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Analog Devices Inc./Maxim Integrated DS1245Y-70IND+

Part No.:: DS1245Y-70IND+

Manufacturer:: Analog Devices Inc./Maxim Integrated

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

Datasheet:: DS1245Y-70IND+.pdf

Description:: IC NVSRAM 1MBIT PARALLEL 32EDIP

In Stock:: 242

Quantity:: Add To Cart

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DS1245Y-70IND+ Specifications

Package/Case:
32-DIP Module (0.600, 15.24mm)
Packaging:
Tube
Series:
-
ProductStatus:
Active
MemoryType:
Non-Volatile
MemoryFormat:
NVSRAM
Technology:
NVSRAM (Non-Volatile SRAM)
MemorySize:
1Mb (128K x 8)
MemoryInterface:
Parallel
ClockFrequency:
-
WriteCycleTime-WordPage:
70ns
AccessTime:
70 ns
Voltage-Supply:
4.5V ~ 5.5V
OperatingTemperature:
-40°C ~ 85°C (TA)
MountingType:
Through Hole

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DS1245Y-70IND+ information

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DS1245Y-70IND+ Typical application Circuitry

DS1245Y-70IND+

The DS1245Y-70IND+ is a high-capacity 1-Megabit Nonvolatile (NV) SRAM chip designed by Maxim Integrated. This chip integrates the speed and flexibility of SRAM with non-volatile data retention, thanks to an on-board battery. The "IND" designation indicates its suitability for industrial applications, with the "+" signifying an enhanced version, possibly with improvements in terms of reliability, data retention, or temperature tolerance. The "70" in its name suggests a 70 ns access time, making it fast enough for demanding applications that require quick data access alongside non-volatile storage capabilities.

Key Features and Parameters:

- 1-Megabit Capacity: Provides ample space for storing configuration data, logs, or any critical information that must be preserved during power loss.

- Nonvolatile Storage: Ensures data is retained for over 10 years without power, thanks to its integrated lithium battery.

- Fast Access Time: 70 ns access time allows for quick reads and writes, essential for high-performance industrial applications.

- Industrial Temperature Range: Operates reliably in a wide temperature range, suitable for harsh industrial environments.

- Unlimited Read/Write Cycles: Unlike flash memory, this NV SRAM supports an unlimited number of read/write operations, enhancing its lifespan and reliability.

Application Scenario: Implementing the DS1245Y-70IND+ in a programmable logic controller (PLC) for an automated manufacturing line, ensuring program and operational data integrity across power cycles.

Circuit Design:

Incorporating the DS1245Y-70IND+ into a PLC system involves detailed planning around its pin connections:

1. Power Supply Connection:

- VCC (Pin 32): Connect to the +5V power supply of the PLC. Utilize decoupling capacitors near VCC to stabilize the power supply, essential for reliable chip operation.

2. Ground Connection:

- GND (Pin 16): Connect to the system ground. Proper grounding is vital to minimize electrical noise and ensure stable operation.

3. Data Bus Interface:

- DQ0 to DQ7 (Pins 8-15): Interface these pins with the PLC's data bus for seamless data communication. Signal integrity on the data bus is critical for accurate data transfers.

4. Address Bus Connection:

- A0 to A18 (Pins 1-7, 17-31, and 33-34): Connect to the PLC's address bus to select specific memory locations. Precise addressing ensures correct data storage and retrieval.

5. Control Signals:

- WE (Write Enable, Pin 29), CE (Chip Enable, Pin 22), OE (Output Enable, Pin 24): Manage these signals for reading and writing operations. Accurate control of these signals is crucial for maintaining data integrity.

Design Considerations:

- Power Failure Management: Design circuitry to swiftly switch to battery backup during power failures, safeguarding data integrity.

- Battery Status: Plan for periodic checks of the battery's health and easy replacement, ensuring nonvolatile data retention capabilities are maintained.

- EMI Protection: In industrial settings, shield the memory and associated circuits from electromagnetic interference that could corrupt data.

- Access Timing Compatibility: Confirm that the system's timing matches the DS1245Y-70IND+'s access time to avoid data access delays.

- Data Integrity Mechanisms: Implement checksums or CRC checks within the PLC's firmware to ensure the integrity of data read from the NV SRAM.

By deploying the DS1245Y-70IND+ in a PLC for an automated manufacturing line, engineers can leverage its nonvolatile storage and fast access speed to enhance system reliability, ensuring critical program data is preserved across power interruptions. This application underscores the DS1245Y-70IND+'s role in industrial automation, highlighting its importance in improving operational efficiency and data security.

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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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