KS8721B/BT
Micrel
Symbol
Parameter
Condition
Min
Typ
Max
Units
10BaseTX Receive
RIN
RX+/RX– Differential
Input Resistance
8
kΩ
VSQ
Squelch Threshold
5MHz square wave
400
mV
10BaseTX Transmit (measured differentially after 1:1 transformer)
VP
Peak Differential Output Voltage
Jitters Added
50Ω from each output to VDD
50Ω from each output to VDD
2.2
2.8
V
±3.5
ns
ns
tr, tt
Rise/Fall Time
25
Clock Outputs
X1, X2
Crystal Oscillator
25
25
MHZ
MHZ
RXC100
RXC10
Receive Clock, 100TX
Receive Clock, 10T
Receive Clock Jitters
Transmit Clock, 100TX
Transmit Clock, 10T
Transmit Clock Jitters
2.5
3.0
25
MHZ
ns(pk-pk)
MHZ
TXC100
TXC10
2.5
1.8
MHZ
ns(pk-pk)
August 2003
23
KS8721B/BT
MICREL [ MICREL SEMICONDUCTOR ]
