KS8721B Micrel Inc, KS8721B Datasheet - Page 7

• 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

Note 1.
April 2005
KS8721B/BT
Pin Number
25
22
23
26
27
28
29
30
31
32
33
34
35
36
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
FXSD/FXEN
LED0/TEST
Pin Name
RMII_BTB
NWAYEN
PHYAD0
SPD100/
DUPLEX
VDDRX
noFEF
LED1/
LED2/
LED3/
INT#/
CRS/
GND
GND
GND
PD#
RX+
RX-
Type
Ipu/O
Ipd/O
Ipu/O
Ipu/O
Ipu/O
Ipu/O
Ipd/O
GND
GND
GND
Pwr
Ipu
(Note 1)
I
I
Pin Function
Management Interface (MII) Interrupt Out: Latched as PHYAD[0] during power up
/reset. See “Strapping Options” section for details.
MII Carrier Sense Output: The pull-up/pull-down value is latched as RMII BTB
during reset when RMII mode is selected. See “Strapping Options” section
for details.
Ground.
Link/Activity LED Output:
Lnk/Act
No Link
Link
Act
The external pull-down enable test mode and only used for the factory test.
Speed LED Output: Latched as SPEED (Register 0, bit 13) during power-up/reset.
See “Strapping Options” section for details.
Speed
10BT
100BT
Full-duplex LED Output: Latched as DUPLEX (register 0h, bit 8) during power-up/
reset. See “Strapping Options” section for details.
Duplex
Half
Full
Collision LED Output: Latched as ANEG_EN (register 0h, bit 12) during power-up/
reset. See “Strapping Options” section for details.
Collison
No Collision
Collision
Power Down. 1 = Normal operation, 0=Power down, Active low.
Analog 2.5V power supply.
Receive Input: Differential receive input pins for FX, 100BaseTX or 10BaseT.
Receive Input: Differential receive input pin for FX, 100BaseTX or 10BaseT.
Fiber Mode Enable / Signal Detect in Fiber Mode. If FXEN = 0, FX mode is
disable. The default is “0”. See “100BT FX Mode” section for more details.
Ground.
Ground.
Pin State
H
L
—
Pin State
H
L
Pin State
H
L
Pin State
H
L
7
LED Definition
“off”
“on”
“Toggle”
LED Definition
“off”
“on”
LED Definition
“off”
“on”
LED Definition
“off”
“on”
M9999-041405
Micrel, Inc.