DS80PCI102_15 Datasheet, PDF (7/46 Pages) Texas Instruments – 2.5-Gbps / 5.0-Gbps / 8.0-Gbps 1-Lane PCI-Express Repeater With Equalization and De-Emphasis

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DS80PCI102
SNLS344G – JULY 2011 – REVISED AUGUST 2015
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+ and OUT_n-,
terminated by 50 Ω to GND,
AC-Coupled, VID = 1.0 Vp-p,
DEMA/B = 0,
VOD_SEL = Float, ⁽¹⁾
0.8
1.0
1.1
Vp-p
V_TX-DE-
RATIO_3.5
TX de-emphasis ratio
VOD = 1.0 Vp-p,
DEMA/B = Float,
VOD_SEL = Float, (GEN 1, 2 only)
–3.5
dB
V_{TX-DE-RATIO_6} TX de-emphasis ratio
VOD = 1.0 Vp-p,
DEMA/B = 20 kΩ to GND,
VOD_SEL = Float, (GEN 1, 2 only)
–6
dB
T_TX-RJ
Random Ritter
VID = 800 mV, 0101 pattern, 8.0
Gbps,
VOD = 1.0 V, EQ = 0x00,
DE = 0 dB
0.3
ps RMS
T_TX-DJ
Deterministic Jitter
VID = 800 mV,
PRBS15, 8.0 Gbps
VOD = 1.0 V, EQ = 0x00,
DE = 0 dB
0.05
UIpp
T_TX-RISE-FALL TX rise/fall time
20% to 80% of differential output
voltage, ⁽²⁾
34
45
ps
T_RF-MISMATCH TX rise/fall mismatch
20% to 80% of differential output
voltage, ⁽²⁾
0.01
UI
0.05 to 1.25 GHz
–16
dB
RL_TX-DIFF
TX Differential return loss
1.25 to 2.5 GHz
2.5 to 4 GHz
–12
dB
–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 common mode voltage
VOD = 1.0 Vp-p,
DEMA/B = 0,
VOD_SEL = Float, ⁽²⁾
100
Ω
100
mVp-p
I_TX-SHORT
TX short circuit current limit
V_TX-CM-DC-
ACTIVE-IDLE-
DELTA
V_{TX-CM-DC-LINE-}
DELTA
T_TX-IDLE-DATA
Absolute delta of DC common mode
voltage during L0 and electrical idle
Absolute delta of DC common mode
voltgae between TX+ and TX-
Max time to transition to differential
DATA signal after IDLE
Total current the transmitter can
supply when shorted to VDD or GND
(2)
(2)
VID = 1.0 Vp-p, 8 Gbps
20
mA
100
mV
25 _mV
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
DE = 0, EQ = 0x00, ⁽³⁾
6.5
ns
200
ps
T_LSK
T_PPSK
Lane-to-lane skew
Part-to-part propagation delay skew
T = 25ºC, VDD = 2.5 V
T = 25ºC, 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 DS80PCI102 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 = 0x00 will result in the shortest
propagation delays.
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