CDP68HC68 Datasheet

CMOS Serial Real-Time Clock With RAM and Power Sense/Control


The CDP68HC68 Real-Time Clock provides a time/calendar function, a 32 byte static RAM, and a 3 wire Serial Peripheral Interface (SPI Bus). The primary function of the clock is to divide down a frequency input that can be supplied by the on-board oscillator in conjunction with an external crystal or by an external clock source. The internal oscillator can operate with a 32kHz, 1MHz, 2MHz, or 4MHz crystal. An external clock source with a 32kHz, 1MHz, 2MHz, 4MHz, 50Hz or 60Hz frequency can be used to drive the CDP68HC68. The time registers hold seconds, minutes, and hours, while the calendar registers hold day-of-week, date, month, and year information. The data is stored in BCD format. In addition, 12 or 24 hour operation can be selected. In 12 hour mode, an AM/PM indicator is provided. The T1 has a programmable output which can provide one of seven outputs for use elsewhere in the system. CDP68HC68 Features • SPI (Serial Peripheral Interface)• Full Clock Features - Seconds, Minutes, Hours (12/24, AM/PM), Day of Week, Date, Month, Year (0 to 99), Automatic Leap Year• 32 Wordx8-Bit RAM• Seconds, Minutes, Hours Alarm• Automatic Power Loss Detection• Low Minimum Standby (Timekeeping) Voltage . . . . . 2.2V• Selectable Crystal or 50/60Hz Line Input• Buffered Clock Output


[{"Name":"Voltage - Supply","Value":"3 V ~ 6 V"},{"Name":"Voltage - Supply, Battery","Value":"2.2 V ~ 6 V"},{"Name":"Operating Temperature","Value":"-40°C ~ 85°C"},{"Name":"Memory Size","Value":"32B"},{"Name":"","Value":""},{"Name":"","Value":""},{"Name":"","Value":""},{"Name":"","Value":""},{"Name":"","Value":""},{"Name":"","Value":""}]

Manufacturer information


National Semiconductor was acquired by Texas Instruments. National Semiconductor delivers innovative analog technology by combining energy-efficient, easy-to-use products, with industry-leading WEBENCH® Designer tools. National Semiconductor is a leader in power management technology. Known for its easy-to-use analog integrated circuits and world-class supply chain, National's high-performance analog products enable its customers' systems to be more energy efficient.

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