Stratix 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 Stratix II devices before or during power-up or
power-down without damaging the device. Stratix II devices support any
power-up or power-down sequence (VCCIO, VCCINT, and VCCPD) in order
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, Stratix II device's output buffers are turned
off during system power-up or power-down. Stratix II device also does
not drive out until the device is configured and has attained proper
operating conditions.
Signal Pins Do Not Drive the VCCIO, VCCINT or VCCPD Power
Supplies
Devices that do not support hot-socketing can short power supplies
together when powered-up through the device signal pins. This irregular
power-up can damage both the driving and driven devices and can
disrupt card power-up.
Stratix II devices do not have a current path from I/O pins, dedicated
input pins, or dedicated clock pins to the VCCIO, VCCINT, or VCCPD pins
before or during power-up. A Stratix II device may be inserted into (or
removed from) a powered-up system board without damaging or
interfering with system-board operation. When hot-socketing, Stratix II
devices may have a minimal effect on the signal integrity of the
backplane.
1
You can power up or power down the VCCIO, VCCINT, and VCCPD
pins in any sequence. The power supply ramp rates can range
from 100 μs to 100 ms. All 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. Stratix 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.
4–2
Stratix II Device Handbook, Volume 1
Altera Corporation
May 2007
ALTERA [ ALTERA CORPORATION ]
