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Utsource certified used parts
Utsource certified used parts provide the following guarantees:
1. Utsource will inspect the goods, including appearance inspection (no serious damage to the appearance), select qualified and honest suppliers, and ensure 98% qualification rate.
2. Some parts are tested by machine.
3. Utsource certified parts can be returned and refunded unconditionally within 60 days.
Description
IC RTC CLK/CALENDAR PAR 28-EDIP
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FEATURES
● 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 Reside in the Eight Top RAM Locations.
● Totally Nonvolatile with Over 10 Years of Operation in the Absence of Power
● Access Times of 70ns and 100ns
● 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
● UL Recognized
● DS1643P Only (PowerCap Module Board) Surface Mountable Package for Direct
Connection to Power Cap Containing
Battery and Crystal
Replaceable Battery (Power Cap)
Power-Fail Output
Pin-for-Pin Compatible with Other Densities of DS164XP Timekeeping RAM
DESCRIPTION
The DS1643 is an 8K x 8 nonvolatile static RAM with a full function Real Time Clock (RTC) that 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. The real time clock information resides in the eight uppermost RAM locations. The RTC registers contain year, month, date, day, hours, minutes, and seconds data in 24-hour BCD format. Corrections for the day of the month and leap year are made automatically. The RTC clock registers are double-buffered to avoid access of incorrect data that can occur during clock update cycles. The double-buffered system also prevents time loss as the timekeeping countdown continues unabated by access to time register data. The DS1643 also contains its own power-fail circuitry, which deselects the device when the VCC supply is in an out of tolerance condition. This feature prevents loss of data from unpredictable system operation brought on by low VCC as errant access and update cycles are avoided.
PACKAGES
The DS1643 is available in two packages: 28-pin DIP module and 34-pin Power Cap module. The 28-pin DIP style module integrates the crystal, lithium energy source, and silicon all in one package. The 34-pin Power Cap Module Board is designed with contacts for connection to a separate Power Cap (DS9034PCX) that contains the crystal and battery. This design allows the Power Cap to be mounted on top of the DS1643P after the completion of the surface mount process. Mounting the Power Cap after the surface mount process prevents damage to the crystal and battery due to high temperatures required for solder reflow. The Power Cap is keyed to prevent reverse insertion. The Power Cap Module Board and Power Cap are ordered separately and shipped in separate containers. The part number for the Power Cap is DS9034PCX.
CLOCK OPERATIONS—READING THE CLOCK
While the double-buffered register structure reduces the chance of reading incorrect data, internal updates to the DS1643 clock registers should be halted before clock data is read to prevent reading of data in transition. However, halting the internal clock register updating process does not affect clock accuracy. Updating is halted when a one is written into the read bit, the seventh most significant bit in the control register. As long as a 1 remains in that position, updating is halted. After a halt is issued, the registers reflect the count, that is day, date, and time that was current at the moment the halt command was issued. However, the internal clock registers of the double-buffered system continue to update so that the clock accuracy is not affected by the access of data. All of the DS1643 registers are updated simultaneously after the clock status is reset. Updating is within a second after the read bit is written to 0.
Preview of the first 3 pages of the data sheet
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241 buyer reviews from United Kingdom
Jamie
Length of registration:3 years
All working fine, great quality! Fast shipment and great price! Totally recommended!
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12/07/2022
FOUNDRY ARIENTE SA
Length of registration:15 years
Thank you very much to the seller all delivered on time and the goods correspond to the description. Measured some, and are within the standard.
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11/11/2022
Paul
Length of registration:13 years
The things I bought are very satisfactory and practical
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10/17/2022
phil simmons
Length of registration:9 years
nice components
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10/17/2017
John Connolly
Length of registration:9 years
High quality components and excellent fast service.
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01/09/2017
Lance Welsh
Length of registration:11 years
Excellent service
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12/29/2016
Neil Walkley
Length of registration:8 years
Received in good condition
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11/30/2016
C.B.Ashmore
Length of registration:7 years
Excellent service, may thanks
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11/24/2016
Gary Beddows
Length of registration:7 years
Fantastic
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09/19/2016
Robert
Length of registration:7 years
Excellent really pleased i have now repaired my Pioneer av receiver. Many Thanks You guys. Don,t listen to the lies on the net. great service and people. Robert
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09/13/2016
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DS1643-100+
DS1643-100+ has several brands around the world that may have alternate names for DS1643-100+ due to regional differences or acquisition. DS1643-100+ may also be known as the following names:
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