LFECP40 Lattice Semiconductor, LFECP40 Datasheet - Page 45
LFECP40
Manufacturer Part Number
LFECP40
Description
(LFEC Series) LatticeECP/EC Family Data Sheet
Manufacturer
Lattice Semiconductor
Datasheet
1.LFECP40.pdf
(117 pages)
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Lattice Semiconductor
LVPECL
The LatticeECP/EC devices support differential LVPECL standard. This standard is emulated using complemen-
tary LVCMOS outputs in conjunction with a parallel resistor across the driver outputs. The scheme shown in
Figure 3-2 is one possible solution for point-to-point signals.
Figure 3-2. Differential LVPECL
Table 3-2. LVPECL DC Conditions
For further information on LVPECL, BLVDS and other differential interfaces please see details of additional techni-
cal information at the end of this data sheet.
Z
R
R
V
V
V
V
Z
I
1. For input buffer, see LVDS table.
DC
Parameter
OUT
OH
OL
OD
BACK
P
T
CM
3.3V
3.3V
Output impedance
Driver parallel resistor
Receiver termination
Output high voltage
Output low voltage
Output differential voltage
Output common mode voltage
Back impedance
DC output current
Over Recommended Operating Conditions
1
Off-chip
100 ohms
100 ohms
Description
~150 ohms
Transmission line, Zo = 100 ohm differential
3-9
DC and Switching Characteristics
Typical
LatticeECP/EC Family Data Sheet
85.7
2.03
1.27
0.76
1.65
12.7
100
150
100
100 ohms
Units
ohm
ohm
ohm
ohm
mA
V
V
V
V
+
-
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