GENERAL DESCRIPTION
The Am79761 Gigabit Ethernet Physical Layer Serializer/Deserializer (GigaPHY-SD) device is a 1.25 Gbps Ethernet Transceiver optimized for Gigabit Ethernet/ 1000BASE-X applications. It implements the Physical Medium Attachment (PMA) layer for a single port.
The GigaPHY-SD device can interface to fiber-optic media to support 1000BASE-LX and 1000BASE-SX applications and can interface to copper coax to support 1000BASE-CX applications.

DISTINCTIVE CHARACTERISTICS
■ Gigabit Ethernet Transceiver operates at 1.25 Gigabits per second (Gbps)
■ Suitable for both Coaxial and Optical Link applications
■ 10-bit TTL Interface for Transmit and Receive Data
■ Monolithic Clock Synthesis and Clock Recovery requires no external components
■ Word Synchronization Function (Comma Detect)
■ Low Power Operation - 700 mW typical
■ 64-pin Standard PQFP
   — 14 x 14 mm (0˚ C - 70˚ C)
   — 10 x 10 mm (0˚ C - 50˚ C)
■ 125 MHz TTL Reference Clock
■ Loopback Diagnostic
■ Single +3.3 V Supply