28 of 59 December 12, 2013
IDT 89HPES48H12AG2 Datasheet
DC Electrical Characteristics
Values based on systems running at recommended supply voltages, as shown in Table 14.
Note: See Table 9, Pin Characteristics, for a complete I/O listing.
I/O Type Parameter Description
Gen1 Gen2 Unit
Condi-
tions
Min
1
Typ
1
Max
1
Min
1
Typ
1
Max
1
Serial Link PCIe Transmit
V
TX-DIFFp-p
Differential peak-to-peak output
voltage
800 1200 800 1200 mV
V
TX-DIFFp-p-LOW
Low-Drive Differential Peak to
Peak Output Voltage
400 1200 400 1200 mV
V
TX-DE-RATIO-
3.5dB
De-emphasized differential output
voltage
-3 -4 -3.0 -3.5 -4.0 dB
V
TX-DE-RATIO-
6.0dB
De-emphasized differential output
voltage
NA -5.5 -6.0 -6.5 dB
V
TX-DC-CM
DC Common mode voltage 0 3.6 0 3.6 V
V
TX-CM-ACP
RMS AC peak common mode
output voltage
20 mV
V
TX-CM-DC-active-
idle-delta
Abs delta of DC common mode
voltage between L0 and idle
100 100 mV
V
TX-CM-DC-line-
delta
Abs delta of DC common mode
voltage between D+ and D-
25 25 mV
V
TX-Idle-DiffP
Electrical idle diff peak output 20 20 mV
RL
TX-DIFF
Transmitter Differential Return
loss
10 10 dB 0.05 - 1.25GHz
8 dB 1.25 - 2.5GHz
RL
TX-CM
Transmitter Common Mode
Return loss
66dB
Z
TX-DIFF-DC
DC Differential TX impedance 80 100 120 120
VTX-CM-ACpp Peak-Peak AC Common NA 100 mV
V
TX-DC-CM
Transmit Driver DC Common
Mode Voltage
0 3.6 0 3.6 V
V
TX-RCV-DETECT
The amount of voltage change
allowed during Receiver Detec-
tion
600 600 mV
I
TX-SHORT
Transmitter Short Circuit Current
Limit
090 90mA
Table 19 DC Electrical Characteristics (Part 1 of 2)
