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Product Detailed Parameters
- Description：82C55 - CMOS PROGRAMMABLE PERIPH
- Series：*
- Mfr：Harris Corporation
- Package：Bulk
- Features：-
- Number of Channels：-
- FIFO's：-
- Protocol：-
- Data Rate (Max)：-
- Voltage - Supply：-
- With Auto Flow Control：-
- With IrDA Encoder/Decoder：-
- With False Start Bit Detection：-
- With Modem Control：-
- Mounting Type：-
- Package / Case：-
- Supplier Device Package：-
- Grade：-
- Qualification：-
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Overview
The Harris IS82C55A-596 is a high-performance CMOS Programmable Peripheral Interface (PPI) derived from the industry-standard NMOS 8255A. Manufactured using a self-aligned silicon gate CMOS process, it provides 24 programmable I/O pins organized into two groups of 12. The device supports three major modes of operation and features direct bit set/reset capability. It operates with a maximum clock frequency of 8 MHz and maintains full TTL compatibility over the extended temperature range. The component ensures low standby power consumption while offering drive capabilities suitable for various microprocessor systems.
Feature Summary
- Pin-compatible design with the NMOS 8255A standard
- High-speed operation without wait states at frequencies up to 8 MHz
- Low standby power consumption characteristic of static CMOS design
- TTL compatibility across the full military temperature range
Applications
- General-purpose programmable I/O expansion for microprocessor systems
- Interfacing with 80C86 and 80C88 microprocessors
- Industrial control applications requiring robust I/O management
Procurement Notes
Verify the specific suffix -596 against official Harris or Intersil documentation to confirm exact electrical characteristics and package options. Ensure the selected variant meets the required operating temperature range and voltage specifications for the target application environment before finalizing procurement.
Selection Notes
Select this component when a CMOS upgrade to the 8255A is required for lower power consumption and higher speed. Confirm that the system requires 24 I/O lines and compatible logic levels. Verify package availability in DIP or PLCC formats based on board layout constraints and mounting requirements.
Part Context
The IS82C55A belongs to the 82C55 family of programmable peripheral interfaces produced by Harris Corporation and later Intersil/Renesas. This family serves as a CMOS alternative to the legacy NMOS 8255A, offering improved performance metrics while maintaining functional equivalence and pinout compatibility for seamless integration into existing designs.
Replacement Considerations
The Intel 82C55A and Harris CD82C55A are functionally equivalent replacements. These parts share the same pinout and operational modes, allowing for direct substitution in designs originally utilizing the NMOS 8255A.
