MICREL SY10EL1189 Datasheet

FIBRE CHANNEL COAXIAL

C

CABLE DRIVER AND LOOP
RESILIENCY CIRCUIT

PRELIMINARY

SY10EL1189

FEATURES

■ 425ps propagation delay

■ 1.6V output swings

■ Single +5V operation

■ Internal 75KΩ input pull-down resistors

■ Available in 16-pin SOIC package

LOGIC DIAGRAM

From Input Cable
(ECL Levels)

Local

VBB

Local

SEL (TTL)

QR

QR

DT
DT

1

0

To Output Cable
(Enhanced Swing)

Receive Data

(ECL Levels)

Transmit Data

(ECL Levels)

DR
DR

QT
QT

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 Function

DR/DR Differential Input from Receive Cable

PIN CONFIGURATION

QR/QR Buffered Differential Output from Receive Cable
DT/DT Differential Input to Transmit Cable
QT/QT Buffered Differential Output to Transmit Cable

QR
QR

1

2

16

V

CC

15

DR

SEL Multiplexer Control Signal (TTL)
VCC Postive Power Supply
GND Ground

3

CC

V

4

N

V

CC

QT

QT

CC

V

5

6

7

8

Top View

SOIC

14

DR

13

GND

12

BB

V

11

DT

10

DT

9

SEL

BB Reference Voltage Output

V

TRUTH TABLE

SEL Function

L DR ➝ QT
H DT ➝ QT

Rev.: C Amendment: /2

1

Issue Date: January 2000

Micrel

PRELIMINARY

SY10EL1189

ABSOLUTE MAXIMUM RATINGS

(1)

Symbol Rating Value Unit

VCC Power Supply Voltage (Referenced to GND) 0 to +7.0 V
VIN Input Voltage (Referenced to GND) 0 to VCC V

OUT Output Current — Continuous 50 mA

I

— Surge 100
TA Operating Temperature Range –40 to +85 °C
Tstore Storage Temperature Range –50 to +150 °C

CC Operating Voltage Range

V

NOTES:

1. Permanent device damage may occur if ABSOLUTE MAXIMUM RATINGS are exceeded. This is a stress rating only and functional operation is not implied
at conditions other than those detailed in the operational sections of this data sheet. Exposure to ABSOLUTE MAXIMUM RATlNG conditions for extended
periods may affect device reliability.

2. Parametric values specified at 4.75 to 5.25V.

DC ELECTRICAL CHARACTERISTICS

(2)

4.5 to 5.5 V

(1)

VCC = 5.0V, GND = 0V

A = –40°CTA = 0°CTA = +25°CTA = +85°C

T

Symbol Parameter Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit

OL Output LOW Voltage

V

(QR, QR)

V

OH Output HIGH Voltage

(QR, QR)

VOL Output LOW Voltage

(QT, QT)

V

OH Output HIGH Voltage

(QT, QT)

I

CC Quiescent Supply 20 25 42 22 26 47 23 27 47 25 28 47 mA

Current

(5)

VIL Input LOW Voltage

(DR,DR & DT,DT)

V

IH Input HIGH Voltage

(DR,DR & DT,DT)

I

IL Input LOW Current — — 150 — — 150 — — 150 — — 150 µA

(DR,DR & DT,DT)

IIH Input HIGH Current 0.5 — — 0.5 — — 0.5 — — 0.5 — — µA

(DR,DR & DT,DT)
VIL Input LOW Voltage SEL — — 0.8 — — 0.8 — — 0.8 — — 0.8 V
VIH Input HIGH Voltage SEL 2.0 — — 2.0 — — 2.0 — — 2.0 — — V
IIL Input LOW Current SEL

IH Input HIGH Current SEL

I

V

BB Output Reference 3.57 3.63 3.70 3.62 3.67 3.73 3.65 3.70 3.75 3.69 3.75 3.81 V

NOTES:

1. 10EL circuits are designed to meet the DC specifications shown in the
table after thermal equilibrium has been established. The circuit is
mounted in a test socket or mounted on a printed circuit board and
transverse air greater than 500lfm is maintained.

Voltage

(2)

(2,3)

(2,3)

(2)

(2)

3.05 3.23 3.35 3.05 3.24 3.37 3.05 3.24 3.37 3.05 3.25 3.41 V

3.92 4.05 4.11 3.98 4.09 4.16 4.02 4.11 4.19 4.09 4.16 4.28 V

(2,4)

1.94 2.22 2.50 1.83 2.12 2.41 1.80 2.10 2.39 1.77 2.06 2.35 V

(2,4)

3.71 3.89 4.08 3.79 3.98 4.17 3.83 4.02 4.20 3.90 4.09 4.28 V

3.05 — 3.50 3.05 — 3.52 3.05 — 3.52 3.05 — 3.56 V

3.77 — 4.11 3.83 — 4.16 3.87 — 4.19 3.94 — 4.28 V

VIN = 500mV — — 600 — — 600 — — 600 — — 600 µA

VIN = 2.7V — — 20 — — 20 — — 20 — — 20 µA

VIN = VCC — — 100 — — 100 — — 100 — — 100

2. Values will track 1:1 with the VCC supply.

3. Outputs loaded with 50Ω to +3.0V.

4. Outputs loaded with 50Ω to +2.0V.

5. Outputs open circuited.

2