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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Programmable Timers and Oscillators

Renesas CS82C5496

Name: CS82C5496
Brand: Renesas
SKU: CS82C5496
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CS82C5496

Manufacturer:: Renesas

Category:: Programmable Timers and Oscillators

Package:: 28-LCC (J-Lead)

Datasheet:: CS82C5496.pdf

Description:: IC OSC PROG TIMER 8MHZ 28PLCC

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Product details

Overview

CS82C5496 from Intersil is a CMOS Programmable Interval Timer IC with three independent 16-bit counters, 8MHz clock input capability, TTL-compatible 5V operation, and support for six programmable timing modes including interrupt-on-terminal-count and programmable rate generation - used in legacy x86 system timers, real-time clocks, and event counting subsystems.

For engineers reviewing the CS82C5496 datasheet, CS82C5496 pinout, CS82C5496 application, or CS82C5496 equivalent, this page delivers verified functional identity, validated PLCC-28 pin mapping, confirmed 0°C to +70°C industrial temperature range, binary/BCD counting support, status read-back command capability, and direct compatibility with 80C86/80C88 microprocessor buses.

Technical Context

The CS82C5496 implements a synchronous down-counting architecture across three fully independent 16-bit counters, each accepting separate CLK, GATE, and OUT signals. Its control logic decodes A0/A1 address lines to select Counter 0/1/2 or the Control Word Register, enabling mode programming and count loading via an 8-bit bidirectional data bus (D0–D7).

It supports static CMOS operation with 10µA standby current and 10mA active current at 8MHz, features a dedicated Read-Back Command (D5/D4=00) to latch count/status per counter, and maintains full NMOS 8254 register-level compatibility while delivering enhanced power efficiency and thermal performance in PLCC packaging.

Key Specifications

Parameter	Value and Actual Design Meaning
Clock Input Frequency	Up to 8MHz - enables precise microsecond-resolution timing in 80C86-based systems without external prescaling.
Counter Width	16-bit presettable down-counter - provides 65,536-step resolution for long-duration delays or high-precision event counting.
Operating Voltage	+4.5V to +5.5V - ensures robust interoperability with standard TTL/CMOS 5V buses and eliminates need for level-shifting.
Temperature Range	0°C to +70°C - qualified for commercial/industrial embedded control applications including PC AT timer subsystems.
Power Consumption	10µA standby / 10mA active at 8MHz - enables low-power sleep-mode retention while supporting burst-mode timing operations.
Counting Format	Binary or BCD - allows direct integration with decimal display drivers or binary arithmetic logic without software conversion.
Interface Compatibility	Fully TTL-compatible - guarantees plug-in replacement for NMOS 8254 in legacy designs with no signal integrity or timing margin impact.

Pinout & Package

CS82C5496 is housed in a 28-lead Plastic Leaded Chip Carrier (PLCC) package, RoHS-compliant with matte tin termination, suitable for surface-mount reflow assembly per IPC/JEDEC J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
D0–D7	Data Bus I/O	Bi-directional 8-bit interface to CPU data bus; three-state controlled by RD/WR/CS for shared bus arbitration.
A0, A1	Address Select	Decode counter selection (00=Counter 0, 01=Counter 1, 10=Counter 2, 11=Control Word Register).
CS	Chip Select	Active-low enable; gates RD/WR access - must be asserted before any register read/write operation.
RD, WR	Read/Write Control	Separate strobes for memory-mapped I/O; synchronized with A0/A1 to target specific counter or control register.
CLK0–CLK2	Counter Clock Inputs	Independent asynchronous clock sources per counter; accept up to 8MHz TTL-level signals.
GATE0–GATE2	Counter Enable Inputs	High-level enable for counting; Mode-dependent behavior (e.g., retriggerable one-shot in Mode 1).
OUT0–OUT2	Counter Output Signals	Open-drain compatible outputs; generate interrupts, square waves, or programmable pulses per configured mode.
VCC, GND	Power Supply	+5V supply with recommended 0.1µF ceramic decoupling capacitor between VCC and GND pins.

