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Status
Part Number	Status	Replacement	Explanation
DS1689	Active: In Production. But some versions of the family are No Longer Available. See Ordering Information.	DS1685	There is no direct replacement.
DS1693	This product is No Longer Available. See Ordering Information for recommended replacements.	DS1687	There is no direct replacement.

Data Sheet

FULL DATA SHEET (PDF, 600kB) Download   E-Mail

Description

The DS1689/DS1693 is a real time clock (RTC) designed as a successor to the industry standard DS1285, DS1385, DS1485, and DS1585 PC real time clocks. This device provides the industry standard DS1285 clock function with the new feature of either +3.0 or +5.0V operation and automatic backup and write protection to an external SRAM. The DS1689 also incorporates a number of enhanced features including a silicon serial number, power-on/off control circuitry, and 114 bytes of user NVSRAM, power-on elapsed timer, and power cycle counter. Each DS1689/DS1693 is individually manufactured with a unique 64-bit serial number as well as an additional 64-bit customer specific ROM or serial number. The serial number is programmed and tested at Dallas to insure that no two devices are a like. The serial number can be used to electronically identify a system for purposes such as establishment of a network node address or for maintenance tracking. Blocks of available numbers from Dallas Semiconductor can be reserved by the customer. The serialized RTCs also incorporate power control circuitry, which allows the system to be powered on via an external stimulus, such as a keyboard or by a time and date (wake-up) alarm. The PWR output pin can be triggered by one or either of these events, and can be used to turn on an external power supply. The PWR pin is under software control, so that when a task is complete, the system power can then be shut down. The DS1689/DS1693 incorporates a power-on elapsed time counter, a power-on cycle counter, and a battery powered continuous counter. These three counters provide valuable information for maintenance and warranty requirements. Automatic backup and write protection for an external SRAM is provided through the VCCO and CEO pins. The lithium energy source used to permanently power the real time clock is also used to retain RAM data in the absence of VCC power through the VCCO pin. The chip enable output to RAM (CEO) is controlled during power transients to prevent data corruption. The DS1689 is a clock/calendar chip with the features described above. An external crystal and battery are the only components required to maintain time-of-day and memory status in the absence of power. The DS1693 incorporates the DS1689 chip, a 32.768 kHz crystal, and a lithium battery in a complete, self-contained timekeeping module. The entire unit is fully tested at Dallas Semiconductor such that a minimum of 10 years of timekeeping and data retention in the absence of VCC is guaranteed.

This product contains lithium-metal batteries. See applicable regulations for transport requirements for batteries in equipment.

Key Features

Incorporates industry standard DS1287 PC clock plus enhanced features: +3- or +5V operation 64-bit silicon serial number 64-bit customer specific ROM or additional serial number available Power control circuitry supports system power-on from date/time alarm or key closure Automatic battery backup and write protection to external SRAM Crystal select bit allows RTC to operate with 6pF or 12.5pF crystal 114 bytes user NV RAM Auxiliary battery input RAM clear input Century register 32kHz output for power management 32-bit VCC powered elapsed time counter 32-bit VBAT powered elapsed time counter 16-bit power cycle counter Compatible with existing BIOS for original DS1287 functions Available as IC (DS1689) or standalone module with embedded battery and crystal (DS1693) IC is available in industrial temperature version Timekeeping algorithm includes leap year compensation valid up to 2100 Underwriters Laboratories (UL®) Recognized

Diagram

Block Diagram

Application Notes

Application Note 58: Crystal Considerations with Dallas Real-Time Clocks (RTCs) - DS1689 Application Note 499: Using the Multiplex Bus RTC Extended Features - DS1689, DS1693 Application Note 504: Design Considerations for Dallas Semiconductor Real-Time Clocks - DS1689, DS1693 Application Note 505: Lithium Coin-Cell Batteries: Predicting an Application Lifetime - DS1689 Application Note 701: Using the DS32kHz with Dallas Real-Time Clocks - DS1689 Application Note 1145: Interface a Multiplexed-Bus Real-Time Clock to a µP With Separate Address and Data Buses - DS1689, DS1693 Application Note 3778: Problems and Solutions for Adjusting to Changes in Daylight Saving Time - DS1689, DS1693

