• Daily Deals
  • Sell
  • Customer Support


Picture Information

Image not available
Mouse over to Zoom
Click to enlarge
Have one to sell? Sell it yourself

Details about  New DS1687 DS1687-5 5V Real-Time Clock 9936b2 112227

New DS1687 DS1687-5 5V Real-Time Clock 9936b2 112227
Top Rated Plus
  • Sellers with highest buyer ratings
  • Returns, money back
  • Ships in a business day with tracking
Learn more

Seller information

99.9% Positive feedback
Visit store:

Item Information

Item condition:
Error icon
More than 10 available / 60 sold
Please enter a quantity of $qty_dummy$ or less Please enter a quantity of 1 Purchases are limited to $qty_dummy$ per buyer Please enter quantity of 1 or more Please enter a lower number Choose quantity that is less than $qty_dummy1$ or equal to $qty_dummy$ You can only choose quantity that is equal to $qty_dummy$
Original priceUS $5.00 What does this price mean?
What does this price mean?
This is the price (excluding shipping and handling fees) this seller has provided at which the seller has sold the same item, or one that is virtually identical to it, in the recent past. The "off" amount and percentage simply signifies the calculated difference between the seller-provided original price for the item and the seller's current discounted price. If you have any questions related to the pricing and/or discount offered in a particular listing, please contact the seller for that listing.
You save:
$0.50 (10% off)
Sale ends in 1 day
Discounted price US $4.50
Best Offer:
Make Offer
Resume making your offer, if the page does not update immediately.
4 watchers
Best offer available
Free shipping
60 sold
BillMeLater New customers get $10 back on 1st purchase
Subject to credit approval.
See terms - opens in a new window or tab
FREE Expedited Shipping | See details
Item location:
Houston, Texas, United States
Ships to:
United States and many other countries | See details
Between Thu. Jul. 24 and Mon. Jul. 28 to 20147 Estimated by eBay FAST 'N FREE  help icon for Estimated delivery date - opens a layer
PayPal , Bill Me Later  |  See payment details
International shipping and import charges paid to Pitney Bowes Inc. Learn More- opens in a new window or tab
14 days money back or item exchange, buyer pays return shipping See details
 | See details - opens in a new window or tab
Get the item you ordered or get your money back.
Covers your purchase price and original shipping.
Add to cart to save with this special offer
If you Buy It Now, you'll only be purchasing this item. If you'd like to get the additional items you've selected to qualify for this offer, close this window and add these items to your cart.
add items to cart image
eBay item number:
Seller assumes all responsibility for this listing.
Last updated on  Oct 15, 2013 11:18:01 PDT  View all revisions

Item specifics

New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is ... Read moreabout the condition


Visit my eBay store  

Stock Photo used



Incorporates Industry-Standard DS1287 PC Clock

plus Enhanced Features Such as: Y2K Compliant

+3V or +5V Operation

64-Bit Silicon Serial Number

Power-Control Circuitry Supports System

Power-On from Date/Time Alarm or Key


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

Underwriters Laboratory (UL) Recognized


Embedded Systems

Utility Meters

Security Systems

Network Hubs, Bridges, and Routers





The DS1685/DS1687 are real-time clocks (RTC) 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 Maxim such that a minimum of 10 years of timekeeping and data retention in

the absence of VCC is guaranteed

Tax - SALES TAX is applicable to buyers in Texas.
Freight - Unless otherwise stated in the item description freight and insurance will be ground service, prepaid and added to your bid total. We will ship within 1-3 business days upon confirmed receipt of payment depending on the item, weight and destination. Rook Systems Group ships within the United States and to Canada only, please allow for delivery within 3-10 business days. If you wish to have your items shipped 2nd day or 3rd day please contact us for a quote. Packaging will meet or exceed insurance minimum requirements. 

Communication - Hours are Monday through Friday 9:00 A.M to 5:00 P.M CST.

Returns - Claims for damaged product must be reported to Rook Systems Group within 48 hours of receipt. You must contact customer service for a Return Merchandise Authorization number (RMA) before returning product. A 20% restocking fee will be charged on any return without an RMA number, as well as returns for buyer's remorse, abuse or refusal to take delivery.  Contact customer service via email in the event that a product fails within the warranty period. Exchanges require proper authorization.  Items not received by Rook Systems Group within 7 days of the RMA issue date will not be accepted. Refunds/exchanges are subject to availability of similar products.

