Analog Devices Inc./Maxim Integrated DS80C323-ECD+T&R

Overview

DS80C323-ECD+T&R from Maxim Integrated is a high-speed, low-voltage 80C32-compatible 8-bit microcontroller featuring 4-clock-per-machine-cycle architecture, 18MHz max crystal frequency, 256 bytes on-chip RAM, dual hardware serial ports, and programmable watchdog timer. It operates from 2.7V to 5.5V and targets legacy 8051 upgrade paths in industrial control, embedded instrumentation, and power management systems.

For engineers reviewing the DS80C323-ECD+T&R datasheet, DS80C323-ECD+T&R pinout, DS80C323-ECD+T&R application, or DS80C323-ECD+T&R equivalent, key selection considerations include its 4-clock core timing compatibility with legacy 80C32 code, variable MOVX memory access stretch (2–9 cycles), dual data pointer for block transfers, 2.7–5.5V supply range, and TQFP-44 package footprint.

Technical Context

The DS80C323-ECD+T&R implements a redesigned 8051-compatible core executing most instructions in 4 oscillator cycles-three times faster than standard 80C32 at identical crystal frequencies. Its dual data pointer (DPTR0/DPTR1) enables zero-overhead switching between source and destination addresses during memory moves.

Timer/counter operation defaults to 12-clock mode for backward compatibility but supports 4-clock mode via CKCON register bits; serial port 0 uses P3.0/P3.1, while serial port 1 uses P1.2/P1.3. Memory access timing is configurable via CKCON.2–0 (stretch values 0–7), enabling direct interface to both fast SRAM and slow peripherals without glue logic.

Key Specifications

Pinout & Package

DS80C323-ECD+T&R is housed in a 44-pin Thin Quad Flat Package (TQFP) with 0.8mm lead pitch and exposed thermal pad. Pin assignments follow standard 80C32 layout with enhancements for dual serial I/O and extended interrupts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS80C320-ECL+, DS80C323-ECD+T&R trades maximum clock speed for wider voltage range and lower power - essential for portable designs. Against AT89C51RD2-RLTUM, it prioritizes external memory scalability and deterministic real-time peripherals over integrated Flash, making it better suited for systems requiring >64kB code space or legacy ROM-based bootloaders.

Availability

DS80C323-ECD+T&R is available at Aetrix Electronics and suitable for industrial automation, smart metering, medical device control, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for DS80C323-ECD+T&R 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 communications applications.

The DS80C323-ECD+T&R belongs to Maxim's high-speed 8051-compatible microcontroller family, designed specifically to extend legacy 80C32 designs with enhanced timing performance, low-voltage operation, and integrated system-level features like dual UARTs and power-fail management.

FAQ

What is the operating voltage range of the DS80C323-ECD+T&R?

The DS80C323-ECD+T&R operates from 2.7V to 5.5V, supporting both battery-powered and standard 5V industrial systems. This wider range differentiates it from the DS80C320, which requires minimum 4.25V. The DS80C323-ECD+T&R maintains full functionality-including all timers, UARTs, and interrupt sources-across this entire voltage span, with guaranteed timing at 18MHz up to 5.5V and derated performance below 3.0V.

Is the DS80C323-ECD+T&R pin-compatible with standard 80C32 devices?

Yes, the DS80C323-ECD+T&R is fully pin-compatible with the 80C32 in all three packages (DIP-40, PLCC-44, TQFP-44). Its TQFP-44 footprint matches the DS80C323-ECD+T&R exactly, allowing drop-in replacement in existing layouts. All I/O pins, control signals (RST, ALE, PSEN), and bus interfaces retain identical placement and electrical behavior-though timing parameters (e.g., ALE pulse width) reflect the 4-clock architecture.

How does the dual data pointer improve memory transfer efficiency in DS80C323-ECD+T&R?

The DS80C323-ECD+T&R implements two independent 16-bit data pointers (DPTR0 at 82h/83h, DPTR1 at 84h/85h) selected via DPS bit (86h.0). This eliminates software overhead in block moves: instead of saving/restoring address registers, code toggles DPS to switch between source and destination pointers. As verified in the datasheet, a 64-byte RAM-to-RAM copy executes in 1097 machine cycles-772 fewer than single-DPTR code-directly reducing latency and power consumption in data-intensive tasks.

Can the DS80C323-ECD+T&R interface with slow peripherals like LCD modules without external wait-state logic?

Yes, the DS80C323-ECD+T&R supports variable MOVX timing via CKCON.2–0 (SFR 8Eh), allowing RD/WR strobe widths from 2 to 9 machine cycles (80ns to 1120ns at 25MHz). This lets designers directly connect to slow peripherals such as character LCDs (typ. 100μs response) or legacy DACs without glue logic. The default stretch value is 1 (3-cycle MOVX), ensuring compatibility with existing 120ns SRAM, while higher values accommodate slower devices.

What are the key differences between DS80C323-ECD+T&R and DS80C320-ECL+?

The DS80C323-ECD+T&R and DS80C320-ECL+ share identical pinouts, instruction sets, and peripherals-but differ critically in voltage range (2.7–5.5V vs. 4.25–5.5V) and max clock (18MHz vs. 33MHz). The DS80C323-ECD+T&R targets low-power and battery-operated systems, while DS80C320-ECL+ prioritizes raw speed in 5V environments. Both include dual UARTs and programmable watchdog, but only DS80C323-ECD+T&R guarantees operation down to 2.7V with full feature retention.