Design Guides

Real-Time Clocks (PDF)

Reliability Reports

Reliability Report: DS1689.pdf DS1693.pdf 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: 1-16 of 16

DS1689	Notes	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1689	114 x 8 RAM		N/A	No Longer Available	DS1685 There is no direct replacement.	PDIP(W);28 pin;592.6 mm² Outline Drawing: 21-0044 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P28-3*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
DS1689S/T&R/			N/A	No Longer Available	DS1685S-5+	Land Pattern: Not Available	0°C to +70°C	See data sheet
DS1689S+T&R-W				Active		SOIC(W);28 pin;235 mm² Outline Drawing: 21-0251 (PDF) Land Pattern: 90-0255 (PDF) Use pkgcode/variation: F28+2*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1689S+W				Active		SOIC(W);28 pin;235 mm² Outline Drawing: 21-0251 (PDF) Land Pattern: 90-0255 (PDF) Use pkgcode/variation: F28+2*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1689SN+T&R-W				Active		SOIC(W);28 pin;235 mm² Outline Drawing: 21-0251 (PDF) Land Pattern: 90-0255 (PDF) Use pkgcode/variation: F28+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1689SN+W				Active		SOIC(W);28 pin;235 mm² Outline Drawing: 21-0251 (PDF) Land Pattern: 90-0255 (PDF) Use pkgcode/variation: F28+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1689SN			N/A	No Longer Available	DS1685SN-5+	SOIC(W);28 pin;235 mm² Outline Drawing: 21-0251 (PDF) Land Pattern: 90-0255 (PDF) Use pkgcode/variation: F28-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1689SN/T&R			N/A	No Longer Available	DS1685SN-5+	SOIC(W);28 pin;235 mm² Outline Drawing: 21-0251 (PDF) Land Pattern: 90-0255 (PDF) Use pkgcode/variation: F28-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1689S	114 x 8 RAM		N/A	No Longer Available	DS1685S-5+	SOIC(W);28 pin;235 mm² Outline Drawing: 21-0251 (PDF) Land Pattern: 90-0255 (PDF) Use pkgcode/variation: F28-2*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
DS1689S/T&R			N/A	No Longer Available	DS1685S-5+	SOIC(W);28 pin;235 mm² Outline Drawing: 21-0251 (PDF) Land Pattern: 90-0255 (PDF) Use pkgcode/variation: F28-2*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
DS1689S+			N/A	No Longer Available	DS1685S-5+	SOIC(W);28 pin;235 mm² Outline Drawing: 21-0251 (PDF) Land Pattern: 90-0255 (PDF) Use pkgcode/variation: F28+2*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1689S+T&R			N/A	No Longer Available	DS1685S-5+	SOIC(W);28 pin;235 mm² Outline Drawing: 21-0251 (PDF) Land Pattern: 90-0255 (PDF) Use pkgcode/variation: F28+2*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1689SN+			N/A	No Longer Available	DS1685SN-5+	SOIC(W);28 pin;235 mm² Outline Drawing: 21-0251 (PDF) Land Pattern: 90-0255 (PDF) Use pkgcode/variation: F28+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1689SN+T&R			N/A	No Longer Available	DS1685SN-5+	SOIC(W);28 pin;235 mm² Outline Drawing: 21-0251 (PDF) Land Pattern: 90-0255 (PDF) Use pkgcode/variation: F28+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1693	Notes	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1693	114 x 8 RAM		N/A	No Longer Available	DS1687 There is no direct replacement.	EDIP;28 pin;625.9 mm² Outline Drawing: 21-0241 (PDF) Land Pattern: Not Available Use pkgcode/variation: MDP28-2*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
DS1693+			N/A	No Longer Available	DS1687-5+	EDIP;28 pin;625.9 mm² Outline Drawing: 21-0241 (PDF) Land Pattern: Not Available Use pkgcode/variation: MDP28+2*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis

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