EP4CGX75DF27C7N Altera, EP4CGX75DF27C7N Datasheet - Page 111

• Manufacturer Part Number: EP4CGX75DF27C7N
• Description: Cyclone IV GX
• Manufacturer: Altera
• Series: CYCLONE® IV GXr

Specifications of EP4CGX75DF27C7N

• Number Of Logic Elements/cells: 73920
• Number Of Labs/clbs: 4620
• Total Ram Bits: 4257792
• Number Of I /o: 310
• Number Of Gates: -
• Voltage - Supply: 1.16 V ~ 1.24 V
• Mounting Type: *
• Operating Temperature: 0°C ~ 85°C
• Package / Case: *
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Chapter 6: I/O Features in Cyclone IV Devices
I/O Element Features
I/O Element Features
Programmable Current Strength
Slew Rate Control
Open-Drain Output
© December 2010 Altera Corporation
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The Cyclone IV IOE offers a range of programmable features for an I/O pin. These
features increase the flexibility of I/O utilization and provide a way to reduce the
usage of external discrete components, such as pull-up resistors and diodes.
The output buffer for each Cyclone IV I/O pin has a programmable current strength
control for certain I/O standards.
The LVTTL, LVCMOS, SSTL-2 Class I and II, SSTL-18 Class I and II, HSTL-18 Class I
and II, HSTL-15 Class I and II, and HSTL-12 Class I and II I/O standards have several
levels of current strength that you can control.
Table 6–2 on page 6–7
strength control. These programmable current strength settings are a valuable tool in
helping decrease the effects of simultaneously switching outputs (SSO) in conjunction
with reducing system noise. The supported settings ensure that the device driver
meets the specifications for IOH and IOL of the corresponding I/O standard.
When you use programmable current strength, on-chip series termination (R
not available.
The output buffer for each Cyclone IV I/O pin provides optional programmable
output slew-rate control.
and the Quartus II default slew rate setting. However, these fast transitions may
introduce noise transients in the system. A slower slew rate reduces system noise, but
adds a nominal delay to rising and falling edges. Because each I/O pin has an
individual slew-rate control, you can specify the slew rate on a pin-by-pin basis. The
slew-rate control affects both the rising and falling edges. Slew rate control is available
for single-ended I/O standards with current strength of 8 mA or higher.
You cannot use the programmable slew rate feature when using OCT with calibration.
You cannot use the programmable slew rate feature when using the 3.0-V PCI,
3.0-V PCI-X, 3.3-V LVTTL, or 3.3-V LVCMOS I/O standards. Only the fast slew rate
(default) setting is available.
Cyclone IV devices provide an optional open-drain (equivalent to an 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 are
asserted by multiple devices in your system.
shows the possible settings for I/O standards with current
Table 6–2 on page 6–7
shows the possible slew rate option
Cyclone IV Device Handbook, Volume 1
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OCT) is
6–3