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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 are Resident in the Eight Top RAM Locations..
● Totally Nonvolatile with Over 10 Years of Operation in the Absence of Power
● 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
● DS1644 Only (DIP Module)
Upward Compatible with the DS1643 Timekeeping RAM to Achieve Higher RAM Density
Standard JEDEC Bytewide 32k x 8 Static RAM Pinout
● DS1644P 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
Underwriters Laboratory (UL) Recognized
DESCRIPTION
The DS1644 is a 32k x 8 nonvolatile static RAM with a full function real time clock, which are both accessible in a byte-wide format.The nonvolatile timekeeping RAM is functionally equivalent to any JEDEC standard 32k x 8 SRAM. The device can also be easily substituted for ROM, EPROM and EEPROM, 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 DS1644 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.
Preview of the first 3 pages of the data sheet
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10000 buyer reviews from United States
Patricia Miller
Length of registration:7 years
I recently ordered an IC SFH6343 from your company and I am very pleased with its performance. The IC is reliable and efficient, and it has been working great in my project. It is easy to use and the instructions were clear and concise. I am very satisfied with the quality of the product and the customer service I received. Thank you for providing me with a great product and excellent customer ser
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03/17/2023
Harry Bauder
Length of registration:3 years
The packaging is exquisite, the high-end atmosphere is high-end, it can be seen that the merchants are very attentive. The baby is really good, it is the same as the picture, there is no difference, it is really good value for money, good quality and low price
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01/09/2023
Stephen Ballentine
Length of registration:3 years
I enjoyed learning how to use these. Fixed another broken project with it. Excellent quality, and it arrived in a protective tube designed to prevent damage.
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01/09/2023
Joe Ritch
Length of registration:3 years
The order is accepted, decorated and shipped quickly. Packing is good. Tracking works. Satisfied
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01/09/2023
Gordon C Whitten
Length of registration:3 years
The goods are received on time, until I checked, as I will check the feedback. The seller sent on time, everything came safe and sound.
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01/04/2023
Glenn Hann
Length of registration:3 years
rec'd chips; great packing for international shipping; thx for making small quantities available of these hard to find items!
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12/22/2022
Lammi
Length of registration:3 years
Fantastic customer support, my order arrived very fast and well packed. All around a fantastic experience and nice to have a place to buy lower quanties of hard to find chips.
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12/22/2022
Shawn Long
Length of registration:3 years
I enjoyed learning how to use these. Fixed another broken project with it. Excellent quality, and it arrived in a protective tube designed to prevent damage.
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12/19/2022
arturo solano
Length of registration:3 years
I received the parts swift and well packed. Thanks for the great service.
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12/19/2022
John Hernandez
Length of registration:3 years
I enjoyed learning how to use these. Fixed another broken project with it. Excellent quality, and it arrived in a protective tube designed to prevent damage.
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12/19/2022
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DS1644-120+
DS1644-120+ has several brands around the world that may have alternate names for DS1644-120+ due to regional differences or acquisition. DS1644-120+ may also be known as the following names:
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Unit Price:8.27680
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Stop production experts, we can provide a large number of electronic components that have been stopped production and are difficult to find, to facilitate the maintenance company
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