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EP2C8AT324C8N Datasheet(PDF) 68 Page - Altera Corporation

Part # EP2C8AT324C8N
Description  Section I. Cyclone II Device Family Data Sheet
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Manufacturer  ALTERA [Altera Corporation]
Direct Link  http://www.altera.com
Logo ALTERA - Altera Corporation

EP2C8AT324C8N Datasheet(HTML) 68 Page - Altera Corporation

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Altera Corporation
Cyclone II Device Handbook, Volume 1
February 2007
I/O Structure & Features
Cyclone II devices support driver impedance matching to the impedance
of the transmission line, typically 25 or 50
Ω. When used with the output
drivers, on-chip termination sets the output driver impedance to 25 or
50
Ω. Cyclone II devices also support I/O driver series termination
(RS = 50 Ω) for SSTL-2 and SSTL-18. Table 2–19 lists the I/O standards that
support impedance matching and series termination.
1
The recommended frequency range of operation is pending
silicon characterization.
On-chip series termination can be supported on any I/O bank. VCCIO and
VREF must be compatible for all I/O pins in order to enable on-chip series
termination in a given I/O bank. I/O standards that support different RS
values can reside in the same I/O bank as long as their VCCIO and VREF are
not conflicting.
1
When using on-chip series termination, programmable drive
strength is not available.
Impedance matching is implemented using the capabilities of the output
driver and is subject to a certain degree of variation, depending on the
process, voltage and temperature. The actual tolerance is pending silicon
characterization.
Table 2–19. I/O Standards Supporting Series Termination
Note (1)
I/O Standards
Target RS (
Ω)VCCIO (V)
3.3-V LVTTL and LVCMOS
25 (2)
3.3
2.5-V LVTTL and LVCMOS
50 (2)
2.5
1.8-V LVTTL and LVCMOS
50 (2)
1.8
SSTL-2 class I
50 (2)
2.5
SSTL-18 class I
50 (2)
1.8
Notes to Table 2–19:
(1)
Supported conditions are VCCIO =VCCIO ±50 mV.
(2)
These RS values are nominal values. Actual impedance varies across process,
voltage, and temperature conditions.


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