FDDI / Fast Ethernet PHYceiverTM
The ICS1887 is designed to provide high performance clock • Single IC solution to existing designs requiring
recovery and generation for 125 MHz serial data streams. The
ICS1887 is ideally suited for LAN transceiver applications in • Data and clock recovery for 125 MBaud FDDI or Fast
either FDDI or Fast Ethernet environments. The ICS1887
converts NRZ to/from NRZI data in addition to providing a • Clock multiplication from either a crystal, differential
5-bit parallel digital data transmit and receive interface.
or single-ended timing source
Clock and data recovery is performed on an input serial data • Continuous clock in the absence of data
stream or the buffered transmit data depending upon the state • No external PLL components
of the loopback input. A continuous clock source will • Lock/Loss status indicator output
continue to be present even in the absence of input data. • Loopback mode for system diagnostics
All internal timing is derived from either a low cost crystal,
differential or single-ended source.
Selectable loop timing mode
• PECL driver with settable sink current
The ICS1887 utilizes advanced CMOS phase-locked loop • Parallel digital transmit and receive data interface
technology which combines high performance and low power • NRZ to/from NRZI data conversion
at a greatly reduced cost.
• Consult ICS for optional configurations and data rates
PHYceiver is a trademark of Integrated Circuit Systems, Inc.