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Analog Devices Inc./Maxim Integrated DS1687-5IND+

Part No.:: DS1687-5IND+

Manufacturer:: Analog Devices Inc./Maxim Integrated

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

Datasheet:: DS1687-5IND+.pdf

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

In Stock:: 3921

Quantity:: Add To Cart

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DS1687-5IND+ 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:
-40°C ~ 85°C
MountingType:
Through Hole

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DS1687-5IND+ information

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DS1687-5IND+ Typical application Circuitry

DS1687-5IND+

The DS1687-5IND+ is an integrated Real-Time Clock (RTC) and non-volatile (NV) SRAM controller designed by Maxim Integrated. It is specifically engineered for applications that demand accurate timekeeping and data retention across power cycles, making it an invaluable component in environments where reliability is crucial. The "IND" suffix indicates that this variant is suited for industrial applications, capable of operating under wider temperature ranges and harsher conditions.

Key Features and Parameters:

- Accurate Timekeeping: Features a built-in crystal oscillator that ensures precise time measurement.

- Non-Volatile SRAM: Offers built-in NV SRAM for data retention without external power, safeguarding critical information during power outages.

- Battery Backup: Includes an integrated battery input for continuous operation, even when external power is lost.

- Industrial Temperature Range: Operates across -40°C to +85°C, suitable for challenging industrial environments.

- Serial Interface: Allows for easy configuration and data access, facilitating integration with a wide array of microcontrollers and processors.

Application Scenario – Industrial Control Systems:

In industrial control systems, the DS1687-5IND+ can serve as a critical component for logging events, maintaining system time, and preserving configuration settings during power failures.

Circuit Design Details:

1. Power Supply and Backup:

- VCC (Pin 24): Connect to a stable 5V power source. Place a 0.1µF decoupling capacitor close to this pin to ensure clean power delivery.

- VBACK (Pin 20): Attach to an external battery to maintain clock and SRAM operation during power loss. A diode in series with the battery prevents reverse charging.

2. Memory and Timekeeping Interface:

- Data Lines (D0-D7, Pins 1-8): These bidirectional pins should be connected to the data bus of the primary microcontroller for data read/write operations.

- Address Lines (A0-A12, scattered across various pins): Connect to the microcontroller's address outputs to select specific memory locations within the SRAM for operations.

3. Control Signals for Operation:

- Read (RD, Pin 22) and Write (WR, Pin 23): Active-low signals that control the direction of data flow. These should be tied to the corresponding control outputs on the microcontroller.

- Chip Enable (CE, Pin 26): An active-low pin that, when pulled low, enables the DS1687-5IND+ for operation, connecting it to a control line from the microcontroller.

4. Timekeeping Accuracy:

- Oscillator Connections (X1 and X2, Pins 15 and 16): Connect a 32.768 kHz crystal across these pins. Select capacitors for the crystal load as specified by the manufacturer to ensure the accuracy of the RTC.

5. Alarm and Interrupts:

- Interrupt Request (IRQ, Pin 13): Utilize this output to signal the microcontroller about alarms or periodic timekeeping events, connecting it to an interrupt input on the microcontroller.

Design Considerations:

- EMI Protection: Industrial environments can be rich in electromagnetic interference. Shielding and careful PCB layout can mitigate potential disruptions to the DS1687-5IND+'s operations.

- Battery Selection and Lifecycle: Choose a battery with a proven track record in industrial applications. Monitor the battery's voltage to anticipate replacement needs.

- Thermal Management: Despite the DS1687-5IND+'s industrial rating, consider passive cooling solutions if the chip is located near heat-generating components.

- Firmware Integration: Develop firmware that effectively leverages the DS1687-5IND+'s features, such as utilizing alarms for task scheduling or handling interrupts for event-driven actions.

- Signal Integrity: For the data and address buses, adhere to best practices in trace routing and termination to preserve signal integrity, especially in noisy industrial environments.

Employing the DS1687-5IND+ in an industrial control system scenario highlights its robustness and reliability in maintaining operational continuity and data integrity, ensuring accurate timekeeping and data preservation across challenging conditions. This application underscores the DS1687-5IND+'s value in enhancing the resilience and functionality of critical industrial systems.

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

All goods will implement Pre-Shipment Inspection (PSI), selected at random from all batches of your order to do a systematic inspection before arranging the shipment. If there is something wrong with the DS1687-5IND+ we delivered, we will accept the replacement or return of the DS1687-5IND+ only when all of the below conditions are fulfilled:

(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 DS1687-5IND+.

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

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(1)Inform us within 90 days

(2)Obtain Requesting Return Authorizations