The DS1673S-5+ is a portable system controller in 20 pin WSOIC package. It operates at 5V and incorporates many of the functions necessary for low power portable products integrated into one chip. The device provides RTC, NV RAM controller, microprocessor monitor and 3-channel, 8bit ADC. Communication with DS1673 is established through a simple 3-wire interface. The RTC provides seconds, minutes, hours, day, date, month and year information with leap year compensation valid up to 2100. The RTC also provides an alarm interrupt. This interrupt works when the DS1673 is powered by system power supply or when in battery backup operation, so the alarm can be used to wake-up system that is powered down. The microprocessor monitor circuitry of DS1673 provides three basic functions. First, a precision temperature compensated reference and comparator circuit monitors the status of VCC. The second function is pushbutton reset control and third function is a watchdog timer.
Supply voltage range from 4.5V to 5.5V
Operating temperature range from 0°C to 70°C
UL recognized
300nA time keeping current, 1.5mA active supply current and 300µA standby current
Power control circuitry supports system power-on from day/time alarm
Halts microprocessor during power fail & automatically restarts microprocessor after power failure
Monitors pushbutton for external override
Halts and resets an out of control microprocessor
Automatic battery back-up and write protection to external SRAM
VCC trip point of 4.35V and reset active time of 250ms
