This part is a kind of semiconductor called SP8685.

Function of this product has ECL variable modulus divider.

Manufacturers : Plessey

Image and pinout :

Some of the text within the PDF file :

SP8685 500MHz410/11 ADVANCE INFORMATION DS3646-1·2 The SP8685 is an ECL variable modulus divider, with ECL10K compatible outputs. It divides by 10 when either of the ECL control inputs, PE1 or PE2, is in the high state and by 11 when both are low (or open circuit). FEATURES s Divides by 10 or 11 s AC-Coupled Input (Internal Bias) s ECL Compatible Output QUICK REFERENCE DATA s Supply Voltage: 25·2V s Power Consumption: 300mW s Temperature Range: 255°C to 1125°C (A Grade) 230°C to 170°C (B Grade) ABSOLUTE MAXIMUM RATINGS Supply voltage Output current Storage temperature range Max. junction temperature Max. clock input voltage 28V 20mA 265°C to 1150°C 1175°C 2·5V p-p NC 1 OUTPUT 2 NC 3 16 VCC 15 PE1   CONTROL INPUTS 14 PE2  OUTPUT 4 13 NC SP8685 NC 5 12 CLOCK IN [ ... ]

SP8685 PDF Datasheet Download