DS80PCI402_15 Datasheet, PDF (8/54 Pages) Texas Instruments – 2.5-Gbps / 5.0-Gbps / 8.0-Gbps 4-Lane PCI-Express Repeater With Equalization and De-Emphasis

DS80PCI402
SNLS324E – APRIL 2011 – REVISED JANUARY 2015
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Electrical Characteristics (continued)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
HIGH-SPEED OUTPUTS
V_TX-DIFF-PP
Output voltage differential swing Differential measurement with OUT_n+
0.8
1.0
1.2
and OUT_n-,
terminated by 50Ω to GND,
Vp-p
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
–3.5
dB
V_{TX-DE-RATIO_6} TX de-emphasis ratio
VOD = 1.0 Vp-p,
DEM0 = R, DEM1 = R
Gen 1 & 2 modes only
–6
dB
T_TX-DJ
Deterministic Jitter
VID = 800 mV, PRBS15 pattern, 8.0
Gbps, VOD = 1.0 V,
EQ = 00, DE = 0 dB (no input or output
trace loss)
0.05
UIpp
T_TX-RJ
Random Jitter
VID = 800 mV, 0101 pattern, 8.0 Gbps,
VOD = 1.0 V,
EQ = 00, DE = 0 dB, (no input or
output trace loss)
0.3
ps RMS
T_TX-RISE-FALL TX rise/fall time
20% to 80% of differential output
voltage ⁽²⁾
35
45
ps
T_RF-MISMATCH TX rise/fall mismatch
20% to 80% of differential output
voltage ⁽²⁾
0.01
0.1
UI
RL_TX-DIFF
TX differential return loss
0.05 to 1.25 GHz
1.25 to 2.5 GHz
–16
dB
–12
dB
2.5 to 4 GHz
–11
dB
RL_TX-CM
TX common mode return loss
0.05 to 2.5 GHz
2.5 to 4 GHz
–12
dB
–8
dB
Z_TX-DIFF-DC
V_TX-CM-AC-PP
DC differential TX impedance
TX AC peak-peak common
mode voltage
VOD = 1.0 Vp-p,
DEM0 = 1, DEM1 = 0⁽²⁾
100
Ω
100 _mVp-p
I_TX-SHORT
V_TX-CM-DC-
ACTIVE-IDLE-
DELTA
V_{TX-CM-DC-LINE-}
DELTA
TX short circuit current limit
Absolute delta of DC common
mode voltage during L0 and
electrical idle
Absolute delta of DC common
mode voltgae between TX+ and
TX-
Total current the transmitter can supply
when shorted to VDD or GND
(2)
(2)
20
mA
100
mV
25
mV
T_TX-IDLE-DATA
Max time to transition to
differential DATA signal after
IDLE
VID = 1.0 Vp-p, 8 Gbps
3.5
ns
T_TX-DATA-IDLE
T_PLHD/PHLD
Max time to transition to IDLE
after differential DATA signal
High-to-low and low-to-high
differential propagation delay
VID = 1.0 Vp-p, 8 Gbps
EQ = 00⁽³⁾
6.2
ns
200
ps
T_LSK
T_PPSK
Lane-to-lane skew
Part-to-part propagation delay
skew
T = 25° C, VDD = 2.5 V
T = 25° C, VDD = 2.5 V
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 DS80PCI402 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) Parameter is characterized but not tested in production.
(3) Propagation delay measurements will change slightly based on the level of EQ selected. EQ = 00 will result in the largest propagation
delays.
8
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