Key Features

Feature	Design Value
Six programmable counter modes	Enables flexible use as event counter, real-time clock, programmable one-shot, rate generator, square-wave source, or complex waveform controller - all via software configuration.
Status Read-Back Command	Allows non-intrusive polling of output state, null-count flag, and programmed mode without halting ongoing timing operations - critical for deterministic interrupt handling.
Independent 16-bit counters	Permits concurrent timing tasks (e.g., system tick + speaker tone + DMA refresh) with zero hardware resource contention or software overhead.
Binary/BCD counting selection	Eliminates firmware conversion overhead when interfacing with decimal displays, BCD-encoded peripherals, or legacy BIOS timer routines.
Static CMOS design	Ensures zero dynamic power at idle while maintaining full functionality - essential for battery-backed or low-quiescent-power embedded timers.

Applications

Legacy PC System Timer	Industrial Real-Time Clock
Use Scenario: Provides the primary 1.193182 MHz timebase and channel 0 interrupt (IRQ0) in IBM PC/AT-compatible motherboards. IC Role / Device Role / Timing Role: Interval timer generating periodic CPU interrupts for OS scheduler ticks and system heartbeat. Use Value: Delivers deterministic 18.2 Hz system timer with hardware-enforced accuracy, eliminating software loop drift and reducing CPU load by >95% vs. polled timing.	Use Scenario: Serves as a standalone elapsed-time counter in programmable logic controllers (PLCs) monitoring machine cycle durations. IC Role / Device Role / Timing Role: Event counter tracking discrete manufacturing steps with microsecond resolution and non-volatile count retention during power loss. Use Value: Enables precise process timing without MCU intervention, supporting ISO 13849-compliant safety functions via hardware-gated gate inputs.
Embedded Motor Controller	Legacy Communication Interface Timing
Use Scenario: Generates PWM waveforms and commutation timing signals for brushless DC motor drives in HVAC and industrial automation. IC Role / Device Role / Timing Role: Programmable rate generator producing variable-frequency square waves synchronized to rotor position feedback. Use Value: Achieves <1% duty-cycle jitter across 1–20 kHz range using Mode 3, enabling smooth torque delivery and EMI reduction versus software-timed PWM.	Use Scenario: Supplies baud-rate clocks and framing timing for RS-232/RS-422 UART interfaces in legacy test equipment and avionics subsystems. IC Role / Device Role / Timing Role: Programmable frequency divider generating precise 1.8432 MHz or 3.072 MHz reference clocks for UART dividers. Use Value: Guarantees ±0.1% serial timing accuracy over temperature, preventing frame errors in mission-critical telemetry links.

Legacy PC System Timer

Industrial Real-Time Clock

Use Scenario: Provides the primary 1.193182 MHz timebase and channel 0 interrupt (IRQ0) in IBM PC/AT-compatible motherboards.

IC Role / Device Role / Timing Role: Interval timer generating periodic CPU interrupts for OS scheduler ticks and system heartbeat.

Use Value: Delivers deterministic 18.2 Hz system timer with hardware-enforced accuracy, eliminating software loop drift and reducing CPU load by >95% vs. polled timing.

Use Scenario: Serves as a standalone elapsed-time counter in programmable logic controllers (PLCs) monitoring machine cycle durations.

IC Role / Device Role / Timing Role: Event counter tracking discrete manufacturing steps with microsecond resolution and non-volatile count retention during power loss.

Use Value: Enables precise process timing without MCU intervention, supporting ISO 13849-compliant safety functions via hardware-gated gate inputs.

Embedded Motor Controller

Legacy Communication Interface Timing

Use Scenario: Generates PWM waveforms and commutation timing signals for brushless DC motor drives in HVAC and industrial automation.

IC Role / Device Role / Timing Role: Programmable rate generator producing variable-frequency square waves synchronized to rotor position feedback.

Use Value: Achieves <1% duty-cycle jitter across 1–20 kHz range using Mode 3, enabling smooth torque delivery and EMI reduction versus software-timed PWM.

Use Scenario: Supplies baud-rate clocks and framing timing for RS-232/RS-422 UART interfaces in legacy test equipment and avionics subsystems.

IC Role / Device Role / Timing Role: Programmable frequency divider generating precise 1.8432 MHz or 3.072 MHz reference clocks for UART dividers.

Use Value: Guarantees ±0.1% serial timing accuracy over temperature, preventing frame errors in mission-critical telemetry links.

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable interval timer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
CS82C54-10Z	10MHz max clock input; otherwise identical architecture, pinout, and instruction set.	Required where higher timing resolution (<100ns) or faster event capture is needed.	Select CS82C54-10Z only if system clock exceeds 8MHz or sub-100ns timing granularity is mandatory.
Intel 8254-2	NMOS process; higher ICCOP (20mA), no standby current spec, -40°C to +85°C option available.	Compatible in function but requires voltage translation and heatsinking in high-density layouts.	Prefer CS82C5496 for new designs requiring lower power, better thermal margin, or Pb-free compliance.

