PI2EQX4402D_12 Datasheet, PDF (3/7 Pages) Pericom Semiconductor Corporation – 2.5 Gbps x2 Lane Serial PCI Express Repeater/Equalizer with Signal Detect feature

Pin Description (Continued)
Pin #
Pin Name
GI
DO+
HI
A9, A10, B9, C9
H6
H5
K5, K6
K7, K8
J7
DO-
EN_
[A,B,C,D]
CKIN-
CKIN+
OUT0+,
OUT0-
OUT1+,
OUT1-
IREF
K1
EN_CLK
C2, B2, A1, A2
SD_
[A,B,C,D]
PI2EQX4402D
2.5Gbps x2 Lane Serial PCI Express Repeater / Equalizer
with Signal Detect feature
I/O
Description
O
Positive CMLOutput Channel D with internal 50Ω pull up during normal operation
and 2KΩ pull up otherwise.
O
Negative CMLOutput Channel D with internal 50Ω pull up during normal opera-
tion and 2KΩ pull up otherwise.
I
EN_[A:D] is the enable pin with internal 50KΩ pull up resistor. A LVCMOS high
provides normal operation. A LVCMOS low selects a low power down mode.
I
Differential Input Reference Clock
I
O
Differential Reference Clock Output
O
O External 475Ω resistor connection to set the differential output current
Enable output clock pin with internal 50kΩ pull up resistor. When EN_CLK is
I
LVCMOS high level, the clock output operates normally. When EN_CLK = low,
the clock outputs are turned off for power savings. A clock is not required by the
data channels for operation.
Signal detected, channels A, B, C, D. Indicated a valid signal level on the channels
N/A input pin pair when active high. When low, SD indicates the input signal level is
below the signal detect threshold level.
Inputs
EN_[A, B, C, D]
High
Low
Outputs
O+ / O-
Normal output
No output
EN_CLK
High
Low
Inputs
Clock Outputs
Clock output
No clock output
Output Swing Control
SEL3_[A:D]
SEL4_[A:D]
0
0
0
1
1
0
1
1
Swing
1x
0.8x
1.2x
1.4x
Output De-emphasis Adjustment
SEL5_[A:D]
SEL6_[A:D]
0
0
0
1
1
0
1
1
Equalizer Selection
SEL0_[A:D] SEL1_[A:D]
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
SEL2_[A:D]
0
1
0
1
0
1
0
1
Compliance Channel
No Equalization
[0:1.5dB] @ 1.25 GHz
[0:2.5dB] @ 1.25 GHz
[0:3.5dB] @ 1.25 GHz
[0:4.5dB] @ 1.25 GHz
[0:5.5dB] @ 1.25 GHz
[0:6.5dB] @ 1.25 GHz
[0:7.5dB] @ 1.25 GHz
De-emphasis
0dB
-2.5dB
-3.5dB
-4.5dB
12-0256
3
PS8875C
07/17/07