DS1677E+

The DS1677E+ is a portable system controller in 20 pin TSSOP package. It is a circuit that incorporates many of the functions necessary for low-power portable products integrated into one chip. The device provides a RTC, NV RAM controller, microprocessor monitor, power-fail warning and a 3-channel, 8-bit ADC. Communication with the DS1677 is established through a simple 3-wire interface. The RTC provides seconds, minutes, hours, day, date, month and year information with leap year compensation. The RTC also provides an alarm interrupt. Automatic backup and write protection of an external SRAM is provided through the VCCO and CEO (active-low) pins. The backup energy source used to power the RTC is also used to retain RAM data in the absence of VCC through the VCCO pin. CEO (active-low), the chip-enable output to SRAM, is controlled during power transients to prevent data corruption.

• Supply voltage range from 4.5V to 5.5V, battery voltage range from 2.5V to 3.7V
• 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
• 1.25V threshold detector for power-fail warning
• UL recognized
• Operating temperature range from 0°C to 70°C
• Clock & Timing; Low-power portable

Applications

Clock & Timing

Warnings

Market demand for this product has caused an extension in leadtimes. Delivery dates may fluctuate. Product exempt from discounts.

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party