XC3S50A Xilinx Corp., XC3S50A Datasheet - Page 34

• Manufacturer Part Number: XC3S50A
• Description: Spartan-3a Fpga Family Data Sheet
• Manufacturer: Xilinx Corp.

DC and Switching Characteristics
Table 26: Test Methods for Timing Measurement at I/Os (Continued)
34
Notes:
1.
2.
3.
SSTL3_I
SSTL3_II
Differential
LVDS_25
LVDS_33
BLVDS_25
MINI_LVDS_25
MINI_LVDS_33
LVPECL_25
LVPECL_33
RSDS_25
RSDS_33
TMDS_33
PPDS_25
PPDS_33
DIFF_HSTL_I
DIFF_HSTL_III
DIFF_HSTL_I_18
DIFF_HSTL_II_18
DIFF_HSTL_III_18
DIFF_SSTL18_I
DIFF_SSTL18_II
DIFF_SSTL2_I
DIFF_SSTL2_II
DIFF_SSTL3_I
DIFF_SSTL3_II
Descriptions of the relevant symbols are as follows:
V
V
V
V
V
R
V
The load capacitance (C
According to the PCI specification.
REF
ICM
M
L
H
T
Signal Standard
T
(IOSTANDARD)
– Low-level test voltage at Input pin
– Effective termination resistance, which takes on a value of 1 MΩ when no parallel termination is required
– Termination voltage
– High-level test voltage at Input pin
– Voltage of measurement point on signal transition
– The common mode input voltage
– The reference voltage for setting the input switching threshold
L
) at the Output pin is 0 pF for all signal standards.
V
REF
0.75
1.25
1.25
1.5
1.5
0.9
0.9
0.9
1.1
0.9
0.9
1.5
1.5
-
-
-
-
-
-
-
-
-
-
-
-
(V)
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
ICM
ICM
ICM
ICM
ICM
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
ICM
ICM
ICM
ICM
ICM
ICM
ICM
V
Inputs
L
– 0.125
– 0.125
– 0.125
– 0.125
– 0.125
– 0.75
– 0.75
(V)
– 0.3
– 0.3
– 0.1
– 0.1
– 0.1
– 0.1
– 0.1
– 0.5
– 0.5
– 0.5
– 0.5
– 0.5
– 0.5
– 0.5
– 0.5
– 0.5
– 0.5
– 0.5
www.xilinx.com
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
ICM
ICM
ICM
ICM
ICM
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
ICM
ICM
ICM
ICM
ICM
ICM
ICM
V
H
+ 0.125
+ 0.125
+ 0.125
+ 0.125
+ 0.125
+ 0.75
+ 0.75
(V)
+ 0.3
+ 0.3
+ 0.1
+ 0.1
+ 0.1
+ 0.1
+ 0.1
+ 0.5
+ 0.5
+ 0.5
+ 0.5
+ 0.5
+ 0.5
+ 0.5
+ 0.5
+ 0.5
+ 0.5
+ 0.5
R
N/A
N/A
1M
T
50
25
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
(Ω)
Outputs
V
0.75
1.25
1.25
DS529-3 (v1.5) July 10, 2007
N/A
N/A
T
1.5
1.5
1.2
1.2
1.2
1.2
1.2
1.2
3.3
0.8
0.8
1.5
0.9
0.9
1.8
0.9
0.9
1.5
1.5
0
(V)
Product Specification
Inputs and
Outputs
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
M
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
ICM
ICM
ICM
ICM
ICM
ICM
ICM
ICM
ICM
ICM
ICM
ICM
(V)
R