KS8721SL TR Micrel Inc, KS8721SL TR Datasheet - Page 17
![IC TXRX PHY 10/100 3.3V 48SSOP](/photos/6/84/68448/576-48-ssop_sml.jpg)
KS8721SL TR
Manufacturer Part Number
KS8721SL TR
Description
IC TXRX PHY 10/100 3.3V 48SSOP
Manufacturer
Micrel Inc
Type
Transceiverr
Specifications of KS8721SL TR
Number Of Drivers/receivers
1/1
Protocol
IEEE 802
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
576-1010 - BOARD EVAL EXPERIMENT KS8721SL
Lead Free Status / RoHS Status
Not Compliant, Contains lead / RoHS non-compliant
Other names
KS8721SLTR
Micrel, Inc.
still sends out its normal transmit pattern from MAC. FEF can be disabled by strapping pin 27 low. Refer to the
“Strapping Options” section.
Media Converter Operation
The KS8721BL/SL is capable of performing media conversion with two parts in a back-to-back RMII loop-back mode as
indicated in the diagram. Both parts are in RMII mode and with RMII BTB asserted (pins 21 and 22 strapped high). One
part is operating in TX mode and the other is operating in FX mode. Both parts can share a common 50MHz oscillator.
Under this operation, auto-negotiation on the TX side prohibits 10BASE-T link-up. Additional options can be
implemented under this operation. Disable the transmitter and set it at tri-state by controlling the high TXD2 pin. In order
to do this, RXD2 and TXD2 pins need to be connected via inverter. When TXD2 pin is high in both the copper and fiber
operation, it is disabled transmit. Meanwhile, the RXD2 pin on the copper side serves as the energy detect and can
indicate if a line signal is detected. TXD3 should be tied low and RXD3 let float. Please contact your Micrel FAE for a
media converter reference design.
June 2009
To the SD pin of the
Fiber Module
Rx +/-
Tx +/-
FR x
FTx
KS8721BL/SL
KS8721BL/SL
Figure 3. Fiber Module
Pin
34
(Fiber Mode)
Ref_CLK
Ref_CLK
21 22
TxC/
TxC/
21 22
Pin
Pin
17
RxD
TxD
TxD
RxD
V
V
CC
CC
50MHz
OSC
M9999-062509-1.3
KS8721BL/SL