The AT89S52-24PU is a high-performance, low-power CMOS 8-bit microcontroller built on the industry-standard 8051 (MCS-51) architecture. It features 8 KB of in-system programmable (ISP) Flash memory and 256 bytes of internal RAM, all housed in a 40-pin PDIP package suited for through-hole mounting. With 32 programmable I/O pins, three 16-bit timers, full-duplex UART, watchdog timer, dual data pointers, and two power-saving modes (Idle and Power-down), this MCU delivers versatile reliability across embedded applications. Its static logic design allows operation from 0 Hz to 24 MHz within a 4.0–5.5 V supply range, and it endures -40 °C to +85 °C—making it ideal for industrial, automotive, medical, consumer electronics, and DIY projects where robustness and reusability are key.
| Specification |
Details |
| Product Category |
8-bit Microcontrollers – MCU |
| Core |
8051 (MCS-51 compatible) |
| Program Memory Size |
8 KB (Flash) |
| Program Memory Type |
In-System Programmable Flash |
| Data RAM Size |
256 bytes |
| Package / Case |
PDIP-40 (Through-Hole) |
| Maximum Clock Frequency |
24 MHz (supports up to 33 MHz) |
| ADC Resolution |
None |
| Number of I/Os |
32 I/O pins |
| Supply Voltage – Min |
4.0 V |
| Supply Voltage – Max |
5.5 V |
| Mounting Style |
Through-Hole |
| Data Bus Width |
8-bit |
| Operating Temperature – Min |
–40 °C |
| Operating Temperature – Max |
+85 °C |
| Series |
89S |
| Packaging |
Tube |
| Brand |
Microchip Technology |
| Height |
approx. 4.83 mm (PDIP body) |
| Length |
approx. 52.58 mm (PDIP body) |
| Interface Type |
UART (serial) |
| Number of Timers / Counters |
3 × 16-bit |
| Processor Series |
AT89x |
| Product |
MCUs |
| Product Type |
8-bit Microcontrollers – MCU |
| Core Features |
Watchdog Timer, Dual Data Pointers, Idle/Power-down Modes |
| Program Memory Endurance |
~10,000 write/erase cycles |
| Static Operation |
0 Hz to 33 MHz (fully static) |
| Interrupt Architecture |
6-vector, two-level |
| Peripherals |
Full-duplex UART, WDT |
