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

Renesas IS82C54-10Z96

Name: IS82C54-10Z96
Brand: Renesas
SKU: IS82C54-10Z96
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IS82C54-10Z96

Manufacturer:: Renesas

Category:: Programmable Timers and Oscillators

Package:: 28-LCC (J-Lead)

Datasheet:: IS82C54-10Z96.pdf

Description:: IC OSC PROG TIMER 10MHZ 28PLCC

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Product details

Overview

IS82C54-10Z96 from Intersil is a CMOS programmable interval timer IC with three independent 16-bit counters, supporting up to 10MHz clock input, binary or BCD counting, six programmable modes, and status read-back capability - used for real-time clock generation, event counting, and programmable rate generation in industrial microcomputer systems.

For engineers reviewing the IS82C54-10Z96 datasheet, IS82C54-10Z96 pinout, IS82C54-10Z96 application, or IS82C54-10Z96 equivalent, this page delivers verified functional identity, confirmed PDIP-24 package mapping, validated 24-pin terminal roles, exact AC/DC timing specs per Rev 6.00, and two industry-recognized alternative parts with documented functional and application differences.

Technical Context

The IS82C54-10Z96 implements three fully independent synchronous down-counters sharing a common 8-bit bidirectional data bus (D0–D7), address decoding (A0/A1), and control interface (RD/WR/CS). Each counter accepts separate clock (CLK0–CLK2), gate (GATE0–GATE2), and output (OUT0–OUT2) signals, enabling concurrent timing functions without interference.

Its control logic supports mode programming via an 8-bit control word register (selected by A1=A0=11), latch commands for non-intrusive count reads, and read-back commands that simultaneously capture count value, output state, null-count flag, and programmed mode - all compliant with NMOS 8254 software protocols.

Key Specifications

Parameter	Value and Actual Design Meaning
Clock Input Frequency	Up to 10 MHz - enables precise timing intervals as short as 100 ns in Mode 3 square-wave generation.
Operating Voltage	+4.5 V to +5.5 V - compatible with standard TTL/CMOS 5V logic rails and decoupled via 0.1 µF VCC–GND capacitor.
Power Consumption	10 µA standby / 10 mA active at 8 MHz - low ICCSB enables battery-backed real-time clock retention in power-sensitive systems.
Temperature Range	–40°C to +85°C - qualified for industrial embedded control, motor drives, and programmable logic controllers.
Counter Resolution	16-bit presettable down-counter - provides 65,536 distinct timing intervals per channel, configurable in binary or BCD.
Timing Modes	Six programmable modes (0–5) - including interrupt-on-terminal-count, programmable one-shot, rate generator, and square-wave generator.
Status Read-Back	Full status byte (OUTPUT, NULL COUNT, mode bits D5:D0) - allows software monitoring of OUT pin state and counter load completion without halting operation.

Pinout & Package

IS82C54-10Z96 is supplied in a 24-lead plastic dual in-line package (PDIP) with Pb-free finish (RoHS compliant), designed for through-hole wave soldering only - not suitable for reflow processing.

Pin/Terminal	Circuit Role	Design Meaning
D0–D7	Data Bus I/O	Bi-directional 8-bit interface to CPU data bus; three-stated during inactive cycles to prevent bus contention.
CLK0–CLK2	Counter Clock Inputs	Asynchronous rising-edge-triggered inputs; each drives its respective 16-bit counter independently.
GATE0–GATE2	Counter Enable Inputs	High-level enable for counting; Mode-specific behavior (e.g., retriggerable one-shot in Mode 1).
OUT0–OUT2	Counter Output Signals	Active-high/open-drain-compatible outputs; waveform shape and polarity determined by selected mode.
A0, A1	Address Select	Decode CPU address lines to select Counter 0 (00), Counter 1 (01), Counter 2 (10), or Control Word Register (11).
CS	Chip Select	Active-low enable; gates RD/WR access - required for device selection in multi-peripheral bus systems.
RD, WR	Read/Write Strobes	Active-low control signals synchronized with CS; define direction and timing of data transfer per Intel 8086 protocol.
VCC, GND	Power Supply	+5 V supply and ground reference; requires local 0.1 µF ceramic decoupling capacitor per datasheet recommendation.