Questions and answers about this item

No questions or answers have been posted about this item.

Seller assumes all responsibility for this listing.

Shipping and handling

Item location: Houston, Texas, United States
Shipping to: United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech Republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, Korea, South, Indonesia, Taiwan, South Africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi Arabia, Ukraine, United Arab Emirates, Qatar, Kuwait, Bahrain, Croatia, Republic of, Malaysia, Turkey
Estimated sales tax
Seller charges sales tax for items shipped to: TX*(8.25%).
* Tax applies to subtotal + S&H for these states only

Return policy

After receiving the item, contact seller within
Refund will be given as
Return shipping
14 days
Money back or item exchange (buyer's choice)
Buyer pays return shipping

Payment details

Payment method Preferred / Accepted  
Credit or debit card through PayPal
Bill Me Later
time left
Current bid amount
Shipping amount
Bid Count
time left
current bid
Current bid amount Approximately:
Shipping amount Approximately:
Import charges:
Import charges:
(estimated and based on max bid)
Your bid amount


Your current max bid:
Increase your chances of winning by setting a higher bid now.
Let eBay place automatic bids for you  This opens an help overlay dialog about automatic bidding.
How does automatic bidding work?
As other bids come in, eBay will automatically raise your bid in small amounts, up to your limit. Learn More. - opens in a new window or tab
Close button. This closes the help overlay dialog.
, up to
By submitting your bid, you'll be committing to buy this item from the seller if you are the winning bidder.
By submitting your bid, you are committing to buy this item from the seller if you are the winning bidder. You have read and agree to the Global Shipping Program terms and conditions - opens in a new window or tab. Import charges previously quoted are subject to change if you increase you maximum bid amount.
By clicking Confirm, you commit to buy this item from the seller if you are the winning bidder.
By clicking Confirm, you are committing to buy this item from the seller if you are the winning bidder and have read and agree to the Global Shipping Program terms and conditions - opens in a new window or tab. Import charges previously quoted are subject to change if you increase you maximum bid amount.
Tell us what you think 
We've made a few changes to bidding.
Were these helpful?
Bid layer is updating the contents.
Resume bidding, if the page does not update immediately.
FREE shipping
See item description
(Enter ##1## or more)
(Enter more than ##1##)
Your max bid:
You've been outbid. Don't let it get away - place another bid.
You've been outbid by an automatic bid placed earlier by another bidder.
You're the highest bidder on this item!
You're the first bidder on this item!
You're the highest bidder on this item, but you're close to being outbid.
This auction is almost over and you're currently the high bidder.
You're the high bidder on this item, but the reserve price hasn't been met yet.
You've been outbid by someone else.
You can still win! Try bidding again.
You've been outbid by someone else's max bid.
You can still win! Try bidding again.
Your bid wasn't accepted because it's the same as someone else's bid.
Try raising your max bid.
You're the highest bidder!
To increase your chances of winning, try raising your bid.
You're the first bidder. Good Luck!
You're still the highest bidder!
You increased your max bid to
Please enter your bid again.
Enter a valid amount for your bid.
Enter a bid that is the minimum bid amount or higher.
You have to bid at least
Sorry, you can't lower your maximum bid once it's placed.
This seller requires the buyer to have a PayPal account to purchase this item. Get a PayPal account here .
Your bid is the same as or more than the Buy It Now price.You can save time and money by buying it now.
Place bid
Review and confirm your bid
Bid confirmation
Increase max bid
Time left:
Current bid:
(approximately ##1##)
Your maximum bid:
(approximately ##1##)
Increase your maximum bid:
By clicking 1 Click Bid, you commit to buy this item from the seller if you're the winning bidder. Learn moreabout 1-click bid - opens in a new window or tab
(approximately ##1##)
Winning bid:
Starting bid:
Congrats! The auction has ended and you're the winner.
The auction has ended, but the reserve price was not met.
Sorry, the auction has ended and you were outbid.
Good news, you're the high bidder.
Sorry, you've been outbid.
You're the high bidder, but the reserve price is not met.
Please enter a higher amount than the current bid.
Maximum bids cannot be lowered once submitted.
Please enter a valid number.