What this part is — and where it fits
The Intel 87C196KD, order code 5962-9069203QYA, is an 8-bit microcontroller built around the 8096 CPU core. It runs at 20 MHz, carries 32 I/O lines, and integrates an 8-channel A/D converter with switchable 8- or 10-bit resolution. On-chip peripherals include a PWM output and a watchdog timer. Program memory is EPROM, meaning the firmware is factory-programmed and cannot be updated in the field — a deliberate choice for locked-down, high-reliability designs. The part is qualified to DESC/JAN standards, with a military temperature range of -55 to 125°C, making it suitable for avionics, missile guidance, satellite, and downhole instrumentation where extended thermal cycling and radiation tolerance are expected.
20 MHz clock — what it means for the bus
At 20 MHz, the 87C196KD executes instructions with a timing budget for external memory access, serial port polling, and A/D conversion triggers.
EPROM memory: no field updates possible
The program memory is EPROM, not Flash or OTP. This means the device is programmed once during manufacturing and cannot be erased or rewritten in-system.
Military temperature grade and qualification
Rated for -55 to 125°C case temperature, this part is intended for environments where commercial or industrial parts would fail.
How it compares to the 5962-9169702MUA (80C51-based)
The 5962-9169702MUA is an 80C51 core at 16 MHz with 32 I/O and EPROM, also DESC-qualified. The 87C196KD runs at 20 MHz and includes an integrated A/D converter and PWM.