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NOT RECOMMENDED FOR NEW DESIGNS

COAXIAL

CABLE DRIVER

SY10EL89

FINAL

FEATURES

375ps propagation delay

1.6V output swings

Internal 75K

Ω

input pull-down resistors

Available in 8-pin SOIC package

DESCRIPTION

The SY10EL89 is a differential fanout gate specifically

designed to drive coaxial cables. The device is especially

useful in Digital Video Broadcast applications. For this

application, since the system is polarity-free, each output

of the device can be used as an independent driver.

The driver boasts a voltage gain of approximately 40

and produces output swings twice as large as a standard

ECL output. When driving a coaxial cable, proper

termination is required at both ends of the line to minimize

signal loss. The 1.6V output swings allow for termination

at both ends of the cable while maintaining the required

800mV swing at the receiving end of the cable. Because

of the larger output swings, the device cannot be

terminated into the standard –2.0V. All of the DC

parameters are tested with a 50Ω to –3.0V load. The

driver accepts a standard differential ECL input and can

run off the Digital Video Broadcast standard –5.0V supply.

PIN CONFIGURATION/BLOCK DIAGRAM

PIN NAMES

Data Inputs

Data Outputs

Function

SOIC

TOP VIEW

, Q

Rev.: G

Amendment: /0

Issue Date: February 2003

Micrel

SY10EL89

DC ELECTRICAL CHARACTERISTICS

= V

(Min.) to V

(Max.); V

= GND

= -40

Symbol

Parameter

Power Supply Current

Min.

Typ.

Max.

Min.

= 0

Typ.

Max.

= +25

Min.

Typ.

Max.

= +85˚C

Min.

Typ.

Max.

Unit

µA

Output HIGH Voltage

(1)

–1.23 –1.10 –0.98 –1.17 –1.05 –0.93 –1.13 –1.02 –0.90 –1.06 –0.96 –0.81

Output LOW Voltage

(1)

–2.84 –2.72 –2.58 –2.84 –2.70 –2.56 –2.84 –2.70 –2.56 –2.84 –2.67 –2.51

Power Supply Voltage

Input HIGH Current

–4.75

—

–5.5

150

–4.75

—

–5.5

150

–4.75

—

–5.5

150

–4.75

—

–5.5

150

NOTE:

1. V

and V

specified for 50Ω to –3.0V load.

AC ELECTRICAL CHARACTERISTICS

= V

(Min.) to V

(Max.); V

= GND

= -40

Symbol

PLH

PHL

skew

CMR

Parameter

Propagation Delay to

Output D

Within-Device Skew

Minimum Input Swing

(1)

Common Mode Range

(2)

Min.

200

—

150

(2)

Typ.

340

—

330

Max.

480

—

–0.4

455

Min.

250

—

150

(2)

205

= 0

Typ.

340

—

330

Max.

430

—

–0.4

455

= +25

Min.

260

—

150

(2)

205

Typ.

350

—

330

Max.

440

—

–0.4

455

= +85˚C

Min.

310

—

150

(2)

205

Typ.

400

—

330

Max.

490

—

–0.4

455

Unit

Output Rise/Fall Times Q 205

(20% to 80%)

NOTES:

1. Minimum input swing for which AC parameters are guaranteed. The device has a DC gain of

≈40.

2. The CMR range is referenced to the most positive side of the differential input signal. Normal operation is obtained if the HIGH level falls within the specified

range and the peak-to-peak voltage lies between V

(Min._ and 1V. The lower end of the CMR range is dependent on V

and is equal to V

+ 2.5V.

Micrel

SY10EL89

DC BLOCKING CAPACITORS

75Ω 75Ω COAX

EL89

0.1µF

75Ω 75Ω COAX

150Ω 150Ω

0.1µF

Figure 1. Termination Configuration

PRODUCT ORDERING CODE

Ordering

Code

SY10EL89ZC

SY10EL89ZCTR*

*Tape and Reel

Note 1.

Recommended for new designs.

Package

Type

Z8-1

Operating

Range

Commercial

Marking

Code

HEL89

Ordering

Code

SY10EL89ZI

(1)

SY10EL89ZITR*

(1)

Package

Type

Z8-1

Operating

Range

Industrial

Marking

Code

HEL89

Micrel

SY10EL89

8 LEAD SOIC .150" WIDE (Z8-1)

Rev. 03

MICREL, INC.

TEL

1849 FORTUNE DRIVE SAN JOSE, CA 95131

FAX

USA

+ 1 (408) 944-0800

+ 1 (408) 944-0970

WEB

http://www.micrel.com

The information furnished by Micrel in this datasheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use.

Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.

Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can

reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into

the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s

use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify

Micrel for any damages resulting from such use or sale.