AT89S51 Datasheet 8-bit Microcontroller

Manufacturer: Atmel (now Microchip Technology)

Download the AT89S51 datasheet PDF. This datasheet also includes the AT8 variant, as both parts are published together in a single manufacturer document.

📥 Download Datasheet

AT89S51 8-bit microcontroller by Atmel (now Microchip Technology) - Datasheet Preview — Note: The manufacturer provides a single datasheet file (AT8-9S51.pdf) that lists specifications for multiple related part numbers.

Datasheet Details

Part number	AT89S51
Manufacturer	Atmel (now Microchip Technology)
File Size	237.04 KB
Description	8-bit Microcontroller
Datasheet	AT89S51 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.

The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory programmer.

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-.

More Datasheets from 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
AT894051	8-Bit Microcontroller
AT89C1051	8-Bit Microcontroller with 1K Byte Flash
AT89C1051U	8-Bit Microcontroller with 1K Bytes Flash
AT89C2051	8-Bit Microcontroller
AT89C2051X2	8-bit Microcontroller