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DS1643-100+

Nonvolatile Timekeeping RAM

4 sellers list DS1643-100+

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Product Details DS1643-100+

1. Description

> The DS1643 is an 8K x 8 nonvolatile static RAM with a full function Real Time Clock (RTC) that areboth accessible in a byte-wide format. The nonvolatile timekeeping RAM is functionally equivalent toany JEDEC standard 8K x 8 SRAM. The device can also be easily substituted in ROM, EPROM andEEPROM sockets providing read/write nonvolatility and the addition of the real time clock function. Thereal time clock information resides in the eight uppermost RAM locations. The RTC registers containyear, month, date, day, hours, minutes, and seconds data in 24-hour BCD format. Corrections for the dayof the month and leap year are made automatically. The RTC clock registers are double-buffered toavoid access of incorrect data that can occur during clock update cycles. The double-buffered system alsoprevents time loss as the timekeeping countdown continues unabated by access to time register data. TheDS1643 also contains its own power-fail circuitry, which deselects the device when the VCCsupply is inan out of tolerance condition. This feature prevents loss of data from unpredictable system operationbrought on by low VCCas errant access and update cycles are avoided.


2. Features 

> Clock Registers are Accessed Identically to theStatic RAM. These Registers Reside in theEight Top RAM Locations.

> Totally Nonvolatile with Over 10 Years ofOperation in the Absence of Power.

Lithium Energy Source is ElectricallyDisconnected to Retain Freshness Until Poweris Applied for the First Time.


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