DS12C887

Images are for reference only

DS12C887

IC RTC CLK/CALENDAR PAR 24EDIP

  • Manufacturer
  • Mfr. Part #DS12C887
  • Package
  • Datasheet
  • In Stock3843

100% Original & New

24 Hours ready to ship

365 Days Warranty

RFQ & Get more Discounts

Specifications

Part Status Obsolete
DigiKey Programmable Not Verified
Type Clock/Calendar
Features Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output
Memory Size 113B
Time Format HH:MM:SS (12/24 hr)
Date Format YY-MM-DD-dd
Interface Parallel
Voltage - Supply 4.5V ~ 5.5V
Voltage - Supply, Battery 2.5V ~ 4V
Current - Timekeeping (Max) 15mA @ 4.5V ~ 5.5V
Operating Temperature 0°C ~ 70°C
Mounting Type Through Hole
Package / Case 24-DIP Module (0.600", 15.24mm)
Supplier Device Package 24-EDIP
Base Product Number DS12C887

Overview

Description

DS12C887 is a CMOS Real-Time Clock/Calendar with nonvolatile RAM from Dallas Semiconductor (Maxim). It provides continuous timekeeping and data storage for PCs and embedded systems.
Key features:
- Real-time clock/calendar: seconds, minutes, hours, day of week, date, month, year (with optional century bit)
- Alarm and programmable periodic interrupt outputs
- 64 bytes of nonvolatile RAM for user data/configuration
- Battery-backed operation to keep time and NVRAM during power loss
- PC-compatible parallel-access interface (address/data bus with control signals), usable as a drop-in replacement for RTC/NVRAM in BIOS/ISA-era designs and many embedded applications
- Typical supply: 4.5–5.5V
Use cases:
- BIOS/system timekeeping
- Event counters and scheduled interrupts
- Small data logging or configuration storage in power-fied environments
Note: implementation details (bus protocol, register map) are designed to resemble other Dallas/Maxim RTCs (e.g., DS1287) for easy migration.

Features

DS12C887 Features (concise)
- Real-time clock/calendar with 32.768 kHz crystal input; 12/24-hour mode; BCD time/date data with leap-year support.
- 56 bytes of nonvolatile RAM (NV RAM) battery-backed for user data.
- Two programmable alarms with multiple matching modes.
- Interrupt outputs for alarms and RTC updates; configurable IRQ/SQW outputs.
- Programmable square-wave output with selectable frequencies.
- Trickle-charge input to maintain backup power (battery or capacitor) during power loss.
- Power-fail detect and automatic switchover to backup supply.
- DC supply compatible with common logic levels; suitable for microcontroller interfaces.
- Wide feature set suitable for PC/embedded RTC and data logging tasks.

Package

DS12C887 uses a 28‑pin package, available in DIP‑28 and PLCC‑28 variants.

Pinout

- Pin count: 28-pin package (DIP/SOIC)
- Function: Real-Time Clock/Calendar with non-volatile RAM. Provides timekeeping (seconds, minutes, hours, day, date, month, year, century), alarms, timer, and battery-backed RAM, commonly interfaced to system timekeeping hardware (PC RTC style).

Manufacturer

Dallas Semiconductor Corporation. It was an American semiconductor company that designed and manufactured integrated circuits (including real-time clocks, memory, and microcontrollers). It was acquired by Maxim Integrated (and is now part of Analog Devices).

Application

DS12C887 is a CMOS real-time clock/calendar with 56 bytes RAM and alarm/interrupts, battery-backed for timekeeping during power loss. Applications:
- PC motherboard BIOS timekeeping
- Embedded systems needing calendar, alarms, and periodic interrupts
- Data logging and event timestamping
- Industrial automation and process control
- Consumer electronics and appliances
- Telecommunications equipment
- Any low-power RTC needs.

Equivalent

Common equivalents to DS12C887:
- DS1287 (and DS12887) – Dallas/Maxim RTC with NVRAM
- DS12C887A – updated revision of the DS12C887
Alternative RTC+RAM families (functional substitutes):
- ST M48T02, M48T08 (timekeeper RAM)
Note: exact pinout/interfaces vary; verify compatibility for your design.

Shipping

Shipping MethodsWe

offer global shipping services through DHL, FedEx, TNT, UPS, or any other forwarder of your choice.


Shipping Fee Reference (DHL/FedEx):

DHL: Shipping cost ranges from $25-$45 (0.5kg), with an estimated delivery time of 2-5 business days.

FedEx: Shipping cost ranges from $25-$40 (0.5kg), with an estimated delivery time of 3-7 business days.

UPS: Shipping cost ranges from $25-$45 (0.5kg), with an estimated delivery time of 3-7 business days.

TNT: Shipping cost ranges from $25-$65 (0.5kg), with an estimated delivery time of 3-7 business days.

EMS: Shipping cost ranges from $30-$50 (0.5kg), with an estimated delivery time of 7-15 business days.

Registered Air Mail: Shipping cost is $2-$4 (0.1kg), with an estimated delivery time of 5-20 business days.

Payments

Payment Methods

The Payment term is 100% Prepaid.

Currently, we only accept the below payment methods:

1. PayPal

2. Credit/ Debit Card

3. Wire Transfer

Similar