This part is a kind of semiconductor called 5270.

Function of this product has ACT5270 64-Bit Superscaler Microprocessor.

Manufacturers : Aeroflex Circuit Technology

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Some of the text within the PDF file :

ACT5270 64-Bit Superscaler Microprocessor Features s s Full militarized QED RM5270 microprocessor Dual Issue superscalar microprocessor - can issue one integer and one floating-point instruction per cycle q 133, s Integrated secondary cache controller (R5000 compatible) q Supports 512K or 2MByte block write-through secondary s 150, 200 MHz operating frequencies – Consult Factory for latest speeds q 260 Dhrystone2.1 MIPS q SPECInt95 5.0, SPECfp95 5.3 s High-performance floating point unit q Single High performance system interface compatible with RM5260, R4600, R4700 and R5000 q 64-bit cycle repeat rate for common single precision operations and some double precision operations q Two cycle repeat rate for double precision multiply and double precision combined multiply-add operat [ ... ]

5270 PDF Datasheet Download