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EP2C8 Datasheet(PDF) 62 Page - Altera Corporation |
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EP2C8 Datasheet(HTML) 62 Page - Altera Corporation |
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62 / 168 page  2–50 Altera Corporation Cyclone II Device Handbook, Volume 1 February 2007 I/O Structure & Features Open-Drain Output Cyclone II devices provide an optional open-drain (equivalent to an open-collector) output for each I/O pin. This open-drain output enables the device to provide system-level control signals (that is, interrupt and write-enable signals) that can be asserted by any of several devices. LVCMOS (1.5 V) 2 2 44 66 8 SSTL-2 class I 8 8 12 12 SSTL-2 class II 16 16 20 24 SSTL-18 class I 6 6 88 10 10 12 SSTL-18 class II 16 18 HSTL-18 class I 8 8 10 10 12 12 HSTL-18 class II 16 18 20 HSTL-15 class I 8 8 10 12 HSTL-15 class II 16 Note to Table 2–16: (1) The default current in the Quartus II software is the maximum setting for each I/O standard. Table 2–16. Programmable Drive Strength (Part 2 of 2) Note (1) I/O Standard IOH/IOL Current Strength Setting (mA) Top & Bottom I/O Pins Side I/O Pins |
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