Spartan-3 FPGA Family: DC and Switching Characteristics
R
V
INP
Internal
Logic
V
INN
P
N
Differential
I/O Pair Pins
V
INN
V
INP
GND level
50%
V
ICM
V
ID
V
ICM
= Input common mode voltage =
V
INP
+ V
INN
2
V
ID
= Differential input voltage = V
INP
- V
INN
DS099-3_01_012304
Figure 1:
Differential Input Voltages
Table 10:
Recommended Operating Conditions for User I/Os Using Differential Signal Standards
V
CCO(1)
Signal Standard
LDT_25
LVDS_25,
LVDS_25_DCI
BLVDS_25
LVDSEXT_25,
LVDSEXT_25_DCI
ULVDS_25
LVPECL_25
RSDS_25
Min
(V)
2.375
2.375
2.375
2.375
2.375
2.375
2.375
Nom
(V)
2.50
2.50
2.50
2.50
2.50
2.50
2.50
Max
(V)
2.625
2.625
2.625
2.625
2.625
2.625
2.625
Min
(mV)
200
100
-
100
200
100
100
V
ID
Nom
(mV)
600
350
350
540
600
-
200
Max
(mV)
1000
600
-
1000
1000
-
-
Min
(V)
0.44
0.30
-
0.30
0.44
-
-
V
ICM
Nom
(V)
0.60
1.25
1.25
1.20
0.60
-
1.20
Max
(V)
0.78
2.20
-
2.20
0.78
-
-
Min
(V)
-
-
-
-
-
0.8
-
V
IH
Max
(V)
-
-
-
-
-
2.0
-
Min
(V)
-
-
-
-
-
0.5
-
V
IL
Max
(V)
-
-
-
-
-
1.7
-
Notes:
1. V
CCO
only supplies differential output drivers, not input circuits.
2. V
REF
inputs are not used for any of the differential I/O standards.
3. V
ID
is a differential measurement.
8
1-800-255-7778
DS099-3 (v1.3) March 4, 2004
Advance Product Specification
XILINX [ XILINX, INC ]
