NXP Semiconductors P89LPC9321FN,112

Overview

P89LPC9321FN,112 from NXP Semiconductors is an 8-bit accelerated two-clock 80C51 microcontroller in a 28-pin DIP package, featuring 8 kB byte-erasable flash, 512-byte on-chip data EEPROM, dual analog comparators with PGA, and 23 I/O pins. It operates from 2.4 V to 3.6 V with 5 V-tolerant I/Os and supports real-time clock, PWM, capture/compare, UART, I²C, and SPI-ideal for industrial control panels requiring compact, low-power embedded logic with analog sensing.

For engineers reviewing the P89LPC9321FN,112 datasheet, P89LPC9321FN,112 pinout, P89LPC9321FN,112 application, or P89LPC9321FN,112 equivalent, this page delivers verified technical context, validated pin functions, confirmed peripheral capabilities (including CCU, RTC, and programmable oscillator), and precise alternative part guidance for production design-in and legacy replacement.

Technical Context

The P89LPC9321FN,112 executes instructions in 2–4 clocks-six times faster than standard 80C51 at same frequency-enabling 111 ns minimum instruction cycle at 18 MHz. Its architecture integrates a 23-bit system timer (7-bit prescaler + 16-bit counter) usable as real-time clock, plus a Capture/Compare Unit supporting PWM generation, input capture, and output compare with four independent channels (OCA–OCD, ICA–ICB).

It embeds dual analog comparators with selectable inputs and reference, a single programmable gain amplifier (2×/4×/8×/16×), and configurable port outputs (quasi-bidirectional, open-drain, push-pull). Power management includes idle mode, two power-down modes (1 μA typical), brownout detect (4-level), and on-chip oscillators (RC, watchdog, external) with dynamic switching for performance/power trade-offs.

Key Specifications

Pinout & Package

Package: 28-pin plastic dual in-line package (DIP28), 600 mil width, through-hole mounting compatible with legacy PCB layouts and manual prototyping.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with P89LPC9321FN,112, the P89LPC9351FN,112 adds ADC and memory headroom for feature-rich upgrades, while the P89LPC9251FN,112 reduces cost and complexity for basic logic-only implementations-both maintain identical DIP28 footprint and 80C51 compatibility.

Availability

P89LPC9321FN,112 is available at Aetrix Electronics and suitable for industrial control panels, smart sensor nodes, legacy equipment retrofits, and programmable logic modules requiring stable component supply across extended product lifecycles.

Supply support for P89LPC9321FN,112 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

NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The P89LPC9321FN,112 belongs to NXP's LPC900 family of enhanced 80C51 microcontrollers, designed specifically for cost-sensitive, space-constrained embedded systems needing integrated analog peripherals, low-power operation, and robust in-system programmability.

FAQ

What is the maximum operating frequency of the P89LPC9321FN,112?

The P89LPC9321FN,112 supports a maximum operating frequency of 18 MHz, achievable using the internal RC oscillator (with optional clock doubler), external crystal/resonator, or watchdog oscillator. At 18 MHz, its accelerated two-clock architecture delivers instruction cycle times of 111 ns to 222 ns-six times faster than a standard 80C51 at the same clock rate. The P89LPC9321FN,112 maintains full functionality across its 0–18 MHz range.

Does the P89LPC9321FN,112 support in-system programming (ISP)?

Yes, the P89LPC9321FN,112 supports In-System Programming (ISP) via its UART interface, allowing firmware updates while the device remains soldered in the target application. This capability eliminates the need for socketed programming and enables field upgrades. The P89LPC9321FN,112 also supports In-Circuit Programming (ICP) and In-Application Programming (IAP), with flash security bits preventing unauthorized readout of protected code.

How many I/O pins does the P89LPC9321FN,112 provide, and what are their voltage tolerances?

The P89LPC9321FN,112 provides 23 I/O pins minimum and up to 26 I/O pins depending on oscillator and reset configuration. All I/O pins are 5 V tolerant-capable of being pulled up to or driven to 5.5 V-even when VDD is operated at 2.4 V to 3.6 V. This eliminates external level-shifting components when interfacing with legacy 5 V peripherals or logic families.

What analog peripherals are integrated into the P89LPC9321FN,112?

The P89LPC9321FN,112 integrates two analog comparators (CMP1 and CMP2) with selectable positive/negative inputs and reference sources, plus a single Programmable Gain Amplifier (PGA) offering gains of 2×, 4×, 8×, or 16× that can be applied to comparator inputs. These features enable precision threshold detection, battery monitoring, and simple analog signal conditioning without external op-amps or ADCs-directly supported in the P89LPC9321FN,112's hardware architecture.

Is the P89LPC9321FN,112 pin-compatible with other members of the LPC900 family?

The P89LPC9321FN,112 shares the same 28-pin DIP package and core pinout with other LPC900 variants like P89LPC9351FN,112 and P89LPC9251FN,112, but functional pin assignments (e.g., peripheral multiplexing) differ based on feature set. While mechanical footprint is identical, electrical and firmware compatibility requires verification against each variant's datasheet-especially for pins assigned to unique peripherals such as the ADC in the P89LPC9351FN,112. The P89LPC9321FN,112 is not a drop-in replacement for parts with differing peripheral configurations.