Product Summary

The DS1646-120 is a 128k x 8 nonvolatile static RAM with a full-function real time clock, which are both accessible in a byte-wide format. The DS1646-120 can be easily substituted for ROM, EPROM and EEPROM, providing read/write nonvolatility and the addition of the real time clock function. The DS1646-120 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.

Parametrics

DS1646-120 absolute maximum ratings: (1)Voltage Range on Any Pin Relative to Ground: -0.3V to +6.0V; (2)Storage Temperature Range EDIP: -40 to +85℃; PowerCap: -55 to +125℃; (3)Lead Temperature (soldering, 10s): +260℃; (4)Soldering Temperature (reflow, PowerCap): +260℃.

Features

DS1646-120 features: (1)Integrates NV SRAM, Real-Time Clock, Crystal, Power-Fail Control Circuit and Lithium Energy Source; (2)Clock Registers are Accessed Identically to the Static RAM. These Registers are Resident in the Eight Top RAM Locations; (3)Totally Nonvolatile with Over 10 Years of Operation in the Absence of Power; (4)BCD-Coded Year, Month, Date, Day, Hours, Minutes, and Seconds with Leap Year Compensation Valid Up to 2100; (5)Power-Fail Write Protection Allows for ±10% VCC Power Supply Tolerance; (6)Replaceable Battery (PowerCap); (7)Power-Fail Output; (8)Pin-for-Pin Compatible with Other Densities of DS164xP Timekeeping RAM; (9)Underwriters Laboratories (UL) Recognized.

Diagrams

Image Part No Mfg Description Data Sheet Download Pricing
(USD)		 Quantity
DS1646-120
DS1646-120
Maxim Integrated Products
Real Time Clock
Data Sheet
Negotiable 
DS1646-120+
DS1646-120+
Maxim Integrated Products
Real Time Clock NV Timekeeping RAM
Data Sheet
0-1: $27.85
1-25: $18.70
25-50: $13.55
50-100: $13.39