Renesas CP80C88Z

Overview

CP80C88Z from Intersil is a static CMOS 8-/16-bit microprocessor with 8-bit external data bus and 16-bit internal architecture, operating up to 5 MHz, supporting 1 MB memory addressing, 24 operand addressing modes, and TTL-compatible bus interface (excluding CLOCK). It serves as a low-power, drop-in software-compatible replacement for NMOS 8088 in embedded control and industrial computing systems.

For engineers reviewing the CP80C88Z datasheet, CP80C88Z pinout, CP80C88Z application, or CP80C88Z equivalent, this page delivers verified electrical specs, minimum/maximum mode configuration details, bus-hold circuitry behavior, static operation support, and precise 40-pin PDIP package mapping - all critical for legacy system refresh, power-constrained designs, and long-lifecycle industrial deployments.

Technical Context

The CP80C88Z implements a dual-unit architecture: a Bus Interface Unit (BIU) with 4-byte instruction queue and an Execution Unit (EU) handling decoding and ALU operations, enabling instruction prefetch overlap to improve bus utilization. Its static CMOS design allows DC-to-5 MHz operation with clock halt capability for debug and ultra-low-power states.

It supports two configurable bus modes: Minimum mode (MN/MX = V_CC) for single-processor systems using ALE, DEN, DT/R, and IO/M for direct peripheral control; and Maximum mode (MN/MX = GND) for multiprocessor environments requiring 82C88 bus controller coordination via S0–S2, RQ/GT0/1, and LOCK signals.

Key Specifications

Pinout & Package

CP80C88Z is housed in a 40-lead plastic dual-in-line package (PDIP) per Intersil drawing E40.6, with 0.6-inch body width and standard 0.1-inch lead pitch. Pin 1 is bottom-left corner when notch faces up; pins numbered counter-clockwise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CP80C88-2Z, CP80C88Z offers lower dynamic power and guaranteed 5 MHz timing margin; compared with HD64188, it delivers static operation, bus-hold, and RoHS compliance - making it the preferred choice for new designs requiring longevity, power control, and regulatory alignment.

Availability

CP80C88Z is available at Aetrix Electronics and suitable for industrial PLC controllers, legacy medical instrumentation, ruggedized data acquisition terminals, avionics maintenance test sets, and embedded HMI systems requiring stable component supply across multi-year production cycles.

Supply support for CP80C88Z 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 high-performance analog and mixed-signal ICs, later acquired by Renesas Electronics in 2017. Known for robust industrial-grade timing and interface solutions.

The 80C88 product line was designed as a CMOS upgrade path for 8088-based systems, emphasizing static operation, low power, software compatibility, and extended temperature reliability for mission-critical embedded control.

FAQ

What is the maximum operating frequency of the CP80C88Z?

The CP80C88Z is rated for a maximum clock frequency of 5 MHz, as specified in the Intersil FN2949 Rev.5.00 datasheet. This rating applies across its full commercial temperature range (0°C to +70°C) and ensures reliable instruction execution, bus timing, and interrupt response without derating. The CP80C88Z must not be operated above this frequency, as timing violations may occur in address setup, data hold, or control signal synchronization.

Does the CP80C88Z support static (zero-frequency) operation?

Yes, the CP80C88Z supports true static CMOS operation down to DC. Its internal registers and latches require no refresh, allowing the CLK signal to be halted indefinitely in either high or low state. This capability enables ultra-low-power standby modes, deterministic single-stepping for debug, and precise timing control in real-time systems - all confirmed in the "Static Operation" section of the FN2949 datasheet.

What package type and lead finish does the CP80C88Z use?

The CP80C88Z uses a 40-lead plastic dual-in-line package (PDIP) per Intersil package drawing E40.6. It features 100% matte tin (e3) termination finish, RoHS-compliant, and qualified for both SnPb and Pb-free soldering processes. The package is not moisture-sensitive (MSL exempt) and supports standard through-hole assembly and reflow profiles per IPC/JEDEC J-STD-020.

How does the CP80C88Z differ from the NMOS 8088 in terms of power consumption?

The CP80C88Z draws ≤500 µA in standby (ICCSB) and ≤10 mA/MHz during active operation (ICCOP), significantly lower than the NMOS 8088's typical 10–15 mA/MHz and ~2 mA standby. This reduction stems from its self-aligned silicon gate CMOS process and integrated bus-hold circuitry, which eliminates external pull-up resistors - directly lowering total system power in battery-backed or thermally constrained applications.

Can the CP80C88Z replace an NMOS 8088 without hardware changes?

Yes - the CP80C88Z is pin-compatible and electrically compatible with the NMOS 8088 in Minimum mode, except for the CLOCK input (which has asymmetric 33% duty cycle) and absence of pull-up requirements due to built-in bus-hold. All control, address, and data signals match timing and voltage levels. However, clock generator and decoupling must meet CP80C88Z's specific requirements per FN2949 Section 17.