EP3C16F256I7N Altera, EP3C16F256I7N Datasheet - Page 176

• Manufacturer Part Number: EP3C16F256I7N
• Description: Cyclone III
• Manufacturer: Altera

Cyclone III Device I/O Features
Figure 7–11. Cyclone III SSTL I/O Standard Termination
7–24
Cyclone III Device Handbook, Volume 1
Termination
OCT With
and Without
Calibration
External
On-Board
Termination
Cyclone III
Series OCT
50 Ω
Transmitter
Transmitter
Differential I/O Standard Termination
Differential I/O standards typically require a termination resistor
between the two signals at the receiver. The termination resistor must
match the differential load impedance of the bus (refer to
and 7–13).
Cyclone III devices support differential SSTL-2 and SSTL-18, differential
HSTL-18, HSTL-15, and HSTL-12, PPDS, LVDS, RSDS, mini-LVDS, and
differential LVPECL.
25 Ω
SSTL Class I
50 Ω
V REF
50 Ω
50 Ω
V REF
50 Ω
V TT
V TT
Receiver
Receiver
Cyclone III
Series OCT
25 Ω
Transmitter
Transmitter
25 Ω
SSTL Class II
50 Ω
50 Ω
Altera Corporation-Preliminary
V TT
V TT
50 Ω
50 Ω
50 Ω
V REF
V REF
50 Ω
V TT
V TT
Figures 7–12
Receiver
Receiver
March 2007