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Data Sheet

FULL DATA SHEET (PDF, 616kB) Download   E-Mail

Description

The DS1386 is a nonvolatile static RAM with a full-function real-time clock (RTC), alarm, watchdog timer, and interval timer that are all accessible in a byte-wide format. The DS1386 contains a lithium energy source and a quartz crystal, which eliminates the need for any external circuitry. Data contained within 8k or 32k by 8-bit memory and the timekeeping registers can be read or written in the same manner as byte-wide static RAM. The timekeeping registers are located in the first 14 bytes of memory space. Data is maintained in the RAMified timekeeper by intelligent control circuitry, which detects the status of VCC and write protects memory when VCC is out of tolerance. The lithium energy source can maintain data and real time for over ten years in the absence of VCC. Timekeeper information includes hundredths of seconds, seconds, minutes, hours, day, date, month, and year. The date at the end of the month is automatically adjusted for months with less than 31 days, including correction for leap year. The RAMified timekeeper operates in either 24- hour or 12-hour format with an AM/PM indicator. The watchdog timer provides alarm interrupts and interval timing between 0.01 seconds and 99.99 seconds. The real-time alarm provides for preset times of up to one week. Interrupts for both watchdog and RTC operate when the system is powered down. Either can provide system "wakeup” signals.

Key Features

8kB or 32kB of User NV RAM Integrated NV SRAM, Real-Time Clock, Crystal, Power-Fail Control Circuit, and Lithium Energy Source Totally Nonvolatile With Over 10 Years of Operation in the Absence of Power Watchdog Timer Restarts an Out-Of-Control Processor Alarm Function Schedules Real-Time Related Activities such as System Wakeup Programmable Interrupts and Square-Wave Output All Registers are Individually Addressable via the Address and Data Bus Interrupt Signals are Active in Power-Down Mode

Application Notes

Application Note 66: Watchdog Timekeeper - DS1386 Application Note 504: Design Considerations for Dallas Semiconductor Real-Time Clocks - DS1386 Application Note 505: Lithium Coin-Cell Batteries: Predicting an Application Lifetime - DS1386 Application Note 507: PowerCap Package Allows for Density Upgrades, Surface Mount Assembly - DS1386

Evaluation Kits

none

Design Guides

REAL-TIME CLOCKS (PDF)

Reliability Reports

Reliability Report: DS1386.pdf DS1386P.pdf

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
DS1386	Notes	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1386-8-120	8k x 8 RAM, 120ns			MOD;32 pin; Dwg: 56-G0002-001 Use pkgcode/variation: MDT32-1*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
DS1386-32-120	32k x 8 RAM, 120ns			MOD;32 pin; Dwg: 56-G0002-001 Use pkgcode/variation: MDT32-1*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
DS1386-32-120+				MOD;32 pin; Dwg: 56-G0002-001 Use pkgcode/variation: MDT32+1*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1386-8-120+				MOD;32 pin; Dwg: 56-G0002-001 Use pkgcode/variation: MDT32+1*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1386P	Notes	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1386P-8-120	120ns			PWRCP;34 pin; Dwg: 56-G0003-001 Use pkgcode/variation: PC2-2*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
DS1386P-32-120+				PWRCP;34 pin; Dwg: 56-G0003-001 Use pkgcode/variation: PC2+2*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis

More Information

Real-Time Clock Design Guide (PDF) Other Watchdog Clocks

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