DS92LV1021AMSA National Semiconductor, DS92LV1021AMSA Datasheet

DS92LV1021AMSA

Manufacturer Part Number
DS92LV1021AMSA
Description
Manufacturer
National Semiconductor
Datasheet

Specifications of DS92LV1021AMSA

Number Of Elements
1
Number Of Receivers
10
Number Of Drivers
1
Input Type
CMOS/TTL
Operating Supply Voltage (typ)
3.3V
Output Type
Serializer
Differential Output Voltage
270mV
Transmission Data Rate
400Mbps
Power Dissipation
1.27W
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
28
Package Type
SSOP-EIAJ
Lead Free Status / Rohs Status
Not Compliant

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© 2003 National Semiconductor Corporation
DS92LV1021A
16-40 MHz 10 Bit Bus LVDS Serializer
General Description
The DS92LV1021A transforms a 10-bit wide parallel
LVCMOS/LVTTL data bus into a single high speed Bus
LVDS serial data stream with embedded clock. The
DS92LV1021A can transmit data over backplanes or cable.
The single differential pair data path makes PCB design
easier. In addition, the reduced cable, PCB trace count, and
connector size tremendously reduce cost. Since one output
transmits both clock and data bits serially, it eliminates clock-
to-data and data-to-data skew. The powerdown pin saves
power by reducing supply current when the device is not
being used. Upon power up of the Serializer, you can choose
to activate synchronization mode or use one of National
Semiconductor’s Deserializers in the synchronization-to-
random-data feature. By using the synchronization mode,
the Deserializer will establish lock to a signal within specified
lock times. In addition, the embedded clock guarantees a
Block Diagrams
TRI-STATE
®
is a registered trademark of National Semiconductor Corporation.
DS200269
transition on the bus every 12-bit cycle. This eliminates
transmission errors due to charged cable conditions. Fur-
thermore, you may put the DS92LV1021A output pins into
TRI-STATE
can lock to frequencies between 16 MHz and 40 MHz.
Features
n Guaranteed transition every data transfer cycle
n Single differential pair eliminates multi-channel skew
n Flow-through pinout for easy PCB layout
n 400 Mbps serial Bus LVDS bandwidth (at 40 MHz clock)
n 10-bit parallel interface for 1 byte data plus 2 control bits
n Programmable edge trigger on clock
n Bus LVDS serial output rated for 27Ω load
n Small 28-lead SSOP package-MSA
®
to achieve a high impedance state. The PLL
January 2003
www.national.com
20026901

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DS92LV1021AMSA Summary of contents

Page 1

... In addition, the embedded clock guarantees a Block Diagrams TRI-STATE ® registered trademark of National Semiconductor Corporation. © 2003 National Semiconductor Corporation transition on the bus every 12-bit cycle. This eliminates transmission errors due to charged cable conditions. Fur- thermore, you may put the DS92LV1021A output pins into TRI-STATE ® ...

Page 2

Block Diagrams (Continued) Functional Description The DS92LV1021A is an upgrade to the DS92LV1021. The DS92LV1021A no longer has a power-up sequence require- ment. Like the DS92LV1021, the DS92LV1021A is a 10-bit Serializer designed to transmit data over a differential back- ...

Page 3

... The device enters Powerdown when the PWRDN pin is driven low on the Serializer. In Ordering Information Order Number NSID DS92LV1021AMSA Powerdown, the PLL stops and the outputs go into TRI- STATE, disabling load current and reducing supply current into the milliamp range. To exit Powerdown, PWRDN must be driven high ...

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 ( CMOS/TTL Input Voltage −0. CMOS/TTL Output Voltage −0. Bus LVDS Receiver Input Voltage Bus LVDS Driver Output Voltage Bus LVDS Output Short ...

Page 5

Serializer Timing Requirements for TCLK Over recommended operating supply and temperature ranges unless otherwise specified. Symbol Parameter t Transmit Clock Period TCP t Transmit Clock High Time TCIH t Transmit Clock Low Time TCIL t TCLK Input Transition CLKT Time ...

Page 6

AC Timing Diagrams and Test Circuits FIGURE 1. “Worst Case” Serializer ICC Test Pattern FIGURE 2. Serializer Bus LVDS Output Load and Transition Times Timing shown for TCLK_R/F = LOW www.national.com FIGURE 3. Serializer Input Clock Transition Time FIGURE 4. ...

Page 7

AC Timing Diagrams and Test Circuits FIGURE 5. Serializer TRI-STATE Test Circuit and Timing FIGURE 6. Serializer PLL Lock Time, and PWRDN TRI-STATE Delays (Continued) 20026909 7 20026925 www.national.com ...

Page 8

AC Timing Diagrams and Test Circuits www.national.com (Continued) FIGURE 7. SYNC Timing Delays FIGURE 8. Serializer Delay 8 20026926 20026911 ...

Page 9

AC Timing Diagrams and Test Circuits For an explanation of the Ideal Crossing Point, please see the Application Information Section. FIGURE 9. Serializer Deterministic Jitter and Ideal Crossing Point Application Information DIFFERENCES BETWEEN THE DS92LV1021A AND THE DS92LV1021 The DS92LV1021A ...

Page 10

... In point-to-point configurations the trans- mission media need only be terminated at the receiver end. In the point-to-point configuration the potential of offsetting the ground levels of the Serializer vs. the Deserializer must be considered. Bus LVDS provides a plus / minus one volt common mode range at the receiver inputs. DS92LV1021AMSA - Serializer 20026918 10 ...

Page 11

Serializer Pin Description Pin Name I/O DIN I TCLK_R/F I DO+ O DO− O DEN I PWRDN I TCLK I SYNC I DVCC I DGND I AVCC I AGND I Truth Table DIN (0–9) TCLK_R/F TCLK ...

Page 12

... National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. inches (millimeters) Order Number DS92LV1021AMSA NS Package Number MSA28 2. A critical component is any component of a life ...

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