LFEC10E-3F256C Lattice Semiconductor Corp., LFEC10E-3F256C Datasheet - Page 49

• Manufacturer Part Number: LFEC10E-3F256C
• Description: Latticeecp/ec Family of Fpga Devices Has Been Optimized to Deliver Mainstream Fpga Features at Low Cost.for Maximum Performance And Value, The Latticeecp (EConomy Plus) Fpga Concept Combines an Efficient Fpgafabric With High-speed Dedicated Functions
• Manufacturer: Lattice Semiconductor Corp.

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
3-7
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
+
-