EP3C25F256C7N Altera, EP3C25F256C7N Datasheet - Page 139

• Manufacturer Part Number: EP3C25F256C7N
• Description: IC CYCLONE III FPGA 256-FBGA
• Manufacturer: Altera
• Series: Cyclone® IIIr

Specifications of EP3C25F256C7N

• Number Of Logic Elements/cells: 24624
• Number Of Labs/clbs: 1539
• Total Ram Bits: 608256
• Number Of I /o: 156
• Voltage - Supply: 1.15 V ~ 1.25 V
• Mounting Type: Surface Mount
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 256-FBGA
• Family Name: Cyclone III
• Number Of Logic Blocks/elements: 24624
• # I/os (max): 156
• Frequency (max): 437.5MHz
• Process Technology: 65nm
• Operating Supply Voltage (typ): 1.2V
• Logic Cells: 24624
• Ram Bits: 608256
• Operating Supply Voltage (min): 1.15V
• Operating Supply Voltage (max): 1.25V
• Operating Temp Range: 0C to 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 256
• Package Type: FBGA
• For Use With: 544-2370 - KIT STARTER CYCLONE III EP3C25
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Gates: -
• Lead Free Status / Rohs Status: Compliant
• Other names: Q4433068

Chapter 7: High-Speed Differential Interfaces in the Cyclone III Device Family
True Output Buffer Feature
Figure 7–13. Differential HSTL Class II Interface
Note to
(1) PLL output clock pins do not support differential HSTL Class II I/O standard.
True Output Buffer Feature
Programmable Pre-Emphasis
Figure 7–14. The Output Signal with Pre-Emphasis
© December 2009
Figure
Output Buffer (1)
7–13:
Altera Corporation
Figure 7–13
Cyclone III device family true differential transmitters offer programmable
pre-emphasis—you can choose to turn it on or off. The default setting is on.
The programmable pre-emphasis boosts the high frequencies of the output signal to
compensate the frequency-dependant attenuation of the transmission line to
maximize the data eye opening at the far-end receiver. Without pre-emphasis, the
output current is limited by the V
transmitter. At high frequency, the slew rate may not be fast enough to reach full V
before the next edge; this may lead to pattern dependent jitter. With pre-emphasis, the
output current is momentarily boosted during switching to increase the output slew
rate. The overshoot produced by this extra switching current is different from the
overshoot caused by signal reflection. This overshoot happens only during switching,
and does not produce ringing.
Figure 7–14
shows the differential HSTL Class II interface.
shows the differential output signal with pre-emphasis.
Negative channel (n)
V
Positive channel (p)
TT
50 Ω
V
TT
50 Ω
Z 0 = 50 Ω
Z 0 = 50 Ω
OD
specification and the output impedance of the
V
TT
Overshoot
Undershoot
V
50 Ω
OD
V
TT
50 Ω
Cyclone III Device Handbook, Volume 1
Receiver
7–15
OD