CS82C54Z - 8MHz 3-Counter Programmable Timer | Renesas
N.º da peça: CS82C54Z ✗ Fim de vidaCS82C54Z Visão geral
A programmable interval timer is a timing IC that divides an external clock into programmable counts and manages events through counter, trigger, and gate signals. The 82C54 belongs to the broader counter and timer IC family, where each channel can operate independently. This architecture makes it suitable for industrial control, embedded processor systems, event sequencing, periodic interruption generation, and legacy computer interfaces.
The three counters provide 16-bit programmable count ranges, while the 8 MHz clock capability supports more than 65,536 timing events per second at the input limit. Device programming is performed through the CS, WR, A0, and A1 control interface, allowing a microprocessor or embedded controller to select modes and load count values. The CMOS bus interface supports integration with microprocessor-based control systems.
The CS82C54 is built with an advanced 2 µm CMOS process according to the indexed device documentation. Its single 5 V supply simplifies system power design, while the three independently programmable counters reduce the need for separate timer peripherals. The manufacturer identifies the device as compatible with industry-standard Intel 80C86, 80C88, and 80C286 CMOS microprocessor configurations.
Typical applications include elapsed-time measurement, event counting, periodic pulse generation, one-shot timing, industrial sequencers, embedded control systems, and legacy processor peripherals. In each case, the external clock source and counter programming determine the effective timing resolution. The maximum input frequency should not be exceeded, and unused counter inputs should be handled according to the manufacturer datasheet.
Designers should account for clock jitter, counter rollover, read-latch timing, and signal contention when the timer is connected to a processor bus. Because the package is a surface-mount PLCC, assembly requires a compatible footprint and adequate process capability for leaded plastic LCC packages. The available operating-temperature information applies to the documented 82C54 variant rather than every possible package option.
This product page consolidates verified distributor pricing, manufacturer timing capabilities, cross-reference candidates, and practical selection guidance. It also distinguishes documented electrical facts from package-specific information that remains to be confirmed from the official datasheet before a new PCB or qualification build is released.
Alternativas drop-in para CS82C54Z — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com CS82C54Z (mesmo formato e footprint) — diferindo em Counter Resolution, Manufacturer, Number of Counters, Operating Temperature, Package.
IS82C54-10
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MSC8254SAG1000B
✅ Drop-InConsulte o preço
Ver ficha técnica →AM9513
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
CS82C54Z96
✅ Drop-InConsulte o preço
Ver ficha técnica →QD8254-2
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
CS82C54Z Especificações
| Product Type | CMOS programmable interval timer |
| Manufacturer | Renesas Electronics |
| Number of Counters | 3 independently programmable counters |
| Counter Resolution | 16 bit |
| Maximum Clock Input Frequency | 8 MHz for CS82C54 |
| Tensão de alimentação | 4.5 V to 5.5 V |
| Nominal Supply Voltage | 5 V |
| Bus Interface | CMOS |
| Programmable Timer Modes | 6 modes |
| Process Technology | 2 µm CMOS |
| Encapsulamento | 28-pin PLCC (11.51 mm x 11.51 mm), MS-018AB |
| Tipo de montagem | Surface mount |
| Temperatura de operação | 0 °C to 70 °C |
| Dimensional Package Reference | MS-018AB |
Guia de Configuração de Pinos do CS82C54Z ms-018ab
Configuração de pinos para CS82C54Z (pacote ms-018ab). A numeração dos pinos, funções e diagramas de conexão estão definidos no datasheet do fabricante. Consulte-o para o footprint exato e diretrizes de soldagem.
Nenhum dado detalhado de pinagem disponível para CS82C54Z.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
CS82C54Z é adequado para 6 aplicaçãos: Industrial Event Counter, Elapsed-Time Measurement, Periodic Pulse Generation, Legacy Microprocessor Timing, Programmable One-Shot Control, Process-Control Sequence Timing.
Industrial Event Counter
The CS82C54Z is appropriate for industrial event counting because it provides three independent 16-bit counters and accepts clock inputs up to 8 MHz. Each channel can count pulses from a sensor, encoder, or machine event while the processor reads the accumulated value through the CS, WR, A0, and A1 interface. The 4.5 V to 5.5 V supply range supports 5 V digital systems, while the 0 °C to 70 °C rating should be checked against the enclosure temperature. Engineers should design for rollover, debounce, and clock-jitter effects rather than treating every counted pulse as a perfectly regular event.
Recomendado
Elapsed-Time Measurement
The CS82C54Z can measure elapsed time by counting a fixed-frequency reference clock in one of its 16-bit counters. At the documented maximum input of 8 MHz, the raw count rate is 8 million increments per second, allowing time intervals to be represented with clock-defined resolution and programmable scaling. A second or third counter can track separate events without additional timer ICs. System designers should account for counter overflow, reference-clock accuracy, and any software calibration when converting counts into time, and they should preserve the read-latch behavior supported by the 82C54 family.
