Analog Devices Inc./Maxim Integrated DS80C310-QNG

Overview

DS80C310-QNG from Maxim Integrated is a high-speed, 8051-compatible CMOS microcontroller designed for industrial embedded control. It executes 8051 instructions 1.5×–3× faster than standard 80C32 at same crystal frequency, supports up to 25MHz crystal (62.5MHz apparent execution), features dual data pointers, variable MOVX timing (2–9 machine cycles), and operates across –40°C to +85°C.

For engineers reviewing the DS80C310-QNG datasheet, DS80C310-QNG pinout, DS80C310-QNG application, or DS80C310-QNG equivalent, this page delivers verified core architecture details, PLCC-44 pin mapping, real-world timing trade-offs for external memory interfacing, and drop-in upgrade paths from legacy 80C31/80C32 designs.

Technical Context

The DS80C310-QNG implements a 4-clock-per-machine-cycle core versus the legacy 12-clock 8051, eliminating dummy memory cycles and enabling single-cycle instruction execution in 160ns at 25MHz. Its dual DPTR (SFRs 82h–85h) and DPS bit (86h.0) accelerate block memory moves without code overhead.

Timer/counter operation defaults to 12-clock compatibility mode on reset but is individually configurable via CKCON bits (8Eh.3–8Eh.5) for 4-clock speed. MOVX access timing is software-adjustable (CKCON.2–CKCON.0) from 2 to 9 machine cycles to interface with diverse external RAM/peripherals without glue logic.

Key Specifications

Pinout & Package

DS80C310-QNG is housed in a 44-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead configuration, compatible with industry-standard PLCC-44 sockets and reflow profiles. Pin 1 is marked by a notch on the package top edge.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS80C320-QNG, DS80C310-QNG offers streamlined peripheral set and lower cost for basic 8051 upgrades; versus AT89C51RC2-RLTUM, it delivers superior instruction throughput and external memory flexibility but requires external ROM and lacks in-system programming.

Availability

DS80C310-QNG is available at Aetrix Electronics and suitable for industrial control systems, legacy equipment modernization, smart metering interfaces, and automated test equipment requiring stable component supply across extended temperature ranges.

Supply support for DS80C310-QNG 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 high-performance analog, mixed-signal, and digital ICs for industrial, communications, and computing applications.

The DS80C310-QNG belongs to Maxim's high-speed 8051 microcontroller family, engineered to deliver pin- and code-compatible performance uplift for legacy 80C31/80C32 systems operating in harsh environments.

FAQ

What is the maximum crystal frequency supported by the DS80C310-QNG?

The DS80C310-QNG supports a maximum crystal frequency of 25MHz, as specified in the Ordering Information table and confirmed in the General Description. This enables an apparent instruction execution rate of approximately 62.5MHz (2.5× speedup over legacy 8051). Operation is guaranteed from DC to 25MHz, and the device is fully static - meaning it halts cleanly at 0Hz without loss of state.

Is the DS80C310-QNG pin-compatible with standard 80C32 devices?

Yes, the DS80C310-QNG is explicitly pin-compatible with the 80C32 in PLCC-44 packaging, as stated in the General Description and Compatibility section. All I/O, control, and power pins map identically, allowing direct socket replacement in existing 80C32 designs. However, timing-critical code may require adjustment due to the DS80C310-QNG's faster instruction execution and configurable MOVX timing.

How does the dual data pointer (DPTR) function in the DS80C310-QNG?

The DS80C310-QNG implements two independent 16-bit data pointers: DPTR (SFRs 82h/83h) and DPTR1 (SFRs 84h/85h). The DPS bit (SFR 86h.0) selects the active pointer. Toggling DPS enables rapid switching between source and destination addresses during block memory moves, eliminating the need to save/restore addresses in registers or RAM - a key optimization for DMA-like operations in 8051 firmware.

What is the purpose of the MOVX timing stretch feature in the DS80C310-QNG?

MOVX timing stretch in the DS80C310-QNG allows software to configure external data memory access duration from 2 to 9 machine cycles via CKCON.2–CKCON.0. This eliminates external wait-state logic by adapting to varying peripheral speeds - e.g., using 2 cycles for fast SRAM and 9 cycles for slow LCD controllers - while maintaining full 8051 instruction compatibility and deterministic bus timing.

Does the DS80C310-QNG include on-chip program memory?

No, the DS80C310-QNG contains no on-chip ROM or Flash memory, as confirmed in the Memory Access section. It relies entirely on external program memory accessed via the multiplexed P0 address/data bus and P2 high-order address lines. The EA pin must be tied LOW to enable external code fetches, and the device requires external ROM or EPROM for program storage.