Chapter 1: Cyclone IV Device Datasheet
1–41
Glossary
Table 1–46. Glossary (Part 5 of 5)
Letter
Term
VCM(DC)
Definitions
DC common mode input voltage.
VDIF(AC)
VDIF(DC)
VICM
AC differential input voltage: The minimum AC input differential voltage required for switching.
DC differential input voltage: The minimum DC input differential voltage required for switching.
Input common mode voltage: The common mode of the differential signal at the receiver.
Input differential voltage swing: The difference in voltage between the positive and
complementary conductors of a differential transmission at the receiver.
VID
VIH
Voltage input high: The minimum positive voltage applied to the input that is accepted by the
device as a logic high.
VIH(AC)
VIH(DC)
High-level AC input voltage.
High-level DC input voltage.
Voltage input low: The maximum positive voltage applied to the input that is accepted by the
device as a logic low.
VIL
VIL (AC)
VIL (DC)
VIN
Low-level AC input voltage.
Low-level DC input voltage.
DC input voltage.
VOCM
Output common mode voltage: The common mode of the differential signal at the transmitter.
Output differential voltage swing: The difference in voltage between the positive and
complementary conductors of a differential transmission at the transmitter. VOD = VOH – VOL.
VOD
VOH
V
Voltage output high: The maximum positive voltage from an output that the device considers is
accepted as the minimum positive high level.
Voltage output low: The maximum positive voltage from an output that the device considers is
accepted as the maximum positive low level.
VOL
VOS
Output offset voltage: VOS = (VOH + VOL) / 2.
AC differential output cross point voltage: the voltage at which the differential output signals
must cross.
VOX (AC)
VREF
Reference voltage for the SSTL and HSTL I/O standards.
AC input reference voltage for the SSTL and HSTL I/O standards. VREF(AC) = VREF(DC) + noise. The
VREF (AC)
VREF (DC)
VSWING (AC)
peak-to-peak AC noise on VREF must not exceed 2% of VREF(DC)
.
DC input reference voltage for the SSTL and HSTL I/O standards.
AC differential input voltage: AC input differential voltage required for switching. For the SSTL
differential I/O standard, refer to Input Waveforms.
DC differential input voltage: DC input differential voltage required for switching. For the SSTL
differential I/O standard, refer to Input Waveforms.
VSWING (DC)
VTT
Termination voltage for the SSTL and HSTL I/O standards.
AC differential input cross point voltage: The voltage at which the differential input signals must
cross.
VX (AC)
W
X
Y
Z
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March 2016 Altera Corporation
Cyclone IV Device Handbook,
Volume 3
INTEL [ INTEL ]
