LCMXO2280 Lattice Semiconductor, LCMXO2280 Datasheet - Page 34

• Manufacturer Part Number: LCMXO2280
• Description: (LCMXOxxx) MachXO Family
• Manufacturer: Lattice Semiconductor

Lattice Semiconductor
sysIO Differential Electrical Characteristics
LVDS
LVDS Emulation
MachXO devices can support LVDS outputs via emulation (LVDS25E), in addition to the LVDS support that is avail-
able on-chip on certain devices. The output is emulated using complementary LVCMOS outputs in conjunction with
resistors across the driver outputs on all devices. The scheme shown in Figure 3-1 is one possible solution for
LVDS standard implementation. Resistor values in Figure 3-1 are industry standard values for 1% resistors.
Figure 3-1. LVDS Using External Resistors (LVDS25E)
The LVDS differential input buffers are available on certain devices in the MachXO family.
V
V
V
I
V
V
V
ΔV
V
ΔV
I
IN
OSD
Parameter
INP,
THD
CM
OH
OL
OD
OS
Symbol
OD
OS
V
INM
Input Voltage
Differential Input Threshold
Input Common Mode Voltage
Input current
Output high voltage for V
Output low voltage for V
Output voltage differential
Change in V
low
Output voltage offset
Change in V
Output short circuit current
Parameter Description
8mA
8mA
Note: All resistors are ±1%.
OD
OS
VCCIO = 2.5
VCCIO = 2.5
between H and L
between high and
Emulated
On-chip
Buffer
LVDS
Over Recommended Operating Conditions
OP
OP
or V
or V
OM
OM
Off-chip
158
158
100mV ≤ V
200mV ≤ V
350mV ≤ V
Power on
R
R
(V
(V
V
shorted
OD
T
T
OP
OP
= 100 Ohm
= 100 Ohm
= 0V Driver outputs
- V
- V
Test Conditions
140
OM
OM
3-8
THD
THD
THD
), R
)/2, R
T
= 100 Ohm
T
Zo = 100
= 100 Ohm
DC and Switching Characteristics
V
V
V
+/-100
Off-chip
1.125
0.9V
Min.
THD
THD
THD
250
—
—
—
—
—
MachXO Family Data Sheet
0
100
/2
/2
/2
Typ.
1.38
1.03
1.25
350
1.2
1.2
1.2
—
—
—
—
—
—
On-chip
+
-
www.DataSheet4U.com
1.375
+/-10
Max.
1.60
450
2.4
1.8
1.9
2.0
50
50
—
—
6
Units
mV
mV
mV
mV
mA
µA
V
V
V
V
V
V
V