89HPES8T5 Datasheet, PDF (17/31 Pages) Integrated Device Technology – Low-latency cut-through switch architecture

IDT 89HPES8T5 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
Min¹
Typ¹
Max¹ Unit
Serial Link PCIe Transmit
V_TX-DIFFp-p Differential peak-to-peak output voltage
800
V_TX-DE-RATIO De-emphasized differential output voltage -3
V_TX-DC-CM DC Common mode voltage
-0.1
V_TX-CM-ACP RMS AC peak common mode output volt-
age
1200 mV
-4
dB
1
3.7
V
20
mV
V_TX-CM-DC- Abs delta of DC common mode voltage
active-idle-delta ^{between L0 and idle}
100
mV
V_{TX-CM-DC-line-} Abs delta of DC common mode voltage
delta
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 TX Eye Height (De-emphasized bits)
505
650
mV
Diagram
Transmitter Eye TX Eye Height (Transition bits)
800
950
mV
Diagram
PCIe Receive
V_RX-DIFFp-p Differential input voltage (peak-to-peak)
175
V_RX-CM-AC
Receiver common-mode voltage for AC
coupling
1200 mV
150
mV
RL_RX-DIFF Receiver Differential Return Loss
15
RL_RX-CM Receiver Common Mode Return Loss
6
Z_RX-DIFF-DC Differential input impedance (DC)
80
100
Z_RX-COMM-DC Single-ended input impedance
40
50
Z_{RX-COMM-HIGH-} Powered down input common mode
Z-DC
impedance (DC)
200k
350k
V_RX-IDLE-DET- Electrical idle detect threshold
65
DIFFp-p
PCIe REFCLK
dB
dB
120
Ω
60
Ω
Ω
175
mV
C_IN
Input Capacitance
1.5
—
pF
Table 18 DC Electrical Characteristics (Part 1 of 2)
Conditions
17 of 31
March 27, 2008