Intel 8051 microcontroller family
Intel 8051 and 80C51 are members of Intel MCS-51 family of 8-bit microcontrollers.
In addition to on-chip clock oscillator, 2 16-bit timers, 4 I/O ports and a serial port,
all 8051 and 80C51 chips have 128 bytes of RAM and 4 KB masked ROM. If necessary,
8051 memory can be expanded up to 128 KB by adding up to 64 KB of external program and data memory.
Picture of: Intel P8051AH
40-pin plastic DIP
Picture of: OKI M80C51-57
40-pin plastic DIP
Picture of: Signetics SCN8051H CCN40 (SCN8051HCCN40)
40-pin plastic DIP
Picture of: USSR KR1816VE51
40-pin plastic DIP
Soviet clone of Intel 8051AH microcontroller