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DS21610 Datasheet(PDF) 5 Page - Dallas Semiconductor |
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DS21610 Datasheet(HTML) 5 Page - Dallas Semiconductor |
5 / 15 page DS21610 3.3V/5V Clock Rate Adapter 5 of 15 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 CLKIN CLKOUT1 CLKOUT2 SYNCOUT 0 0 0 0 1.544 2.048 6.144 Long 0 0 0 1 3.088 2.048 8.192 Short 0 0 1 0 1.544 2.048 6.144 Long 0 0 1 1 1.544 2.048 8.192 Short 0 1 0 0 1.544 2.560 7.680 Long 0 1 0 1 6.176 4.096 8.192 Long 0 1 1 0 1.544 2.560 7.680 Long 0 1 1 1 6.176 2.048 8.192 Short 1 0 0 0 3.088 2.048 6.144 Long 1 0 0 1 3.088 4.096 8.192 Long 1 0 1 0 3.088 2.048 6.144 Long 1 0 1 1 1.544 4.096 8.192 Long 1 1 0 0 6.176 2.560 7.680 Long 1 1 0 1 6.176 4.096 8.192 Long 1 1 1 0 6.176 2.560 7.680 Long 1 1 1 1 6.176 4.096 8.192 Long Table 2-B. Program Pin Functions (SEL = 1) P4 P3 P2 P1 CLKIN CLKOUT1 CLKOUT2 SYNCOUT 0 0 0 0 2.048 3.088 6.176 Long 0 0 0 1 2.048 3.088 6.176 Long 0 0 1 0 2.048 1.544 6.176 Long 0 0 1 1 2.048 1.544 6.176 Long 0 1 0 0 2.560 1.544 7.720 Long 0 1 0 1 8.192 3.088 6.176 Long 0 1 1 0 2.560 1.544 7.720 Long 0 1 1 1 8.192 1.544 6.176 Long 1 0 0 0 2.048 3.088 6.176 Long 1 0 0 1 4.096 3.088 6.176 Long 1 0 1 0 2.048 3.088 6.176 Long 1 0 1 1 4.096 1.544 6.176 Long 1 1 0 0 2.560 1.544 7.720 Long 1 1 0 1 8.192 3.088 6.176 Long 1 1 1 0 2.560 1.544 7.720 Long 1 1 1 1 8.192 1.544 6.176 Long |
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