Timer Ic

The real-timeclocks (RTCs) DS12885, DS12887, and DS12C887 are designed to be straight alternatives for the DS1285 and DS1287. A real-time clock/calendar, one time-of-day alarm, three maskable interrupts with a common interrupt output, a programmable square wave, and 114 bytes of battery-backed static RAM are all included in the devices (113 bytes in the DS12C887 andDS12C887A). In a 24-pin enclosed DIP device, the DS12887 incorporates a quartz crystal and a lithium energy supply. The DS12C887 adds a century byte to the 32h address.For months with fewer than 31 days, the date at the end of the month is automatically changed on all devices, including adjustment for leap years. The gadgets also have an AM/PM indicator and may be set to work in either a 24-hour or 12-hour mode. The status of VCC is monitored using a precision temperature-compensated circuit. When the device detects a primary power outage, it immediately switches to a backup supply. When primary power is unavailable, a lithium coin-cell battery can be attached to the VBAT input pin of the DS12885 to keep the time and date running. A multiplexed byte-wide interface is used to access the device, which supports both Intel and Motorola modes.

The M48T08/18/08Y is a non-volatile pin and func-tion equivalent to any JEDEC standard 8K x 8SRAM. It also easily fits into many ROM, EPROM,and EEPROM sockets, providing the non-volatilityof PROMs without any requirement for specialWRITE timing or limitations on the number ofWRITEs that can be performed

I2C real-time clock (RTC) featuring an inbuilt temperature-compensated crystal oscillator (TCXO) and crystal, the DS3231 is a low-cost device that is remarkably precise. The gadget has a battery input and can continue to retain accurate time even if its primary power source is interrupted. The addition of the crystal resonator improves the instrument's long-term precision and lowers the number of pieces required to produce it. The DS3231 comes in a 16-pin, 300-mil SO box and is supplied in commercial and industrial temperature ranges. The RTC keeps track of information regarding seconds, minutes, hours, days, dates, months, and years. For months with fewer than 31 days, the dates at the end of the month is automatically changed to account for leap years. With an AM/PM indication, the clock may run on either a 12- or 24-hour basis.There are two programmable time-of-day alarms as well as a programmable square-wave output.

I2C bidirectional bus is used to serially transport address and data. A precise temperature-compensated voltage reference and comparator circuit keeps track of VCC's condition to detect power outages, offer a reset output, and, if necessary, switch automatically to the backup source. In addition, the RST pin is watched as a push button input for external reset generation.

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