Micrel, Inc. KS8721BL/SL
June 2009
25
M9999-062509-1.3
10Base-TX Receive
R
IN
RX+/RX– Differential Input
Resistance
8 kW
V
SQ
Squelch Threshold 5MHz square wave 400 mV
10Base-TX Transmit (measured differentially after 1:1 transformer)
Peak Differential Output Voltage 50W from each output to V
DD
2.2 2.8 V V
P
Jitters Added 50W from each output to V
DD
±3.5 ns
t
r
, t
f
Rise/Fall Time 25 ns
Clock Outputs
X1, X2 Crystal Oscillator 25 MHz
RXC
100
Receive Clock, 100TX 25 MHz
Receive Clock, 10T 2.5 MHz RXC
10
Receive Clock Jitters 3.0 ns
(pp)
TXC
100
Transmit Clock, 100TX 25 MHz
Transmit Clock, 10T 2.5 MHz TXC
10
Transmit Clock Jitters 1.8 ns
(pp)
Notes:
1. Exceeding the absolute maximum rating may damage the device. Operating at maximum conditions for extended periods may affect device reliability.
2. The device is not guaranteed to function outside its operating rating. Unused inputs must always be tied to an appropriate logic voltage level
(Ground to V
DD
)
3. No (HS) heat spreader in this package.
4. Specification for packaged product only.
5. There is 100% data transmission in full-duplex mode and a minimum IPG with a 130-meter cable.
