STMicroelectronics Launches System Clock Distribution with ICs

STMicroelectronics has announced six devices in a series of clock-distribution ICs to provide 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 save component count, board complexity and bill-of-materials costs in multi-mode devices such as cellular handsets and M2M (machine-to-machine) communications. By distributing a single master clock to multiple clock domains, designers can eliminate multiple individual-crystal clock sources for chipsets supporting GSM, Bluetooth, WLAN, WiMAX or other RF communications, and also set-top boxes. With fewer crystal components, these applications also benefit from greater physical ruggedness.



The individual output-enable controls combine with a fast startup time, as well as 2.6mA typical quiescent current and 1 microamp standby current for the STCD1040, to minimize power consumption in battery-powered and embedded applications. Designed for transmission of a single-ended sine-wave or square-wave in the range 10MHz to 52MHz, these clock-distribution ICs also integrate an AC coupling capacitor to further minimize external components. They are capable of driving loads up to 20pF to simplify output circuitry. The standard supply voltage is 2.5V to 3.6V, while the option of 1.65V-2.75V operation allows use with low-voltage peripherals. The specified operating temperature range of –40 degrees C to +85 degrees C allows use in a wide variety of commercial and industrial applications. The devices’ small TDFN packages deliver additional space savings, with the STCD1020 offered in a 2 x 2mm 8-lead package, the STCD1030 in a 2 x 2.5mm 10-lead package, and the STCD1040 in a 2 x 3mm 12-lead package. The STCD1040 is priced at $0.80 in quantities of 10,000 pieces.