Clock-distribution ICs
29 October 2008
Electronics Technology
STMicroelectronics has announced new clock-distribution ICs providing per-channel output-enable controls for precision clock management in embedded and handheld applications. The two-channel STCD1020, three-channel STCD1030, and four-channel STCD1040 distribute a single master clock to multiple clock domains, allowing designers to eliminate multiple individual-crystal clock sources for chipsets supporting GSM, Bluetooth, WLAN, WiMAX or other RF communications, as well as set-top boxes. From receipt of an Enable signal, the selected channel’s output is stabilised within 50 microseconds from standby. High channel isolation ensures low crosstalk and low phase-noise directly enhances signal quality. Designed for transmission of a single-ended sine-wave or square-wave in the range 10 MHz to 52 MHz, these ICs also integrate an AC coupling capacitor to further minimise external components. The standard supply voltage is 2,5 V to 3,6 V, while the option of 1,65 V–2,75 V operation allows use with low-voltage peripherals.
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