epm2210gm100i Altera Corporation, epm2210gm100i Datasheet - Page 46
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epm2210gm100i
Manufacturer Part Number
epm2210gm100i
Description
Section I. Max Ii Device Family Data Sheet
Manufacturer
Altera Corporation
Datasheet
1.EPM2210GM100I.pdf
(108 pages)
- Current page: 46 of 108
- Download datasheet (2Mb)
I/O Structure
2–38Core Version a.b.c variable
MAX II Device Handbook, Volume 1
Slew-Rate Control
The output buffer for each MAX II device I/O pin has a programmable
output slew-rate control that can be configured for low noise or
high-speed performance. A faster slew rate provides high-speed
transitions for high-performance systems. However, these fast transitions
may introduce noise transients into the system. A slow slew rate reduces
system noise, but adds a nominal output delay to rising and falling edges.
The lower the voltage standard (for example, 1.8-V LVTTL) the larger the
output delay when slow slew is enabled. Each I/O pin has an individual
slew-rate control, allowing the designer to specify the slew rate on a
pin-by-pin basis. The slew-rate control affects both the rising and falling
edges.
Open-Drain Output
MAX II devices provide an optional open-drain (equivalent to
open-collector) output for each I/O pin. This open-drain output enables
the device to provide system-level control signals (for example, interrupt
and write enable signals) that can be asserted by any of several devices.
This output can also provide an additional wired-OR plane.
Programmable Ground Pins
Each unused I/O pin on MAX II devices can be used as an additional
ground pin. This programmable ground feature does not require the use
of the associated LEs in the device. In the Quartus II software, unused
pins can be set as programmable GND on a global default basis or they
can be individually assigned. Unused pins also have the option of being
set as tri-stated input pins.
Note to
(1)
1.5-V LVCMOS
Table 2–6. Programmable Drive Strength
The I
minimum, where the V
current strength numbers shown are for a condition of a V
where the V
LVTTL/LVCMOS, the I
V
I/O Standard
OUT
Table
OH
= 0.7 V.
current strength numbers shown are for a condition of a V
2–6:
OL
maximum is specified by the I/O standard. For 2.5-V
OH
OH
minimum is specified by the I/O standard. The I
condition is V
I
OH
/I
OL
Current Strength Setting (mA)
OUT
Note (1)
= 1.7 V and the I
4
2
(Part 2 of 2)
OUT
Altera Corporation
OL
= V
condition is
OL
OUT
March 2008
maximum,
= V
OH
OL
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