CS82C54-12 - 12MHz 3-Counter CMOS Timer | Renesas
MPN: CS82C54-12 ✓ فعالCS82C54-12 نمای کلی
A programmable interval timer is a clock-and-timing IC that counts clock periods and divides or measures time according to values written over its bus interface. The 8254 architecture belongs to the broader timer-counter category, within clock and timing circuits and programmable logic devices. By operating at the same timing rates and presenting three programmable counting channels, the CS82C54-12 supports event counting, periodic interruption generation, frequency division, delay generation, and time-interval measurement.
Three independent 16-bit counters give the device separate channels for related timing tasks. Each counter can be programmed through the device bus, while the 12 MHz clock input supports event rates higher than those of the original NMOS 8254 implementation. The CMOS manufacturing process reduces the power consumption associated with older NMOS timer circuits, and the 5 V supply simplifies integration with conventional 5 V digital logic. Its 28-pin PLCC MS-018AB package also supports compact insertion into appropriately designed through-hole or mixed-technology assemblies.
The CS82C54-12 is compatible with the NMOS 8254 and is identified as an enhanced version of the NMOS 8253. Its three independently programmable and functionally independent timer channels allow multiple timing functions to be consolidated in one device. The 16-bit counter width accommodates programmed interval values from 1 to 65,536 when operated as a binary down-counter, subject to the operating mode and loading method selected by the system.
Typical uses include industrial control timing, periodic task scheduling, digital event counting, waveform-rate generation, frequency division, and legacy peripheral-interface designs. It can also serve measurement and sequencing systems where a host processor writes timing parameters and reads or monitors the associated counter state. The 12 MHz maximum clock input is particularly useful when multiple channels must operate from one shared reference.
Designers should preserve the 5 V supply tolerance, match the clock and control signal transition requirements, and validate counter behavior in the exact operating mode selected. The PLCC footprint requires plated through-holes or a compatible socket and is not interchangeable with a small-outline or leaded-DIP footprint without a board-level transition.
This page combines the device specifications, package constraints, timing use cases, verified cross-reference candidates, and design guidance needed to evaluate the CS82C54-12 before incorporating it into a new or legacy control system.
جایگزین‌های drop-in برای CS82C54-12 — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
گونه‌ها در این سری
مدل‌های هم‌سری که جایگزین مستقیم هستند برای CS82C54-12 (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Legacy Compatibility, Maximum Clock Input Frequency, Number of Counters, Process Technology.
CS82C54-12Z
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
CS82C54
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←CP82C54-12
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
IP82C54Z
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
P82C54
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
CS82C54-12 مشخصات
| Device Type | CMOS programmable interval timer |
| Maximum Clock Input Frequency | 12 MHz |
| Number of Counters | 3 independent counters |
| Counter Resolution | 16 bit |
| ولتاژ تغذیه | 5 V nominal; 4.5 V to 5.5 V operating range |
| Bus Interface | CMOS |
| Legacy Compatibility | Compatible with NMOS 8254; enhanced version of NMOS 8253 |
| Process Technology | 2 micron CMOS process |
| Package Type | 28-pin PLCC, MS-018AB, LCC-28 |
| Package Dimensions | 11.51 mm x 11.51 mm |
| نوع نصب | Surface mount |
| دمای کاری | 0 C to 70 C |
| Operating Temperature in Fahrenheit | 32 F to 158 F |
| تعداد پین‌ها | 28 pins |
| Manufacturer | Intersil Corporation |
| Current Manufacturer | Renesas Electronics Corporation |
راهنمای پیکربندی پین CS82C54-12 11.51 mm x 11.51 mm
پیکربندی پین برای CS82C54-12 (پکیج 11.51 mm x 11.51 mm). شماره‌گذاری پایه‌ها، عملکردها و نمودارهای اتصال در دیتاشیت سازنده تعریف شده است. برای footprint دقیق و دستورالعمل‌های لحیم‌کاری به آن مراجعه کنید.
داده پین‌آوت تفصیلی موجود نیست برای CS82C54-12.
به دیتاشیت برای پیکربندی کامل پین‌ها.
کاربردهای معمول
CS82C54-12 مناسب است برای 6 کاربردs: Industrial Event Counting, Periodic Interrupt Generation, Frequency Division, Time-Interval Measurement, Legacy 8254 Interface Emulation, Programmable Delay Generation.
Industrial Event Counting
The CS82C54-12 is suitable for counting external events when a system needs more flexibility than a fixed pulse counter. Its three independent 16-bit counters can be assigned to separate event sources, while the 12 MHz maximum clock input provides margin above the typical event rate of a mechanical switch, relay, or encoder line. According to the Intersil manufacturer datasheet, each channel can be programmed independently. The timer is used alongside a host processor that writes the counter mode and reload value, monitors the counter status, and handles wraparound or terminal-count events. The principal design consideration is conditioning noisy input signals so that only valid edges are counted. Its 0 C to 70 C rating suits commercial-temperature industrial equipment but does not cover extended-temperature or automotive environments.
Periodic Interrupt Generation
The CS82C54-12 can generate periodic timing events for embedded control loops, data acquisition, and service tasks. Its 12 MHz clock input and programmable 16-bit counters allow interval and rate values to be selected from the timer programming interface instead of relying on software delay loops. According to the Intersil manufacturer datasheet, three counters operate independently, allowing multiple periodic events to be scheduled without duplicating timer hardware. In a typical implementation, the processor initializes one or more counters, enables the relevant outputs or reads terminal-count status, and services the interrupt when the count expires. Designers should account for interrupt latency when choosing the shortest interval and should verify the selected operating mode because read/latch behavior and reload timing can affect repeatability.
