DS12885QN+ by Analog Devices

Real-Time Clocks


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$6.93

Distributor Stock
Logo for Farnell
Farnell
from US$6.93
54
in stock
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Logo for Newark Electronics
Newark Electronics
from US$8.49
54
in stock
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Logo for element14
element14
from US$7.46
54
in stock
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Features

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

Specifications

Interface Multiplexed
VSUPPLY (V) 5
Date/ Time Format (hh = sec/100) YY-MM-DD/ HH:MM:SS
Time Keeping Current (nA) (typ) 225
CL (pF) 6
Memory Type NV SRAM
Memory Size (Bytes) 114
Time of Day Alarms 1
Package/Pins PDIP/24PLCC/28SOIC (W)/24TQFP/32
BudgetaryPrice (See Notes) 4.29


DS12885QN+ Semiconductors - ICs by Analog Devices

RTC W/ NVSRAM 912B HH:MM:SS PLCC-28

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

Specifications

Date Format Day
Clock Format HH
Clock IC Type Alarm RTC
Supply Voltage Min 4.5V
Supply Voltage Max 5.5V
Clock IC Case Style PLCC
No. of Pins 28Pins
IC Interface Type Multiplexed
Operating Temperature Min -40°C
Operating Temperature Max 85°C
Product Range -
Automotive Qualification Standard -
RoHS Phthalates Compliant To Be Advised
MSL MSL 1 - Unlimited
SVHC No SVHC (15-Jan-2018)

Alternative Descriptions

Rtc W/ Nvsram, 912B, Hh:Mm:Ss, Plcc-28 | Newark Electronics
RTC W/ NVSRAM, 912B, HH:MM:SS, PLCC-28 | element14
RTC W/ NVSRAM, 912B, HH: MM: SS, PLCC-28 | Farnell

Frequently Asked Questions

Where can I find additional details, specifications and documents for a DS12885QN+ ?

Additional datasheets, footprints and schematics for DS12885QN+ are listed on our Part Details page. You can also find images and similar parts to DS12885QN+ on this page.

What pricing and inventory information can I view?

Distributor pricing and stock information is available for DS12885QN+ on our Product Comparison page. Access via the 'View Pricing & Stock' button to view DS12885QN+ price breaks, MOQs, lead times, inventory and SKUs from distributors.

Who can I contact for technical support of the product?

Submit any questions directly to the customer support team of the distributor listing the product. For the DS12885QN+ you can contact the distributor directly for product support, shipping queries etc.

Is the DS12885QN+ RoHS compliant?

This part has not been flagged as RoHS Compliant.

Which authorised distributors for DS12885QN+ have stock available?

Authorised distributors including Newark Electronics, element14 and Farnell have stock available or on a lead time for DS12885QN+ .

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