MK2049-02 Ver la hoja de datos (PDF) - Integrated Circuit Systems
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MK2049-02 Datasheet PDF : 12 Pages
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MK2049-02/03
Communications Clock PLLs
MK2049-03 Output Decoding Table – External Mode (MHz)
ICLK
8 kHz
8 kHz
8 kHz
8 kHz
8 kHz
8 kHz
8 kHz
8 kHz
8 kHz
8 kHz
8 kHz
8 kHz
FS3 FS2 FS1 FS0
0000
0001
0010
0011
0100
0101
0110
0111
1010
1011
1100
1101
CLK1
1.544
2.048
18.688
7.68
19.44
16.384
24.576
8.64
12.416
18.528
10.24
4.096
CLK2
3.088
4.096
37.376
15.36
38.88
32.768
49.152
17.28
24.832
37.056
20.48
8.192
CLK3
8 kHz
8 kHz
8 kHz
8 kHz
8 kHz
8 kHz
8 kHz
8 kHz
8 kHz
1.544 MHz
8 kHz
8 kHz
Crystal
12.352
12.288
9.344
10.24
9.72
8.192
12.288
11.52
12.416
12.352
10.24
8.192
= No Zero (Fixed) I/O Delay for these selections shown in the shaded boxes.
MK2049-03 Output Decoding Table – Loop Timing Mode (MHz) for T1/E1
ICLK
1.544
2.048
FS3 FS2 FS1 FS0
1000
1001
CLK1
1.544
2.048
CLK2
3.088
4.096
Crystal
12.352
12.288
CLK3
N/A
N/A
MK2049-03 Output Decoding Table – Buffer Mode (MHz)
ICLK
19 - 28
10 - 14
FS3 FS2 FS1 FS0
1110
1111
CLK1
ICLK/2
2*ICLK
CLK2 Crystal
ICLK ICLK/2
4*ICLK ICLK
• 0 = connect directly to ground, 1 = connect directly to VDD.
• Crystal is connected to pins 2 and 3; clock input is applied to pin 13.
CLK3
N/A
Low
OPERATING MODES
The MK2049-02/03 have three operating modes: External, Loop Timing, and Buffer. Although each
mode uses an input clock to generate various output clocks, there are important differences in their input
and crystal requirements.
External Mode
The MK2049-02/03 accept an external 8 kHz clock and will produce a number of common communica-
tion clock frequencies. The 8 kHz input clock does not need to have a 50% duty cycle; a “high” or “on”
pulse as narrow as 10 ns is acceptable. In the MK2049-02, the rising edge of CLK2 is aligned with the
rising edge of the 8 kHz ICLK; refer to Figure 1 for more details. In the MK2049-03, the rising edges of
CLK1 and CLK2 are both aligned with the rising edge of the 8 kHz ICLK (unless noted in the shaded area
of the table); refer to Figure 2 for more details.
MDS 2049-02/03 B
5
Revision 040601
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • (408)295-9800tel• www.icst.com
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