DS1501WEN

User access to all registers within the DS1501/DS1511 is accomplished with a byte-wide interface .

The DS1501/DS1511 real-time clock/calendars have the following features: 1. RTC alarm, watchdog timer, power-on reset, battery monitors, 256 bytes NV SRAM, and a 32.768kHz output. 2. User access to all registers within the DS1501/DS1511 is accomplished with a byte-wide interface. 3. The RTC registers contain century, year, month, date, day, hours, minutes, and seconds data in 24-hour binary-coded decimal (BCD) format. Corrections for day of month and leap year are made automatically. 4. The RTC registers are double buffered into an internal and external set, with direct user access to the external set. Clock/calendar updates to the external set of registers can be disabled and enabled. 5. The DS1501/DS1511 contain their own power-fail circuitry that automatically deselects the device when the VCC supply falls below a power-fail trip point, providing data security during unpredictable system operation caused by low VCC levels. 6. The DS1501/DS1511 have interrupt (IRQ), power control (PWR), and reset (RST) outputs that can be used. DS1501/DS1511 Y2KC Watchdog Real-Time Clocks.

The applications listed for the DS1501/DS1511 devices in the document are Remote Systems, Battery-Backed Systems, Telecom Switches, Office Equipment, and Consumer Electronics.