EP2C20F256C6N Altera, EP2C20F256C6N Datasheet - Page 85

• Manufacturer Part Number: EP2C20F256C6N
• Description: IC CYCLONE II FPGA 20K 256-FBGA
• Manufacturer: Altera
• Series: Cyclone® IIr

Specifications of EP2C20F256C6N

• Number Of Logic Elements/cells: 18752
• Number Of Labs/clbs: 1172
• Total Ram Bits: 239616
• Number Of I /o: 152
• Voltage - Supply: 1.15 V ~ 1.25 V
• Mounting Type: Surface Mount
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 256-FBGA
• For Use With: P0528 - BOARD DEV DE1 ALTERA544-1736 - CYCLONE II STARTER KIT EP2C20N
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Gates: -
• Other names: 544-1660

Hot-Socketing
Feature
Implementation
in Cyclone II
Devices
Altera Corporation
February 2007
the power supply can provide current to the device’s V
planes. This condition can lead to latch-up and cause a low-impedance
path from V
a large amount of current, possibly causing electrical damage.
Altera has ensured by design of the I/O buffers and hot-socketing
circuitry, that Cyclone II devices are immune to latch-up during hot
socketing.
The hot-socketing feature turns off the output buffer during power up
(either V
generates an internal HOTSCKT signal when either V
below the threshold voltage. Designs cannot use the HOTSCKT signal for
other purposes. The HOTSCKT signal cuts off the output buffer to ensure
that no DC current (except for weak pull-up leakage current) leaks
through the pin. When V
even after the internal POR signal (not available to the FPGA fabric used
by customer designs) is released and the configuration is finished. The
CONF_DONE, nCEO, and nSTATUS pins fail to respond, as the output
buffer cannot drive out because the hot-socketing circuitry keeps the I/O
pins tristated at this low V
has been removed on these configuration output or bidirectional pins to
ensure that they are able to operate during configuration. These pins are
expected to drive out during power-up and power-down sequences.
Each I/O pin has the circuitry shown in
CCINT
CC
or V
to ground within the device. As a result, the device extends
CCIO
supplies) or power down. The hot-socket circuit
CC
CC
ramps up slowly, V
voltage. Therefore, the hot-socketing circuit
Cyclone II Device Handbook, Volume 1
Figure
Hot Socketing & Power-On Reset
CC
4–1.
is still relatively low
CCINT
CC
and ground
or V
CCIO
is
4–3