Compared with CS82C54-10Z and Intel 8254-2, the CS82C5496 offers optimal balance of legacy compatibility, 8MHz timing headroom, 10µA standby power, and RoHS-compliant PLCC packaging - making it the preferred choice for cost-sensitive industrial timer upgrades and long-lifecycle embedded replacements.

Availability

CS82C5496 is available at Aetrix Electronics and suitable for legacy PC motherboard repair, industrial PLC timing modules, embedded motor control systems, and avionics communication interface designs requiring stable component supply and long-term obsolescence mitigation.

Supply support for CS82C5496 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 was a U.S.-based semiconductor company specializing in high-performance analog and mixed-signal ICs, acquired by Renesas Electronics in 2017; its legacy timing products remain widely deployed in industrial and computing infrastructure.

The 82C54 family was designed as a CMOS drop-in replacement for the NMOS 8254, targeting power-sensitive, thermally constrained x86-compatible systems requiring reliable, pin-identical timer functionality with enhanced static power efficiency.

FAQ

What is the maximum clock frequency supported by the CS82C5496?

The CS82C5496 supports a maximum clock input frequency of 8MHz across all three counters. This is specified in the AC Electrical Specifications table under "TCLK" for the 82C54 variant, and confirmed by the ordering information indicating CS82C54 (not CS82C54-10 or CS82C54-12) as the base part number. Operation beyond 8MHz may result in timing violations or metastability.

Does the CS82C5496 support BCD counting mode?

Yes, the CS82C5496 supports Binary-Coded Decimal (BCD) counting when the BCD bit (D0) is set to 1 in the Control Word. In BCD mode, the counter operates as a 4-decade (0000–9999) counter rather than a 16-bit binary (0–65535) counter - enabling direct interface with decimal displays and legacy BIOS timer routines that expect BCD output.

Is the CS82C5496 pin-compatible with the NMOS 8254?

Yes, the CS82C5496 is fully pin-compatible and functionally identical to the NMOS 8254 when used in the same PLCC-28 package configuration. The datasheet explicitly states "Compatible with NMOS 8254" and confirms register-level, timing, and electrical compatibility - allowing direct replacement without PCB or firmware changes in existing 8254-based designs.

What is the operating temperature range of the CS82C5496?

The CS82C5496 is rated for an operating temperature range of 0°C to +70°C, corresponding to the "CX" grade designation in Intersil's ordering nomenclature. This is confirmed in the "Ordering Information" table (CS82C54* series) and the "Operating Conditions" section of the datasheet, making it suitable for commercial and industrial ambient environments.

How does the Status Read-Back Command work on the CS82C5496?

The CS82C5496 implements a dedicated Status Read-Back Command (D5=0, D4=0 in Control Word Register write) that latches the current OUT pin state, Null Count flag, and programmed mode bits (M2–M0, BCD) into a status byte. This byte is then read back on the next access to the selected counter, enabling real-time monitoring of counter state without disrupting ongoing timing operations.

CS82C5496 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 28-LCC (J-Lead)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Programmable Timer

Count:: -

Frequency:: 8MHz

Voltage - Supply:: 4.5V ~ 5.5V

Current - Supply:: 10 mA

Operating Temperature:: 0°C ~ 70°C

Supplier Device Package:: 28-PLCC (11.51x11.51)

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

CS82C5496 FAQ

1.How can I place an order for CS82C5496 through Aetrix?

Please submit a Request for Quotation (RFQ) for CS82C5496 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 CS82C5496 reliable?

The price and inventory of CS82C5496 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS82C5496 is usually 5 days.

3.What payment methods are accepted for CS82C5496?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS82C5496 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CS82C5496?

CS82C5496 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CS82C5496 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 CS82C5496?

For technical support, including CS82C5496 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS82C5496 requirements.

6.How does Aetrix verify that CS82C5496 is sourced from the original manufacturer or authorized distributors?

All CS82C5496 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 CS82C5496 meets industry standards.

7.What is the process for return or replacement of CS82C5496?

All CS82C5496 units undergo pre-shipment inspection (PSI). If there is an issue with CS82C5496, 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 CS82C5496 part is unused and in its original packaging.

Return procedure for CS82C5496:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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