A3P030 datasheet(41/220 Pages) MICROSEMI

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ProASIC3 Flash Family FPGAs

Revision 13

2-27

Table 2-30 • I/O Output Buffer Maximum Resistances1

Applicable to Standard 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

150

8 mA

150

3.3 V LVCMOS Wide Range4

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

100

8 mA

100

1.8 V LVCMOS

2 mA

200

225

4 mA

100

112

1.5 V LVCMOS

2 mA

200

224

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.

Table 2-31 • I/O Weak Pull-Up/Pull-Down Resistances

Minimum and Maximum Weak Pull-Up/Pull-Down Resistance Values

VCCI

R(WEAK PULL-UP)1

(

)

R(WEAK PULL-DOWN)2

(

)

Min.

Max.

Min.

Max.

3.3 V

10 k

45 k

10 k

45 k

3.3 V (wide range I/Os)

10 k

45 k

10 k

45 k

2.5 V

11 k

55 k

12 k

74 k

1.8 V

18 k

70 k

17 k

110 k

1.5 V

19 k

90 k

19 k

140 k

Notes:

1. R(WEAK PULL-UP-MAX) = (VCCIMAX – VOHspec) / I(WEAK PULL-UP-MIN)

2. R(WEAK PULL-DOWN-MAX) = (VOLspec) / I(WEAK PULL-DOWN-MIN)

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