Timing Specifications
Table 5–50. LVDS Transmitter Timing Specification (Part 2 of 2)
–6 Speed Grade
–7 Speed Grade
–8 Speed Grade
Symbol Conditions
Unit
Max Max
Max Max
Max Max
Min
Typ
Min
Typ
Min
Typ
(1)
(2)
(1)
(2)
(1)
(2)
80–20%
—
150
—
200
—
250
100
150
—
200
—
250
100
150
—
200
—
ps
tFALL
250 (11)
100 (12)
μs
tLOCK
Notes to Table 5–50:
(1) The maximum data rate that complies with duty cycle distortion of 45–55%.
(2) The maximum data rate when taking duty cycle in absolute ps into consideration that may not comply with 45–55%
duty cycle distortion. If the downstream receiver can handle duty cycle distortion beyond the 45–55% range, you
may use the higher data rate values from this column. You can calculate the duty cycle distortion as a percentage
using the absolute ps value. For example, for a data rate of 640 Mbps (UI = 1562.5 ps) and a tDU TY of 250 ps, the
duty cycle distortion is tDU TY/(UI*2) *100% = 250 ps/(1562.5 *2) * 100% = 8%, which gives you a duty cycle
distortion of 42–58%.
(3) The TCCS specification applies to the entire bank of LVDS, as long as the SERDES logic is placed within the LAB
adjacent to the output pins.
(4) For extended temperature devices, the maximum input clock frequency for ×10 through ×2 modes is 137.5 MHz.
(5) For extended temperature devices, the maximum data rate for ×10 through ×2 modes is 275 Mbps.
(6) For extended temperature devices, the maximum input clock frequency for ×10 through ×2 modes is 200 MHz.
(7) For extended temperature devices, the maximum data rate for ×10 through ×2 modes is 400 Mbps.
(8) For extended temperature devices, the maximum input clock frequency for ×1 mode is 340 MHz.
(9) For extended temperature devices, the maximum data rate for ×1 mode is 340 Mbps.
(10) For extended temperature devices, the maximum output jitter (peak to peak) is 600 ps.
(11) For extended temperature devices, the maximum tRIS E and tFALL are 300 ps.
(12) For extended temperature devices, the maximum lock time is 500 us.
5–62
Altera Corporation
February 2008
Cyclone II Device Handbook, Volume 1
ALTERA [ ALTERA CORPORATION ]
