180 MHz Cortex-M3 — what the speed buys you
The 180 MHz core is the fastest clock available in the LPC18xx series. It directly determines how much headroom you have for real-time control loops, TCP/IP stack processing, or display refresh. At this speed, a single-cycle multiply or a 16-bit timer capture runs without stalling the CPU — useful when the part is handling both a CANopen stack and a PWM motor-control interrupt simultaneously.
Memory sizing: 1 MB Flash, 136 KB RAM, 16 KB EEPROM
The 1 MB Flash is enough for a dual-image firmware layout (bootloader + application) with room for a small file system. The 136 KB SRAM is split across multiple banks; it can hold a 640x480 frame buffer at 16-bit colour if you use the external bus for the display controller. The 16 KB EEPROM emulation area is useful for storing calibration constants or configuration parameters that survive a firmware update.
Lifecycle and sourcing status
The LPC1857FET256,551 is listed as Active in production. No last-time-buy or end-of-life notice has been issued. For current pricing and availability, the part is sourced and quoted to order through independent distribution — submit an RFQ for a confirmed quote and lead time at the time of order.
Temperature grade and environment
Rated for -40°C to 85°C ambient, this part suits factory automation and outdoor telecom cabinets. The 256-LBGA package is surface-mount only.