EP3C40F780I7 Altera, EP3C40F780I7 Datasheet - Page 72

IC CYCLONE III FPGA 40K 780 FBGA

EP3C40F780I7

Manufacturer Part Number
EP3C40F780I7
Description
IC CYCLONE III FPGA 40K 780 FBGA
Manufacturer
Altera
Series
Cyclone® IIIr

Specifications of EP3C40F780I7

Number Of Logic Elements/cells
39600
Number Of Labs/clbs
2475
Total Ram Bits
1161216
Number Of I /o
535
Voltage - Supply
1.15 V ~ 1.25 V
Mounting Type
Surface Mount
Operating Temperature
-40°C ~ 100°C
Package / Case
780-FBGA
Family Name
Cyclone III
Number Of Logic Blocks/elements
39600
# I/os (max)
535
Frequency (max)
437.5MHz
Process Technology
65nm
Operating Supply Voltage (typ)
1.2V
Logic Cells
39600
Ram Bits
1161216
Operating Supply Voltage (min)
1.15V
Operating Supply Voltage (max)
1.25V
Operating Temp Range
-40C to 100C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
780
Package Type
FBGA
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Number Of Gates
-
Lead Free Status / Rohs Status
Not Compliant

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0
5–8
clkena Signals
Figure 5–5. clkena Implementation: Output Enable
Cyclone III Device Handbook, Volume 1
clkin
clkena
clk_out
1
1
The Cyclone III device family supports clkena signals at the GCLK network level.
This allows you to gate-off the clock even when a PLL is used. Upon re-enabling the
output clock, the PLL does not need a resynchronization or re-lock period because the
circuit gates off the clock at the clock network level. In addition, the PLL can remain
locked independent of the clkena signals because the loop-related counters are not
affected.
Figure 5–4
Figure 5–4. clkena Implementation
The clkena circuitry controlling the output C0 of the PLL to an output pin is
implemented with two registers instead of a single register, as shown in
Figure 5–5
signal is sampled on the falling edge of the clock (clkin).
This feature is useful for applications that require low power or sleep mode.
The clkena signal can also disable clock outputs if the system is not tolerant to
frequency overshoot during PLL resynchronization.
shows how to implement the clkena signal.
shows the waveform example for a clock output enable. The clkena
clkena
clkin
Chapter 5: Clock Networks and PLLs in the Cyclone III Device Family
D
Q
clkena_out
© December 2009 Altera Corporation
clk_out
Figure
Clock Networks
5–4.

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