a2f500m3b-1csh484 Actel Corporation, a2f500m3b-1csh484 Datasheet - Page 41

• Manufacturer Part Number: a2f500m3b-1csh484
• Description: Actel
• Manufacturer: Actel Corporation

Table 2-27 • I/O Output Buffer Maximum Resistances
Table 2-28 • I/O Weak Pull-Up/Pull-Down Resistances
Standard
3.3 V LVTTL / 3.3 V LVCMOS
2.5 V LVCMOS
1.8 V LVCMOS
1.5 V LVCMOS
Notes:
1. These maximum values are provided for informational reasons only. Minimum output buffer resistance
2. R
3. R
VCCxxxxIOBx
3.3 V
2.5 V
1.8 V
1.5 V
Notes:
1. R
2. R
values depend on VCCxxxxIOBx, drive strength selection, temperature, and process. For board design
considerations and detailed output buffer resistances, use the corresponding IBIS models located on the
Actel website at http://www.actel.com/download/ibis/default.aspx.
(PULL-DOWN-MAX)
(PULL-UP-MAX)
(WEAK PULL-DOWN-MAX)
(WEAK PULL-UP-MAX)
Applicable to MSS I/O Banks
Minimum and Maximum Weak Pull-Up/Pull-Down Resistance Values
= (V
= (V
CCImax
= (V
OLspec
= (V
CCImax
Min.
10 k
18 k
19 k
11 k
– V
OLspec
) / I
R
OHspec
(WEAK PULL-UP)
OLspec
– V
) / I
OHspec
) / I
(Ω)
(WEAK PULL-DOWN-MIN)
OHspe c
R e v i s i o n 3
) / I
(WEAK PULL-UP-MIN)
Drive Strength
1
Max.
45 k
55 k
70 k
90 k
8 mA
4 mA
2 mA
8mA
1
Actel SmartFusion Intelligent Mixed Signal FPGAs
Min.
10 k
12 k
17 k
19 k
R
R
PULL-DOWN
(WEAK PULL-DOWN)
(Ω)
100
200
50
50
2
(Ω)
R
110 k
140 k
Max.
45 k
74 k
PULL-UP
2
(Ω)
150
100
224
112
3
2- 29