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AT89S51-24JU

MCHPAT89S51-24JU

Microchip Technology
8051 89S Microcontroller IC 8-Bit 24MHz 4KB (4K x 8) FLASH 44-PLCC (16.6x16.6)
Active9,614 in stock
Datasheet Digi-Key Compare Prices

Overview

The AT89S51-24JU is a low-power, high-performance 8-bit microcontroller based on the classic 8051 architecture. It features 4KB of In-System Programmable (ISP) Flash memory and a 24MHz maximum clock speed, providing a reliable solution for legacy industrial and consumer applications. Its 5V operation and 44-pin PLCC package make it suitable for existing 8051-based system designs requiring hardware-based watchdog timers.

Why Choose This Part

The primary advantage is its In-System Programming (ISP) capability, which allows the Flash memory to be reprogrammed without removing the chip from the socket. It supports a wide 4.0V to 5.5V operating range and includes a dual data pointer to accelerate memory access. The hardware Watchdog Timer enhances system reliability by providing a recovery mechanism from software lock-ups.

Applications

Industrial Process Control
Utilizing the 32 programmable I/O lines and two 16-bit timers for managing sequential logic in factory automation.
Legacy System Maintenance
Drop-in replacement for older 8051 variants in existing 5V hardware architectures needing higher reliability.
Simple Data Loggers
Using the integrated UART for serial communication and low-power modes for periodic monitoring tasks.
Appliance Controllers
Implementing basic user interface logic and hardware monitoring via the internal Watchdog Timer.

Key Specifications

Speed 24MHz
RAM Size 128 x 8
Core Size 8-Bit
Peripherals WDT
Connectivity UART/USART
Mounting Type Surface Mount
Number of I/O 32
Core Processor 8051
Package / Case 44-LCC (J-Lead)
Oscillator Type Internal
Program Memory Size 4KB (4K x 8)
Program Memory Type FLASH
Operating Temperature -40degC ~ 85degC (TA)
Supplier Device Package 44-PLCC (16.6x16.6)
Voltage - Supply (Vcc/Vdd) 4V ~ 5.5V

Getting Started

To develop for the AT89S51, engineers typically use the Keil C51 development tools or the SDCC open-source compiler. Programming can be achieved via the SPI-based ISP interface using a standard Atmel-ISP programmer or an Arduino-based ISP bridge. Evaluation is best performed using a 44-pin PLCC socket on a prototyping board with an external 24MHz crystal for maximum performance.

Part of AT89S family » AT89S51-24

AT89S51-24 Family

Comparing specs that differ across variants. The current part is highlighted.

Part Number Package Stock
AT89S51-24JU (this part) LCC-44 9,614
AT89S51-24AU TQFP-44 5,533
AT89S51-24PU DIP-40 2,008

Also Consider

AT89S52-24JU MCHPMicrochip Technology - Offers 8KB of Flash and 256 bytes of RAM for applications that outgrow the memory limits of the S51.
AT89S51-24PU MCHPMicrochip Technology - The same microcontroller in a 40-pin PDIP package for easier use on breadboards and through-hole PCBs.

Categories

Microcontrollers > 8051 Microcontrollers > Microchip