Specifications

External Termination SchemeI/O Standard
Differential HSTL I/O Standard Termination
Differential 1.8 V HSTL Class I
Differential 1.8 V HSTL Class II
Differential 1.5 V HSTL Class I
Differential 1.5 V HSTL Class II
Differential 1.2 V HSTL Class I
Differential 1.2 V HSTL Class II
LVDS I/O Standard TerminationLVDS
RSDS/mini-LVDS I/O Standard Termination
RSDS
Mini-LVDS
Differential LVPECL I/O Standard TerminationLVPECL
SLVS I/O Standard TerminationSLVS
No external termination required
SSTL-15
(13)
SSTL-135
(13)
SSTL-125
(13)
HSUL-12
Differential SSTL-15
(13)
Differential SSTL-135
(13)
Differential SSTL-125
(13)
Differential HSUL-12
Single-ended I/O Termination
Voltage-referenced I/O standards require an input V
REF
and a termination voltage (V
TT
). The reference
voltage of the receiving device tracks the termination voltage of the transmitting device.
The supported I/O standards such as SSTL-125, SSTL-135, and SSTL-15 typically do not require external
board termination.
Altera recommends that you use dynamic OCT with these I/O standards to save board space and cost.
Dynamic OCT reduces the number of external termination resistors used.
You cannot use R
S
and R
T
OCT simultaneously. For more information, refer to the related
information.
Note:
(13)
Altera recommends that you use dynamic OCT with these I/O standards to save board space and cost. Dynamic
OCT reduces the number of external termination resistors used.
I/O Features in Cyclone V Devices
Altera Corporation
Send Feedback
CV-52005
Single-ended I/O Termination
5-44
2013.06.21