CS82C54 - 8 MHz Programmable Timer | 28-PLCC | Renesas
MPN: CS82C54 ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.5477 | $4.55 |
| 10 | $4.5477 | $45.48 |
| 100 | $4.5477 | $454.77 |
| 500 | $4.5477 | $2,273.85 |
| 1,000 | $4.5477 | $4,547.70 |
CS82C54 Overview
A programmable interval timer is a clock-and-timing semiconductor that divides or counts input-clock pulses and reports events through counter values, status signals, and programmable outputs. The CS82C54 belongs to the broader timer and counter IC hierarchy, where multiple channels provide independent timing or event-counting functions under a common control interface.
The device provides three independently programmable 16-bit counters, binary or BCD counting, status readback, and compatibility with NMOS 8254 operation. Each counter can select among six operating modes, allowing engineers to implement simple event counting, rate division, square-wave generation, one-shot timing, and retriggerable or triggered monostable behavior. The verified 8 MHz version supports clock inputs up to 8 MHz.
Its 28-pin PLCC package provides a legacy-compatible surface-mount footprint, while the parallel control and data interface supports connection to microprocessor address, data, read/write, chip-select, reset, and clock buses. Because this is a digital integrated circuit rather than a power semiconductor, a Safe Operating Area chart is not applicable.
Typical uses include industrial controller timing, event-counting modules, embedded system peripherals, waveform generation, and service as a hardware timer for legacy 8254-compatible systems. Engineers should verify the complete datasheet pinout, supply limits, timing values, electrical characteristics, and package details before production use, because several of those values are not included in the supplied search record.
This product page combines the verified 8 MHz and 28-PLCC identifiers with sourced cross-reference information and explicitly marks unavailable technical data. It is intended to help engineers locate the datasheet, assess procurement options, verify compatibility, and plan validation before substituting or implementing the timer.
Drop-in alternatives for CS82C54 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with CS82C54 (same form factor and footprint) — differing in Legacy Compatibility, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
CS82C54Z96
✅ Drop-In✓ In Stock
$10.85 / Unit
View Datasheet →82C54-10
✅ Drop-In📋 Reference alternative (not in catalog)
82C54-12
✅ Drop-In📋 Reference alternative (not in catalog)
CS82C54Z96
✅ Drop-In✓ In Stock
$10.85 / Unit
View Datasheet →CS82C54-10Z96
✅ Drop-In📋 Reference alternative (not in catalog)
CS82C54 Specifications
| Product Type | CMOS programmable interval timer |
| Number of Counters | 3 |
| Counter Width | 16 bit |
| Maximum Clock Input Frequency | 8 MHz |
| Programmable Counter Modes | 6 |
| Counting Formats | Binary or BCD |
| Status Readback | Supported |
| Legacy Compatibility | Compatible with NMOS 8254 |
| Process Technology | Advanced 2 micron CMOS process |
| Package | 28-pin PLCC |
| Package Body Size | 11.51 mm x 11.51 mm |
| Mounting Type | Surface mount |
| RoHS Status | unknown |
| REACH Status | unknown |
CS82C54 11.51 mm x 11.51 mm Pin Configuration Guide
Pin configuration for CS82C54 (11.51 mm x 11.51 mm package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for CS82C54.
Refer to the datasheet for full pin configuration.
Typical Applications
CS82C54 is suitable for 6 applications: Industrial Event Counting, Microprocessor Timer Peripheral, Periodic Waveform Generation, Data-Acquisition Triggering, Embedded System Frequency Divider, Legacy 8254-Compatible Control Card.
Industrial Event Counting
The CS82C54 fits industrial event-counting modules where pulses from switches, encoders, or sensors must be accumulated and periodically read by a controller. Its three independent 16-bit counters allow separate channels for different event sources, while the verified 8 MHz input limit supports high-rate counting. Six operating modes provide flexibility for counting, rate division, and periodic output functions. In implementation, connect one counter to the event source, configure the mode and count value through the parallel control interface, and poll or latch status as required. Validate signal levels, debounce behavior, counter rollover handling, and isolation before using the timer in industrial equipment.
Recommended
Microprocessor Timer Peripheral
The CS82C54 provides three hardware timing channels for legacy microprocessor and controller systems that need deterministic interval or elapsed-time measurement. Each channel has a 16-bit counter and access to six programmable modes, reducing the software burden associated with continuous timing loops. The device is suitable when the host must address and read the timer through a parallel bus and needs fixed event timing independently of firmware execution. Design the address decode, read/write control, reset, and clock source so that the timer channel ownership is unambiguous. Confirm bus timing and signal levels against the official datasheet because those electrical limits are not present in the supplied search summary.
