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Renesas CS82C55A96
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- Part No.:
- CS82C55A96
- Manufacturer:
- Renesas
- Category:
- I/O Expanders
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
CS82C55A96.pdf
- Description:
- IC XPNDR PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,391
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Product details
Overview
CS82C55A96 from Intersil is a CMOS Programmable Peripheral Interface IC designed for parallel I/O expansion in 8-bit microprocessor systems such as 80C86/80C88. It provides 24 programmable I/O pins across three 8-bit ports (A, B, C), supports three operational modes (Mode 0–2), features direct bit set/reset on Port C, and delivers 2.5mA drive capability per I/O line with 10µA standby current.
For engineers reviewing the CS82C55A96 datasheet, CS82C55A96 pinout, CS82C55A96 application, or CS82C55A96 equivalent, key selection criteria include TTL compatibility across military temperature range, bus-hold circuitry eliminating external pull-ups, no-wait-state operation at 5MHz/8MHz, and programmable strobed/bidirectional I/O for legacy embedded control interfaces.
Technical Context
The CS82C55A96 implements a dual-group control architecture: Group A manages Port A and upper Port C (PC7–PC4); Group B manages Port B and lower Port C (PC3–PC0). Each group accepts software-defined control words to configure mode (0/1/2), direction, and interrupt enable (INTE) via bit set/reset on designated PC lines.
Its static CMOS design enables low-power operation while maintaining full TTL voltage-level compatibility. Bus-hold circuitry on all I/O ports actively maintains logic states during high-impedance conditions-eliminating need for external termination-and supports reliable operation from –40°C to +85°C in PLCC-44 packaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency | Up to 8MHz - enables zero-wait-state interfacing with 80C86/80C88 CPUs without timing penalties. |
| I/O Drive Capability | ±2.5mA per pin - sufficient to directly drive Darlington arrays or high-voltage LED displays without buffer stages. |
| Standby Current (ICCSB) | 10µA - minimizes power in idle or sleep states for battery-sensitive industrial controllers. |
| Temperature Range | –40°C to +85°C - qualified for extended industrial environments without derating. |
| Bus-Hold Circuitry | Integrated on all ports - holds floating inputs at valid logic levels, removing requirement for external pull-up/pull-down resistors. |
| Port Configuration Flexibility | Three independent 8-bit ports with software-selectable Mode 0/1/2 - allows mixed strobed input, bidirectional bus, and basic I/O on same device. |
| Control Word Readback | Enhanced read capability with D7 = 1 indicating control register access - simplifies runtime configuration verification and debug. |
Pinout & Package
CS82C55A96 is supplied in a 44-lead Plastic Leaded Chip Carrier (PLCC) package, RoHS-compliant with matte tin terminations, suitable for reflow soldering per IPC/JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power Supply | +5V supply rail; requires local 0.1µF decoupling capacitor to GND for noise suppression. |
| GND | Ground Reference | System ground return path; must be low-impedance connection to minimize switching noise coupling. |
| D0–D7 | Bidirectional Data Bus | Three-state interface to CPU data bus; transfers control words, status, and I/O data under RD/WR control. |
| CS | Chip Select | Active-low enable; asserts internal logic only when low, isolating device from bus contention. |
| RD / WR | Read/Write Control | Active-low signals coordinating data flow direction and register selection with A0/A1 addressing. |
| A0 / A1 | Port Address Select | Decode which register (Port A/B/C or control word) is accessed during RD/WR cycles. |
| RESET | Hardware Initialization | Active-high signal clearing control register to 9Bh and setting all ports to input mode with bus-hold active. |
| PA0–PA7 | Port A I/O | 8-bit bidirectional port with bus-hold on both high and low states; supports latched input/output in all modes. |
| PB0–PB7 | Port B I/O | 8-bit bidirectional port with bus-hold high only; used for strobed or basic I/O in Group B configuration. |
| PC0–PC7 | Port C I/O | 8-bit port split into upper (PC7–PC4) and lower (PC3–PC0) nibbles; serves as control/status for Ports A/B or general-purpose I/O. |
Key Features
| Feature | Design Value |
|---|---|
| Pin Compatibility with NMOS 8255A | Direct hardware replacement in legacy designs without PCB modification or firmware changes. |
| Direct Bit Set/Reset on Port C | Enables single-instruction manipulation of individual control bits (e.g., INTE flags, ACK/STB toggling) without full-port writes. |
| Three Operational Modes (0/1/2) | Supports basic I/O, strobed handshaking, and bidirectional bus protocols - reducing need for external glue logic in diverse peripheral interfaces. |
| TTL-Compatible I/O Levels | Guaranteed VIH ≥ 2.0V and VIL ≤ 0.8V across full temperature range - ensures interoperability with standard 5V logic families. |
| Low Standby Power (10µA) | Reduces system-level quiescent current in power-constrained applications such as portable test equipment or remote sensors. |
Applications
| Industrial PLC I/O Expansion | Legacy Microcontroller Peripherals |
|---|---|
Use Scenario: Adding parallel digital I/O to programmable logic controllers handling relay banks, limit switches, and indicator lamps. IC Role / Device Role / Timing Role: Configured in Mode 0 for simultaneous 24-bit parallel input/output with bus-hold preventing spurious transitions during wiring noise events. Use Value: Eliminates need for discrete buffers or pull-up networks, reducing BOM count and board space while ensuring deterministic I/O state retention. | Use Scenario: Interfacing keyboards, 7-segment displays, and stepper motor drivers to 80C86-based embedded controllers in test instrumentation. IC Role / Device Role / Timing Role: Port A in Mode 1 (strobed input) reads keyboard matrix; Port B in Mode 0 drives display segments; Port C supplies STB/ACK handshaking signals. Use Value: Enables synchronized, interrupt-driven peripheral interaction without CPU polling overhead or external timing logic. |
| Bidirectional Data Bus Adapter | Industrial Sensor Interface Hub |
