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CDP1879, CDP1879ACE, CDP1879CD1

Table of contents:
Info of CDP1879
Info of CDP1879ACE
Info of CDP1879CD1

CDP1879, CDP1879ACE, CDP1879CD1 Selling Leads, Datasheet

MFG:HAR Package Cooled:DIP D/C:02+

CDP1879, CDP1879ACE, CDP1879CD1 Datasheet download

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Part Number: CDP1879

MFG: HAR

Package Cooled: DIP

D/C: 02+

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CDP1879 General Description

The CDP1879 real-time clock supplies time and calendar information from seconds to months in BCD format. It consists of 5 separately addressable and programmable counters that divide down an oscillator input. The clock input can have any one of 4 possible frequencies, allowing flexibility in the choice of crystal or external clock sources. Using an external 32kHz clock source, timekeeping can be performed down to 2.5V (see Standby (Timekeeping) Voltage Operation).

The device can be memory-mapped for use with any general-purpose microprocessor and has the additional capability of operating in the CDP1800 series input/output mode.

The real-time clock functions as a time-of-day/calendar with an alarm capability that can be set for combinations of seconds, minutes or hours. Alarm time is configured by loading alarm latches that activate an interrupt output through a comparator when the counter and alarm latch values are equal.

Fifteen selectable square-wave signals are available as a separate clock output signal and can also activate the interrupt output. A status register is available to indicate the interrupt source. The value in an 8 bit control register determines the operational characteristics of the device, by selecting the prescaler divisor and the clock output, and controls the load and alarm functions.

A transparent "freeze" circuit preclude clock rollover during counter and latch access times to assure stable and accurate values in the counters and alarm latches.

The CDP1879 is functionally identical to the CDP1879C-1. The CDP1879 has a recommended operating voltage range of 4V to 10.5V, and the CDP1879C-1 has a recommended operating voltage range of 4V to 6.5V. The CDP1879 and the CDP1879C-1 are supplied in 24 lead hermetic dual-in-line side-brazed ceramic packages (D suffix) and 24 lead dual-in-line plastic packages (E suffix).

CDP1879 Maximum Ratings

DC Supply Voltage Range, V_DD
   (Voltage referenced to V_SS Terminal)
   CDP1879 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . -0.5V to +11V
   CDP1879C-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +7V
Input Voltage Range, All Inputs . . . . . . . . . . . . -0.5 to V_DD +0.5V
DC Input Current, Any One Input . . . . . . . . . . . .. . . . . . . . ±10mA
Device Dissipation Per Output Transistor . . . . . . . . . . . . . . 40mW
   For T_A = Full Package Temperature Range
   (All Package Types)

CDP1879 Features

• CPU Interface for Use with General-Purpose Microprocessors
• Time Of Day/Calendar
• Reads Seconds, Minutes, Hours
• Reads Day of Month and Month
• Alarm Circuit With Seconds, Minutes or Hours Operation
• Power Down Mode
• Separate Clock Output Selects 1 of 15 Square Wave Signals
• Interrupt Output Activated By Clock Output and/or Alarm Circuit
• Date Integrity Sampling for Clock Rollover Eliminated
• On-Board Oscillator:
   - Crystal Operation CDP1879 at 10V. . . . . . . 4.19MHz, 2.09MHz or 1.048MHz
   - Crystal Operation CDP1879C-1 at 5V . . . . . 4.19MHz, 2.09MHz or 1.048MHz or 32kHz
   - External Clock Operation at 10V or 5V. . . . 4.19MHz, 2.09MHz, 1.048MHz or 32kHz
• Addressable in Memory Space or CDP1800 Series I/O Mode
• Low Standby (Timekeeping) Voltage with External Clock
• Related Literature
   - AN7275, Guide to the Use of CD1879 and CDP1879C1 Real Time Clock

CDP1879 Connection Diagram

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