Frequency Division
The CS82C54-12 can divide an incoming clock into a lower periodic rate for digital control and legacy interface timing. Its three independent 16-bit channels allow one reference clock to support multiple division ratios, and the maximum clock input of 12 MHz provides flexibility for dividing higher-frequency sources. According to the Intersil manufacturer datasheet, the device is compatible with the NMOS 8254 architecture and supports multiple independently programmed counter functions. A typical circuit feeds a stable clock into one channel and uses the resulting output as a lower-rate strobe, divide-by-two signal, or periodic sampling source. The output frequency depends on the programmed count, counter mode, and clock accuracy. Validate jitter requirements against the selected mode because square-wave and one-shot counting behavior differ when terminal count is reached.
Time-Interval Measurement
The CS82C54-12 can measure elapsed time between two events by loading one 16-bit counter and connecting the event under measurement to its gate input. With a 12 MHz maximum clock input, the device offers a nominal clock interval of about 83.3 ns when operated at the maximum frequency, although the final resolution depends on the actual clock and counter configuration. According to the Intersil manufacturer datasheet, the timer contains three independent 16-bit counters, allowing several measurements to be coordinated. A control system can capture the count before and after the event and calculate the interval. Account for propagation delay, event-edge alignment, counter overflow, and interrupt-handling latency when interpreting the measured duration, particularly for very short intervals.
Legacy 8254 Interface Emulation
The CS82C54-12 is appropriate for maintaining or recreating legacy systems built around the 8254 timer architecture. Its CMOS bus interface, 4.5 V to 5.5 V supply range, and compatibility with the NMOS 8254 make it a logical member of a controller board that uses an 8253 or 8254 register map. According to the Intersil manufacturer datasheet, it is an enhanced CMOS version of the NMOS 8253. It can support periodic timing, event counting, and programmable delays in equipment that retains an established processor interface. Migration still requires exact verification of control-signal timing, read and write sequencing, reset behavior, and counter-mode semantics. Do not infer complete software equivalence from the architectural compatibility statement alone.
Programmable Delay Generation
The CS82C54-12 can produce hardware-timed delays when software timing would be too variable or too costly. Its three independent 16-bit counters allow separate delay channels, while the 12 MHz clock capability supports relatively fine timing resolution. According to the Intersil manufacturer datasheet, the device provides multiple operating modes for programmable interval timing. A typical controller writes a count or reload value, triggers a gate or control signal, and monitors the output or terminal-count status to determine completion. This approach is useful in sequencing, pulse-width generation, and periodic maintenance tasks. Verify the minimum valid count and the behavior of the selected mode. Also include output propagation delay and board-level clock uncertainty when setting a system-level timing tolerance.
داده‌های مرجع مهندسی برای CS82C54-12 — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | CS82C54-12Z | CS82C54 | CP82C54-12 | IP82C54Z | P82C54 |
|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Intel | Intel |
| Package | 28-pin PLCC (11.51 mm x 11.51 mm) | 28-pin PLCC (11.51 mm x 11.51 mm) | 28-pin PLCC (11.51 mm x 11.51 mm) | 28-pin PLCC (11.51 mm x 11.51 mm) | 28-pin PLCC (11.51 mm x 11.51 mm) | 28-pin PLCC (11.51 mm x 11.51 mm) |
| Device Type | CMOS programmable interval timer | Programmable timer IC | Programmable interval timer | 8254-compatible programmable timer | 8254-compatible programmable timer | 8254-compatible programmable timer |
| Number of Counters | 3 independent counters | 3 counters | 3 counters | 3 counters | 3 counters | 3 counters |
| Counter Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit |
| Supply Voltage | 4.5 V to 5.5 V | 5 V | 5 V | 5 V | 5 V | 5 V |
| Bus Interface | CMOS | CMOS | CMOS | CMOS | CMOS | CMOS |
تفاوت‌های کلیدی
- Directly identified 12 MHz timer rating in the exact order code (در مقابلP82C54)
- Documented 4.5 V to 5.5 V operating supply range (در مقابلCS82C54-12Z)
- Three independent 16-bit counters in one PLCC device (در مقابلIP82C54Z)
یادداشت‌های طراحی
Do not approve a replacement from the 8254-compatible family label alone. Compare the complete pin-description table, read/write-control timing, reset behavior, counter-mode semantics, maximum clock frequency, and supply limits. The CS82C54-12 is specified for 4.5 V to 5.5 V and a maximum 12 MHz clock input. Confirm that the alternative uses the same 28-pin PLCC footprint rather than a DIP or leaded-small-outline package.
Route the clock input as a short, controlled-impedance trace and keep it away from noisy switching nodes. The three counter inputs and bus signals should not share long unprotected paths with relay contacts, motors, or high-current switching edges. Use a ground plane for the device and connect bypass capacitance close to the supply pins. Because the PLCC footprint is through-hole, watch for excessive lead protrusion, solder bridging, and cleaning residue between closely spaced terminals.
Establish the complete timing budget when operating near the 12 MHz maximum clock frequency. Include clock rise and fall time, counter-control setup and hold requirements, output propagation delay, and the tolerance of the external oscillator. A nominal 12 MHz clock does not guarantee acceptable margin if its edges are slow or its duty cycle is outside the device limits. Measure the actual waveform at the timer pin and preserve the recommended supply decoupling near the package.
اطلاعات انطباق
The component is specified for 0 C to 70 C commercial-temperature operation. RoHS, REACH, lead-free, halogen-free, and conflict-minerals declarations are not stated in the available manufacturer and distributor information. AEC-Q100 is treated as not applicable because the device is a commercial-temperature 5 V timer rather than an automotive-qualified component.