Use Scenario: Connecting legacy 8-bit bidirectional data buses (e.g., printer ports, memory-mapped peripherals) to modern microprocessor subsystems. IC Role / Device Role / Timing Role: Port A configured in Mode 2 as 8-bit bidirectional bus with PC4–PC7 managing OBF, ACK, STB, and INTR signals under software control. Use Value: Provides full hardware handshaking and interrupt generation for safe, robust data exchange - avoiding bus contention or data loss. | Use Scenario: Aggregating multiple analog sensor outputs (via external ADCs) and digital status signals (e.g., fault flags, calibration locks) in factory automation nodes. IC Role / Device Role / Timing Role: Port C lower nibble reads ADC DRDY/EOC flags; Port A latches converted data; Port B outputs control signals to multiplexers or reference switches. Use Value: Centralizes timing-critical I/O coordination in one device, simplifying firmware and improving real-time response consistency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable parallel I/O applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CS82C55A-5Z | Same functional specification and PLCC-44 package; Pb-free variant without tape-and-reel suffix. | No functional difference; differs only in packaging format (bulk vs. tape-and-reel). | Select CS82C55A-5Z for manual assembly or small-batch prototyping where reel packaging is unnecessary. |
| IP82C55A | Identical core functionality but in 40-pin PDIP package; lacks PLCC mechanical compatibility. | Requires PCB redesign due to different footprint and lead pitch; suitable only for through-hole legacy systems. | Choose IP82C55A only when upgrading existing PDIP-based designs where PLCC rework is impractical. |
Compared with CS82C55A-5Z and IP82C55A, the CS82C55A96 offers identical electrical and functional behavior but is optimized for automated SMT placement via tape-and-reel delivery - critical for high-volume industrial manufacturing without sacrificing compatibility or performance.
Availability
CS82C55A96 is available at Aetrix Electronics and suitable for industrial PLCs, legacy microcontroller peripherals, bidirectional data bus adapters, and industrial sensor interface hubs requiring stable component supply across long product lifecycles.
Supply support for CS82C55A96 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Intersil Corporation, now part of Renesas Electronics, is a semiconductor manufacturer specializing in high-performance analog and mixed-signal ICs for industrial, aerospace, and computing applications.
The 82C55A product line was engineered as a CMOS drop-in replacement for the industry-standard NMOS 8255A, delivering identical functionality with lower power, enhanced noise immunity, and extended temperature operation for retrofitted and new industrial control systems.
FAQ
What is the maximum clock frequency supported by the CS82C55A96?
The CS82C55A96 supports up to 8MHz operation, enabling no-wait-state interfacing with 80C86 and 80C88 microprocessors. This timing specification is validated across the full –40°C to +85°C operating temperature range and assumes proper setup/hold timing on address and control signals per the FN2969 datasheet timing diagrams.
Does the CS82C55A96 require external pull-up resistors on its I/O pins?
No, the CS82C55A96 does not require external pull-up resistors. Its integrated bus-hold circuitry actively maintains valid logic levels on all I/O pins (PA0–PA7, PB0–PB7, PC0–PC7) during high-impedance states, eliminating the need for external termination components in fully CMOS systems.
How is the CS82C55A96 configured for bidirectional data transfer?
The CS82C55A96 is configured for bidirectional data transfer by programming Port A in Mode 2 via a software control word. In this mode, Port A operates as an 8-bit bidirectional bus while Port C (PC3–PC7) provides dedicated handshaking signals including OBF, ACK, STB, IBF, and INTR - all managed through the same control register interface.
Can the CS82C55A96 replace an older NMOS 8255A in an existing design?
Yes, the CS82C55A96 is pin-compatible and functionally equivalent to the NMOS 8255A. It retains identical pinout, control logic, and instruction set compatibility while offering improved DC characteristics, lower power consumption (10µA standby), and enhanced noise immunity - making it a direct drop-in upgrade without firmware or layout changes.
What package type is used for the CS82C55A96?
The CS82C55A96 uses a 44-lead Plastic Leaded Chip Carrier (PLCC) package, RoHS-compliant with matte tin terminations. The "96" suffix denotes tape-and-reel packaging optimized for automated SMT assembly, distinguishing it from bulk-packaged variants like CS82C55A-5Z.
CS82C55A96 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Number of I/O:
- 24
- Interface:
- Parallel
- Interrupt Output:
- No
- Features:
- -
- Output Type:
- Open Drain
- Current - Output Source/Sink:
- 2.5mA
- Clock Frequency:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-PLCC (16.58x16.58)
CS82C55A96 FAQ
1.How can I place an order for CS82C55A96 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS82C55A96 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for CS82C55A96 reliable?
The price and inventory of CS82C55A96 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS82C55A96 is usually 5 days.
3.What payment methods are accepted for CS82C55A96?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS82C55A96 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS82C55A96?
CS82C55A96 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS82C55A96 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for CS82C55A96?
For technical support, including CS82C55A96 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS82C55A96 requirements.
6.How does Aetrix verify that CS82C55A96 is sourced from the original manufacturer or authorized distributors?
All CS82C55A96 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CS82C55A96 meets industry standards.
7.What is the process for return or replacement of CS82C55A96?
All CS82C55A96 units undergo pre-shipment inspection (PSI). If there is an issue with CS82C55A96, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The CS82C55A96 part is unused and in its original packaging.
Return procedure for CS82C55A96:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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