DS12887+ by Analog Devices

Real-Time Clocks

Status: Active
Series: DS12887, DS12887A
RoHS: Unknown
Download Datasheet Visit Manufacturer Site View Pricing & Stock

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 battery-backed static RAM (113 bytes in the DS12C887 and DS12C887A). The DS12887 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.

Where to Buy

Prices starting from US$7.51

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from US$9.00
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from US$9.96
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Newark Electronics
from US$9.67
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from US$9.36
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Analog Devices
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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


Interface Multiplexed
Date/ Time Format (hh = sec/100) YY-MM-DD/ HH:MM:SS
Memory Type NV SRAM
Memory Size (Bytes) 114
Time of Day Alarms 1
Integrated Resonator XTAL
Package/Pins MOD/24
BudgetaryPrice (See Notes) 6.37

DS12887+ Semiconductors - ICs by Analog Devices

IC RTC 12887 DIP24

Status: Unknown
Series: -
RoHS: Unknown
Download Datasheet Visit Manufacturer Site View Pricing & Stock


Date Format Day
Clock Format 12Hr / 24Hr
Clock IC Type RTC
Supply Voltage Min 4.5V
Supply Voltage Max 5.5V
Clock IC Case Style DIP
No. of Pins 24Pins
IC Interface Type Multiplexed
Operating Temperature Min 0°C
Operating Temperature Max 70°C
Product Range -
Automotive Qualification Standard -
RoHS Phthalates Compliant To Be Advised
SVHC 1 2-dimethoxyethane ethylene glycol dimethyl ether (EGDME) (15-Jan-2018)
Base Number 12887
Device Marking DS12887+
IC Case Style DIP
IC Generic Number 12887
IC Temperature Range Commercial
Interrupt Type Time of day Periodic Update In Progress
Logic Function Number 12887
Memory Type RAM
No. of Outputs 8Outputs
Operating Temperature Range 0°C to +70°C
RTC Features Periodic Interrupt Square-Wave Output
Supply Voltage Range 4.5V to 5.5V
Termination Type Through Hole
Voltage Vcc Max 5V

Alternative Descriptions

IC, RTC, 12887, DIP24 | element14
Real Time Clock, 4.5-5.5V, Edip-24 | Newark Electronics
Real-Time Clocks | Analog Devices
RTC Mu.plex Bus UL no RCLR EDIP24 | Schukat Electronic

Frequently Asked Questions

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Is the DS12887+ RoHS compliant?

This part has not been flagged as RoHS Compliant.

Which authorised distributors for DS12887+ have stock available?

Authorised distributors including element14, Newark Electronics, Farnell, Analog Devices and Micros have stock available or on a lead time for DS12887+ .

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