Overview
IEC/TR 60828:1988 - Pin allocations for microprocessor systems using the IEC 603-2 connector - provides technical guidance for allocating power and ground connections in microprocessor-based systems that utilize the IEC 603-2 connector. This standard focuses on ensuring reliable performance by defining the minimum requirements for d.c. ground terminals, recommending best practices, and outlining restrictions for pin usage on both printed circuit boards and backplane connections.
IEC/TR 60828:1988 is essential for engineers and designers working with modular microprocessor systems, helping ensure system integrity, compatibility, and safety when using IEC 603-2 connectors in electronics applications.
Key Topics
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Minimum Ground Requirements:
- Mandates a minimum of four d.c. ground terminals per IEC 603-2 connector in microprocessor systems for proper operation and grounding integrity.
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Pin Allocation Guidelines:
- Specific pins (e.g., la, lb, lc, 32a, 32b, 32c) should be connected to ground or left unused.
- Designated pins (2a, 2b, 2c, 31a, 31b, 31c) are reserved for connection to the main d.c. power rail with a voltage not exceeding 5.0V ±10%, or can remain unused.
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Signal Return Path Considerations:
- Stresses the importance of additional signal return paths beyond basic ground pin requirements for supporting high-speed, non-differential bus structures.
- Recommends distributing return paths among signal connectors to minimize impedance discontinuities and improve bus performance.
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Applicability:
- The requirements cover both connector usage on printed circuit boards and system backplanes, facilitating consistent design across different components within microprocessor-based architectures.
Applications
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Microprocessor System Design:
- Facilitates reliable interconnection of modules and components in digital systems such as industrial controllers, embedded platforms, and communication hardware.
- Ensures the integrity of signal transmission and power delivery in modular and rack-mounted systems.
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Printed Circuit Board (PCB) and Backplane Integration:
- Provides a clear basis for designers to allocate pins for power and ground, which is critical for stability and minimizes signal interference.
- Assists in achieving proper grounding and power distribution in both individual boards and multi-board systems.
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System Reliability and Compatibility:
- Helps avoid common pitfalls such as insufficient grounding or improper pin assignments, reducing the risk of noise, data corruption, or hardware failure.
- Promotes interoperability among microprocessor boards manufactured to the IEC 603-2 connector standard, supporting international best practices.
Related Standards
- IEC 603-2: Connectors for frequencies below 3 MHz for use with printed boards - Part 2: Two-part connectors for printed boards with a basic grid of 2.54 mm. IEC/TR 60828 is directly based on pin allocation for this type of connector.
- IEC 60050: International Electrotechnical Vocabulary (IEV), for terminology consistency.
- IEC 60027: Letter symbols to be used in electrical technology.
- IEC 60417: Graphical symbols for use on equipment.
- IEC 60617: Graphical symbols for diagrams.
For engineers and technical professionals designing microprocessor-based systems requiring IEC 603-2 connectors, following IEC/TR 60828:1988 helps standardize power and ground pin assignments and supports higher system reliability across international applications.