Renesas IP82C54-10

Overview

IP82C54-10 from Intersil is a CMOS programmable interval timer IC with three independent 16-bit counters, supporting up to 10 MHz clock input frequency, TTL-compatible 5 V operation, and six programmable timing modes - used for real-time clock generation, event counting, and programmable rate generation in industrial microcomputer systems.

For engineers reviewing the IP82C54-10 datasheet, IP82C54-10 pinout, IP82C54-10 application, or IP82C54-10 equivalent, this device serves as a drop-in CMOS upgrade to the NMOS 8254 with lower power consumption, extended temperature range (–40°C to +85°C), and full software compatibility with legacy 80C86/80C88-based control systems.

Technical Context

The IP82C54-10 implements three fully independent 16-bit synchronous down counters, each configurable via an 8-bit control word register that defines mode (0–5), count format (binary/BCD), and read/write sequence. Its static CMOS architecture enables zero-power standby (10 µA) while maintaining deterministic timing behavior across its –40°C to +85°C operating range.

It interfaces directly to 8-bit data buses using standard RD/WR/CS control signals and A0/A1 address lines, with dedicated CLK/GATE/OUT pins per counter. The Read-Back command allows simultaneous status and count latching without halting operation - critical for real-time monitoring in embedded timing applications.

Key Specifications

Pinout & Package

IP82C54-10 is supplied in a 24-lead plastic dual in-line package (PDIP), RoHS-compliant with matte tin termination, rated for through-hole wave solder only (not reflow-compatible).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IP82C54-10, the IP82C54-10Z offers identical functionality with RoHS compliance but restricts assembly to wave soldering, while IS82C54-10 enables SMT placement at the cost of full PCB redesign - making IP82C54-10 the preferred choice for drop-in replacement in existing industrial DIP-based systems.

Availability

IP82C54-10 is available at Aetrix Electronics and suitable for industrial motor control, legacy microprocessor timing, and programmable logic controller applications requiring stable component supply and long-term lifecycle support.

Supply support for IP82C54-10 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 (now part of Renesas Electronics) is a semiconductor company specializing in high-performance analog and mixed-signal ICs for industrial, aerospace, and computing markets.

The 82C54 family was designed as a CMOS-enhanced, pin-compatible successor to the industry-standard 8254 timer - delivering lower power, wider temperature range, and full software compatibility for embedded timing subsystems.

FAQ

What is the maximum clock frequency supported by the IP82C54-10?

The IP82C54-10 supports a maximum clock input frequency of 10 MHz, as confirmed in the AC Electrical Specifications table (TCLK min = 100 ns). This enables timing resolution down to 100 ns and is validated across the full –40°C to +85°C operating range. Higher-frequency variants (e.g., IP82C54-12) are not interchangeable without timing validation.

Is the IP82C54-10 pin-compatible with the original NMOS 8254?

Yes, the IP82C54-10 is fully pin-compatible and functionally equivalent to the NMOS 8254, as explicitly stated in the datasheet's "Compatible with NMOS 8254" feature list. All 24-pin assignments, control signal timing, and programming sequences match - enabling direct replacement in legacy 8080/8086 systems without hardware modification.

Does the IP82C54-10 support BCD counting mode?

Yes, the IP82C54-10 supports Binary-Coded Decimal (BCD) counting, selectable via the BCD bit (D0) in the control word. When set, the counter operates in 4-decade (0000–9999) decimal format - essential for direct interface with 7-segment displays or decimal arithmetic firmware without software conversion.

What is the standby current consumption of the IP82C54-10?

The IP82C54-10 draws only 10 µA in standby (ICCSB), measured at VCC = 5.5 V with all inputs at GND or VCC and counters programmed. This ultra-low quiescent current enables energy-efficient operation in always-on industrial timers and battery-buffered real-time clocks.

Can the IP82C54-10 generate square-wave outputs?

Yes, the IP82C54-10 can generate precise square-wave outputs using Mode 3 (square-wave generator). In this mode, the OUT pin toggles at exactly half the input clock frequency - e.g., a 10 MHz CLK produces a 5 MHz square wave - with symmetrical duty cycle and minimal jitter due to static CMOS design.