EM7604

General Description

The EM7604 is an advanced low power CMOS circuit intended to be used together with a 32.768 kHz tuning fork crystal as a low frequency clock oscillator. Except the crystal, no other external components are required. In order to achieve a high frequency accuracy, the matched crystals should have a ± 20ppm tolerance or tighter. Very low power consumption is guaranteed over an extremely wide supply voltage and temperature range. The EM7604 is available in a small SOT23-6 package and is a completely lead free product.

Features

• Very low power consumption: typ. 300nA
• On chip integrated oscillation capacitors: CL=8pF
• Matched low cost SMD quartz available from Micro Crystal, Switzerland
• Compatibility with crystals having high series resistance
• Very tight frequency tolerance
• Excellent oscillator stability: 0.2 ppm/V
• Wide supply voltage range: 1.2V to 5.5V
• Operating temperature range: -40°C to +125°C
• Small SOT23-6 package
• 100% lead free, RoHS compliant

Applications

• General purpose clock generator for digital systems
• Clock drivers for Real Time Clocks
• Timekeeping in network servers and computers
• Electricity, gas and water metering
• Portable field communication
• Mobile phones
• Solution for problems with embedded quartz oscillators