Chapter 1: Cyclone III Device Datasheet
1–31
Glossary
Table 1–39. 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 which 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 which 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 which the device considers is
accepted as the minimum positive high level.
Voltage Output Low: The maximum positive voltage from an output which 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 SSTL, HSTL I/O Standards.
AC input reference voltage for SSTL, HSTL I/O Standards. VREF(AC) = VREF(DC) + noise. The
VREF (AC)
VREF (DC)
VSWING (AC)
peak-to-peak AC noise on VREF should not exceed 2% of VREF(DC)
.
DC input reference voltage for SSTL, 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 SSTL, 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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July 2012 Altera Corporation
Cyclone III Device Handbook
Volume 2
INTEL [ INTEL ]
