LFSC3GA25E-6FCN1704C View Datasheet(PDF) - Lattice Semiconductor
Part Name
Description
Manufacturer
LFSC3GA25E-6FCN1704C Datasheet PDF : 237 Pages
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Lattice Semiconductor
DC and Switching Characteristics
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
24mA
~16 ohms
3.3V
85 ohms
+/-1%
3.3V
+
85 ohms
150
ohms
Zback
100
ohms
-
+/-1%
24mA
~16 ohms
Transmission line, Zo = 100 ohm differential
ON-chip
OFF-chip
Table 3-3. LVPECL DC Conditions1
Over Recommended Operating Conditions
Symbol
Description
ZOUT
Output impedance
RS
Driver series resistor
RP
Driver parallel resistor
RT
Receiver termination
VOH
Output high voltage
VOL
Output low voltage
VOD
Output differential voltage
VCM
Output common mode voltage
ZBACK
Back impedance
IDC
DC output current
1. For input buffer, see LVDS table.
Nominal
16
85
150
100
2.03
1.27
0.76
1.65
86
12.6
Units
ohm
ohm
ohm
ohm
V
V
V
V
ohm
mA
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
CCMT
Capacitance VCMT to GND
Min.
—
Typ.
40
Max. Units
—
pF
3-10
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