3 Volt/5 Volt Serialized Real-Time Clock with NV RAM Control

Part Number	Status	Replacement	Explanation
DS1688	This product is No Longer Available. See Ordering Information for recommended replacements.	DS1685 DS17285 DS17485 DS17885	There is no direct replacement. The DS17x85 has 2K, 4K, and 8K bytes extended RAM.
DS1691	This product is No Longer Available. See Ordering Information for recommended replacements.	DS1685 DS17285 DS17485 DS17885	There is no direct replacement. The DS17x85 has 2K, 4K, and 8K bytes extended RAM.

The DS1688/DS1691 is a real-time clock (RTC) designed as a successor to the industry standard DS1285, DS1385, DS1485, and DS1585 PC real time clocks. This device provides the industry standard DS1285 clock function with the new feature of either +3.0 or +5.0V operation and automatic backup and write protection to an external SRAM. The DS1688 also incorporates a number of enhanced features including a silicon serial number, power on/off control circuitry, 114 bytes of user NV SRAM, power on elapsed timer, and power cycle counter.

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