DS1687-3+ by Analog Devices

3V/5V Real-Time Clock


The DS1685/DS1687 are real-time clocks (RTCs) designed as successors to the industry-standard DS1285,DS1385, DS1485, and DS1585 PC RTCs. These devices provide the industry-standard DS1285 clock function with either +3.0V or +5.0V operation. The DS1685 also incorporates a number of enhanced features including a silicon serial number, power-on/off control circuitry, 242 bytes of user NV SRAM, and 32.768kHz output for sustaining power management activities. The DS1685/DS1687 power-control circuitry allows the system to be powered on by an external stimulus such as a keyboard or by a time and date (wake-up) alarm. The PWR output pin can be triggered by one or either of these events, and can be used to turn on an external power supply. The PWR pin is under software control, so that when a task is complete, the system power can then be shut down. The DS1685 is a clock/calendar chip with the features described above. An external crystal and battery are the only components required to maintain time-of-day and memory status in the absence of power. The DS1687 incorporates the DS1685 chip, a 32.768kHz crystal, and a lithium battery in a complete, self-contained timekeeping EDIP. The entire unit is fully tested at Dallas Semiconductor such that a minimum of 10 years of timekeeping and data retention in the absence of VCC is guaranteed.

Where to Buy

Prices starting from US$11.15

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RS
from US$13.43
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in stock
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Analog Devices
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element14
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Features

Y2K Compliant
+3V or +5V Operation
64-Bit Silicon Serial Number
Power-Control Circuitry Supports System Power-On from Date/Time Alarm or Key Closure
32kHz Output for Power Management
Crystal-Select Bit Allows RTC to Operate with 6pF or 12.5pF Crystal
SMI Recovery Stack
242 Bytes Battery-Backed NV RAM
Auxiliary Battery Input
RAM Clear Input
Century Register
Date Alarm Register
Compatible with Existing BIOS for Original DS1287 Functions
Available as Chip (DS1685) or Stand-Alone Encapsulated DIP (EDIP) with Embedded Battery and Crystal (DS1687)
Timekeeping Algorithm Includes Leap-Year Compensation Valid Through 2099

Specifications

Interface Multiplexed
VSUPPLY (V) 35
Date/ Time Format (hh = sec/100) YYYY-MM-DD/ HH:MM:SS
Memory Type NV SRAM
Memory Size (Bytes) 242
Time of Day Alarms 1
Package/Pins MOD/24
BudgetaryPrice (See Notes) 9.13


DS1687-3+ Semiconductors - ICs by Analog Devices

RTC W/ NV SRAM 242BYTE EDIP-24

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 2.7V
Supply Voltage Max 3.7V
Clock IC Case Style EDIP
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
MSL MSL 1 - Unlimited
SVHC 1 2-dimethoxyethane ethylene glycol dimethyl ether (EGDME) (15-Jan-2018)

Alternative Descriptions

3V/5V Real-Time Clock | Analog Devices
DS1687-3+,Real Time Clock | RS
RTC W/ NV SRAM, 242BYTE, EDIP-24 | Farnell
Rtc W/ Nv Sram, 242Byte, Edip-24 | Newark Electronics

Frequently Asked Questions

Where can I find additional details, specifications and documents for a DS1687-3+ ?

Additional datasheets, footprints and schematics for DS1687-3+ are listed on our Part Details page. You can also find images and similar parts to DS1687-3+ on this page.

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Is the DS1687-3+ RoHS compliant?

This part has not been flagged as RoHS Compliant.

Which authorised distributors for DS1687-3+ have stock available?

Authorised distributors including Analog Devices, RS, element14, Farnell and Newark Electronics have stock available or on a lead time for DS1687-3+ .

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