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Name: DS1687-5+
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS1687-5+
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Any Feature, including a modified Existing Feature, that is not an Existing Feature.

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Analog Devices Inc./Maxim Integrated DS1687-5+

Part No.:: DS1687-5+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Package:: 24-DIP Module (0.600, 15.24mm)

Datasheet:: DS1687-5+.pdf

Description:: IC RTC CLK/CALENDAR PAR 24-EDIP

In Stock:: 8726

Quantity:: Add To Cart

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DS1687-5+ Typical application Circuitry

DS1687-5+

The DS1687-5+ is a real-time clock (RTC) chip designed by Maxim Integrated, featuring a built-in microprocessor-compatible real-time clock/calendar and 114 bytes of NV SRAM. This device is specifically designed for applications requiring accurate timekeeping under microprocessor control, alongside nonvolatile storage for critical data that must be preserved during power loss. The "+5" in its model number indicates that it is designed to operate at 5V power supply levels.

Key Features and Parameters:

- Integrated Real-Time Clock/Calendar: Tracks time in hours, minutes, and seconds, and the date in terms of day, month, and year.

- Nonvolatile (NV) SRAM: 114 bytes of NV SRAM for data storage that remains preserved when the main power is off, thanks to an onboard lithium battery.

- Microprocessor Interface: Compatible with most microprocessors through an easy-to-use parallel interface.

- Programmable Alarm: Can be set to generate an interrupt signal at a specified time/date, useful for scheduling future actions.

- Automatic Leap Year Compensation: Ensures accurate calendar computation up to the year 2100 without manual adjustments.

Application Scenario: Incorporating the DS1687-5+ in an industrial control system to maintain accurate timekeeping for logging events and retaining critical operational parameters across power cycles.

Circuit Design:

Designing an industrial control system with the DS1687-5+ involves specific connections:

1. Power Supply Connection:

- VCC (Pin 24): Connect to a +5V power supply. Use decoupling capacitors near the VCC pin to ensure a stable power supply, crucial for maintaining accurate timekeeping.

2. Ground Connection:

- GND (Pin 12): Connect to the system ground. A solid ground connection is vital for device stability and reliable operation.

3. Data Bus Interface:

- D0 to D7 (Pins 13-20): Interface these pins with the data bus of the industrial control system's microcontroller. This setup enables bidirectional data flow for reading/writing time and user data.

4. Address and Control Signals:

- AS (Address Strobe, Pin 23), READ (Pin 22), WRITE (Pin 21): Control these signals from the microcontroller to manage data access and storage operations. Proper timing and sequencing are crucial for accurate data transactions.

5. Alarm and Interrupt Output:

- IRQ (Interrupt Request, Pin 9): Connect this pin to an interrupt input on the microcontroller. Configure alarms to use the IRQ for event scheduling or notifications.

Design Considerations:

- Battery Backup: Ensure the lithium battery is properly connected and has sufficient charge to maintain time and data during power loss. Regularly monitor battery status for reliability.

- EMI Protection: In industrial settings, implement measures to shield the DS1687-5+ and associated data lines from electromagnetic interference, which could disrupt timekeeping and data integrity.

- Firmware Integration: Develop firmware for the microcontroller that accurately manages the interaction with the DS1687-5+, including setting the clock/calendar, reading the time/date, and utilizing the alarm function.

- Power Supply Stability: Use decoupling capacitors and ensure a clean power supply to the DS1687-5+ to avoid inaccuracies in timekeeping due to power fluctuations.

- Environmental Conditions: Given the industrial application, consider the operating temperature range and potential exposure to harsh conditions, ensuring the DS1687-5+'s placement and any protective measures align with environmental requirements.

By incorporating the DS1687-5+ into an industrial control system, designers can leverage its accurate timekeeping and nonvolatile storage capabilities to enhance event logging and maintain critical system parameters, ensuring operational continuity and efficiency. This application demonstrates the DS1687-5+'s utility in complex systems where time synchronization and data retention are paramount.

DS1687-5+ information

DS1687-5+ Specifications

Package/Case:
24-DIP Module (0.600, 15.24mm)
Packaging:
Tube
Series:
-
ProductStatus:
Active
Type:
Clock/Calendar
Features:
Alarm, NVSRAM, Square Wave Output, Y2K
MemorySize:
242B
TimeFormat:
HH:MM:SS (12/24 hr)
DateFormat:
YY-MM-DD-dd
Interface:
Parallel
Voltage-Supply:
4.5V ~ 5.5V
Voltage-SupplyBattery:
2.5V ~ 3.7V
Current-Timekeeping(Max):
3mA @ 5V
OperatingTemperature:
0°C ~ 70°C
MountingType:
Through Hole

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6. What is the process for return or replacement of DS1687-5+?

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(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.

(2)We are informed of the defect described above within 90 days after the delivery of DS1687-5+.

(3)The PartNo is unused and only in the original unpacked packaging.

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(1)Inform us within 90 days

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