Products > Integrated Circuits (ICs) > Clock & Timer ICs > DS1643-100

Images are for reference only.


Hot Sale

Real Time Clock Parallel 8KByte

Manufacturer : MAXIM/DALLAS
Package/Case : DIP28
Product Categories : Clock/Timing - Real Time Clocks
Datasheet: DS1643-100 Datasheet (PDF)
RoHs Status: Lead free / RoHS Compliant
In-stock: 1913


Request for Quotation

Warm Tips: Please fill out the below form and we will contact you as soon as possible.

DS1643-100 Product Details

The DS1643-100 is a 8K x 8 nonvolatile static RAM with a full function Real Time Clock (RTC) which are both accessible in a byte-wide format. The nonvolatile timekeeping RAM is functionally equivalent to any JEDEC standard 8K x 8 SRAM. The device can also be easily substituted in ROM, EPROM and EEPROM sockets providing read/write nonvolatility and the addition of the real time clock function.



Integrated NV SRAM, real time clock, crystal, power-fail control circuit and lithium energy source
Clock registers are accessed identically to the static RAM. These registers are resident in the eight top RAM locations.
Totally nonvolatile with over 10 years of operation in the absence of power
Access times of 70 ns and 100 ns
BCD coded year, month, date, day, hours, minutes, and seconds with leap year compensation valid up to 2100
Power-fail write protection allows for ±10% VCC power supply tolerance
Lithium energy source is electrically disconnected to retain freshness until power is applied for the first time
DS1643 only (DIP Module)
– Standard JEDEC byte-wide 8K x 8 RAM pinout DS1643P only (PowerCap Module Board)
– Surface mountable package for direct connection to PowerCap containing battery and crystal
– Replaceable battery (PowerCap)
– Power-fail output
– Pin-for-pin compatible with other densities of DS164XP Timekeeping RAM

DS1643-100 Products

Technical Parameters

  • Function
  • Clock, Calendar, NV Timekeeping RAM
  • RTC Bus Interface
  • Parallel
  • Time Format
  • HH:MM:SS
  • RTC Memory Size
  • 8192 B
  • Supply Voltage Max
  • 5.5 V
  • Supply Voltage Min
  • 4.5 V
  • Maximum Operating Temperature
  • + 70 C
  • Minimum Operating Temperature
  • 0 C
  • Mounting Style
  • Through Hole
  • Package / Case
  • eDIP
  • Packaging
  • Bulk
  • Series
  • DS1643
  • Part # Aliases
  • 90-16430-100

DS1643-100 Equivalent Parts

For the DS1643-100 component, you may consider these replacement and alternative parts.

Models Manufacturer Package/Case Description

DS1643-100 Related Products

Ratings and Reviews (1)

  • 5 / 5
  • 5 Stars 100%
  • 4 Stars 0%
  • 3 Stars 0%
  • 2 Stars 0%
  • 1 Stars 0%
  • **THON***

    Top Ware, super schneller Versand. 4x5 Sterne. Bis zum nächsten mal, Danke+++

  • Ratings
  • Please rate the product!
Shipping More
Estimated Delivery Time: Jun 28 - Jul 03 days (choose Expedited at checkout).

Shipping & Payment


  • Shipping Type
  • Ship Fee
  • Lead Time
  • $20.00-$40.00 (0.50 KG)
  • 2-5 days
  • $20.00-$40.00 (0.50 KG)
  • 3-7 days
  • $20.00-$45.00 (0.50 KG)
  • 2-5 days
  • $25.00-$65.00 (0.50 KG)
  • 2-5 days
  • $25.00-$45.00 (0.50 KG)
  • 5-14 days
  • $2.00-$3.00 (0.10 KG)
  • 7-30 days

Processing Time:Shipping fee depend on different zone and country.


  • Terms of payment
  • Hand Fee
  • Payment Site
  • charge US$30.00 banking fee.
  • charge 4.0% service fee.
  • charge 3.5% service fee.
  • charge US$0.00 banking fee.
  • charge US$0.00 banking fee.

We provide high quality products, thoughtful service and after sale guarantee

  • We have rich products, can meet your various needs.

    We have rich products, can meet your various needs.

  • Minimum order quantity starts from 1pcs.

    Minimum order quantity starts from 1pcs.

  • Lowest international shipping fee starts from US$2.00.

    Lowest international shipping fee starts from US$2.00.

  • 90 days quality guarantee for all products.

    90 days quality guarantee for all products.


