EP3C10U256C6N Datasheet, PDF (101/274 Pages) Altera Corporation – Cyclone III Device Family Overview

Chapter 6: I/O Features in the Cyclone III Device Family
6–3
I/O Element Features
Table 6–1 lists the possible settings for I/O standards with current strength control.
These programmable current strength settings are a valuable tool in helping decrease
the effects of simultaneously switching outputs (SSO) in conjunction with reducing
system noise. The supported settings ensure that the device driver meets the
specifications for IOH and IOL of the corresponding I/O standard.
1 When you use programmable current strength, on-chip series termination is not
available.
Table 6–1. Programmable Current Strength ⁽¹⁾
I/O Standard
I_OH/I_OL Current Strength Setting (mA)
Top and Bottom I/O Pins
Left and Right I/O Pins
1.2-V LVCMOS
2, 4, 6, 8, 10,12
2, 4, 6, 8,10
1.5-V LVCMOS
2, 4, 6, 8, 10, 12,16
2, 4, 6, 8, 10, 12,16
1.8-V LVTTL/LVCMOS
2, 4, 6, 8, 10, 12,16
2, 4, 6, 8, 10, 12,16
2.5-V LVTTL/LVCMOS
4, 8, 12,16
4, 8, 12,16
3.0-V LVCMOS
4, 8, 12,16
4, 8, 12,16
3.0-V LVTTL
4, 8, 12,16
4, 8, 12,16
3.3-V LVCMOS ⁽²⁾
2
2
3.3-V LVTTL ⁽²⁾
4, 8
4, 8
HSTL-12 Class I
8, 10,12
8, 10
HSTL-12 Class II
14
—
HSTL-15 Class I
8, 10, 12
8, 10, 12
HSTL-15 Class II
16
16
HSTL-18 Class I
8, 10, 12
8, 10, 12
HSTL-18 Class II
16
16
SSTL-18 Class I
8, 10, 12
8, 10, 12
SSTL-18 Class II
12, 16
12, 16
SSTL-2 Class I
8, 12
8, 12
SSTL-2 Class II
16
16
BLVDS
8, 12, 16
8, 12, 16
Notes to Table 6–1:
(1) The default setting in the Quartus II software is 50- OCT without calibration for all non-voltage reference and
HSTL/SSTL Class I I/O standards. The default setting is 25- OCT without calibration for HSTL/SSTL Class II I/O
standards.
(2) The default current setting in the Quartus II software is highlighted in bold italic for 3.3-V LVTTL and 3.3-V LVCMOS
I/O standards.
f For information about how to interface the Cyclone III device family with 3.3-, 3.0-, or
2.5-V systems, refer to the guidelines provided in AN 447: Interfacing Cyclone III and
Cyclone IV Devices with 3.3/3.0/2.5-V LVTTL/LVCMOS I/O Systems.
July 2012 Altera Corporation
Cyclone III Device Handbook
Volume 1