Datasheet

DS50PCI401
www.ti.com SNLS292J –JUNE 2009–REVISED APRIL 2013
Electrical Characteristics (continued)
Over recommended operating supply and temperature ranges with default register settings unless other specified.
(1) (2)
Symbol Parameter Conditions Min Typ Max Units
V
TX-DE-RATIO-6
Tx de-emphasis level VOD = 1000 mV, DEM1 = VDD,
6 dB
ratio DEM0 = GND,
(1)
,
(7)
T
TX-HF-DJ-DD
Tx Dj > 1.5 Mhz
(8)
0.15 UI
T
TX-LF-RMS
Tx RMS jitter < 1.5Mhz
(8)
3.0 ps RMS
T
TX-RISE-FALL
Transmitter Rise/ Fall 20% to 80% of differential output
Time voltage, Figure 3 50 67 ps
(1) (9)
T
RF-MISMATCH
Tx rise/fall mismatch 20% to 80% of differential output
0.01 0.1 UI
voltage
(1) (9)
RL
TX-DIFF
Differential Output 0.05- 1.25 Ghz, See Figure 6 -23 dB
Return Loss
1.25- 2.5 Ghz, See Figure 6 -20 dB
RL
TX-CM
Common Mode Return 0.05- 2.5 Ghz, See Figure 6
-11 dB
Loss
Z
TX-DIFF-DC
DC differential Tx
100 Ω
impedance
V
TX-CM-AC-PP
Tx AC common mode
100 mVpp
voltage
I
TX-SHORT
transmitter short circuit Total current transmitter can
current limit supply when shorted to VDD or 90 mA
GND
V
TX-CM-DC- ACTIVE-IDLE-
Absolute Delta of DC
DELTA
Common Mode Voltage
40 mV
during L0 and electrical
Idle
V
TX-CM-DC- LINE-DELTA
Absolute Delta of DC
Common Mode Voltage 25 mV
between Tx+ and Tx-
T
TX-IDLE-SET-TO -IDLE
Max time to transition VIN = 800 mVp-p, 5 Gbps,
to valid diff signaling Figure 5
6.5 9.5 nS
after leaving Electrical
Idle
T
TX-IDLE-TO -DIFF-DATA
Max time to transition VIN = 800 mVp-p, 5 Gbps,
to valid diff signaling Figure 5
5.5 8 nS
after leaving Electrical
Idle
T
PDEQ
Differential Propagation EQ = 11,
Delay +4.0 dB @ 2.5 GHz , Figure 4 150 200 250 ps
(10)
T
PD
Differential Propagation EQ = FF,
Delay Equalizer Bypass, Figure 4 120 170 220 ps
(10) (11)
T
LSK
Lane to Lane Skew in a T
A
= 25C,V
DD
= 2.5V
27 ps
Single Part
(12) (11)
T
PPSK
Part to Part T
A
= 25C,V
DD
= 2.5V
Propagation Delay 35 ps
Skew
(8) PCIe 2.0 transmit jitter specifications - actual device jitter is much less. Actual device Rj and Dj has been characterized and specified
with test loads outlined in the EQUALIZATION and DE-EMPHASIS sections of the Electrical Characteristics table.
(9) Guaranteed by device characterization
(10) Propagation Delay measurements will change slightly based on the level of EQ selected. EQ Bypass will result in the shortest
propagation delays.
(11) Propagation Delay measurements for Part to Part skew are all based on devices operating under indentical temperature and supply
voltage conditions.
(12) Guaranteed by device characterization
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