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EP2C35A15F324C6N Datasheet(PDF) 87 Page - Altera Corporation |
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EP2C35A15F324C6N Datasheet(HTML) 87 Page - Altera Corporation |
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87 / 168 page  Altera Corporation 4–5 February 2007 Cyclone II Device Handbook, Volume 1 Hot Socketing & Power-On Reset Figure 4–2. Transistor Level Diagram of FPGA Device I/O Buffers Notes to Figure 4–2: (1) This is the logic array signal or the larger of either the VCCIO or VPAD signal. (2) This is the larger of either the VCCIO or VPAD signal. Power-On Reset Circuitry Cyclone II devices contain POR circuitry to keep the device in a reset state until the power supply voltage levels have stabilized during power-up. The POR circuit monitors the VCCINT voltage levels and tri-states all user I/O pins until the VCC reaches the recommended operating levels. In addition, the POR circuitry also monitors the VCCIO level of the two I/O banks that contains configuration pins (I/O banks 1 and 3 for EP2C5 and EP2C8, I/O banks 2 and 6 for EP2C15A, EP2C20, EP2C35, EP2C50, and EP2C70) and tri-states all user I/O pins until the VCC reaches the recommended operating levels. After the Cyclone II device enters user mode, the POR circuit continues to monitor the VCCINT voltage level so that a brown-out condition during user mode can be detected. If the VCCINT voltage sags below the POR trip point during user mode, the POR circuit resets the device. If the VCCIO voltage sags during user mode, the POR circuit does not reset the device. "Wake-up" Time for Cyclone II Devices In some applications, it may be necessary for a device to wake up very quickly in order to begin operation. The Cyclone II device family offers the Fast-On feature to support fast wake-up time applications. Devices that support the Fast-On feature are designated with an “A” in the ordering code and have stricter power up requirements compared to non- A devices. Logic Array Signal (1) (2) VCCIO VPAD n+ n+ n-well n+ p+ p+ p-well p-substrate |
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