DS80PCI800SQ Datasheet, PDF (8/45 Pages) Texas Instruments – DS80PCI800 2.5 Gbps / 5.0 Gbps / 8.0 Gbps 8 Channel PCI Express Repeater

DS80PCI800
SNLS334E – APRIL 2011 – REVISED MARCH 2012
Electrical Characteristics (continued)
V_tx-diff-pp
Output Voltage
Differential measurement with
0.8
Differential Swing
OUT_n+ and OUT_n-,
terminated by 50Ω to GND,
AC-Coupled, VID = 1.0 Vp-p,
DEM0 = 1, DEM1 = 0,
(1)
V_{tx-de-ratio_3.5}
TX de-emphasis ratio
VOD = 1.0 Vp-p,
DEM0 = 0, DEM1 = R,
GEN 1, 2 modes only
V_{tx-de-ratio_6}
TX de-emphasis ratio
VOD = 1.0 Vp-p,
DEM0 = R, DEM1 = R,
GEN 1, 2 modes only
T_TX-HF-DJ-DD
T_TX-HF-DJ-DD
TX Dj > 1.5 MHz
TX RMS jitter < 1.5
MHz
T_TX-RISE-FALL
TX rise/fall time
20% to 80% of differential
35
output voltage
T_RF-MISMATCH
TX rise/fall mismatch 20% to 80% of differential
output voltage
RL_TX-DIFF
TX Differential return
loss
0.05 - 1.25 GHz
1.25 - 2.5 GHz
2.5 - 4 GHz
RL_TX-CM
TX Common mode
return loss
0.05 - 2.5 GHz
2.5 - 4 GHz
Z_TX-DIFF-DC
DC differential TX
impedance
V_TX-CM-AC-PP
TX AC common mode VOD = 1.0 Vp-p,
voltage
DEM0 = 1, DEM1 = 0
I_TX-SHORT
TX short circuit current Total current the transmitter
limit
can supply when shorted to
VDD or GND
V_TX-CM-DC-
ACTIVE-IDLE-DELTA
Absolute delta of DC
common mode voltage
during L0 and electrical
idle
V_{TX-CM-DC-LINE-}
DELTA
Absolute delta of DC
common mode voltgae
between TX+ and TX-
T_TX-IDLE-DATA
Max time to transition
to differential DATA
signal after IDLE
VID = 1.0 Vp-p, 8 Gbps
T_TX-DATA-IDLE
T_PLHD/PHLD
Max time to transition VID = 1.0 Vp-p, 8 Gbps
to IDLE after differential
DATA signal
High to Low
and Low to High
Differential Propagation
Delay
EQ = 00, ⁽²⁾
T_LSK
T_PPSK
Lane to lane skew
T = 25C, VDD = 2.5V
Part to part propagation T = 25C, VDD = 2.5V
delay skew
Equalization
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1.0
1.2
Vp-p
-3.5
dB
-6
dB
0.15
UI
3.0
ps RMS
45
ps
0.01
0.1
UI
-16
dB
-12
dB
-11
dB
-12
dB
-8
dB
100
Ω
100
mVpp
20
mA
100
mV
25
mV
3.5
ns
6.2
ns
200
ps
25
ps
40
ps
(1) In GEN3 mode, the output VOD level is not fixed. It will be adjusted automatically based on the VID input amplitude level. The output
VOD level set by DEMA/B[1:0] in GEN3 mode is dependent on the VID level and the frequency content. The DS80PCI800 repeater in
GEN3 mode is designed to be transparent, so the TX-FIR (de-emphasis) is passed to the RX to support the PCIe GEN3 handshake
negotiation link training.
(2) Propagation Delay measurements will change slightly based on the level of EQ selected. EQ = 00 will result in the shortest propagation
delays.
8
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