Operating Conditions
Figure 5–2 shows the transmitter output waveforms for all supported
differential output standards (LVDS, mini-LVDS, RSDS, differential 1.5-V
HSTL class I and II, differential 1.8-V HSTL class I and II, differential
SSTL-2 class I and II, and differential SSTL-18 class I and II).
Figure 5–2. Transmitter Output Waveforms for Differential I/O Standards
Single-Ended Waveform
Positive Channel (p) = V
OH
V
(1)
OD
Negative Channel (n) = V
Ground
OL
V
(2)
OCM
Differential Waveform (Mathematical Function of Positive and Negative Channel)
V
(1)
OD
0 V
V
(1)
OD
p − n (3)
Notes to Figure 5–2:
(1) VOD is the output differential voltage. VOD = |p – n|.
(2) VOCM is the output common mode voltage. VOCM = (p + n)/2.
(3) The p – n waveform is a function of the positive channel (p) and the negative channel (n).
Table 5–9 shows the DC characteristics for user I/O pins with differential
I/O standards.
Table 5–9. DC Characteristics for User I/O Pins Using Differential I/O Standards Note (1) (Part 1 of 2)
VOD (mV)
ΔVOD (mV)
VOCM (V)
Typ
VOH (V)
VOL (V)
I/O Standard
Min Typ Max Min Max Min
Max
Min Max Min
Max
LVDS
250
300
100
—
—
—
—
—
600
600
600
—
—
—
—
—
50
50
—
—
1.125
1.125
1.125
—
1.25
1.25
1.25
—
1.375
1.375
1.375
—
—
—
—
—
—
—
—
—
—
—
—
—
—
mini-LVDS (2)
RSDS (2)
—
Differential 1.5-V
HSTL class I
and II (3)
VCCIO
– 0.4
0.4
5–10
Altera Corporation
February 2008
Cyclone II Device Handbook, Volume 1
ALTERA [ ALTERA CORPORATION ]
