The maximum clock frequency of the LM3S1751 is 50 MHz.
The LM3S1751 has 256 KB of flash memory.
Yes, the LM3S1751 is rated for industrial temperature ranges (-40°C to 85°C).
No, the LM3S1751 does not have built-in Ethernet capability. However, it does have a 10/100 Ethernet MAC interface that can be used with an external PHY chip.
The power consumption of the LM3S1751 varies depending on the clock frequency and operating mode. At 50 MHz, the typical power consumption is around 250 mW.