Recomendado
Periodic Pulse Generation
The three-counter architecture makes the CS82C54Z useful for periodic pulse generation and programmable one-shot timing in legacy control systems. A processor can load a 16-bit count into one channel, configure its mode, and use the resulting output to trigger an actuator or initiate a conversion. The six programmable modes support more than a simple repeat counter, allowing the same device to implement event counters, elapsed-time indicators, and programmable one-shots. Because the device is a 5 V legacy timer, interface level translation may be required when driving modern 3.3 V peripherals or long external lines.
Recomendado
Legacy Microprocessor Timing
The CS82C54Z fits legacy microprocessor timing blocks because the manufacturer identifies compatibility with industry-standard Intel 80C86, 80C88, and 80C286 CMOS configurations. Its programmable chip-select, read, write, and address decoding signals allow a host processor to initialize and read the three counters without duplicating timer hardware. The 28-pin PLCC package supports reuse of an existing motherboard footprint. Before replacing an installed timer, verify the exact clock edge definitions, reset behavior, read-latch timing, and signal timing because legacy peripherals often depend on those details at the bus level.
Recomendado
Programmable One-Shot Control
A programmable one-shot application benefits from the CS82C54Z's dedicated counter modes and 16-bit reload values. The host logic can trigger a single timed interval, after which the timer output returns to its inactive state without continuous intervention from the processor. This can coordinate motor-start pulses, actuator delays, or test-enable windows in a legacy automation controller. The external clock must remain within the 8 MHz limit, and the output timing tolerance depends on the reference oscillator and the counter quantity programmed. The system should also provide pull components or reset initialization appropriate to the manufacturer's documented control interface.
Recomendado
Process-Control Sequence Timing
The CS82C54Z can support process-control sequencing by combining event counting with elapsed-time intervals in one 5 V timer device. One counter may track production events, another may delay a sequence step, and the third can produce a repeatable timing interval. This integration reduces the number of discrete counters required by older industrial controllers while preserving a familiar processor programming model. For factory deployment, verify that the 0 °C to 70 °C device rating matches the environmental envelope and isolate long sensor wiring from the counter clock to avoid false counts or timing jitter.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para CS82C54Z — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | IS82C54-10 | 8254 | AM9513 | 82C54 | QD8254-2 |
|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Intel | AMD | Renesas Electronics | QD |
| Package | 28-pin PLCC (11.51 mm x 11.51 mm), MS-018AB | 28-pin PLCC candidate; exact suffix must be confirmed | 28-pin PLCC candidate; exact suffix must be confirmed | 28-pin PLCC candidate; exact suffix must be confirmed | 28-pin PLCC candidate; exact suffix must be confirmed | 28-pin PLCC candidate; exact suffix must be confirmed |
| Counter Count | 3 | 3 | 3 | 3 | 3 | 3 |
| Counter Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit |
| Programmable Modes | 6 | 6 | 6 | 6 | 6 | 6 |
Principais diferenciais
- Directly documented 8 MHz clock grade (vs IS82C54-10)
- Three independent counters in one timer device (vs 8254)
- Documented commercial-temperature operating range (vs AM9513)
Notas de projeto
Do not treat every 82C54 ordering code as electrically interchangeable. The base 82C54 is documented up to 8 MHz, while the 82C54-10 and 82C54-12 grades have higher limits. For a replacement, compare the complete ordering suffix, PLCC pinout, reset and read-latch timing, counter modes, temperature grade, and electrical timing. The CS82C54Z price entries also refer to legacy inventory, so authenticity and traceability should be checked before production use.
Route each counter clock as a short, continuous timing signal and keep it away from noisy switching nodes and long processor-bus traces. Use a ground plane for return current and place any input conditioning close to the PLCC pins. When an external oscillator drives the timer, respect the 8 MHz maximum and control edge jitter; otherwise, counting and elapsed-time accuracy can degrade even though the counter logic itself operates correctly.
The CS82C54Z requires a nominal 5 V rail, and the indexed supply range is 4.5 V to 5.5 V. Provide stable 5 V power with low ripple and adequate decoupling at the device. The supplied data does not state the recommended capacitor values, so those must be taken from the official datasheet and application guidance rather than guessed. Confirm the design's noise margin at the clock and control inputs.
The processor-controlled CS, WR, A0, and A1 signals must be sequenced according to the 82C54 timing requirements. Preserve the read-latch behavior when the host needs a stable count while another counter continues running. Because this is a legacy CMOS device, avoid excessive bus loading and level-conversion delays, and review whether the installed system still supports the original 5 V input thresholds and output timing.
Informações de conformidade
The verified extracts do not provide explicit RoHS, REACH, lead-free, halogen-free, or conflict-minerals declarations. AEC-Q100 is treated as not applicable because the device is a legacy commercial-temperature timer rather than an identified automotive-qualified option.
