2-26 Revision 13 Table 2-29 I/O Output Buffer Maximum Resistances
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ProASIC3 DC and Switching Characteristics
2-26
Revision 13
Table 2-29 I/O Output Buffer Maximum Resistances 1
Applicable to Standard Plus I/O Banks
Standard
Drive Strength
RPULL-DOWN ()2
RPULL-UP ()3
3.3 V LVTTL / 3.3 V LVCMOS
2 mA
100
300
4 mA
100
300
6 mA
50
150
8 mA
50
150
12 mA
25
75
16 mA
25
75
3.3 V LVCMOS Wide Range4
100 A
Same as regular
3.3 V LVCMOS
Same as regular
3.3 V LVCMOS
2.5 V LVCMOS
2 mA
100
200
4 mA
100
200
6 mA
50
100
8 mA
50
100
12 mA
25
50
1.8 V LVCMOS
2 mA
200
225
4 mA
100
112
6 mA
50
56
8 mA
50
56
1.5 V LVCMOS
2 mA
200
224
4 mA
100
112
3.3 V PCI/PCI-X
Per PCI/PCI-X
specification
25
75
Notes:
1. These maximum values are provided for informational reasons only. Minimum output buffer resistance
values depend on VCCI, drive strength selection, temperature, and process. For board design
considerations and detailed output buffer resistances, use the corresponding IBIS models located at
2. R(PULL-DOWN-MAX) = (VOLspec) / IOLspec
3. R(PULL-UP-MAX) = (VCCImax 鈥� VOHspec) / IOHspec
4. All LVCMOS 3.3 V software macros support LVCMOS 3.3 V wide range as specified in the JESD-8B
specification.
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