Product Summary

The DS1642-100 is a 2K x 8 nonvolatile static RAM and a full-function real time clock which are both accessible in a bytewide format. The nonvolatile time keeping RAM is pin- and function-equivalent to any JEDEC standard 2K 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.

Parametrics

DS1642-100 absolute maximum ratings: (1)Voltage on Any Pin Relative to Ground: –0.3V to +7.0V; (2)Operating Temperature: 0℃ to 70℃; (3)Storage Temperature: –20℃ to +70℃; (4)Soldering Temperature: 260℃ for 10 seconds (See Note 6).

Features

DS1642-100 features: (1)Integrated NV SRAM, real time clock, crystal, power fail control circuit and lithium energy source; (2)Standard JEDEC bytewide 2K x 8 static RAM pinout; (3)Clock registers are accessed identically to the static RAM. These registers are resident in the eight top RAM locations; (4)Totally nonvolatile with over 10 years of operation in the absence of power; (5)Access times of 70 ns and 100 n.

Diagrams

DS1642-100 BLOCK DIAGRAM 

Image Part No Mfg Description Data Sheet Download Pricing
(USD)		 Quantity
DS1642-100
DS1642-100
Maxim Integrated Products
Real Time Clock NV Timekeeping RAM
Data Sheet
Negotiable 
DS1642-100+
DS1642-100+
Maxim Integrated Products
Real Time Clock NV Timekeeping RAM
Data Sheet
0-1: $16.22
1-25: $10.90
25-50: $7.90
50-100: $7.80