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PDF DS91M125 Data sheet ( Hoja de datos )
| Número de pieza | DS91M125 | |
| Descripción | 125 MHz 1:4 M-LVDS Repeater | |
| Fabricantes | National Semiconductor | |
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DS91M125
November 9, 2009
125 MHz 1:4 M-LVDS Repeater with LVDS Input
General Description
The DS91M125 is a 1:4 M-LVDS repeater designed for driv-
ing and distributing clock or data signals to up to four multi-
point networks.
M-LVDS (Multipoint LVDS) is a new family of bus interface
devices based on LVDS technology specifically designed for
multipoint and multidrop cable and backplane applications. It
differs from standard LVDS in providing increased drive cur-
rent to handle double terminations that are required in multi-
point applications. Controlled transition times minimize re-
flections that are common in multipoint configurations due to
unterminated stubs.
A single DS91M125 channel is a 1:4 repeater that accepts
M-LVDS/LVDS/CML/LVPECL signals and converts them to
M-LVDS signal levels. Each output has an associated inde-
pendent driver enable pin. The DS91M125 input conforms to
the LVDS standard.
The DS91M125 has a flow-through pinout for easy PCB lay-
out. It provides a new alternative for high speed multipoint
interface applications. It is packaged in a space saving
SOIC-16 package.
Features
■ DC - 125 MHz / 250 Mbps low jitter, low skew, low power
operation
■ Independent Driver Enable pins
■ Outputs Conform to TIA/EIA-899 M-LVDS Standard
■ Controlled transition times minimize reflections
■ Inputs Conform to TIA/EIA-644-A LVDS Standard
■ 8 kV ESD on M-LVDS output pins protects adjoining
components
■ Flow-through pinout simplifies PCB layout
■ Industrial operating temperature range (−40°C to +85°C)
■ Available in a space saving SOIC-16 package
Applications
■ Multidrop / Multipoint clock and data distribution
■ High-Speed, Low Power, Short-Reach alternative to
TIA/EIA-485/422
■ Clock distribution in AdvancedTCA (ATCA) and MicroTCA
(μTCA, uTCA) backplanes
Typical Application
© 2009 National Semiconductor Corporation 300542
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1 page  
Switching Characteristics
Over recommended operating supply and temperature ranges unless otherwise specified. (Note 11, Note 12, Note 18)
Symbol
Parameter
Conditions
Min Typ Max
DRIVER AC SPECIFICATION
tPLH
tPHL
tSKD1 (tsk(p))
Differential Propagation Delay Low to High
Differential Propagation Delay High to Low
Pulse Skew |tPLHD − tPHLD| (Note 14, Note
19)
RL = 50Ω, CL = 5 pF,
CD = 0.5 pF
Figures 6, 7
3.0 5.5 8.5
3.0 5.5 8.5
65 350
tSKD2
Channel-to-Channel Skew (Note 15, Note
19)
65 400
tSKD3
tSKD4
tTLH (tr)
tTHL (tf)
tPZH
tPZL
tPLZ
tPHZ
fMAX
Part-to-Part Skew (Note 16, Note 19)
Part-to-Part Skew (Note 17)
Rise Time (Note 19)
Fall Time (Note 19)
Enable Time (Z to Active High)
Enable Time (Z to Active Low )
Disable Time (Active Low to Z)
Disable Time (Active High to Z)
Maximum Operating Frequency (Note 19)
RL = 50Ω, CL = 5 pF,
CD = 0.5 pF
Figures 8, 9
2.2 2.5
5.5
1.1 2.0 3.0
1.1 2.0 3.0
6 11
6 11
6 11
6 11
125
Units
ns
ns
ps
ps
ns
ns
ns
ns
ns
ns
ns
ns
MHz
Note 11: The Electrical Characteristics tables list guaranteed specifications under the listed Recommended Operating Conditions except as otherwise modified
or specified by the Electrical Characteristics Conditions and/or Notes.
Note 12: Typical values represent most likely parametric norms for VDD = +3.3V and TA = +25°C, and at the Recommended Operation Conditions at the time of
product characterization and are not guaranteed.
Note 13: Specification is guaranteed by characterization and is not tested in production.
Note 14: tSKD1, |tPLHD − tPHLD|, is the magnitude difference in differential propagation delay time between the positive going edge and the negative going edge of
the same channel.
Note 15: tSKD2, Channel-to-Channel Skew, is the difference in propagation delay (tPLHD or tPHLD) among all output channels.
Note 16: tSKD3, Part-to-Part Skew, is defined as the difference between the minimum and maximum specified differential propagation delays. This specification
applies to devices at the same VDD and within 5°C of each other within the operating temperature range.
Note 17: tSKD4, Part-to-Part Skew, is the differential channel-to-channel skew of any event between devices. This specification applies to devices over
recommended operating temperature and voltage ranges, and across process distribution. tSKD4 is defined as |Max − Min| differential propagation delay.
Note 18: CL includes fixture capacitance and CD includes probe capacitance.
Note 19: Specification is guaranteed by characterization and is not tested in production.
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Notes
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| PDF Descargar | [ Datasheet DS91M125.PDF ] | |
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