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Lattice Semiconductor
ispXPGA Family Data Sheet
25
sysIO Differential Standards DC Electrical Characteristics
Parameter
LVDS
1
Description
Test Conditions
Min.
Typ.
Max.
V
INP,
V
INM
V
THD
V
CM
I
IN
V
OH
V
OL
V
OD
V
OD
V
OS
V
OS
I
OSD
Input voltage
0V
—
2.4V
Differential input threshold
+/-100mV
—
—
Input Common Mode voltage
Half the sum of the two inputs
0.05V
—
2.35V
Input current
Power on or Power off
—
—
+/-10uA
Output High Voltage for V
OP
or V
OM
Output Low Voltage for V
OP
or V
OM
Output Voltage Differential
RT = 100 Ohm
—
1.38V
1.60V
RT = 100 Ohm
0.9V
1.03V
—
|V
OP
- V
OM
|, R
T
= 100 ohm
250mV
350mV
450mV
Change in V
OD
between high and low
Output Voltage Offset
—
—
50mV
|V
OP
+ V
OM
|/2, R
T
= 100 ohm
1.125V
1.25V
1.375V
Change in V
OS
between H and L
Output short circuit current
—
—
50mV
V
OD
= 0V Driver outputs
shorted
—
—
24mA
BLVDS
1
V
INP,
V
INM
V
THD
V
CM
I
IN
V
OH
V
OL
V
OD
V
OD
V
OS
V
OS
I
OSD
Input voltage
0V
—
2.4V
Differential input threshold
+/-100mV
—
—
Input Common Mode voltage
Half the sum of the two inputs
0.05V
—
2.35V
Input current
Power on or Power off
—
—
+/-10uA
Output High Voltage for V
OP
or V
OM
Output Low Voltage for V
OP
or V
OM
Output Voltage Differential
R
T
= 27
R
T
= 27
|V
OP
- V
OM
|, RT = 27
—
1.4V
1.80V
0.95V
1.1V
—
240mV
300mV
460mV
Change in V
OD
Between H and L
Output Voltage Offset
27mV
|V
OP
+ V
OM
| /2, RT = 27
1.1V
1.3V
1.5V
Change in V
OS
Between H and L
Output Short Circuit Current
27mV
V
OD
= 0. Driver Outputs
Shorted.
36mA
65mA
1. V
OP
and V
OM
are the two outputs of the LVDS/BLVDS output buffer.
LVPECL
1
DC
Parameter
Parameter Description
Min.
Max.
Min.
Max.
Min.
Max.
Units
V
CCO
3.0
3.3
3.6
V
V
IH
V
IL
V
OH
V
OL
V
DIFF
1. These values are valid at the output of the source termination pack as shown above with 100-ohm differential load only (see Figure 22).
The V
OH
levels are 200mV below the standard LVPECL levels and are compatible with devices tolerant of the lower common mode ranges.
Input Voltage High
1.49
2.72
1.49
2.72
1.49
2.72
V
Input Voltage Low
0.86
2.125
0.86
2.125
0.86
2.125
V
Output Voltage High
1.8
2.11
1.92
2.28
2.13
2.41
V
Output Voltage Low
0.96
1.27
1.06
1.43
1.3
1.57
V
Differential Input voltage
0.3
—
0.3
—
0.3
—
V