Altera® MAX® II CPLDs offer I/O capabilities that optimize ease-of-use and system integration. Table 1 lists the I/O standards supported in MAX II CPLDs. Table 2 lists MAX II I/O features and benefits.
Table 1. MAX II CPLD I/O Standards
|
I/O Standard |
Performance |
|
3.3-V LVTTL/LVCMOS |
300 MHz |
|
2.5-V LVTTL/LVCMOS |
220 MHz |
|
1.8-V LVTTL/LVCMOS |
200 MHz |
|
1.5-V LVCMOS |
150 MHz |
|
3.3-V PCI (1) |
66 MHz |
Table 2. MAX II CPLD I/O Features and Benefits
|
Feature |
Benefit |
|
3.3-, 2.5-, 1.8- & 1.5-V LVTTL/LVCMOS |
Enables broad application support and compatibility with other devices on board |
|
MultiVolt™ I/O With Multiple I/O Banks |
Up to four I/O banks seamlessly interface to other devices at 3.3-, 2.5-, 1.8-, and 1.5-V voltage levels |
|
PCI Support (1) |
Enables support for the 32-bit, 66-MHz PCI standard |
|
Schmitt Triggers |
Aids in noise tolerance on inputs with up to 300 mV of hysteresis on 3.3-V inputs and 160 mV of hysteresis on 2.5-V inputs |
|
Programmable Drive Strength and Slew Rate |
Allows you to control and improve signal integrity |
|
Single Output Enable (OE) per I/O Pin |
Numerous OEs allow you to use smaller devices, reducing cost |
|
Hot-Socketing Support |
Enables safe insertion or removal of device from powered systems |
|
Fast I/O Connection |
Enables fast tPD and tCO timing |
- PCI support is available on EPM1270 and EPM2210 devices.
Fast I/O Connection
The MAX II CPLD I/O element (IOE) includes a dedicated connection path from an adjacent logic element (LE) associated with the I/O pin that results in fast tPD and tCO performance parameters. Quartus® II software automatically selects the dedicated path to speed-up I/O performance. Figure 1 illustrates the IOE in MAX II CPLDs.
Figure 1. MAX II CPLD I/O Element
MAX II CPLD I/O Banks
There are two I/O banks in the EPM240 and EPM570 devices and four I/O banks in the EPM1270 and EPM2210 devices. Each I/O bank has its own VCCIO pin and can be configured independently to support 1.5-, 1.8-, 2.5-, and 3.3-V interfaces. Each I/O bank can support an independent I/O standard. Figure 2 shows the I/O bank configuration in MAX II CPLDs.
Figure 2. MAX II CPLD I/O Bank Configuration
