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UC1875L883B Datasheet(PDF) 8 Page - Texas Instruments |
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UC1875L883B Datasheet(HTML) 8 Page - Texas Instruments |
8 / 19 page 8 UC1875/6/7/8 UC2875/6/7/8 UC3875/6/7/8 APPLICATION INFORMATION (cont.) Synchronizing The Oscillator The CLOCKSYNC pin of the oscillator may be used to synchronize multiple UC1875 devices simply by connecting the CLOCKSYNC of each UC1875 to the others: Syncing to external TTL/CMOS All ICs will sync to chip with the fastest local oscillator. R1&RN may be needed to keep sync pulse narrow due to capacitance on line. R1&RN may also be needed to properly terminate RSYNC line. Although each UC1875/6/7/8 has a local oscillator fre- quency, the group of devices will synchronize to the fastest oscillator driving the CLOCKSYNC pin. This ar- rangement allows the synchronizing connection be- tween ICs to be broken without any local loss of functionality. Synchronizing the device to an external clock signal may be accomplished with a minimum of external cir- cuitry, as shown in the previous figure. Capacitive loading on the CLOCKSYNC pin will in- crease the clock pulse width, and may adversely effect system performance. Therefore, a resistor to ground from the CLOCKSYNC pin is optional, but may be re- quired to offset capacitive loading on this pin. These re- sistors are shown in the oscillator schematics as R1, RN. ICs will sync to fastest chip or TTL clock if it is higher frequency. R&RN may be needed for same reasons as above UDG-95080 UDG-95081 1875/6/7/8s only |
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