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PDF DS10BR254 Data sheet ( Hoja de datos )
| Número de pieza | DS10BR254 | |
| Descripción | 1.5 Gbps 1:4 LVDS Repeater | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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December 14, 2007
www.DataSheet4U.com
DS10BR254
1.5 Gbps 1:4 LVDS Repeater
General Description
The DS10BR254 is a 1.5 Gbps 1:4 LVDS repeater optimized
for high-speed signal routing and distribution over FR-4 print-
ed circuit board backplanes and balanced cables. Fully dif-
ferential signal paths ensure exceptional signal integrity and
noise immunity.
The device has two different LVDS input channels and a se-
lect pin determines which input is active. A loss-of-signal
(LOS) circuit monitors both input channels and a unique
LOS pin is asserted when no signal is detected 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.
Features
■ DC - 1.5 Gbps low jitter, low skew, low power operation
■ Wide Input Common Mode Voltage Range allows for DC-
coupled interface to LVDS, CML and LVPECL drivers
■ Redundant inputs
■ LOS circuitry detects open inputs fault condition
■ 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
Applications
■ Clock distribution
■ Clock and data buffering and muxing
■ OC-12 / STM-4
■ SD/HD SDI Routers
Typical Application
© 2007 National Semiconductor Corporation 300078
30007803
www.national.com
1 page  
Symbol
Parameter
LVDS OUTPUT DC SPECIFICATIONS
VOD
ΔVOD
Differential Output Voltage
wwCwh.aDnagteaSinheMeat4gUn.ictuodme of VOD for Complimentary
Output States
VOS
ΔVOS
Offset Voltage
Change in Magnitude of VOS for Complimentary
Output States
IOS Output Short Circuit Current (Note 8)
COUT Output Capacitance
ROUT Output Termination Resistor
SUPPLY CURRENT
ICC Supply Current
ICCZ Power Down Supply Current
Conditions
RL = 100Ω
RL = 100Ω
OUT to GND
OUT to VCC
Any LVDS Output Pin to GND
Between OUT+ and OUT-
PWDN = H
PWDN = L
Min Typ Max Units
250
-35
1.05
-35
350 450
35
1.2 1.375
35
-35 -55
7 55
1.2
100
mV
mV
V
mV
mA
mA
pF
Ω
113 135
50 60
mA
mA
Note 4: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur, including inoperability and degradation of device reliability
and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or other conditions beyond those indicated in
the Recommended Operating Conditions is not implied. The Recommended Operating Conditions indicate conditions at which the device is functional and the
device should not be operated beyond such conditions.
Note 5: 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. Typical specifications are estimations only and are not guaranteed.
Note 6: Current into device pins is defined as positive. Current out of device pins is defined as negative. All voltages are referenced to ground except VOD and
ΔVOD.
Note 7: Typical values represent most likely parametric norms for VCC = +3.3V and TA = +25°C, and at the Recommended Operation Conditions at the time of
product characterization and are not guaranteed.
Note 8: Output short circuit current (IOS) is specified as magnitude only, minus sign indicates direction only.
5 www.national.com
5 Page 
Typical Performance
www.DataSheet4U.com
30007863
A 1.5 Gbps NRZ PRBS-7 After 2"
Differential FR-4 Stripline
V:100 mV / DIV, H:100 ps / DIV
30007862
A 1.06 Gbps NRZ PRBS-7 After 2"
Differential FR-4 Stripline
V:100 mV / DIV, H:200 ps / DIV
30007861
A 622 Mbps NRZ PRBS-7 After 2"
Differential FR-4 Stripline
V:100 mV / DIV, H:200 ps / DIV
30007860
A 270 Mbps NRZ PRBS-7 After 2"
Differential FR-4 Stripline
V:100 mV / DIV, H:500 ps / DIV
30007870
Supply Current as a Function of a Number of Outputs Used
11
www.national.com
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet DS10BR254.PDF ] | |
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