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EP2C35A5Q324I6N 数据表(PDF) 87 Page - Altera Corporation

部件名 EP2C35A5Q324I6N
功能描述  Cyclone II Device Family
Download  168 Pages
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制造商  ALTERA [Altera Corporation]
网页  http://www.altera.com
标志 ALTERA - Altera Corporation

EP2C35A5Q324I6N 数据表(HTML) 87 Page - Altera Corporation

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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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