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AT89S51 - 8-bit Microcontroller

Download the AT89S51 datasheet PDF. This datasheet also covers the AT8 variant, as both devices belong to the same 8-bit microcontroller family and are provided as variant models within a single manufacturer datasheet.

General Description

The AT89S51 is a low-power, high-performance CMOS 8-bit microcontroller with 4K bytes of In-System Programmable Flash memory.

The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry-standard 80C51 instruction set and pinout.

Key Features

  • Compatible with MCS®-51 Products.
  • 4K Bytes of In-System Programmable (ISP) Flash Memory.
  • Endurance: 10,000 Write/Erase Cycles.
  • 4.0V to 5.5V Operating Range.
  • Fully Static Operation: 0 Hz to 33 MHz.
  • Three-level Program Memory Lock.
  • 128 x 8-bit Internal RAM.
  • 32 Programmable I/O Lines.
  • Two 16-bit Timer/Counters.
  • Six Interrupt Sources.
  • Full Duplex UART Serial Channel.
  • Low-power Idle and Power-.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (AT8-9S51.pdf) that lists specifications for multiple related part numbers.

📁 Similar Datasheet

Part Number Description Manufacturer
AT89S52 8-bit Microcontroller ATMEL
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AT89S64 8-bit Flash Microcontroller ATMEL

Other Datasheets by Atmel (now Microchip Technology)

Part Number Description
AT89S2051 8-bit Microcontroller
AT89S4051 8-bit Microcontroller
AT89S4D12 8-Bit Microcontroller with 132K Bytes Flash Data Memory
AT89SND2CMP3B Single-Chip Flash Microcontroller
AT892051 8-Bit Microcontroller with 2K Bytes Flash

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
Features • Compatible with MCS®-51 Products • 4K Bytes of In-System Programmable (ISP) Flash Memory – Endurance: 10,000 Write/Erase Cycles • 4.0V to 5.5V Operating Range • Fully Static Operation: 0 Hz to 33 MHz • Three-level Program Memory Lock • 128 x 8-bit Internal RAM • 32 Programmable I/O Lines • Two 16-bit Timer/Counters • Six Interrupt Sources • Full Duplex UART Serial Channel • Low-power Idle and Power-down Modes • Interrupt Recovery from Power-down Mode • Watchdog Timer • Dual Data Pointer • Power-off Flag • Fast Programming Time • Flexible ISP Programming (Byte and Page Mode) • Green (Pb/Halide-free) Packaging Option 1. Description The AT89S51 is a low-power, high-performance CMOS 8-bit microcontroller with 4K bytes of In-System Programmable Flash memory.