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Renesas CP82C54-12Z
- Part No.:
- CP82C54-12Z
- Manufacturer:
- Renesas
- Category:
- Programmable Timers and Oscillators
- Package:
- 24-DIP (0.600", 15.24mm)
- Datasheet:
-
CP82C54-12Z.pdf
- Description:
- IC OSC PROG TIMER 12MHZ 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,375
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Product details
Overview
CP82C54-12Z from Intersil is a CMOS programmable interval timer IC with three independent 16-bit counters, 12MHz maximum clock input frequency, binary/BCD counting capability, six programmable timing modes, and full TTL compatibility - used for real-time clock generation, event counting, and programmable rate generation in legacy x86 embedded systems.
For engineers reviewing the CP82C54-12Z datasheet, CP82C54-12Z pinout, CP82C54-12Z application, or CP82C54-12Z equivalent, this page delivers verified functional identity, validated PDIP-24 pin mapping, confirmed 12MHz timing performance, exact counter mode behavior, and two industry-validated alternative parts for legacy system maintenance and redesign.
Technical Context
The CP82C54-12Z implements three fully independent 16-bit synchronous down counters, each accepting clock inputs up to 12MHz and supporting six distinct operational modes (Mode 0–5) for interrupt-on-terminal-count, programmable one-shot, rate generator, square-wave generator, software-triggered strobe, and hardware-retriggerable one-shot functions. Its control logic decodes A0/A1 address lines to select Counter 0/1/2 or the Control Word Register, enabling mode configuration and count loading via an 8-bit bidirectional data bus.
It features a status read-back command that latches both counter output values and internal status flags (OUT state, null count flag, programmed mode), allowing non-intrusive runtime monitoring without halting counting operations. The device operates on a single +5V supply (4.5V–5.5V), draws only 10µA in standby, and maintains full compatibility with NMOS 8254 and 8253 timers while delivering lower power consumption.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Clock Input | 12MHz - enables precise timing intervals as short as 83.3ns per tick in high-speed legacy microprocessor systems. |
| Counter Width | 16-bit - supports timing ranges up to 65,536 clock cycles per count, sufficient for millisecond-to-second delays at 12MHz. |
| Supply Voltage | +4.5V to +5.5V - ensures robust operation across industrial-grade 5V rail tolerances without external regulation. |
| Standby Current | 10µA - allows low-power sleep states in battery-backed or energy-sensitive embedded timer applications. |
| Operating Temp | 0°C to +70°C - certified for commercial-temperature environments typical of desktop PCs and industrial controllers. |
| Package | 24-Lead PDIP - through-hole mounting compatible with legacy PCB assembly and socket-based prototyping. |
| Logic Compatibility | Fully TTL-compatible I/O - interfaces directly with 80C86, 80C88, and other CMOS/NMOS microprocessors without level-shifting. |
Pinout & Package
CP82C54-12Z is housed in a 24-lead plastic dual in-line package (PDIP), pin-compatible with industry-standard 8253/8254 timers and suitable for wave-soldered through-hole assembly. Pin functions are electrically and physically identical across all speed grades (8/10/12MHz) within the CP82C54 family.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D7 | Data Bus I/O | Bidirectional 8-bit interface to CPU data bus; three-state outputs enable shared bus arbitration. |
| CLK 0–2 | Counter Clock Inputs | Independent asynchronous clock sources for each 16-bit counter; accept up to 12MHz TTL-level signals. |
| GATE 0–2 | Counter Enable Inputs | Active-high gating controls counting enable/disable per counter; supports hardware-triggered timing sequences. |
| OUT 0–2 | Counter Output Signals | Open-collector compatible outputs reflecting counter state (e.g., terminal count pulse or square wave). |
| A0, A1 | Counter Address Select | Binary-encoded selection of Counter 0/1/2 or Control Word Register during read/write cycles. |
| CS, RD, WR | Control Interface | Standard 8086-style chip select, read, and write strobes - no glue logic required for x86 bus interfacing. |
| VCC, GND | Power Supply | +5V supply and ground pins; decoupling capacitor recommended at VCC–GND per datasheet layout guidance. |
Key Features
| Feature | Design Value |
|---|---|
| Status Read-Back Command | Enables simultaneous latching of counter output value, OUT pin state, null count flag, and programmed mode - critical for debug and fault-tolerant timing supervision. |
| Six Programmable Modes | Supports Mode 0 (interrupt-on-terminal-count), Mode 2 (rate generator), Mode 3 (square wave), Mode 4 (software-triggered strobe), and Mode 5 (hardware-triggered strobe) - eliminates need for external timing logic. |
| Binary or BCD Counting | Configurable 16-bit binary or 4-decade BCD counting - essential for time-of-day clocks and decimal display interfaces. |
| Static CMOS Design | Zero dynamic power during idle states and 10µA ICCSB - reduces thermal load and extends battery life in portable legacy systems. |
| NMOS 8254 Compatibility | Pin- and function-compatible drop-in replacement for Intel 8254 - enables direct upgrade of aging systems without PCB revision. |
Applications
| Real-Time Clock (RTC) | Event Counter |
|---|---|
Use Scenario: Maintaining wall-clock time in PC AT-class motherboards using ISA bus timing resources. IC Role / Device Role / Timing Role: Counter 0 configured in Mode 3 (square wave) drives system timer interrupt (IRQ0) at 18.2Hz; Counter 2 generates speaker tone control. Use Value: Provides deterministic, software-independent timekeeping with sub-millisecond resolution and zero CPU overhead during counting. |
Use Scenario: Measuring RPM of industrial motor shafts via optical encoder pulses in PLC I/O modules. IC Role / Device Role / Timing Role: Counter 1 in Mode 0 (interrupt-on-terminal-count) accumulates encoder edges; triggers interrupt after preset count to compute rotation period. Use Value: Enables precise, jitter-free edge counting up to 12MHz without CPU polling or FPGA logic. |
| Programmable Rate Generator | Digital One-Shot |
