Analog Devices Inc./Maxim Integrated DS80C323-END+

Overview

DS80C323-END+ from Maxim Integrated is a high-speed, low-power 80C32-compatible 8-bit microcontroller featuring 4-clock-per-machine-cycle architecture, 18MHz max crystal frequency, -40°C to +85°C industrial temperature range, 256 bytes on-chip RAM, and dual hardware serial ports. It serves as a drop-in upgrade in legacy 8051-based industrial control, instrumentation, and embedded communication systems requiring extended voltage operation.

For engineers reviewing the DS80C323-END+ datasheet, DS80C323-END+ pinout, DS80C323-END+ application, or DS80C323-END+ equivalent, this page delivers verified electrical specs, validated TQFP-44 package mapping, confirmed dual-serial-port timing behavior, and real-world substitution guidance for 80C32 migration projects - all grounded in Maxim's official documentation and ordering data.

Technical Context

The DS80C323-END+ implements a redesigned 8051 core executing most instructions in 4 oscillator cycles (vs. 12 in standard 80C32), delivering ~2.5× average speedup without code changes. Its dual data pointer (DPTR0/DPTR1) enables zero-overhead block memory moves, while programmable MOVX stretch (2–9 machine cycles) allows seamless interfacing with slow peripherals like LCD controllers or legacy SRAM.

It integrates power-fail reset, early-warning power-fail interrupt, and programmable watchdog timer - all accessible via dedicated SFRs (e.g., CKCON at 8Eh, DPS at 86h). Timer/counter operation defaults to 12-cycle mode for backward compatibility but can be reconfigured to 4-cycle mode via CKCON bits for higher-resolution timing.

Key Specifications

Pinout & Package

DS80C323-END+ is packaged in a 44-pin Thin Quad Flat Package (TQFP) with 0.8mm lead pitch, RoHS-compliant, and rated for -40°C to +85°C operation. Pin functions are identical across DS80C320/DS80C323 family variants in matching packages.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8051-compatible microcontroller applications.

Compared with DS80C320-ENL+, DS80C323-END+ trades maximum clock speed for wider voltage range and lower power - critical for battery-backed or mixed-supply systems. Versus AT89C51RD2-RLTUM, it sacrifices on-chip Flash for superior peripheral integration, deterministic timing control, and industrial-grade power resilience.

Availability

DS80C323-END+ is available at Aetrix Electronics and suitable for industrial automation, smart metering, medical diagnostics, and automotive body electronics requiring stable component supply across extended temperature and voltage ranges.

Supply support for DS80C323-END+ 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

Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in precision analog, mixed-signal, and high-reliability microcontrollers for industrial, medical, and automotive applications.

The DS80C323-END+ belongs to Maxim's high-speed 8051-compatible microcontroller family, designed specifically to extend legacy 80C32 systems with enhanced speed, low-voltage operation, and integrated system-level features like power-fail management.

FAQ

What is the operating voltage range of the DS80C323-END+?

The DS80C323-END+ operates from 2.7V to 5.5V, making it compatible with both 3.3V and 5V systems without level shifters. This wide range supports battery-powered devices and mixed-voltage industrial designs where supply rails may dip during transient conditions - a key differentiator from the 4.25V–5.5V-only DS80C320 variants. DS80C323-END+ maintains full functionality across its entire voltage range at -40°C to +85°C.

Does the DS80C323-END+ include on-chip program memory?

No, the DS80C323-END+ does not contain on-chip ROM or Flash memory. It relies entirely on external program memory accessed via the multiplexed P0 address/data bus and P2 high-order address lines. This architecture matches the original 80C32 and enables flexible memory sizing - designers select appropriate EPROM, EEPROM, or NOR Flash based on application requirements. DS80C323-END+ provides 256 bytes of on-chip scratchpad RAM only.

How does the dual data pointer improve performance in the DS80C323-END+?

The DS80C323-END+ implements two independent 16-bit data pointers (DPTR0 at 82h/83h and DPTR1 at 84h/85h), selected via the DPS bit at SFR 86h. This eliminates the need to save/restore address registers during block memory moves - for example, a 64-byte RAM-to-RAM copy executes in 1097 machine cycles instead of 1869. DS80C323-END+ leverages this to accelerate firmware updates, display buffer refreshes, and sensor data aggregation without additional CPU overhead.

Can the DS80C323-END+ replace a standard 80C32 in an existing design?

Yes, the DS80C323-END+ is pin-compatible and instruction-set-compatible with the 80C32 in the same 44-pin TQFP package. Software written for the 80C32 runs unchanged, though timing-critical loops may require adjustment due to the 4-clock-per-cycle core. DS80C323-END+ retains identical SFR layout and peripheral register addresses, and its timers default to 12-cycle mode on reset to preserve legacy baud rates and interrupt intervals.

What is the purpose of the MOVX stretch feature in the DS80C323-END+?

The MOVX stretch feature in the DS80C323-END+ allows software to configure external data memory access timing from 2 to 9 machine cycles via CKCON.2–0 bits. This enables reliable interfacing with slow peripherals - such as character LCDs, legacy SRAM, or I/O expanders - without external wait-state logic. DS80C323-END+ uses this to simplify BOMs and PCB layouts while maintaining deterministic timing across diverse memory speeds.