SCAN25100TYA/NOPB National Semiconductor, SCAN25100TYA/NOPB Datasheet - Page 31

• Manufacturer Part Number: SCAN25100TYA/NOPB
• Description: IC SERIAL/DESERIAL CPRI 100-TQFP
• Manufacturer: National Semiconductor
• Series: SCANr

Specifications of SCAN25100TYA/NOPB

• Function: Serializer/Deserializer
• Data Rate: 2.5Gbps
• Input Type: LVTTL/LVCMOS
• Output Type: LVTTL, LVCMOS
• Number Of Inputs: 10
• Number Of Outputs: 10
• Voltage - Supply: 1.7 V ~ 1.9 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 100-TQFP Exposed Pad, 100-eTQFP, 100-HTQFP, 100-VQFP
• Operating Temperature (min): -40C
• Operating Temperature Classification: Industrial
• Operating Temperature (max): 85C
• Package Type: TQFP EP
• Rad Hardened: No
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: SCAN25100TYA

Bit
D15–D0
Bit
D15–D8
D7
D6
D5
D4–D0
Tout-in Lower
Tout-in Upper
Design and Layout Guidelines
The SCAN25100 is a 2457.6, 1228.8, and 614.4 Mbps seri-
alizer/deseralizer (SerDes) for high-speed bidirectional serial
data transmission over FR-4 printed circuit board backplanes,
balanced cables, and optical fiber. This high-speed operation
is achieved without significant layout and overall PCB design
constraints. However, adhering to a few specific layout guide-
lines will optimize signal integrity and performance. The fol-
lowing list of topics is covered in National Semiconductor
AN-1463.
Address 28h Value: 0000h
Address 29h Value: 0000h
Default
16'd0
Default
8'd0
1'd0
1'd0
1'd0
5'd0
Bit Name
Tout-in Lower
Bit Name
Reserved
DCM Error
DCM Ready
Reserved
Tout-in Upper
Access
Access
RO
RO
RO
RO
RO
RO
Bit Description
Lower 16 Tout-in DCM bits. Tout-in is defined as the delay between the
Rx parallel outputs and the Tx parallel inputs.
Bit Description
Reserved for future use. Returns undefined value when read.
This bit is set to [1] if LOF is detected during DCM measurement
DCM results ready when this bit is [1]
Reserved for future use. Returns undefined value when read.
Upper 5 Tout-in DCM bits. Tout-in is defined as the delay between the
Rx parallel outputs and the Tx parallel inputs.
31
1.
2.
3.
4.
5.
6.
7.
AC coupling capacitor placement, size and value.
High speed differential signaling options (microstrip /
stripline / twin-ax cable)
REFCLK terminations
DDR impedance recommendations
Decoupling
Power Filtering
Thermal recommendations
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