains lead / RoHS non-compliant

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