(China (Mainland))
Product Summary
The DS1216D SmartWatch RAM and SmartWatch ROM Socket is a 600mil-wide DIP socket with a built-in CMOS watch function, an NV RAM controller circuit, and an embedded lithium energy source. The DS1216D provides an NV RAM solution for memory sized from 2k x 8 to 512k x 8 with package sizes from 26 pins to 32 pins. When a socket is mated with a CMOS SRAM, it provides a complete solution to problems associated with memory volatility and uses a common energy source to maintain time and date. The DS1216D uses the embedded lithium source to maintain the time and date only. A key feature of the DS1216D is that the watch function remains transparent to the RAM. The SmartWatch monitors VCC for an out-of-tolerance condition. When such a condition occurs, an internal lithium energy source is automatically switched on and write protection is unconditionally enabled to prevent loss of watch and RAM data.
Parametrics
DS1216D absolute maximum ratings: (1)Voltage Range on any Pin Relative to Ground: -0.3V to +7.0V for 5V; (2)Operating Temperature Range: 0℃ to +70℃; (3)Storage Temperature Range: -40℃ to +70℃.
Features
DS1216D features: (1)Keeps track of hundredths of seconds, seconds, minutes, hours, days, date of the month, months, and years; (2)Converts standard 2k x 8 up to 512k x 8 CMOS static RAMs into nonvolatile memory; (3)Embedded lithium energy cell maintains watch information and retains RAM data; (4)Watch function is transparent to RAM operation; (5)Month and year determine the number of days in each month; leap-year compensation valid up to 2100; (6)Lithium energy source is electrically disconnected to retain freshness until power is applied for the first time; (7)Proven gas-tight socket contacts; (8)Full ±10% operating range; (9)Operating temperature range: 0℃ to +70℃; (10)Accuracy is better than ±1 minute/month @ +25℃.
Diagrams
| Image | Part No | Mfg | Description |  |
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 DS1216D |
Maxim Integrated Products |
Memory Controllers SmartWatch RAM |
Data Sheet |
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