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Silicon oscillator reduces parts count, streamlines design

Geneva, Switzerland — STMicroelectronics has introduced the STCL1120 family of silicon oscillators that combines fast start-up and high immunity to shock, vibration and electromagnetic interference (EMI) with lower operating current and a chip-select control for easier and more efficient power management compared to other silicon-based devices, said ST.

The first STCL1120 family members to be introduced are 10-, 12- and 16-MHz devices. The short startup time of 50 microseconds and 0.65-mA operating current for the 12-MHz version combine with the chip-select capability to enable power savings for engineers seeking an alternative to ceramic or quartz-based oscillators. In addition, no external components are required, eliminating the need for capacitance matching typically necessary with ceramic resonators. The STCL1120 oscillators operate directly from a 5-V supply.

By implementing an external chip-select pin, the STCL1120 provides an easy way for engineers to stop the clock when the application is in standby mode, gaining extra power savings by reducing the oscillator current to less than 3 microamps, STMicro said. The push-pull, CMOS-compatible output produces a square wave for direct interfacing with on-board components including logic devices, microcontrollers, FPGAs and ASICs.

The fixed operating frequency is accurate to within ±1.5% throughout all operating conditions. A 32-kHz silicon oscillator is also offered and further variants of the oscillators, with tighter accuracy, will be introduced in the future.

Specified for operation from -20° to +85°C, the STCL1120 serves motor-control applications, home appliances, building controllers, display drivers, advanced battery chargers, and low-speed USB peripherals such as computer keyboards or mice.

Pricing: Starts at $0.50 in quantities of 10,000.
Availability: Packaged in a 5-lead SOT23 package, the STCL1120 family is available
immediately in production quantities.
Product information: silicon oscillators and STCL1120

STMicroelectronics , 1-781-861-2650, www.st.com

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