Products > Integrated Circuits (ICs) > Clock & Timer ICs > DS12887A

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DS12887A

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Real Time Clock Multiplexed 114Byte

  • Package/Case :
  • DIP-24
  • Product Categories :
  • Clock/Timing - Real Time Clocks EPROM
  • RoHs Status:
  • Lead free / RoHS Compliant
  • Marking Code:
  • DS12887A
  • In-stock:
  • 500

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DS12887A Product Details

General Description 

The DS12885, DS12887, and DS12C887 real-time clocks (RTCs) are designed to be direct replacements for the DS1285 and DS1287. The devices provide 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 batterybacked static RAM (113 bytes in the DS12C887 and DS12C887A). The DS12887A integrates a quartz crystal and lithium energy source into a 24-pin encapsulated DIP package. The DS12C887 adds a century byte at address 32h. For all devices, the date at the end of the month is automatically adjusted for months with fewer than 31 days, including correction for leap years. The devices also operate in either 24-hour or 12-hour format with an AM/PM indicator. A precision temperature-compensated circuit monitors the status of VCC. If a primary power failure is detected, the device automatically switches to a backup supply. A lithium coin-cell battery can be connected to the VBAT input pin on the DS12885 to maintain time and date operation when primary power is absent. The device is accessed through a multiplexed byte-wide interface, which supports both Intel and Motorola modes.

Applications
Embedded Systems
Utility Meters
Security Systems
Network Hubs, Bridges, and Routers


DS12887A

Feature

  • Drop-In Replacement for IBM AT Computer Clock/Calendar
  • RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Through 2099
  • Binary or BCD Time Representation
  • 12-Hour or 24-Hour Clock with AM and PM in 12-Hour Mode
  • Daylight Saving Time Option
  • Selectable Intel or Motorola Bus Timing
  • Interfaced with Software as 128 RAM Locations
  • 14 Bytes of Clock and Control Registers
  • 114 Bytes of General-Purpose, Battery-Backed RAM (113 Bytes in the DS12C887 and DS12C887A)
  • RAM Clear Function (DS12885, DS12887A, and DS12C887A)
  • Interrupt Output with Three Independently Maskable Interrupt Flags
  • Time-of-Day Alarm Once Per Second to Once Per Day
  • Periodic Rates from 122μs to 500ms
  • End-of-Clock Update Cycle Flag
  • Programmable Square-Wave Output
  • Automatic Power-Fail Detect and Switch Circuitry
  • Optional 28-Pin PLCC Surface Mount Package or 32-Pin TQFP (DS12885)
  • Optional Encapsulated DIP (EDIP) Package with Integrated Crystal and Battery (DS12887, DS12887A, DS12C887, DS12C887A)
  • Optional Industrial Temperature Range Available

DS12887A Products

Applications

  • Embedded Systems
  • Network Hubs, Bridges, and Routers
  • Security Systems
  • Utility Meters

DS12887A Pinout
(Picture: Pinout)

DS12887A Block Diagram
(Picture: Diagram)

Technical Parameters

  • Function
  • Clock, Calendar, Alarm
  • RTC Bus Interface
  • Multiplexed
  • Date Format
  • DW:DM:M:Y, Binary
  • Time Format
  • HH:MM:SS, Binary
  • RTC Memory Size
  • 114 B
  • Supply Voltage Max
  • 5.5 V
  • Supply Voltage Min
  • 4.5 V
  • Maximum Operating Temperature
  • + 70 C
  • Minimum Operating Temperature
  • 0 C
  • Mounting Style
  • Through Hole
  • Package / Case
  • eDIP
  • Series
  • DS12885, DS12887
  • Part # Aliases
  • 90-12887-A01

DS12887A Documents

DS12887A Related Products

Ratings and Reviews (1)

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  • **icke***
    2020-03-28

    Excellent seller. Good prices, good products.

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All the products will packing in anti-staticbag. Ship with ESD antistatic protection.

Outside ESD packing’s lable will use ourcompany’s information: Part Mumber, Brand and Quantity.

We will inspect all the goods before shipment,ensure all the products at good condition and ensure the parts are new originalmatch datasheet.

After all the goods are ensure no problems afterpacking, we will packing safely and send by global express. It exhibitsexcellent puncture and tear resistance along with good seal integrity.

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Guarantees

1.We provide 90 days warranty.

2.If some of the items you received aren't of perfect quality, we would resiponsibly arrange your refund or replacement. But the items must remain their orginal condition.

FAQ:

Q: How does Jotrin guarantee that DS12887A is the original manufacturer or agent of MAXIM?
We have a professional business development department to strictly test and verify the qualifications of MAXIM original manufacturers and agents. All MAXIM suppliers must pass the qualification review before they can publish their DS12887A devices; we pay more attention to the channels and quality of DS12887A products than any other customer. We strictly implement supplier audits, so you can purchase with confidence.
Q: How to find the detailed information of DS12887A chips? Including MAXIM original factory information, Clock/Timing - Real Time Clocks EPROM application, DS12887A pictures?
You can use Jotrin's intelligent search engine, or filter by Timekeeping & Real-Time Clocks category, or find it through Maxim Integrated Information page.
Q: Are the MAXIM's DS12887A price and stock displayed on the platform accurate?
The MAXIM's inventory fluctuates greatly and cannot be updated in time, it will be updated periodically within 24 hours. After submitting an order for DS12887A, it is recommended to confirm the order with Jotrin salesperson or online customer service before payment.
Q: Can I place an order offline?
Yes. We accept offline orders.
We can provide order placement service. You only need to log in, click "My Orders" to enter the transaction management, and you will see the "Order Details" interface. After checking it, select all and click "Place Order". In addition, you can enjoy coupons or other selected gifts when placing orders online.
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Customers can choose industry-leading freight companies, including DHL, FedEx, UPS, TNT, and Registered Mail.
Once your order has been processed for shipment, our sales will send you an e-mail advising you of the shipping status and tracking number.
Note: It may take up to 24 hours before carriers will display tracking information. In normal conditions, Express delivery needs 3-5 days, Registered Mail needs 25-60 days.
Q: What is the process for returns or replacement of DS12887A?
All goods will implement Pre-Shipment Inspection (PSI), selected at random from all batches of your order to do a systematic inspection before arranging the shipment. If there is something wrong with the DS12887A we delivered, we will accept the replacement or return of the DS12887A only when all of the below conditions are fulfilled:
(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.
(2)We are informed of the defect described above within 90 days after the delivery of DS12887A.
(3)The DS12887A is unused and only in the original unpacked packaging.
Two processes to return the products:
(1)Inform us within 90 days
(2)Obtain Requesting Return Authorizations
More details about return electronic components please see our Return & Change Policy.
Q: How to contact us and get support, such as DS12887A datasheet pdf, DS12887 pin diagram?
Need any After-Sales service, please feel free contact us: sales@jotrin.com

Maxim Integrated

Maxim
Maxim Integrated Products is a global range of linearity, mixed-signal integrated circuits (IC) design, R & D and manufacturing leader, has designed, developed, and manufactured analog, mixed-signal, high-frequency, and digital circuits that enable all four of these key interactions....
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