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XC3S50A-4FTG256C Datasheet, PDF (19/132 Pages) Xilinx, Inc – Architectural and Configuration Overview | |||
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DC and Switching Characteristics
Differential Output Pairs
Internal
Logic
VOUTP
P
N
VOUTN
Differential
I/O Pair Pins
VOUTN
VOUTP
GND level
50%
VOCM
VOH
VOD
VOL
VOUTP + VOUTN
VOCM = Output common mode voltage =
2
VOD = Output differential voltage = VOUTP - VOUTN
VOH = Output voltage indicating a High logic level
VOL
=
Output
voltage
indicating
a
Low
logic
level
DS529-3_11_012907
Figure 5: Differential Output Voltages
Table 14: DC Characteristics of User I/Os Using Differential Signal Standards
IOSTANDARD Attribute Min (mV)
VOD
Typ
(mV)
Max (mV)
Min (V)
VOCM
Typ (V)
Max (V)
VOH
Min (V)
VOL
Max (V)
LVDS_25
247
350
454
1.125
â
1.375
â
â
LVDS_33
247
350
454
1.125
â
1.375
â
â
BLVDS_25
240
350
460
â
1.30
â
â
â
MINI_LVDS_25
MINI_LVDS_33
300
â
600
1.0
â
1.4
â
â
300
â
600
1.0
â
1.4
â
â
RSDS_25
100
â
400
1.0
â
1.4
â
â
RSDS_33
100
â
400
1.0
â
1.4
â
â
TMDS_33
PPDS_25
400
â
800
VCCO â 0.405
â
VCCO â 0.190
â
â
100
â
400
0.5
0.8
1.4
â
â
PPDS_33
100
â
400
0.5
0.8
1.4
â
â
DIFF_HSTL_I_18
DIFF_HSTL_II_18
DIFF_HSTL_III_18
DIFF_HSTL_I
DIFF_HSTL_III
DIFF_SSTL18_I
DIFF_SSTL18_II
DIFF_SSTL2_I
DIFF_SSTL2_II
DIFF_SSTL3_I
DIFF_SSTL3_II
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
VCCO â 0.4
0.4
â
â
â
VCCO â 0.4
0.4
â
â
â
VCCO â 0.4
0.4
â
â
â
VCCO â 0.4
0.4
â
â
â
VCCO â 0.4
0.4
â
â
â
VTT + 0.475 VTT â 0.475
â
â
â
VTT + 0.603 VTT â 0.603
â
â
â
VTT + 0.61 VTT â 0.61
â
â
â
VTT + 0.81 VTT â 0.81
â
â
â
VTT + 0.6
VTT â 0.6
â
â
â
VTT + 0.8
VTT â 0.8
Notes:
1. The numbers in this table are based on the conditions set forth in Table 8 and Table 13.
2. See "External Termination Requirements for Differential I/O," page 20.
3. Output voltage measurements for all differential standards are made with a termination resistor (RT) of 100Ω across the N and P pins of the
differential signal pair.
4. At any given time, no more than two of the following differential output standards can be assigned to an I/O bank: LVDS_25, RSDS_25,
MINI_LVDS_25, PPDS_25 when VCCO=2.5V, or LVDS_33, RSDS_33, MINI_LVDS_33, TMDS_33, PPDS_33 when VCCO = 3.3V
DS529-3 (v2.0) August 19, 2010
www.xilinx.com
19
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