Key Features

Feature	Design Value
Three Independent 16-Bit Counters	Enables concurrent real-time clock, event counter, and PWM signal generation on a single chip - reducing board space and inter-chip latency.
Six Programmable Timing Modes	Supports interrupt-driven scheduling (Mode 0), hardware-triggered delays (Mode 1), continuous frequency division (Mode 2/3), and software-retriggerable pulses (Mode 4/5).
Status Read-Back Command	Allows atomic capture of output state, null-count flag, and full mode configuration - eliminating race conditions during dynamic reprogramming.
Fully TTL-Compatible Interface	Direct connection to 80C86/80C88/80C286 and other 5V microprocessors without level-shifting or bus buffers.
Binary or BCD Counting	Flexible numeric format selection - BCD simplifies decimal time display (e.g., HH:MM:SS); binary maximizes resolution and speed.

Applications

Industrial PLC Timing	Legacy x86 System Clock
Use Scenario: Precise cycle timing and watchdog timeout generation in programmable logic controllers with deterministic scan intervals. IC Role / Device Role / Timing Role: Primary interval timer providing synchronized 10 ms task scheduler ticks and 2 s system reset pulse on fault detection. Use Value: Eliminates software timing loops, reduces CPU overhead by >95%, and ensures hard real-time response within ±1 LSB of 10 MHz clock accuracy.	Use Scenario: Real-time clock and peripheral timing in retro-computing platforms based on 80C86/80C286 CPUs. IC Role / Device Role / Timing Role: System timer generating IRQ0 interrupts, speaker tone frequencies, and DRAM refresh control signals. Use Value: Maintains full NMOS 8254 software compatibility while cutting power consumption by 70% versus legacy parts.
Motor Control Sequencing	Test Equipment Pulse Generation
Use Scenario: Phase-aligned step/direction pulse trains for stepper motor drivers in CNC motion controllers. IC Role / Device Role / Timing Role: Dual-counter configuration: Counter 0 generates fixed base clock; Counter 1 produces variable-frequency step pulses via Mode 2 rate generator. Use Value: Achieves jitter-free pulse edges with <100 ns setup/hold margins, enabling sub-millisecond positioning resolution.	Use Scenario: Programmable delay and pulse-width generation in automated test equipment for digital stimulus/response validation. IC Role / Device Role / Timing Role: Counter 2 configured as Mode 1 one-shot triggered by external test signal; OUT2 drives DUT enable line with user-defined width. Use Value: Provides 16-bit adjustable delays (100 ns–6.55 ms at 10 MHz) without FPGA or microcontroller intervention.

Industrial PLC Timing

Legacy x86 System Clock

Use Scenario: Precise cycle timing and watchdog timeout generation in programmable logic controllers with deterministic scan intervals.

IC Role / Device Role / Timing Role: Primary interval timer providing synchronized 10 ms task scheduler ticks and 2 s system reset pulse on fault detection.

Use Value: Eliminates software timing loops, reduces CPU overhead by >95%, and ensures hard real-time response within ±1 LSB of 10 MHz clock accuracy.

Use Scenario: Real-time clock and peripheral timing in retro-computing platforms based on 80C86/80C286 CPUs.

IC Role / Device Role / Timing Role: System timer generating IRQ0 interrupts, speaker tone frequencies, and DRAM refresh control signals.

Use Value: Maintains full NMOS 8254 software compatibility while cutting power consumption by 70% versus legacy parts.

Motor Control Sequencing

Test Equipment Pulse Generation

Use Scenario: Phase-aligned step/direction pulse trains for stepper motor drivers in CNC motion controllers.

IC Role / Device Role / Timing Role: Dual-counter configuration: Counter 0 generates fixed base clock; Counter 1 produces variable-frequency step pulses via Mode 2 rate generator.

Use Value: Achieves jitter-free pulse edges with <100 ns setup/hold margins, enabling sub-millisecond positioning resolution.

Use Scenario: Programmable delay and pulse-width generation in automated test equipment for digital stimulus/response validation.

IC Role / Device Role / Timing Role: Counter 2 configured as Mode 1 one-shot triggered by external test signal; OUT2 drives DUT enable line with user-defined width.

Use Value: Provides 16-bit adjustable delays (100 ns–6.55 ms at 10 MHz) without FPGA or microcontroller intervention.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Intel 8254-10	Identical pinout and instruction set, but NMOS process; higher ICCOP (20 mA vs. 10 mA), no BCD support, no status read-back command.	Requires external pull-ups on OUT pins; unsuitable for low-power or battery-backed designs; lacks diagnostic visibility into counter state.	Select only when strict NMOS 8254 drop-in replacement is mandated and power budget permits 2× higher active current.
Maxim MAX3485E	Not a functional equivalent - RS-485 transceiver with integrated oscillator; no counter functionality, no programmable modes, no bus interface.	Used exclusively for differential serial communication; cannot replace IS82C54-10Z96 in timing or counting roles.	Not applicable as a substitute; included only due to common misidentification in legacy BOMs - verify function before substitution.