  • Step1:Product

    Step1: Products

  • Step2:Vacuum packaging

    Step2: Vacuum Packaging

  • Step3:Anti-static bag

    Step3: Anti-Static Bag

  • Step4:Individual packaging

    Step4: Individual Packaging

  • Step5:Packaging boxes

    Step5: Packaging Boxes

  • Step6:bar-code shipping tag

    Step6: Bar-Code Shipping Tag

All the products will packing in anti-staticbag. Ship with ESD antistatic protection.

Outside ESD packing’s lable will use ourcompany’s information: Part Mumber, Brand and Quantity.

We will inspect all the goods before shipment,ensure all the products at good condition and ensure the parts are new originalmatch datasheet.

After all the goods are ensure no problems afterpacking, we will packing safely and send by global express. It exhibitsexcellent puncture and tear resistance along with good seal integrity.

Jotrin ESD packing


1.The electronic components you purchase include 365 Days Warranty, We guarantee product quality.

2.If some of the items you received aren't of perfect quality, we would resiponsibly arrange your refund or replacement. But the items must remain their orginal condition.


Q: How does Jotrin guarantee that DS1643-100 is the original manufacturer or agent of MAXIM/DALLAS?
We have a professional business development department to strictly test and verify the qualifications of MAXIM/DALLAS original manufacturers and agents. All MAXIM/DALLAS suppliers must pass the qualification review before they can publish their DS1643-100 devices; we pay more attention to the channels and quality of DS1643-100 products than any other customer. We strictly implement supplier audits, so you can purchase with confidence.
Q: How to find the detailed information of DS1643-100 chips? Including MAXIM/DALLAS original factory information, Clock/Timing - Real Time Clocks application, DS1643-100 pictures?
You can use Jotrin's intelligent search engine, or filter by EPROM category, or find it through MAXIM/DALLAS brand manufacturer page.
Q: Are the MAXIM/DALLAS's DS1643-100 price and stock displayed on the platform accurate?
The MAXIM/DALLAS's inventory fluctuates greatly and cannot be updated in time, it will be updated periodically within 24 hours. After submitting an order for DS1643-100, it is recommended to confirm the order with Jotrin salesperson or online customer service before payment.
Q: Can I place an order offline?
Yes. We accept offline orders.
We can provide order placement service. You only need to log in, click "My Orders" to enter the transaction management, and you will see the "Order Details" interface. After checking it, select all and click "Place Order". In addition, you can enjoy coupons or other selected gifts when placing orders online.
Q: What forms of payment can I use in Jotrin?
TT Bank, Paypal, Credit Card, Western Union, and Escrow is all acceptable.
Q: How is the shipping arranged and track my package?
Customers can choose industry-leading freight companies, including DHL, FedEx, UPS, TNT, and Registered Mail.
Once your order has been processed for shipment, our sales will send you an e-mail advising you of the shipping status and tracking number.
Note: It may take up to 24 hours before carriers will display tracking information. In normal conditions, Express delivery needs 3-5 days, Registered Mail needs 25-60 days.
Q: What is the process for returns or replacement of DS1643-100?
All goods will implement Pre-Shipment Inspection (PSI), selected at random from all batches of your order to do a systematic inspection before arranging the shipment. If there is something wrong with the DS1643100 we delivered, we will accept the replacement or return of the DS1643-100 only when all of the below conditions are fulfilled:
(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.
(2)We are informed of the defect described above within 90 days after the delivery of DS1643-100.
(3)The DS1643-100 is unused and only in the original unpacked packaging.
Two processes to return the products:
(1)Inform us within 90 days
(2)Obtain Requesting Return Authorizations
More details about return electronic components please see our Return & Change Policy.
Q: How to contact us and get support, such as DS1643-100 datasheet pdf, DS1643 pin diagram?
Need any After-Sales service, please feel free contact us:

Popular Electronic Parts

  • DS1629S+
    DS1629S+ Digital Thermometer and Real-Time Clock/Calendar,Board Mount Temperatu...
  • DS1642-100+
    DS1642-100+ Nonvolatile Timekeeping RAM,NVRAM IC RAM TIMEKEEP NV 100NS
  • DS1631A
    DS1631A High-Precision Digital Thermometer and Thermostat
  • DS1629S
    DS1629S Digital Thermometer and Real-Time Clock/Calendar
  • DS1629
    DS1629 2-Wire Digital Thermometer and Real Time Clock2
  • DS1642-100

Certificates & Honor

Certificates & Honor