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Data Sheet

FULL DATA SHEET (PDF, 456kB) Download   E-Mail

Description

The DS1216 SmartWatch RAM and SmartWatch ROM sockets are 600-mil-wide DIP sockets with a built-in CMOS watch function, an NV RAM controller circuit, and an embedded lithium energy source. The sockets provide 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 SmartWatch ROM sockets use the embedded lithium source to maintain the time and date only. A key feature of the SmartWatch 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.

Key Features

Keeps Track of Hundredths of Seconds, Seconds, Minutes, Hours, Days, Date of the Month, Months, and Years Converts Standard 2k x 8 Up to 512k x 8 CMOS Static RAMs into Nonvolatile Memory Embedded Lithium Energy Cell Maintains Watch Information and Retains RAM Data Watch Function is Transparent to RAM Operation Month and Year Determine the Number of Days in Each Month; Leap-Year Compensation Valid Up to 2100 Lithium Energy Source is Electrically Disconnected to Retain Freshness Until Power is Applied for the First Time Proven Gas-Tight Socket Contacts Full ±10% Operating Range Operating Temperature Range: 0°C to +70°C Accuracy Better Than ±1 Minute/Month at +25°C Underwriters Laboratories (UL®) Recognized

Diagram

Typical Operating Circuit

Application Notes

Application Note 52: Using the Dallas Phantom Real-Time Clocks (RTCs) - DS1216, DS1216E, DS1216F Application Note 504: Design Considerations for Dallas Semiconductor Real-Time Clocks - DS1216 Application Note 505: Lithium Coin-Cell Batteries: Predicting an Application Lifetime - DS1216 Application Note 509: Using the SmartWatch/Phantom Clocks with a Microcontroller - DS1216

Evaluation Kits

none

Design Guides

Real-Time Clocks (PDF) System Timing & Control (PDF)

Reliability Reports

Request Reliability Report for: DS1216 DS1216B DS1216C DS1216D DS1216E DS1216F DS1216H Underwriters Laboratories (UL®) Recognized

Software/Models

none

Ordering Information
Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices: 1-6 of 6
DS1216B	Notes	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1216B	16k/64k RAM			0 pin; Use pkgcode/variation: MDS28-1*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
DS1216C	Notes	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1216C	64k/256k RAM			0 pin; Use pkgcode/variation: MDS28-1*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
DS1216D	Notes	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1216D	256k/1M RAM			0 pin; Use pkgcode/variation: MDS32-1*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
DS1216E	Notes	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1216E	64k/256k ROM			0 pin; Use pkgcode/variation: MDS28-1*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
DS1216F	Notes	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1216F	64k/256k/1M ROM, 5V			0 pin; Use pkgcode/variation: MDS32-1*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
DS1216H	Notes	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1216H	4M RAM, 5V			0 pin; Use pkgcode/variation: MDS32-1*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis

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