Low-power silicon oscillator
20 August 2008
Electronics Technology
The STCL1120 family of silicon oscillators from STMicroelectronics combines fast startup and high immunity to shock, vibration and EMI with lower operating current and a chip-select control for easier and more efficient power management compared to other silicon-based devices.
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 a cost-effective and robust alternative to ceramic or quartz-based oscillators. As a further benefit, no external components are required, allowing designers to eliminate the capacitance matching typically necessary with ceramic resonators. The STCL1120 oscillators also operate directly from a 5 V supply.
By implementing an external chip-select pin, the device 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 μA. 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. 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.
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