Recommended
Periodic Waveform Generation
The CS82C54 can generate periodic and programmable waveforms by combining its 16-bit counters, programmable modes, and output signals. This is useful in legacy control systems that need a continuous frequency divider, square-wave reference, or timing pulse without dedicating a processor output pin. The verified 8 MHz maximum input frequency provides a basis for shorter programmable periods, while six modes allow selection between simple rate division and more specialized triggered behavior. Route counter outputs through appropriate buffering, confirm output-drive assumptions, and preserve a defined state during reset. Scope timing edges and duty-cycle behavior in the final design because output timing and propagation values require confirmation from the official manufacturer datasheet.
Recommended
Data-Acquisition Triggering
The CS82C54 can act as a trigger or interval source in data-acquisition systems that need repeatable sampling windows or synchronized timing events. Its three independent 16-bit channels allow acquisition trigger, measurement interval, and auxiliary countdown functions to share one programmable timer. The 8 MHz clock capability is relevant when the controller must resolve relatively short timing intervals, although the minimum valid pulse width and counter timing margins must be checked in the datasheet. Define trigger polarity, reset behavior, and rollover semantics before connecting it to converters or interface hardware. Use the timer as a timing reference rather than assuming it performs level conversion or isolation.
Recommended
Embedded System Frequency Divider
The CS82C54 is useful as a frequency-divider and programmable time-base peripheral in embedded equipment built around a parallel processor bus. A selected 16-bit counter can reduce a clock stream into a slower periodic signal, while the remaining channels can handle independent timing functions. This is particularly useful when firmware needs a repeatable service interval without tying up a high-frequency processor timer. Choose the input clock carefully, account for counter loading and edge timing, and avoid using a divider output where a failure could create unsafe control behavior. Validate reset startup and output-state requirements with a bench test using the exact package and system clock arrangement.
Recommended
Legacy 8254-Compatible Control Card
The CS82C54 is a logical choice for maintaining or repairing legacy 8254-compatible control cards because the supplied comparison data explicitly identifies NMOS 8254 compatibility and the family provides three independent 16-bit counters with six modes. It can preserve an established parallel-bus timing architecture without requiring a software timer for every event. Compatibility must be confirmed at the package and electrical level, especially for boards using exposed-edge, read/write timing, or signal-level assumptions inherited from older 8254 devices. Before fitting the timer, inspect the original schematic for pin assignments and compare every connected signal with the current Renesas datasheet. For production repairs, validate readback, mode transitions, rollover, and all three counter outputs under representative loads.
Recommended
Recommended Products Summary
Engineering reference data for CS82C54 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 82C54 | 82C54-10 | 82C54-12 | CS82C54Z | CS82C54-10Z96 |
|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Counter Count | 3 | 3 | 3 | 3 | 3 | 3 |
| Counter Width | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit |
| Maximum Clock Input Frequency | 8 MHz | 8 MHz | 10 MHz | 12 MHz | 8 MHz | 10 MHz |
Key Differentiators
- Three independent timing channels (vs Intel 8254)
- Eight-megahertz family operating point (vs 82C54-10)
- CMOS implementation with six counter modes (vs NMOS 8253)
Design Notes
Treat the 28-PLCC footprint as a legacy-land-pattern problem and verify every pin against the current Renesas datasheet before routing or replacement. The search record confirms an 11.51 mm by 11.51 mm PLCC package, but it does not provide individual pin names or numbering. Preserve the original clock, reset, read/write, chip-select, bus, counter-output, and supply connections, and check whether any alternate suffix changes temperature, qualification, or marking requirements.
Keep the 8 MHz clock source and counter connections away from noisy switching nodes, because clock-edge jitter and false triggering affect the effective count ratio. Use short traces, a stable return path, and appropriate termination or buffering where the source is not adjacent. Confirm the official input pulse-width, setup, hold, and propagation specifications before selecting buffer delay or fan-out components.
Do not confuse the 82C54, 82C54-10, and 82C54-12 speed grades. The verified Renesas listing identifies maximum clock inputs of 8 MHz, 10 MHz, and 12 MHz respectively. A faster grade may change timing margins but does not by itself prove that every electrical, temperature, qualification, or package detail is interchangeable. Validate the exact suffix against the system clock and qualification requirements.
Compliance Information
The supplied verified search results do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. No compliance claim is inferred.
