ICST AV1886M, ICS1886M Datasheet

Integrated
Circuit
Systems, Inc.

General Description Features

ICS1886

Block Diagram

PHYceiver is a trademark of Integrated Circuit Systems, Inc.

FDDI / Fast Ethernet PHYceiver

TM

ICS1886RevC120996

 Data and clock recovery for: 32.064 Mb/s (Japan)

34.368 Mb/s (Europe - E3) 125 MHz (Ethernet)

139.264 Mb/s (Europe - E4)

 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 drivers with settable sink current

The ICS1886 is designed to provide high performance clock
recovery and generation for either 32.064 Mb/s, 34.368
Mb/s, 125 Mb/s or 139.264 Mb/s NRZ or NRZI serial data
streams. The ICS1886 is ideally suited for LAN transceiver
applications in either European or Japanese communication
environments.

The ICS1886 also operates at the 100Mbit Ethernet
frequency of 125 MHz. This is ideal for serial Ethernet data
applications where no serial to parallel conversion is
required.

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 or an
external clock module.

The ICS1886 utilizes advanced CMOS phase-locked loop
technology which combines high performance and low
power at a greatly reduced cost.

Pin Configuration

28-Pin SOIC

2

ICS1886

Pin Descriptions

* Active Low Input.

CS1 CS0 LOOP INPUT CLOCK FREQ MODE

REF FREQ or

CRYSTAL
VSS VSS VSS Tx Data 32.064 MHz Japan 4.008 MHz
VSS VDD VSS Tx Data 34.368 MHz Europe - E3 4.296 MHz

VDD VSS VSS Tx Data 125.000 MHz Ethernet 25.000 MHz
VDD VDD VSS Tx Data 139.264 MHz Europe - E4 17.408 MHz

VSS VSS VDD Rx Data 32.064 MHz Japan 4.008 MHz
VSS VDD VDD Rx Data 34.368 MHz Europe - E3 4.296 MHz

VDD VSS VDD Rx Data 125. 000MHz Ehternet 25.000 MHz
VDD VDD VDD Rx Data 139.264 MHz Europe - E4 17.408 MHz

Table 1 - Device Clock Selection

PIN

NUMBER

PIN NAME TYPE DESCRIPTION

1 VSS Negative supply voltage.
2 LT~ Loop Timing mode select.*
3 CD~ Carrier Detect input.*
4 TX+ Positive Transmit serial data output.
5 TX- Negative Transmit serial data output.
6 VSS Negative supply voltage.
7 IPRG1 PECL Output stage current set (TX).
8 RX- Negative Receive serial data input.

9 RX+ Positive Receive serial data input.
10 LB~ Loop Back mode select.*
11 LOCK Lock detect output.
12 CS1 Clock select 1 input.
13 CS0 Clock select 0 input.
14 VSS Negative supply voltage.
15 IPRG2 PECL Output stage current set (TC, RC and RD).
16 VSS Negative supply voltage.
17 RD+ Positive recovered data output
18 RD- Negative recovered data output.
19 RC+ Positive recovered clock output.
20 RC- Negative recovered clock output.
21 VDD Positive supply voltage.
22 REF+ Positive reference clock/crystal input.
23 REF- Negative reference clock/crystal input.
24 VDD Positive supply voltage.
25 TC- Negative Transmit clock output.
26 TC+ Positive Transmit clock output.
27 TD- Negative Transmit data input.
28 TD+ Positive Transmit data input.

3

ICS1886

Absolute Maximum Ratings

VDD (measured to VSS) . . . . . . . . . . . . . . . . . . 7.0 V

Ambient Operating Temperature . . . . . . . . . . .  55° C to +125°C

Storage Temperature . . . . . . . . . . . . . . . . . . . .  65°C to +15 0 ° C

Junction Temperature . . . . . . . . . . . . . . . . . . . 175°C

Soldering Temperature . . . . . . . . . . . . . . . . . . 260°C

Recommended Operating Conditions

Stresses above those listed under Absolute Maximum Ratings above may cause permanent damage to the device. This is a
stress rating only and functional operation of the device at these or any other conditions above those listed in the operational
sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may
affect product reliability.

ICS1886 FDDI / Fast Ethernet Application

PARAMETER SYMBOL TEST CONDITIONS MIN MAX UNITS

Ambient Operating Temp. T

A 0+70ºC

Using a Negitive Supply

V

SS

VDD

-4.50

0.0

-5.50

0.0

V
V

Using a Positive Supply

V

SS

VDD

0.0

+4.50

0.0

+5.50

V
V