FDDI / Fast Ethernet PHYceiverTM - Integrated Circuit Systems
Description
Integrated Circuit Systems, Inc.
ICS1887
FDDI / Fast Ethernet PHYceiverTM
General Description
The ICS1887 is designed to provide high performance clock recovery and generation for 125 MHz serial data streams.
The ICS1887 is ideally suited for LAN transceiver applications in either FDDI or Fast Ethernet environments.
The ICS1887 converts NRZ to/from NRZI data in addition to providing a 5-bit parallel digital data transmit and receive interface.
Clock and data recovery is performed on an input serial data stream or the buffered transmit data depending upon the state of the loopback input.
A continuous clock source will continue to be present even in the absence of input data.
All internal timing is derived from either a low cost crystal, differential or single-ended source.
The ICS1887 utilizes advanced CMOS phase-locked loop technology which combines high performance and low power at a greatly reduced cost.
Features
• • • • • • • • • • • • Single IC solution to existing designs requiring multiple devices Data and clock recovery for 125 MBaud FDDI or Fast Ethernet applications Clock multiplication from either a crystal, differential or single-ended timing source Continuous clock in the absence of data No external PLL components Lock/Loss status indicator output Loopback mode for system diagnostics Selectable loop timing mode PECL driver with settable sink current Parallel digital transmit and receive data interface NRZ to/from NRZI data conversion Consult ICS for optional configurations and data rates
Block Diagram
Pin Configuration
28-Pin SOIC
PHYceiver is a trademark of Integrated Circuit Systems, Inc.
ICS1887RevF112596
ICS1887
Pin Descriptions
PIN NUMBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 PIN NAME VSS TXOFF~2 CD~ TX+ TX– VSS IPRG1 RX– RX+ LB~ LOCK RD4 RD3 VSS RD2 RD1 RD0 RCLK VDD REF_IN REF_OUT VDD TCLK TD0 TD1 TD2 TD3 TD4 TYPE TTL-Compatible TTL-Compatible 1 PECL PECL DESCRIPTION Negative Supply Voltage Transmitter O...
Similar Datasheet
