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Description
Real Time Clock with NV RAM Control
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FEATURES
● Direct replacement for IBM AT computer clock/calendar
● Functionally compatible with theDS1285/DS1287
● Available as chip (DS14285, DS14285S, or DS14285Q) or stand-alone module with embedded lithium battery and crystal (DS14287)
● Automatic backup supply and write protection to make external SRAM nonvolatile
● Counts seconds, minutes, hours, days, day of the week, date, month, and year with leap year compensation valid up to 2100
● Binary or BCD representation of time, calendar, and alarm
● 12- or 24-hour clock with AM and PM in 12-hour mode
● Daylight Savings Time option
● Multiplex bus for pin efficiency
● Interfaced with software as 128RAM locations
- 14 bytes of clock and control registers
- 114 bytes of general purpose RAM
● Programmable square wave output signal
● Bus-compatible interrupt signals ( IRQ)
● Three interrupts are separately software-maskable and testable
- Time-of-day alarm once/second to once/day
- Periodic rates from 122 μs to 500 ms
- End of clock update cycle
● Optional industrial temperature version available DS14285 DIP,SOIC, and PLCC
DESCRIPTION
The DS14285/DS14287Real Time Clock with NVRAM Control provides the industry standard DS1287 clock function with the additional feature of providing nonvolatile control for an external SRAM. Functions include a nonvolatile time-of-day clock, alarm, 100-year calendar, programmable interrupt, square wave generator, and 114 bytes of nonvolatile static RAM.For the DS14287 a lithium energy source, quartz crystal, and write protection circuitry are contained within a 24-pin dual in-line package. The DS14285 requires an external quartz crystal connected to the X1 and X2 pins as well as an external energy source connected to the VBAT pin. A standard 32.768 kHz quartz crystal can be directly connected to the DS14285 via pins 1 and 2 (X1,X2). The crystal selected for use should have a specified load capacitance(CL) of 6 pF.For more information on crystal selection and crystal layout considerations, please consult Application Note 58,"Crystal Considerations with Dallas Real-time Clocks.”
The DS14285/DS14287uses its backup energy source and battery-backup controller to make a standard CMOS static RAM nonvolatile during power-fail conditions. During power fail, the DS14285/DS14287 automatically write-protects the external SRAM and provides a VCC output sourced from its internal battery.
For the DS14287 the internal lithium cell is electrically isolated from the clock and memory when shipped from the factory.This isolation is removed after the first application of VCC, allowing the lithium cell to provide data retention to the clock,internal RAM,VCCO and CEO on subsequent power-downs. Care must be taken after this isolation has been broken to avoid inadvertently discharging the lithium cell through the VCCO and CEO pins.
Preview of the first 3 pages of the data sheet
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10000 buyer reviews from United States
James Wright
Length of registration:7 years
This integrated circuit is great! It is easy to use and has a wide range of features. It is very reliable and has a long life span. The instructions are clear and easy to follow. I have used this integrated circuit in several projects and have been very pleased with the results. Highly recommended!
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03/17/2023
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Warranty
All UTSOURCE purchases have a 60 days money back return policy, plus a 90 days UTSOURCE warranty against any manufacturing defects.This warranty shall not apply to any item where defects have been caused by improper customer assembly, failure by customer to follow instructions, product modification, negligent or improper operation.
DS14287
DS14287 has several brands around the world that may have alternate names for DS14287 due to regional differences or acquisition. DS14287 may also be known as the following names:
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Stock Status: 10000
Minimum: 1
Total Price:
Unit Price:4.19100
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