TLK2208B Datasheet, PDF (34/40 Pages) Texas Instruments – 8-PORT GIGABIT ETHERNET TRANCSEIVER

TLK2208B
8ĆPORT GIGABIT ETHERNET TRANSCEIVER
SLLS578D − AUGUST 2003 − REVISED SEPTEMBER 2006
reference clock timing requirements (REFCLK) over recommended operating conditions (unless
otherwise noted)
PARAMETER
TEST CONDITION
R_ω
Frequency
Minimum data rate
Maximum data rate
Accuracy
Duty cycle
Jitter, random and deterministic
MIN
NOM–0.01%
NOM–0.01%
–100
40%
NOM
100
130
50%
MAX
NOM+0.01%
NOM+0.01%
100
60%
40
UNIT
MHz
ppm
ps
This clock should be crystal referenced to meet the requirements of the above table. Contact TI for specific
clocking recommendations. Turning off REFCLK might lead to increased current consumption. If REFCLK is
turned off, it is recommended to power down the IC via MDIO to avoid unwanted current drain.
serial transmitter/receiver characteristics
VOD(p)
VOD(d)
VOD(pp)
VOD(pd)
V(CMT)
VID
VID(p)
ILKG
CI
tr, tf
PARAMETER
TEST CONDITION
TX output voltage magnitude
Maximum preemphasis enabled. See
Figure 10
Preemphasis disabled. See Figure 10
Maximum preemphasis enabled. See
TX output differential peak-to-peak voltage swing ^{Figure 10}
Preemphasis disabled. See Figure 10
TX output common-mode voltage range
See Figure 10
RX input voltage magnitude away from common
mode
See Figure 12
RX input differential peak-to-peak voltage swing See Figure 12
RX input leakage current
RX input capacitance
Differential output signal rise, fall time (20% to
80%)
RL = 50 Ω, CL = 5 pF, See Figure 10
t(J_TOL) Jitter tolerance, total jitter at serial input
Zero crossing, See Figure 13
t(J_DR) Serial input deterministic jitter
Zero crossing, See Figure 13
t(J_T)
Serial output total jitter
Alternating disparity K28.5, 1.25 Gbps
t(J_D)
Serial output deterministic jitter
Alternating disparity K28.5, 1.25 Gbps
td(R)
Total delay from RDI input to RD output
td(T)
Total delay from TD input to TDO output
NOTES: 7. REFCLK jitter equals to 6 ps RMS at RX and TX jitter measurements.
8. Unit Interval = One serial bit time (minimum 800 ps)
MIN NOM MAX UNIT
900 1050 1250 mV
650 800 1050 mV
1800 2100 2500 mVp-p
1300 1600 2100 mVp-p
800
1200 mV
200
900 mV
400
2500 mVp-p
−10
10 µA
2 pF
150 220 ps
0.75
UI
(Note 8)
0.462 UI
0.15 0.24 UI
0.12 UI
170
UI
130
UI
V(CMT)
VOD(p)
VOD(d)
VOD(p)
VOD(pp)
VOD(pd)
VOD(d)
tr , tf
Bit
Time
Figure 10. Differential and Common-Mode Output Voltage Definitions
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