Real Time Clock Serial 32Byte 16-Pin PDIP

The CDP68HC68T1 Real-Time Clock provides atime/calendar function, a 32 byte static RAM, and a 3 wireSerial Peripheral Interface (SPI Bus). The primary function ofthe clock is to divide down a frequency input that can besupplied by the on-board oscillator in conjunction with anexternal crystal or by an external clock source. The internaloscillator can operate with a 32kHz, 1MHz, 2MHz, or 4MHzcrystal. An external clock source with a 32kHz, 1MHz, 2MHz,4MHz, 50Hz or 60Hz frequency can be used to drive theCDP68HC68T1. 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 BCDformat. In addition, 12 or 24 hour operation can be selected.In 12 hour mode, an AM/PM indicator is provided. The T1has a programmable output which can provide one of sevenoutputs for use elsewhere in the system.

• 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 is 2.2V
• Selectable Crystal or 50/60Hz Line Input
• Buffered Clock Output
• Battery Input Pin that Powers Oscillator and also Connects to VDD Pin When Power Fails
• Three Independent Interrupt Modes
  • Alarm
  • Periodic
  • Power-Down Sense
• Pb-Free Available (RoHS Compliant)