Datasheet

XIO2213B
SCPS210F –OCTOBER 2008–REVISED MAY 2013 www.ti.com
PCIe Differential Transmitter Output Ranges (continued)
TXP and TXN
PARAMETER MIN NOM MAX UNIT COMMENTS
After sending an electrical idle ordered set, the
Maximum time to transition
transmitter must meet all electrical idle
to a valid electrical idle after
T
TX-IDLE-SET-to-IDLE
20 UI specifications within this time. This is considered a
sending an electrical idle
debounce time for the transmitter to meet electrical
ordered set
idle after transitioning from L0.
Maximum time to meet all TX specifications when
Maximum time to transition
transitioning from electrical idle to sending
to valid TX specifications
T
TX-IDLE-to-DIFF-DATA
20 UI differential data. This is considered a debounce time
after leaving an electrical
for the TX to meet all TX specifications after leaving
idle condition
electrical idle.
RL
TX-DIFF
Differential return loss 10 dB Measured over 50 MHz to 1.25 GHz
(5)
RL
TX-CM
Common-mode return loss 6 dB
Measured over 50 MHz to 1.25 GHz
(5)
DC differential TX
Z
TX-DIFF-DC
80 100 120 Ω TX dc differential mode low impedance
impedance
Required TXP as well as TXN dc impedance during
Z
TX-DC
Transmitter dc impedance 40 Ω
all states
All transmitters are ac coupled and are required on
C
TX
AC coupling capacitor 75 200 nF
the PWB.
(5) The transmitter input impedance results in a differential return loss greater than or equal to 12 dB and a common-mode return loss
greater than or equal to 6 dB over a frequency range of 50 MHz to 1.25 GHz. This input impedance requirement applies to all valid input
levels. The reference impedance for return loss measurements is 50 to ground for both the P and N lines. Note that the series
capacitors C
TX
is optional for the return loss measurement.
192 Electrical Characteristics Copyright © 2008–2013, Texas Instruments Incorporated
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