APPLICATION NOTES AND REFERENCE DIAGRAMS
S2070 Compatibility with Existing Products
S2070
The S2070 is the CMOS equivalent of the S2052. The bulleted items below outline the functional differences
between the two parts.
• S2070 typical power dissipation is 660 mW. S2052 dissipates 800 mW.
• S2070 serial input bias voltage is VCC–1.3V (standard LVPECL). This complies with both HP and Vitesse.
S2052 serial input bias voltage is VCC–0.65.
With the recommended AC coupled input connection, the bias voltage is irrelevant (see previous section on
serial input/output connections); however, designers who wish to set the bias voltage externally should take
note of the difference in bias voltage.
• S2060 serial input should not have a pull-up offset resistor.
S2052 pull-up resistor value is 10kΩ (for applications where input data goes away).
• When EWRAP is active, TXP/N outputs are static (High). This complies with the S2052. HP holds both pins
High. Vitesse holds the P output High and the N output Low.
• S2070 pin 14 is rate selection pin, held low for normal (full rate) operation. S2052 pin 14 is ground.
• S2070 pin 27 (-LCKREF) can be either floated or held high to lock to input data (normal operation).
S2052 pin 27 (-LCKREF) must be held high to lock to input data.
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Copyright ® 1999 Applied Micro Circuits Corporation
July 8, 1999
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