DS50PCI401SQE/NOPB National Semiconductor, DS50PCI401SQE/NOPB Datasheet - Page 6

• Manufacturer Part Number: DS50PCI401SQE/NOPB
• Description: IC PCI-E 5GBPS REPEATER 54LLP
• Manufacturer: National Semiconductor
• Type: Repeaterr

Specifications of DS50PCI401SQE/NOPB

• Tx/rx Type: CML/LPDS
• Delay Time: 200ps
• Capacitance - Input: 10pF
• Voltage - Supply: 2.375 V ~ 2.625 V
• Mounting Type: Surface Mount
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Other names: DS50PCI401SQETR

www.national.com
Functional Description
The DS50PCI401 is a low power media compensation 4 lane
repeater optimized for PCI Express Gen 1 and Gen 2 media
including lossy FR-4 printed circuit board backplanes and
balanced cables. The DS50PCI401 operates in two modes:
Pin Control Mode (ENSMB = 0) and SMBus Mode (ENSMB
= 1).
Pin Control Mode:
When in pin mode (ENSMB = 0) , the repeater is configurable
with external pins. Equalization and de-emphasis can be se-
lected via pin for each side independently. When de-empha-
sis is asserted VOD is automatically increased per the De-
Emphasis table below for improved performance over lossy
media. The receiver detect pins RXDETA/B provide manual
control for input termination (50Ω or >50KΩ). Rate optimiza-
tion is also pin controllable, with pin selections for 2.5Gbps,
RATE
0/F
0/F
0/F
0/F
0/F
0/F
0/F
0/F
0/F
1/F
1/F
1/F
1/F
1/F
1/F
1/F
1/F
EQ1
F
1
0
F
1
F
0
0
1
F=Float (don't drive pin, each float pin has an internal 50K Ohm resistor to VDD and GND), 1=High, 0=Low
DEM1 DEM0
F
F
F
F
F
0
0
1
1
0
1
0
0
1
1
0
1
EQ0
F
F
F
1
0
0
0
1
1
F
F
F
F
F
0
1
0
1
0
1
0
1
0
1
0
1
TABLE 2. De-Emphasis Input Select Pins for A and B ports (3–Level Input)
TABLE 1. Equalization Input Select Pins for A and B ports (3–Level Input)
Emphasis Level
Reserved, don't
Approx. 11.4 dB at 2.5Ghz
Approx. 15.5 dB at 2.5Ghz
Approx. 20.6 dB at 2.5Ghz
Approx. 26.3 dB at 2.5Ghz
Approx. 9.6 dB at 2.5GHz
Approx.19.1 dB at 2.5Ghz
Approx. 17 dB at 2.5Ghz
Typical De-
Approx. 4 dB at 2.5Ghz
Equalization Level
-3.5dB
-3.5dB
-12dB
-12dB
-12dB
-12dB
-6dB
-6dB
-9dB
-9dB
-6dB
-6dB
-9dB
-9dB
0dB
0dB
use
Off
Typical DE Pulse
400ps enhanced
400ps enhanced
400ps enhanced
400ps enhanced
400ps enhanced
200ps enhanced
200ps enhanced
200ps enhanced
200ps enhanced
200ps enhanced
Width
400ps
400ps
200ps
200ps
0ps
0ps
8 inches FR4 (6-mil trace) or less than 1 meter (28 AWG) PCIe
50 inches FR4 (6-mil trace) or 10 meters (24 AWG) PCIe cable
6
20 inches FR4 (6-mil trace) or 5 meters (26 AWG) PCIe cable
30 inches FR4 (6-mil trace) or 7 meters (24 AWG) PCIe cable
40 inches FR4 (6-mil trace) or 9 meters (24 AWG) PCIe cable
14 inches FR4 (6-mil trace) or 1 meter (28 AWG) PCIe cable
5Gbps, and auto detect. The receiver electrical idle detect
threshold is also programmable via an optional external re-
sistor on the SD_TH pin.
SMBUS Mode:
When in SMBus mode the equalization, de-emphasis, and
termination disable features are all programmable on a indi-
vidual lane basis, instead of grouped by sides as in the pin
mode case. Upon assertion of ENSMB the RATE, EQx and
DEMx functions revert to register control immediately. The
EQx and DEMx pins are converted to AD0-AD3 SMBus ad-
dress inputs. The other external control pins remain active
unless their respective registers are written to and the appro-
priate override bit is set, in which case they are ignored until
ENSMB is driven low. On powerup and when ENSMB is driv-
en low all registers are reset to their default state. If PRSNT
is asserted while ENSMB is high, the registers retain their
current state.
Typical VOD
1000mV
1000mV
1000mV
1000mV
1000mV
1000mV
1200mV
1400mV
1000mV
1000mV
1000mV
1000mV
1000mV
1000mV
1200mV
1400mV
>15 meters (24 AWG) PCIe cable
15 meters (24 AWG) PCIe cable
Suggested Use
8 inches FR4 (6-mil trace) or less than 1
Bypass
cable
meter (28 AWG) PCIe cable
15 inches FR4 (6-mil trace)
30 inches FR4 (6-mil trace)
40 inches FR4 (6-mil trace)
10 inches FR4 (6-mil trace)
20 inches FR4 (6-mil trace)
30 inches FR4 (6-mil trace)
Suggested Use