DS25BR204TSQ/NOPB National Semiconductor, DS25BR204TSQ/NOPB Datasheet

IC REPEATER 3.125GBPS 1:4 40LLP

DS25BR204TSQ/NOPB

Manufacturer Part Number
DS25BR204TSQ/NOPB
Description
IC REPEATER 3.125GBPS 1:4 40LLP
Manufacturer
National Semiconductor
Type
Repeaterr
Datasheet

Specifications of DS25BR204TSQ/NOPB

Tx/rx Type
LVDS
Delay Time
600ps
Capacitance - Input
1.7pF
Voltage - Supply
3 V ~ 3.6 V
Current - Supply
185mA
Mounting Type
Surface Mount
Package / Case
40-LLP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
DS25BR204TSQTR

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
DS25BR204TSQ/NOPB
Manufacturer:
NSC
Quantity:
500
Part Number:
DS25BR204TSQ/NOPB
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© 2008 National Semiconductor Corporation
DS25BR204
3.125 Gbps 1:4 LVDS Repeater with Transmit Pre-
Emphasis and Receive Equalization
General Description
The DS25BR204 is a 3.125 Gbps 1:4 LVDS repeater opti-
mized for high-speed signal routing and switching over lossy
FR-4 printed circuit board backplanes and balanced cables.
Fully differential signal paths ensure exceptional signal in-
tegrity and noise immunity.
The device has two different LVDS input channels and a se-
lect line determines which input is active. Both inputs have
programmable equalization providing maximum signal
strength. A loss-of-signal (LOS) circuit monitors both input
channels and a unique LOS pin reports when no signal is de-
tected at that input.
Wide input common mode range allows the switch to accept
signals with LVDS, CML and LVPECL levels; the output levels
are LVDS. A very small package footprint requires a minimal
space on the board while the flow-through pinout allows easy
board layout. Each differential input and output is internally
terminated with a 100Ω resistor to lower device return losses,
reduce component count and further minimize board space.
Typical Application
300077
Features
Applications
DC - 3.125 Gbps low jitter, low skew, low power operation
Pin selectable transmit pre-emphasis and receive
equalization eliminate data dependant jitter
Wide Input Common Mode Range allows DC-coupled
interface to LVDS, CML and LVPECL drivers
Redundant inputs
Integrated 100Ω input and output terminations
8 kV ESD on LVDS I/O pins protects adjoining
components
Small 6 mm x 6 mm LLP-40 space saving package
Clock and data distribution
Clock and data buffering and muxing
OC-48 / STM-16
SD/HD/3GHD SDI Routers
30007703
January 18, 2008
www.national.com

Related parts for DS25BR204TSQ/NOPB

DS25BR204TSQ/NOPB Summary of contents

Page 1

... Each differential input and output is internally terminated with a 100Ω resistor to lower device return losses, reduce component count and further minimize board space. Typical Application © 2008 National Semiconductor Corporation Features ■ 3.125 Gbps low jitter, low skew, low power operation ■ ...

Page 2

Ordering Code NSID Function DS25BR204TSQ 1:4 Repeater Block Diagram Connection Diagram www.national.com Available Equalization Levels Off / On 30007701 DS25BR204 Pin Diagram 2 Available Pre-Emphasis Levels Off / On 30007702 ...

Page 3

Pin Descriptions Pin Name Pin Number IN1+, IN1 IN2+, IN2 OUT0+, OUT0-, 29, 28, OUT1+, OUT1-, 27, 26, OUT2+, OUT2-, 24, 23, OUT3+, OUT3- 22, 21 EQ1, EQ2, 39,11 PE0, PE1, 31, 20, PE2, PE3 19, ...

Page 4

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage LVCMOS Input Voltage LVCMOS Output Voltage LVDS Input Voltage LVDS Differential Input Voltage LVDS Output Voltage LVDS Differential Output Voltage ...

Page 5

Symbol Parameter LVDS OUTPUT DC SPECIFICATIONS V Differential Output Voltage OD ΔV Change in Magnitude Output States V Offset Voltage OS ΔV Change in Magnitude Output States I Output Short Circuit Current ...

Page 6

AC Electrical Characteristics Over recommended operating supply and temperature ranges unless otherwise specified. (Notes 9, 10) Symbol Parameter LVDS OUTPUT AC SPECIFICATIONS t Differential Propagation Delay Low to PLHD High (Note 11) t Differential Propagation Delay High to PHLD Low ...

Page 7

Symbol Parameter JITTER PERFORMANCE WITH (Note 11)(Figure 8 Figure 9 t Random Jitter (RMS Value) RJ1BD Input Test Channel D t RJ2BD Output Test Channel B (Note 15) t Deterministic Jitter (Peak to Peak) ...

Page 8

DC Test Circuits AC Test Circuits and Timing Diagrams www.national.com FIGURE 1. Differential Driver DC Test Circuit FIGURE 2. Differential Driver AC Test Circuit FIGURE 3. Propagation Delay Timing Diagram FIGURE 4. LVDS Output Transition Times 8 30007720 30007721 30007722 ...

Page 9

Pre-Emphasis and Equalization Test Circuits FIGURE 6. Pre-emphasis Performance Test Circuit FIGURE 7. Equalization Performance Test Circuit FIGURE 5. Jitter Performance Test Circuit 9 30007729 30007727 30007726 www.national.com ...

Page 10

FIGURE 8. Pre-emphasis and Equalization Performance Test Circuit Test Channel Loss Characteristics The test channel was fabricated with Polyclad PCL-FR-370- Laminate/PCL-FRP-370 Prepreg materials (Dielectric con- stant of 3.7 and Loss Tangent of 0.02). The edge coupled differential striplines have the ...

Page 11

Functional Description The DS25BR204 is a 3.125 Gbps 1:4 LVDS repeater opti- mized for high-speed signal routing and switching over lossy FR-4 printed circuit board backplanes and balanced cables. Input Select Truth Table CONTROL Pin (SEL_in) State 0 1 The ...

Page 12

Input Interfacing The DS25BR204 accepts differential signals and allows sim- ple coupling. With a wide common mode range, the DS25BR204 can be DC-coupled with all common differential Typical LVDS Driver DC-Coupled Interface to an DS25BR204 Input Typical ...

Page 13

Output Interfacing The DS25BR204 outputs signals compliant to the LVDS stan- dard. Its outputs can be DC-coupled to most common differ- ential receivers. The following figure illustrates typical DC- coupled interface to common differential receivers and Typical DS25BR204 Output DC-Coupled ...

Page 14

Typical Performance Total Jitter as a Function of Data Rate Residual Jitter as a Function of Data Rate, FR4 Stripline Length and EQ Level www.national.com 30007750 Residual Jitter as a Function of Data Rate, FR4 Stripline 30007751 Supply Current as ...

Page 15

Physical Dimensions inches (millimeters) unless otherwise noted (See AN-1187 for PCB Design and Assembly Recommendations) Order Number DS25BR204TSQ NS Package Number SQA40A 15 www.national.com ...

Page 16

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock Conditioners www.national.com/timing Data Converters www.national.com/adc Displays www.national.com/displays Ethernet www.national.com/ethernet Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www ...

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