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Analog Devices Inc./Maxim Integrated DS1747W-120IND+

Part No.:: DS1747W-120IND+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Package:: 32-DIP Module (0.600, 15.24mm)

Datasheet:: DS1747W-120IND+.pdf

Description:: IC RTC CLK/CALENDAR PAR 32-EDIP

In Stock:: 210

Quantity:: Add To Cart

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DS1747W-120IND+ Specifications

Package/Case:
32-DIP Module (0.600, 15.24mm)
Packaging:
Tube
Series:
-
ProductStatus:
Active
Type:
Clock/Calendar
Features:
Leap Year, NVSRAM, Y2K
MemorySize:
512KB
TimeFormat:
HH:MM:SS (24 hr)
DateFormat:
YY-MM-DD-dd
Interface:
Parallel
Voltage-Supply:
2.97V ~ 3.63V
Voltage-SupplyBattery:
-
Current-Timekeeping(Max):
2mA @ 3.3V
OperatingTemperature:
-40°C ~ 85°C
MountingType:
Through Hole

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DS1747W-120IND+ information

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DS1747W-120IND+ Typical application Circuitry

DS1747W-120IND-

The DS1747W-120IND+ is a high-capacity, nonvolatile (NV) timekeeping RAM designed by Maxim Integrated. It integrates a full-featured real-time clock/calendar (RTC), 512K x 8 nonvolatile static RAM, a programmable alarm, and a watch function into a single package. The device is specifically engineered for applications requiring reliable data and timekeeping across power loss without the need for an external battery. The "IND" suffix indicates its suitability for industrial applications, with the "+" denoting an enhanced version of the standard model. The "120" typically refers to the access time in nanoseconds.

Key Features and Parameters:

- Integrated Real-Time Clock/Calendar: Maintains accurate time and date, including leap year correction.

- 512K x 8 Nonvolatile Static RAM: Provides significant data storage with NV characteristics, ensuring data retention without power.

- Programmable Alarm and Watchdog Timer: Enables scheduling of events and monitoring of system operations.

- Wide Operating Temperature Range: Suitable for industrial applications (-40°C to +85°C).

- Low Power Consumption: Designed for energy efficiency, particularly important in battery-backed or power-sensitive applications.

Application Scenario: Implementing the DS1747W-120IND+ in an industrial automation control system to maintain accurate timekeeping, log operational data, and ensure system configuration is preserved during power failures.

Circuit Design:

Designing an industrial automation control system with the DS1747W-120IND+ involves careful planning around its pin connections:

1. Power Supply Connection:

- VCC (Pin 32): Connect to the system's +3.3V or +5V power supply (as compatible). Place decoupling capacitors close to VCC to ensure a stable supply, crucial for the device's operation.

2. Ground Connection:

- GND (Pin 16): Connect to the system's ground. Solid grounding is essential for minimizing electrical noise.

3. Real-Time Clock and Control Interface:

- AS (Address Strobe, Pin 23), READ (Pin 22), WRITE (Pin 21): Interface these control signals with the system's microcontroller or CPU to manage RTC settings and data transactions. Proper timing and control are crucial for synchronizing data access.

4. Data Bus Interface:

- DQ0 to DQ7 (Pins 8-15): Connect to the data bus of the industrial system's microcontroller or CPU for bidirectional data communication. Ensuring data integrity is vital for reliable system operation.

5. Address Bus Connection:

- A0 to A15 (Various Pins): Route these pins to the address bus for accessing specific memory locations within the NV SRAM. Precise address decoding is key to proper data storage and retrieval.

6. Alarm and Interrupts:

- INTB (Interrupt Output, Pin 9): Connect to an interrupt input on the microcontroller to utilize the programmable alarm function for event scheduling. Effective use of interrupts enhances system responsiveness.

Design Considerations:

- Power Management: Ensure seamless switchover to backup power to maintain RTC and data integrity during primary power loss.

- Environmental Robustness: Given the industrial setting, protect the DS1747W-120IND+ from extreme temperatures, dust, and moisture.

- EMI Mitigation: Employ shielding and layout strategies to minimize electromagnetic interference, particularly in noisy industrial environments.

- Firmware Integration: Develop firmware for the microcontroller that efficiently manages RTC settings, data logging, and alarm functionalities, enabling dynamic system adjustments.

- Data Backup and Recovery: Implement procedures for regular data backup and establish a recovery protocol to protect and restore operational parameters and logs.

By deploying the DS1747W-120IND+ in an industrial automation control system, engineers can leverage its integrated RTC and NV RAM to enhance system reliability, ensuring accurate timekeeping and data retention across power interruptions. This application underscores the DS1747W-120IND+'s utility in industrial settings, where maintaining operational continuity and data integrity is paramount.

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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.

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