ep2sgx30c Altera Corporation, ep2sgx30c Datasheet - Page 292
ep2sgx30c
Manufacturer Part Number
ep2sgx30c
Description
Stratix Ii Gx Device Data Sheet
Manufacturer
Altera Corporation
Datasheet
1.EP2SGX30C.pdf
(314 pages)
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Duty Cycle Distortion
4–122
Stratix II GX Device Handbook, Volume 1
Note to
(1)
3.3-V LVTTL
3.3-V LVCMOS
2.5 V
1.8 V
1.5-V LVCMOS
SSTL-2 Class I
SSTL-2 Class II
SSTL-18 Class I
1.8-V HSTL Class I
1.5-V HSTL Class I
LVDS
Table 4–100. Maximum DCD for DDIO Output on Row I/O Pins Without PLL in the Clock Path for -3 Devices
Note (1)
Maximum DCD (ps) for
Row DDIO Output I/O
The information in
Table
Standard
4–100:
Table 4–100
Here is an example for calculating the DCD in percentage for a DDIO
output on a row I/O on a -3 device:
If the input I/O standard is 2.5-V SSTL-2 and the DDIO output I/O
standard is SSTL-2 Class= II, the maximum DCD is 60 ps (see
Table
Calculate the DCD as a percentage:
3.3 and
2.5 V
260
210
195
150
255
175
170
155
150
150
180
assumes the input clock has zero DCD.
T = 1/ f = 1 / 267 MHz = 3.745 ns = 3,745 ps
(T/2 – DCD) / T = (3,745 ps/2 – 60 ps) / 3745 ps = 48.4% (for low
boundary)
(T/2 + DCD) / T = (3,745 ps/2 + 60 ps) / 3745 ps = 51.6% (for high
boundary)
TTL/CMOS
4–100). If the clock frequency is 267 MHz, the clock period T is:
Input I/O Standard (No PLL in Clock Path)
1.8 and
1.5 V
380
330
315
265
370
295
290
275
270
270
180
SSTL-2
2.5 V
145
100
140
180
85
85
65
60
55
60
55
SSTL/HSTL
1.8 and
1.5 V
145
100
140
180
85
85
65
60
50
60
55
Altera Corporation
LVDS
3.3 V
110
120
105
180
65
75
70
75
90
95
90
October 2007
Unit
ps
ps
ps
ps
ps
ps
ps
ps
ps
ps
ps
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