AT89S51-24PU The Atmel AT89S51-24PU is an 8-bit 8051 microcontroller with 4KB In-System Programmable Flash, operating at up to 24 MHz. It features 128 bytes of RAM, 32 I/O lines, and UART connectivity in a 40-pin PDIP package.
Mfr Part #:

AT89S51-24PU

Available from 2 distributors
Mfr Name: Atmel
Atmel
The Atmel AT89S51-24PU is an 8-bit 8051 microcontroller with 4KB In-System Programmable Flash, operating at up to 24 MHz. It features 128 bytes of RAM, 32 I/O lines, and UART connectivity in a 40-pin PDIP package.
✓ Total Stock: 265 pcs

AT89S51-24PU Available from 2 distributors

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AT89S51-24PU Specifications Quick View

Most important parameters for selection – full specs in datasheet.
Category
Manufacturer Name
Connectivity
Core Processor
Core Size
Halogen Free
Lead Spacing
Mounting Type
Number of I
Operating Temperature
Oscillator Type
Peripherals
Program Memory Size
Program Memory Type
RAM Size
Speed
Supplier Device Package
Voltage
Watchdog Timer

AT89S51-24PU Description

Short technical summary and product information.

The Atmel AT89S51-24PU is a low-power, high-performance CMOS 8-bit microcontroller based on the industry-standard 8051 architecture. It integrates 4KB of In-System Programmable (ISP) Flash memory with endurance of 10,000 write/erase cycles, making it suitable for prototyping and production firmware updates.

 

Key specifications include a maximum clock frequency of 24 MHz, 128 bytes of internal RAM, 32 programmable I/O lines, two 16-bit timer/counters, a full-duplex UART serial channel, and a watchdog timer. The device operates from a 4V to 5.5V supply and across an industrial temperature range of -40°C to +85°C.

 

The microcontroller is housed in a 40-pin PDIP (Plastic Dual Inline Package) with 0.600-inch row spacing, designed for through-hole mounting. Its static logic design allows operation down to zero frequency, and it supports Idle and Power-down modes for power-sensitive applications.

AT89S51-24PU Quick Information

Product Type: Microcontroller
Series: 89S
Canonical Name: AT89S51-24PU 8-bit 8051 Microcontroller with 4KB Flash
Subcategory: 8-bit Microcontrollers

AT89S51-24PU Compliance

RoHS Status: RoHS Compliant
Moisture Sensitivity Level (MSL): 1 Unlimited
REACH Status: REACH Unaffected
Lead Free: Lead Free (Pb-free)

AT89S51-24PU Features

  • 8051 CISC core architecture with 8-bit data bus.
  • 4KB In-System Programmable Flash memory (10K cycles).
  • 24 MHz maximum clock frequency for moderate throughput.
  • 32 programmable I/O lines for peripheral control.
  • Through-hole 40-pin PDIP package for easy prototyping.

AT89S51-24PU Applications

  • Embedded control and automation systems.
  • Industrial sensor interface and monitoring.
  • Consumer electronics with UART communication.
  • Low-power battery-operated designs with power-down modes.

AT89S51-24PU FAQs

7 frequently asked questions generated from this part’s specifications.
What is the operating voltage range of the AT89S51-24PU?

The device operates from 4.0V to 5.5V DC.

What package type does the AT89S51-24PU come in?

It is available in a 40-pin PDIP (0.600", 15.24mm) through-hole package.

What is the operating temperature range?

The industrial temperature range is -40°C to +85°C.

Is the AT89S51-24PU RoHS compliant?

It is listed as RoHS3 Compliant, but this data is unverified.

What is the maximum clock frequency?

The maximum clock frequency is 24 MHz.

How much Flash and RAM does it have?

It has 4KB of ISP Flash memory and 128 bytes of internal RAM.

How many I/O pins are available?

The microcontroller provides 32 programmable I/O lines.

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