Description
The ELM440 is an 8 pin digital divider integrated circuit, that provides both 60Hz and 1Hz outputs from a common 3.58MHz NTSC colourburst crystal.
Externally, the designer need only provide the crystal and two appropriate loading capacitors, as well as a suitably bypassed power supply. Internal oscillator circuits then use this reference frequency to precisely derive a stable 60Hz signal. This signal is then further divided to provide a 1Hz output.

FEATUREs
• Low power CMOS design
• Wide supply range - 3.0 to 5.5 volt operation
• Generates both 60Hz and 1Hz references
• Automatically synchronizes to the line frequency for long term stability, when it’s available
• Uses a standard 3.58MHz crystal for the time reference if there is no sync input
• High current drive outputs - up to 25 mA

APPLICATIONs
• Stable 60Hz and 1Hz reference sources
• Master oscillator for clock / timekeeping functions
• DC powered backup 60Hz reference signal