KS8721B TR Micrel Inc, KS8721B TR Datasheet - Page 8

• Manufacturer Part Number: KS8721B TR
• Description: IC TXRX PHY 10/100 2.5V 48SSOP
• Manufacturer: Micrel Inc
• Type: Transceiverr

Specifications of KS8721B TR

• 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
• For Use With: 576-1006 - BOARD EVAL EXPERIMENT KS8721B
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: KS8721BTR

Note 1.
M9999-030106
Pin Number
Pin Number
Pin Number
37
37
37
37
37
38
38
38
38
38
39
39
39
39
39
40
40
40
40
40
41
41
41
41
41
42
42
42
42
42
43
43
43
43
43
44
44
44
44
44
45
45
45
45
45
46
46
46
46
46
47
47
47
47
47
48
48
48
48
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
Pin Name
Pin Name
VDDRCV
VDDRCV
VDDRCV
VDDRCV
VDDRCV
VDDPLL
VDDPLL
VDDPLL
VDDPLL
VDDPLL
VDDTX
VDDTX
VDDTX
VDDTX
VDDTX
REXT
REXT
REXT
REXT
REXT
RST#
RST#
RST#
RST#
RST#
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
TX+
TX+
TX+
TX+
TX+
TX-
TX-
TX-
TX-
TX-
XO
XO
XO
XO
XO
XI
XI
XI
XI
XI
Type
Type
Type
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
Pwr
Pwr
Pwr
Pwr
Pwr
Pwr
Pwr
Pwr
Pwr
Pwr
Pwr
Pwr
Pwr
Pwr
Pwr
Ipu
Ipu
Ipu
Ipu
Ipu
(Note 1)
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
I
I
I
I
I
I
I
I
I
I
Pin Function
Pin Function
External resistor (6.49kΩ) connects to REXT and GNDRX.
External resistor (6.49kΩ) connects to REXT and GNDRX.
External resistor (6.49kΩ) connects to REXT and GNDRX.
External resistor (6.49kΩ) connects to REXT and GNDRX.
External resistor (6.49kΩ) connects to REXT and GNDRX.
Analog 2.5V power supply.
Analog 2.5V power supply.
Analog 2.5V power supply.
Analog 2.5V power supply.
Analog 2.5V power supply.
Ground
Ground
Ground
Ground
Ground
Transmit Outputs: Differential transmit output for 100BaseTX/FX or 10BaseT.
Transmit Outputs: Differential transmit output for 100BaseTX/FX or 10BaseT.
Transmit Outputs: Differential transmit output for 100BaseTX/FX or 10BaseT.
Transmit Outputs: Differential transmit output for 100BaseTX/FX or 10BaseT.
Transmit Outputs: Differential transmit output for 100BaseTX/FX or 10BaseT.
Transmit Outputs: Differential transmit output for FX, 100BaseTX/FX or 10BaseT.
Transmit Outputs: Differential transmit output for FX, 100BaseTX/FX or 10BaseT.
Transmit Outputs: Differential transmit output for FX, 100BaseTX/FX or 10BaseT.
Transmit Outputs: Differential transmit output for FX, 100BaseTX/FX or 10BaseT.
Transmit Outputs: Differential transmit output for FX, 100BaseTX/FX or 10BaseT.
Transmitter 2.5V power supply.
Transmitter 2.5V power supply.
Transmitter 2.5V power supply.
Transmitter 2.5V power supply.
Transmitter 2.5V power supply.
Ground.
Ground.
Ground.
Ground.
Ground.
Ground.
Ground.
Ground.
Ground.
Ground.
XTAL feedback: Used with XI for Xtal application.
XTAL feedback: Used with XI for Xtal application.
XTAL feedback: Used with XI for Xtal application.
XTAL feedback: Used with XI for Xtal application.
XTAL feedback: Used with XI for Xtal application.
Crystal Oscillator Input: Input for a crystal or an external 25MHz clock
Crystal Oscillator Input: Input for a crystal or an external 25MHz clock
Crystal Oscillator Input: Input for a crystal or an external 25MHz clock
Crystal Oscillator Input: Input for a crystal or an external 25MHz clock
Crystal Oscillator Input: Input for a crystal or an external 25MHz clock
Analog PLL 2.5V power supply.
Analog PLL 2.5V power supply.
Analog PLL 2.5V power supply.
Analog PLL 2.5V power supply.
Analog PLL 2.5V power supply.
Chip Reset: Active low, minimum of 50µs pulse is required
Chip Reset: Active low, minimum of 50µs pulse is required
Chip Reset: Active low, minimum of 50µs pulse is required
Chip Reset: Active low, minimum of 50µs pulse is required
Chip Reset: Active low, minimum of 50µs pulse is required
8
March 2006