Datasheet

DS80PCI800
SNLS334E –APRIL 2011–REVISED MARCH 2012 www.ti.com
Electrical Characteristics (continued)
V
tx-diff-pp
Output Voltage Differential measurement with 0.8 1.0 1.2 Vp-p
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, -3.5 dB
DEM0 = 0, DEM1 = R,
GEN 1, 2 modes only
V
tx-de-ratio_6
TX de-emphasis ratio VOD = 1.0 Vp-p, -6 dB
DEM0 = R, DEM1 = R,
GEN 1, 2 modes only
T
TX-HF-DJ-DD
TX Dj > 1.5 MHz 0.15 UI
T
TX-HF-DJ-DD
TX RMS jitter < 1.5 3.0 ps RMS
MHz
T
TX-RISE-FALL
TX rise/fall time 20% to 80% of differential 35 45 ps
output voltage
T
RF-MISMATCH
TX rise/fall mismatch 20% to 80% of differential 0.01 0.1 UI
output voltage
RL
TX-DIFF
TX Differential return 0.05 - 1.25 GHz -16 dB
loss
1.25 - 2.5 GHz -12 dB
2.5 - 4 GHz -11 dB
RL
TX-CM
TX Common mode 0.05 - 2.5 GHz -12 dB
return loss
2.5 - 4 GHz -8 dB
Z
TX-DIFF-DC
DC differential TX 100 Ω
impedance
V
TX-CM-AC-PP
TX AC common mode VOD = 1.0 Vp-p, 100 mVpp
voltage DEM0 = 1, DEM1 = 0
I
TX-SHORT
TX short circuit current Total current the transmitter 20 mA
limit can supply when shorted to
VDD or GND
V
TX-CM-DC-
Absolute delta of DC 100 mV
ACTIVE-IDLE-DELTA
common mode voltage
during L0 and electrical
idle
V
TX-CM-DC-LINE-
Absolute delta of DC 25 mV
DELTA
common mode voltgae
between TX+ and TX-
T
TX-IDLE-DATA
Max time to transition VID = 1.0 Vp-p, 8 Gbps 3.5 ns
to differential DATA
signal after IDLE
T
TX-DATA-IDLE
Max time to transition VID = 1.0 Vp-p, 8 Gbps 6.2 ns
to IDLE after differential
DATA signal
T
PLHD/PHLD
High to Low EQ = 00,
(2)
200 ps
and Low to High
Differential Propagation
Delay
T
LSK
Lane to lane skew T = 25C, VDD = 2.5V 25 ps
T
PPSK
Part to part propagation T = 25C, VDD = 2.5V 40 ps
delay skew
Equalization
(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 Submit Documentation Feedback Copyright © 2011–2012, Texas Instruments Incorporated
Product Folder Links: DS80PCI800