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PDF DS21610-DS21610SN Data sheet ( Hoja de datos )
| Número de pieza | DS21610-DS21610SN | |
| Descripción | 3.3V/5V Clock Rate Adapter | |
| Fabricantes | Dallas Semiconducotr | |
| Logotipo |  |
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www.maxim-ic.com
GENERAL DESCRIPTION
The DS21610 is a multirate, low-jitter clock adapter
that converts E-carrier and T-carrier clocks to
multiple PDH carrier clock rates. Two clock outputs
are available that are frequency-locked to the input
clock. The clock outputs along with an 8kHz frame-
sync output can be phase-aligned to a frame-sync
input. The device is backward compatible with the
LXP610 and operates from either a 3.3V or 5V
supply. All modes of operation include a standard
8kHz output.
PIN CONFIGURATION
TOP VIEW
Dallas
Semiconductor
DS21610
DS21610
3.3V/5V Clock Rate Adapter
FEATURES
§ Direct Replacement for LXP610SE
§ Converts E-Carrier Clock Rates to T-Carrier
Clock Rates
§ Converts T-Carrier Clock Rates to E-Carrier
Clock Rates
§ 3.3V or 5V Supply
§ Low Jitter Output
§ Multiple Output Clocks Synchronized to Input
Clock
§ 8kHz Frequency-Locked Output for all Operation
Modes
§ No External Components Required
§ 16-Pin SO and 28-Pin PLCC
§ Industrial Temperature Range: -40ºC to +85ºC
ORDERING INFORMATION
PART
DS21610SN
DS21610QN
TEMP RANGE
-40ºC to +85ºC
-40ºC to +85ºC
PIN-PACKAGE
16 SO
29 PLCC
SO
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
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DS21610 3.3V/5V Clock Rate Adapter
2. FUNCTIONAL DESCRIPTION
A clock input at CLKIN is converted to various clocks available on CLKOUT1 and CLKOUT2. Additionally, an 8kHz
clock locked to CLKIN and SYNCIN (if present) is always available at the SYNCOUT pin. The pulse width of the
SYNCOUT is selectable. It can be one or one-half the clock period of CLKIN, centered on the rising edge of
CLKIN. Pins P1 to P4 are used to select the various clock rates and operational modes. Table 2-A and Table 2-B
list the various operational modes of the DS21610.
CLKIN, CLKOUT1, and CLCKOUT2 are always frequency-locked. They can all be phase-locked to a system
frame-sync pulse. A frame-sync pulse applied to SYNCIN will cause CLKIN and CLKOUT1 and CLKOUT2 to be
phased-locked to that sync pulse. This causes the clocks to have a fixed alignment at the frame-sync boundaries.
The signal applied to SYNCIN can be 8kHz or some integer subrate such as 1kHz, 2kHz, or 4kHz. Phase
synchronization occurs within a maximum of 50ms when SYNCIN is 8kHz.
Table 2-A. Program Pin Functions (SEL = 0)
P4 P3 P2 P1
00 0 0
00 0 1
00 1 0
00 1 1
01 0 0
01 0 1
01 1 0
01 1 1
10 0 0
10 0 1
10 1 0
10 1 1
11 0 0
11 0 1
11 1 0
11 1 1
CLKIN
1.544
3.088
1.544
1.544
1.544
6.176
1.544
6.176
3.088
3.088
3.088
1.544
6.176
6.176
6.176
6.176
CLKOUT1
2.048
2.048
2.048
2.048
2.560
4.096
2.560
2.048
2.048
4.096
2.048
4.096
2.560
4.096
2.560
4.096
CLKOUT2
6.144
8.192
6.144
8.192
7.680
8.192
7.680
8.192
6.144
8.192
6.144
8.192
7.680
8.192
7.680
8.192
SYNCOUT
Long
Short
Long
Short
Long
Long
Long
Short
Long
Long
Long
Long
Long
Long
Long
Long
Table 2-B. Program Pin Functions (SEL = 1)
P4 P3 P2 P1
00 0 0
00 0 1
00 1 0
00 1 1
01 0 0
01 0 1
01 1 0
01 1 1
10 0 0
10 0 1
10 1 0
10 1 1
11 0 0
11 0 1
11 1 0
11 1 1
CLKIN
2.048
2.048
2.048
2.048
2.560
8.192
2.560
8.192
2.048
4.096
2.048
4.096
2.560
8.192
2.560
8.192
CLKOUT1
3.088
3.088
1.544
1.544
1.544
3.088
1.544
1.544
3.088
3.088
3.088
1.544
1.544
3.088
1.544
1.544
CLKOUT2
6.176
6.176
6.176
6.176
7.720
6.176
7.720
6.176
6.176
6.176
6.176
6.176
7.720
6.176
7.720
6.176
SYNCOUT
Long
Long
Long
Long
Long
Long
Long
Long
Long
Long
Long
Long
Long
Long
Long
Long
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DS21610 3.3V/5V Clock Rate Adapter
Figure 4-2. Output Frame-Sync Alignment When CLKOIT2 = 2 x CLKOUT1
CLKOUT1
(4.096MHz)
CLKOUT2
(8.192MHz)
SYNCOUT
CLKOUT1
(3.088MHz)
CLKOUT2
(6.176MHz)
SYNCOUT
Figure 4-3. Output Frame-Sync Alignment When CLKOUT2 = 3 x CLKOUT1
CLKOUT1
(2.56MHz or
2.048MHz)
CLKOUT2
(7.680MHz or
6.144MHz)
SYNCOUT
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| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet DS21610-DS21610SN.PDF ] | |
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