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EP2C8AT324C8N Datasheet(PDF) 84 Page - Altera Corporation |
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EP2C8AT324C8N Datasheet(HTML) 84 Page - Altera Corporation |
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84 / 168 page  4–2 Altera Corporation Cyclone II Device Handbook, Volume 1 February 2007 Cyclone II Hot-Socketing Specifications Devices Can Be Driven before Power-Up You can drive signals into the I/O pins, dedicated input pins, and dedicated clock pins of Cyclone II devices before or during power-up or power-down without damaging the device. Cyclone II devices support any power-up or power-down sequence (VCCIO and VCCINT) to simplify system level design. I/O Pins Remain Tri-Stated during Power-Up A device that does not support hot socketing may interrupt system operation or cause contention by driving out before or during power-up. In a hot-socketing situation, the Cyclone II device’s output buffers are turned off during system power-up or power-down. The Cyclone II device also does not drive out until the device is configured and has attained proper operating conditions. The I/O pins are tri-stated until the device enters user mode with a weak pull-up resistor (R) to 3.3V. Refer to Figure 4–1 for more information. 1 You can power up or power down the VCCIO and VCCINT pins in any sequence. The VCCIO and VCCINT must have monotonic rise to their steady state levels. (Refer to Figure 4–3 for more information.) The power supply ramp rates can range from 100 µs to 100 ms for non “A” devices. Both VCC supplies must power down within 100 ms of each other to prevent I/O pins from driving out. During hot socketing, the I/O pin capacitance is less than 15 pF and the clock pin capacitance is less than 20 pF. Cyclone II devices meet the following hot-socketing specification. ■ The hot-socketing DC specification is | IIOPIN | < 300 µA. ■ The hot-socketing AC specification is | IIOPIN | < 8 mA for 10 ns or less. This specification takes into account the pin capacitance but not board trace and external loading capacitance. You must consider additional capacitance for trace, connector, and loading separately. IIOPIN is the current at any user I/O pin on the device. The DC specification applies when all VCC supplies to the device are stable in the powered-up or powered-down conditions. For the AC specification, the peak current duration due to power-up transients is 10 ns or less. A possible concern for semiconductor devices in general regarding hot socketing is the potential for latch-up. Latch-up can occur when electrical subsystems are hot socketed into an active system. During hot socketing, the signal pins may be connected and driven by the active system before |
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