SY10EL1189 Datasheet, PDF (1/4 Pages) Micrel Semiconductor – FIBRE CHANNEL COAXIAL

FIBRE CHANNEL COAXIAL
CABLE DRIVER AND LOOP
RESILIENCY CIRCUIT
PRELIMINARY
SY10EL1189
FEATURES
s 425ps propagation delay
s 1.6V output swings
s Single +5V operation
s Internal 75KΩ input pull-down resistors
s Available in 16-pin SOIC package
LOGIC DIAGRAM
Local QR
Receive Data
(ECL Levels) QR
VBB
Local DT
Transmit Data
(ECL Levels) ^DT
SEL (TTL)
From Input Cable
(ECL Levels)
DR
DR
1
QT
0
QT
To Output Cable
(Enhanced Swing)
PIN CONFIGURATION
QR 1
QR 2
VCC 3
NC 4
VCC ⁵
QT 6
QT ⁷
VCC 8
Top View
SOIC
16 _VCC
15 _DR
14 _DR
13 _GND
12 VBB
11 _DT
10 _DT
9 SEL
DESCRIPTION
The SY10EL1189 is a differential receiver, differential
transmitter specifically designed to drive coaxial cables.
It incorporates the output cable driver capability of the
SY10EL89 Coaxial Cable Driver with additional circuitry
to multiplex the output cable drive source between the
cable receiver or the local transmitter inputs. The
multiplexer control circuitry is TTL compatible for ease of
operation.
The SY10EL1189 is useful as a bypass element for
Fibre Channel-Arbitrated Loop (FC-AL) or Serial Storage
Architecture (SSA) applications, to create loop style
interconnects with fault tolerant, active switches at each
device node. This device is particularly useful for back
panel applications where small size is desirable.
The EL89 style drive circuitry produces swings twice
as large as a standard PECL output. When driving a
coaxial cable, proper termination is required at both ends
of the line to minimize reflections. The 1.6V output swings
allow for proper termination at both ends of the cable.
Because of the larger output swings, the QT, QT outputs
are terminated into the thevenin equivalent of 50Ω to
VCC-3.0V instead of 50Ω to VCC-2.0V.
PIN NAMES
Pin
DR/DR
QR/QR
DT/DT
QT/QT
SEL
VCC
GND
VBB
Function
Differential Input from Receive Cable
Buffered Differential Output from Receive Cable
Differential Input to Transmit Cable
Buffered Differential Output to Transmit Cable
Multiplexer Control Signal (TTL)
Postive Power Supply
Ground
Reference Voltage Output
TRUTH TABLE
SEL
Function
L
DR ➝ QT
H
DT ➝ QT
Rev.: C Amendment: /2
1
Issue Date: January 2000