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 R
PULL-DOWN
()
2
R
PULL-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 Range
4
100 µA 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
http://www.microsemi.com/soc/download/ibis/default.aspx.
2. R
(PULL-DOWN-MAX)
= (VOLspec) / IOLspec
3. R
(PULL-UP-MAX)
= (VCCImax – VOHspec) / IOHspec
4. All LVCMOS 3.3 V software macros support LVCMOS 3.3 V wide range as specified in the JESD-8B
specification.