Analog Devices Inc./Maxim Integrated DS80C320-QNG/T&R

Overview

DS80C320-QNG/T&R from Maxim Integrated is a high-speed, 80C32-compatible 8-bit microcontroller with 4-clock-per-machine-cycle architecture, 256 bytes of on-chip RAM, three 16-bit timer/counters, and dual full-duplex hardware serial ports. It operates from 4.25V to 5.5V at up to 33MHz, delivering ~2.5× speed improvement over standard 80C32 in typical embedded control applications.

For engineers reviewing the DS80C320-QNG/T&R datasheet, DS80C320-QNG/T&R pinout, DS80C320-QNG/T&R application, or DS80C320-QNG/T&R equivalent, key selection considerations include its -40°C to +85°C industrial temperature range, 44-pin PLCC package, programmable MOVX memory access stretch (2–9 cycles), dual data pointer for accelerated block moves, and integrated power-fail reset and watchdog timer.

Technical Context

The DS80C320-QNG/T&R implements a redesigned 8051 core eliminating wasted clock and memory cycles, executing most instructions in 4 oscillator cycles versus 12 in legacy 80C32. Its dual-data-pointer architecture (DPTR0 at 82h/83h, DPTR1 at 84h/85h) enables single-instruction switching between source and destination addresses during memory moves.

Peripherals are controlled via dedicated SFRs: Clock Control Register (CKCON @ 8Eh) configures MOVX stretch (CKCON.2–0) and timer clock dividers (CKCON.3–5); Serial Control 1 (SCON1 @ C0h) and Serial Buffer 1 (SBUF1 @ C1h) manage the second UART; and DPS bit (bit 0 of 86h) selects active DPTR. Timers default to 12-cycle mode on reset for backward compatibility but support 4-cycle operation for higher precision timing.

Key Specifications

Pinout & Package

DS80C320-QNG/T&R is housed in a 44-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead geometry, designed for surface-mount assembly and thermal reliability in industrial PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS80C320-MNG+, DS80C320-QNG/T&R delivers higher clock speed (33MHz vs. 25MHz) in a surface-mount PLCC package ideal for industrial reworkability; compared with DS80C320-ENL+, it offers identical speed and temperature rating but uses PLCC instead of TQFP - simplifying inspection and repair without sacrificing performance.

Availability

DS80C320-QNG/T&R is available at Aetrix Electronics and suitable for industrial automation, medical device control, smart metering, and legacy 8051 system upgrades requiring stable component supply and long-term manufacturability.

Supply support for DS80C320-QNG/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) designs precision analog, mixed-signal, and high-reliability microcontrollers for industrial, medical, and communications applications.

The DS80C320-QNG/T&R belongs to Maxim's high-speed 8051-compatible microcontroller family, engineered to deliver 2.5× performance uplift in legacy 5V systems while preserving software and pin compatibility.

FAQ

What is the maximum crystal frequency supported by DS80C320-QNG/T&R?

The DS80C320-QNG/T&R supports a maximum crystal frequency of 33MHz, enabling an apparent instruction execution speed of approximately 82.5MHz due to its 4-clock-per-machine-cycle architecture. This specification is confirmed in the Ordering Information table and Detailed Description section of the official Maxim datasheet. The DS80C320-QNG/T&R maintains full functionality across its entire -40°C to +85°C operating temperature range at this frequency.

Does DS80C320-QNG/T&R include on-chip program memory (ROM)?

No, the DS80C320-QNG/T&R does not include on-chip program memory. It is a ROM-less variant, requiring external program memory accessed via the multiplexed P0 address/data bus and P2 upper address lines. This design follows the 80C32 architecture, and the EA pin must be tied low to enable external code fetches. The DS80C320-QNG/T&R does integrate 256 bytes of on-chip scratchpad RAM, which is directly accessible without external bus cycles.

How does the dual data pointer in DS80C320-QNG/T&R improve memory operations?

The DS80C320-QNG/T&R implements two independent 16-bit data pointers (DPTR0 at SFR 82h/83h and DPTR1 at 84h/85h), selected via the DPS bit (bit 0 of SFR 86h). This allows software to hold source and destination addresses simultaneously, eliminating the need to save and restore DPTR values during block memory moves. As demonstrated in the datasheet, a 64-byte move executes in 1097 machine cycles with dual DPTR versus 1869 cycles with a single DPTR - a 41% reduction that scales with block size.

What is the function of the CKCON register in DS80C320-QNG/T&R?

The CKCON register (SFR address 8Eh) in DS80C320-QNG/T&R controls two critical timing features: bits CKCON.2–0 configure the MOVX instruction stretch value (2–9 machine cycles) for flexible external memory/peripheral interfacing, and bits CKCON.3–5 independently select 4- or 12-clock-per-cycle operation for Timers 0, 1, and 2. On reset, MOVX defaults to 3-cycle stretch and timers default to 12-cycle mode for backward compatibility with legacy 80C32 code.

Is DS80C320-QNG/T&R pin-compatible with standard 80C32 microcontrollers?

Yes, the DS80C320-QNG/T&R is fully pin-compatible with the standard 80C32 in the 44-pin PLCC package, including identical signal assignments for P0–P3, RST, XTAL1/XTAL2, PSEN, ALE, EA, VCC, and GND. All timer/counters, serial ports, and I/O port structures match, allowing direct replacement in existing designs. However, designers must verify timing-critical code due to the faster 4-clock core - peripherals relying on precise instruction delays may require adjustment.