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EP2C35A15F324C6N Datasheet(PDF) 89 Page - Altera Corporation |
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EP2C35A15F324C6N Datasheet(HTML) 89 Page - Altera Corporation |
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89 / 168 page  Altera Corporation 4–7 February 2007 Cyclone II Device Handbook, Volume 1 Hot Socketing & Power-On Reset If you cannot meet the maximum VCC ramp time requirement, you must use an external component to hold nCONFIG low until the power supplies have reached their minimum recommend operating levels. Otherwise, the device may not properly configure and enter user mode. Conclusion Cyclone II devices are hot socketable and support all power-up and power-down sequences with the one requirement that VCCIO and VCCINT be powered up and down within 100 ms of each other to keep the I/O pins from driving out. Cyclone II devices do not require any external devices for hot socketing and power sequencing. Document Revision History Table 4–1 shows the revision history for this document. Table 4–1. Document Revision History Date & Document Version Changes Made Summary of Changes February 2007 v3.1 ● Added document revision history. ● Updated “I/O Pins Remain Tri-Stated during Power-Up” section. ● Updated “Power-On Reset Circuitry” section. ● Added footnote to Figure 4–3. ● Specified VCCIO and VCCINT supplies must be GND when "not powered". ● Added clarification about input-tristate behavior. ● Added infomation on VCC monotonic ramp. July 2005 v2.0 Updated technical content throughout. February 2005 v1.1 Removed ESD section. June 2004 v1.0 Added document to the Cyclone II Device Handbook. |
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