Quick Detail:
3V/5V Real-Time Clocks
Description:
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 Dallas Semiconductor such that a minimum of 10 years of timekeeping and data retention in the absence of VCC is guaranteed.
Applications:
Incorporates Industry-Standard DS1287 PC Clock plus Enhanced Features Such as: Y2K Compliant
ƒ +3V or +5V Operation
ƒ 64-Bit Silicon Serial Number
ƒ Power-Control Circuitry Supports System
Power-On from Date/Time Alarm or Key Closure
ƒ 32kHz Output for Power Management
ƒ Crystal-Select Bit Allows RTC to Operate with 6pF or 12.5pF Crystal
ƒ SMI Recovery Stack
ƒ 242 Bytes Battery-Backed NV RAM
ƒ Auxiliary Battery Input
ƒ RAM Clear Input
ƒ Century Register
ƒ Date Alarm Register
ƒ Compatible with Existing BIOS for Original DS1287 Functions
ƒ Available as Chip (DS1685) or Stand-Alone
Encapsulated DIP (EDIP) with Embedded
Battery and Crystal (DS1687)
ƒ Timekeeping Algorithm Includes Leap-Year
Compensation Valid Through 2099
ƒ Underwriters Laboratory (UL) Recognized
Specifications:
|
Datasheets |
DS1685, 87 |
|
Product Photos |
24-DIP-600mil Pkg |
|
Standard Package |
14 |
|
Category |
Integrated Circuits (ICs) |
|
Family |
Clock/Timing - Real Time Clocks |
|
Series |
- |
|
Packaging |
Tube |
|
Type |
Clock/Calendar |
|
Features |
Alarm, NVSRAM, Square Wave Output, Y2K |
|
Memory Size |
242B |
|
Time Format |
HH:MM:SS (12/24 hr) |
|
Date Format |
YY-MM-DD-dd |
|
Interface |
Parallel |
|
Voltage - Supply |
2.7 V ~ 3.7 V |
|
Voltage - Supply, Battery |
2.5 V ~ 3.7 V |
|
Operating Temperature |
-40°C ~ 85°C |
|
Mounting Type |
Through Hole |
|
Package / Case |
24-DIP Module (0.600", 15.24mm) |
|
Supplier Device Package |
24-EDIP |
Competitive Advantage:
Warranty :180 days !
Free shipping: Order over $1000 win a free shipment fee
(goods weight below 3Kg) ,during 20130901-20130930 .
Why buy from us >>> Fast / Safely / Conveniently
• SIERRA SUPERIOR ELECTRON LTD is a Stock keeper and trade company of Electronic components .Our branches office include China, Hong Kong, Sigapore , Canada . Offer business, service, resourcing and information for our global member.
• Goods are ensured the highest quality possible and are delivered to our customers all over the world with speed and precision.
How to buy >>>
• Contact us by email & sent your inquire with your Transport destination .
• Online chat, the commissioner would be responded ASAP.
Service >>>
• Forwarder Shipment to world-wide, DHL ,TNT ,UPS,FEDEX etc. buyer don`t need to worry about shipping problem
• We will try to respond as quickly as possible. But due to time zone difference, please allow up to 24 hours to get your mail replied. The products were tested by some devices or software, we ensure that there is no quality problems.
• We are committed to providing fast, convenient and safe transportation service to global buyer.