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LFSC Datasheet(PDF) 54 Page - Lattice Semiconductor

Part # LFSC
Description  LatticeSC/M Family Data Sheet
PDF  237 Pages
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Manufacturer  LATTICE [Lattice Semiconductor]
Direct Link  http://www.latticesemi.com
Logo LATTICE - Lattice Semiconductor

LFSC Datasheet(HTML) 54 Page - Lattice Semiconductor

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3-10
DC and Switching Characteristics
Lattice Semiconductor
LatticeSC/M Family Data Sheet
LVPECL
The LatticeSC devices support differential LVPECL standard. This standard is emulated using controlled imped-
ance complementary LVCMOS outputs in conjunction with a parallel resistor across the driver outputs. The scheme
shown in Figure 3-3 is one possible solution for point-to-point signals.
Figure 3-3. Differential LVPECL
Table 3-3. LVPECL DC Conditions
1
Over Recommended Operating Conditions
For further information on LVPECL, BLVDS, MLVDS and other differential interfaces please see details of additional
technical documentation at the end of this data sheet.
On-die Differential Common Mode Termination
Symbol
Description
Nominal
Units
ZOUT
Output impedance
16
ohm
RS
Driver series resistor
85
ohm
RP
Driver parallel resistor
150
ohm
RT
Receiver termination
100
ohm
VOH
Output high voltage
2.03
V
VOL
Output low voltage
1.27
V
VOD
Output differential voltage
0.76
V
VCM
Output common mode voltage
1.65
V
ZBACK
Back impedance
86
ohm
IDC
DC output current
12.6
mA
1. For input buffer, see LVDS table.
Symbol
Description
Min.
Typ.
Max.
Units
CCMT
Capacitance VCMT to GND
—
40
—
pF
Transmission line, Zo = 100 ohm differential
100
ohms
150
ohms
ON-chip
OFF-chip
3.3V
3.3V
24mA
~16 ohms
24mA
~16 ohms
+
85 ohms
+/-1%
85 ohms
+/-1%
Zback
-



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