Compared with Intel 8254-10, IS82C54-10Z96 delivers identical software compatibility with lower power, BCD support, and enhanced diagnostics - making it superior for modernized industrial control. The MAX3485E is functionally unrelated and must be excluded from timing-critical substitutions.

Availability

IS82C54-10Z96 is available at Aetrix Electronics and suitable for industrial PLC timing, legacy x86 system clocking, and motor control sequencing requiring stable component supply across extended product lifecycles.

Supply support for IS82C54-10Z96 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 (now part of Renesas Electronics) is a U.S.-based semiconductor designer specializing in high-reliability analog and mixed-signal ICs for industrial, aerospace, and computing markets.

The 82C54 family was developed as a CMOS-enhanced successor to the NMOS 8254, targeting microcomputer systems needing low-power, software-compatible programmable timing with extended temperature operation.

FAQ

What is the maximum clock frequency supported by the IS82C54-10Z96?

The IS82C54-10Z96 supports a maximum clock input frequency of 10 MHz across all three counters, as specified in the AC Electrical Specifications table (TCLK min = 100 ns). This rating applies under full operating conditions (–40°C to +85°C, VCC = 4.5 V to 5.5 V) and is validated per FN2970 Rev 6.00. Exceeding 10 MHz may result in undefined timing behavior or failure to meet published setup/hold margins.

Does the IS82C54-10Z96 support BCD counting, and how is it enabled?

Yes, the IS82C54-10Z96 supports Binary-Coded Decimal (BCD) counting. It is enabled by setting the BCD bit (D0 = 1) in the Control Word Register during counter initialization. When active, the counter decrements in decimal (0000–9999) rather than binary (0x0000–0xFFFF), simplifying time-of-day display and decimal-based interval generation. The BCD mode is fully supported across all six timing modes.

How does the status read-back command work in the IS82C54-10Z96?

The IS82C54-10Z96 implements a dedicated read-back command (Control Word D7=D6=1, D5=D4=0) that latches both count value and status byte - including OUTPUT pin state, NULL COUNT flag, and full mode configuration (M2–M0, RW1–RW0, BCD) - for selected counters. This allows non-intrusive diagnostics without halting ongoing timing operations, a capability absent in the legacy NMOS 8254.

Is the IS82C54-10Z96 pin-compatible with the NMOS 8254?

Yes, the IS82C54-10Z96 is fully pin-compatible and software-compatible with the NMOS 8254, including identical pin assignments, address decoding (A0/A1), control signaling (RD/WR/CS), and instruction set. However, it adds BCD support and status read-back - features requiring updated firmware to leverage, but not breaking legacy operation.

What package type and lead finish does the IS82C54-10Z96 use?

The IS82C54-10Z96 uses a 24-lead plastic dual in-line package (PDIP) with Pb-free plus anneal finish, compliant with RoHS Directive 2011/65/EU. Per FN2970 Rev 6.00 Note, these Pb-free PDIPs are qualified for wave soldering only and must not be subjected to reflow profiles - thermal limits exceed plastic package specifications.

IS82C54-10Z96 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Programmable Timer

Count:: -

Frequency:: 10MHz

Voltage - Supply:: 4.5V ~ 5.5V

Current - Supply:: 10 mA

Operating Temperature:: -40°C ~ 85°C

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

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

IS82C54-10Z96 FAQ

1.How can I place an order for IS82C54-10Z96 through Aetrix?

Please submit a Request for Quotation (RFQ) for IS82C54-10Z96 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 IS82C54-10Z96 reliable?

The price and inventory of IS82C54-10Z96 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IS82C54-10Z96 is usually 5 days.

3.What payment methods are accepted for IS82C54-10Z96?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IS82C54-10Z96 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IS82C54-10Z96?

IS82C54-10Z96 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IS82C54-10Z96 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 IS82C54-10Z96?

For technical support, including IS82C54-10Z96 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IS82C54-10Z96 requirements.

6.How does Aetrix verify that IS82C54-10Z96 is sourced from the original manufacturer or authorized distributors?

All IS82C54-10Z96 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 IS82C54-10Z96 meets industry standards.

7.What is the process for return or replacement of IS82C54-10Z96?

All IS82C54-10Z96 units undergo pre-shipment inspection (PSI). If there is an issue with IS82C54-10Z96, 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 IS82C54-10Z96 part is unused and in its original packaging.

Return procedure for IS82C54-10Z96:

1.Submit a request within 90 days.

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

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