Use Scenario: Generating variable-frequency clock signals for legacy DACs or serial UART baud rate derivation. IC Role / Device Role / Timing Role: Counter 2 in Mode 2 (rate generator) produces periodic output pulses; frequency set by loaded count value and CLK2 input. Use Value: Delivers stable, software-programmable output frequencies from Hz to 12MHz with ±1-clock-cycle accuracy. |
Use Scenario: Creating precise, repeatable delay pulses for memory refresh control or peripheral reset sequencing. IC Role / Device Role / Timing Role: Counter 0 in Mode 1 (programmable one-shot) triggered by GATE0 rising edge; OUT0 goes low for N+1 clock cycles. Use Value: Guarantees exact, temperature-stable delay durations independent of CPU execution timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable timer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Intel 8254-12 | Identical pinout, function, and AC specs; NMOS process, higher ICCOP (20mA vs. 10mA), no Pb-free option. | Same legacy x86 timing roles but higher power dissipation and obsolete manufacturing. | Select only if RoHS compliance is not required and existing NMOS board population must be maintained. |
| ICS82C54-12Z | Functionally identical CMOS design; same 12MHz rating, PDIP-24 package, and Intersil-compatible timing specs. | Drop-in replacement with identical footprint and electrical behavior; manufactured under updated quality controls. | Preferred for new builds requiring guaranteed long-term availability and RoHS-compliant sourcing. |
Compared with Intel 8254-12 and ICS82C54-12Z, the CP82C54-12Z offers identical timing functionality and pin compatibility but delivers half the operating current (10mA vs. 20mA) and guaranteed Pb-free compliance - making it optimal for power-constrained or environmentally regulated legacy upgrades.
Availability
CP82C54-12Z is available at Aetrix Electronics and suitable for real-time clock generation, industrial event counting, programmable rate generation, and digital one-shot applications requiring stable component supply across extended product lifecycles.
Supply support for CP82C54-12Z 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 precision analog, power management, and timing ICs before its acquisition by Renesas Electronics in 2017.
The CP82C54-12Z belongs to Intersil's legacy CMOS timer product line, designed specifically to replace NMOS 8253/8254 timers in 5V microprocessor systems while reducing power and improving reliability.
FAQ
What is the maximum clock frequency supported by the CP82C54-12Z?
The CP82C54-12Z supports a maximum clock input frequency of 12MHz across all three counters, as confirmed by AC Electrical Specifications Table on Page 4 of FN2970 Rev 6.00. This corresponds to a minimum clock period of 80ns and enables timing resolution down to 83.3ns per count step. The "-12" suffix explicitly denotes this speed grade, distinguishing it from the -8 and -10 variants.
Is the CP82C54-12Z pin-compatible with the Intel 8254?
Yes, the CP82C54-12Z is fully pin-compatible and functionally equivalent to the Intel 8254-12, including identical pin assignments, signal definitions, and control protocol. Datasheet Section "Features" explicitly states "Compatible with NMOS 8254", and the Pin Description table (Page 5) matches Intel's 8254 pinout exactly - enabling direct replacement in existing 8254-based designs without PCB modification.
Does the CP82C54-12Z support BCD counting mode?
Yes, the CP82C54-12Z supports Binary-Coded Decimal (BCD) counting when the BCD bit (D0) in the Control Word is set to '1'. In this mode, each counter operates as a 4-decade (0000–9999) decimal counter instead of a 16-bit binary counter (0–65535). This capability is documented in the Control Word Format table (Page 8) and enables direct integration with decimal displays and time-of-day applications.
What package type is used for the CP82C54-12Z?
The CP82C54-12Z uses a 24-lead plastic dual in-line package (PDIP), as specified in the Ordering Information table (Page 2) under "CP82C54-12Z" with "24 Lead PDIP** (Pb-free)" and package drawing E24.6. This through-hole package is RoHS-compliant (Pb-free plus anneal) and intended for wave solder processing only, not reflow.
Can the CP82C54-12Z operate from a 3.3V supply?
No, the CP82C54-12Z requires a +5V nominal supply with a specified operating range of +4.5V to +5.5V, as stated in the "Operating Conditions" section (Page 3). It is not rated for 3.3V operation, and attempting to power it from 3.3V will result in undefined logic levels, failure to meet AC timing specifications, and potential functional failure. Level-shifting circuitry is required for interfacing with 3.3V systems.
CP82C54-12Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 24-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Programmable Timer
- Count:
- -
- Frequency:
- 12MHz
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Supply:
- 10 mA
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
CP82C54-12Z FAQ
1.How can I place an order for CP82C54-12Z through Aetrix?
Please submit a Request for Quotation (RFQ) for CP82C54-12Z 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 CP82C54-12Z reliable?
The price and inventory of CP82C54-12Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CP82C54-12Z is usually 5 days.
3.What payment methods are accepted for CP82C54-12Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CP82C54-12Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CP82C54-12Z?
CP82C54-12Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CP82C54-12Z 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 CP82C54-12Z?
For technical support, including CP82C54-12Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CP82C54-12Z requirements.
6.How does Aetrix verify that CP82C54-12Z is sourced from the original manufacturer or authorized distributors?
All CP82C54-12Z 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 CP82C54-12Z meets industry standards.
7.What is the process for return or replacement of CP82C54-12Z?
All CP82C54-12Z units undergo pre-shipment inspection (PSI). If there is an issue with CP82C54-12Z, 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 CP82C54-12Z part is unused and in its original packaging.
Return procedure for CP82C54-12Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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