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Altera Corporation
APEX 20K Programmable Logic Device Family Data Sheet
Figure 33. Relationship between VCCIO & VCCINT for 3.3-V PCI Compliance
Figure 34 shows the typical output drive characteristics of APEX 20K
devices with 3.3-V and 2.5-V VCCIO. The output driver is compatible with
the 3.3-V PCI Local Bus Specification, Revision 2.2 (when VCCIO pins are
connected to 3.3 V). 5-V tolerant APEX 20K devices in the -1 speed grade
are 5-V PCI compliant over all operating conditions.
Figure 34. Output Drive Characteristics of APEX 20K Device
(1)
These are transient (AC) currents.
3.0
3.1
3.3
VCCIO
3.6
2.3
2.5
2.7
VCCINT (V)
(V)
PCI-Compliant Region
VO Output Voltage (V)
IOL
IOH
V
VCCINT = 2.5
VCCIO = 2.5
Room Temperature
V
VCCINT = 2.5
VCCIO = 3.3
Room Temperature
12
3
10
20
30
50
60
40
70
80
90
VO Output Voltage (V)
12
3
10
20
30
50
60
40
70
80
90
IOL
O
Typical I
Output
Current (mA)
O
Typical I
Output
Current (mA)