20 of 36 October 3, 2011
IDT 89HPES16H16 Data Sheet
DC Electrical Characteristics
Values based on systems running at recommended supply voltages, as shown in Table 13.
Note: See Table 8, Pin Characteristics, for a complete I/O listing.
I/O Type Parameter Description Min
1
Typ
1
Max
1
Unit Conditions
Serial Link PCIe Transmit
V
TX-DIFFp-p
Differential peak-to-peak output voltage 800 1200 mV
V
TX-DE-RATIO
De-emphasized differential output voltage -3 -4 dB
V
TX-DC-CM
DC Common mode voltage -0.1 1 3.7 V
V
TX-CM-ACP
RMS AC peak common mode output volt-
age
20 mV
V
TX-CM-DC-
active-idle-delta
Abs delta of DC common mode voltage
between L0 and idle
100 mV
V
TX-CM-DC-line-
delta
Abs delta of DC common mode voltage
between D+ and D-
25 mV
V
TX-Idle-DiffP
Electrical idle diff peak output 20 mV
V
TX-RCV-Detect
Voltage change during receiver detection 600 mV
RL
TX-DIFF
Transmitter Differential Return loss 12 dB
RL
TX-CM
Transmitter Common Mode Return loss 6 dB
Z
TX-DEFF-DC
DC Differential TX impedance 80 100 120 Ω
Z
OSE
Single ended TX Impedance 40 50 60 Ω
Transmitter Eye
Diagram
TX Eye Height (De-emphasized bits) 505 650 mV
Transmitter Eye
Diagram
TX Eye Height (Transition bits) 800 950 mV
PCIe Receive
V
RX-DIFFp-p
Differential input voltage (peak-to-peak) 175 1200 mV
V
RX-CM-AC
Receiver common-mode voltage for AC
coupling
150 mV
RL
RX-DIFF
Receiver Differential Return Loss 15 dB
RL
RX-CM
Receiver Common Mode Return Loss 6 dB
Z
RX-DIFF-DC
Differential input impedance (DC) 80 100 120 Ω
Z
RX-COMM-DC
Single-ended input impedance 40 50 60 Ω
Z
RX-COMM-HIGH-
Z-DC
Powered down input common mode
impedance (DC)
200k 350k Ω
V
RX-IDLE-DET-
DIFFp-p
Electrical idle detect threshold 65 175 mV
PCIe REFCLK
C
IN
Input Capacitance 1.5 — pF
Table 18 DC Electrical Characteristics (Part 1 of 2)
