DESCRIPTION

3.3V power supply

620ps propagation delay

Fully differential design

Supports low voltage operation

Available in 20-pin SOIC package

The SY100EL91L is a triple LVPECL-to-ECL or

LVPECL-to-LVECL translator.

A V

output is provided for interfacing with single

ended PECL signals at the input. If a single ended input
is to be used, the V

output should be connected to the

D input. The active signal would then drive the D input.
When used, the V

output should be bypassed to ground

via a 0.01

F capacitor. The V

output is designed to act

as the switching reference for the EL91L under single
ended input switching conditions. As a result this pin can
only source/sink up to 0.5mA of current.

To accomplish the level translation the EL91L requires

three power rails. The V

supply should be connected

to the positive supply, and the V

pin should be

connected to the negative power supply. The GND pins
as expected are connected to the system ground plane.
Both V

and V

should be bypassed to ground via

0.01

F capacitors.

Under open input conditions, the D input will be biased

at V

/2 and the D input will be pulled to GND. This

condition will force the Q output to a LOW, ensuring
stability.

FEATURES

3.3V TRIPLE LVPECL-to-ECL
OR LVPECL-to-LVECL
TRANSLATOR

PIN CONFIGURATION/BLOCK DIAGRAM

SOIC

TOP VIEW

Pin

Function

PECL Inputs

ECL Outputs

PECL_V

PECL Reference Voltage Output

SY100EL91L

Rev.: F

Amendment: /2

Issue Date: November, 1999

PIN NAMES

GND

PECL_V

PECL

Function

Vcc

LVPECL-to-ECL

3.3V

5.0V

LVPECL-to-LVECL

3.3V

FUNCTION TABLE

SY100EL91L

Micrel

3.3V LVPECL INPUT DC ELECTRICAL CHARACTERISTICS

(1)

ECL/LVECL OUTPUT DC ELECTRICAL CHARACTERISTICS

(1)

= 40

= 0

= +25

= +85

Symbol

Parameter

Min.

Typ.

Max.

Min.

Typ.

Max.

Min.

Typ.

Max.

Min.

Typ.

Max.

Unit

Power Supply Voltage

3.0

3.8

3.0

3.8

3.0

3.3

3.8

3.0

3.8

Input HIGH Voltage

(2)

2.135

2.420 2.135

2.420 2.135 2.350 2.420 2.135

2.420

Input LOW Voltage

(2)

1.490

1.825 1.490

1.825

Input HIGH Current

150

Input LOW Current Dn

0.5

-600

Output Reference

(2)

1.920

2.040 1.920

2.040

Power Supply Current

6.0

NOTES:

1. Parametric values specified at:

3 volt Power Supply Range

100EL91L Series

-3.0V to -3.8V.

2. These levels are for V

= 3.3V. Level specifications will vary 1:1 with V

= 40

= 0

= +25

= +85

Symbol

Parameter

Min.

Typ.

Max.

Min.

Typ.

Max.

Min.

Typ.

Max.

Min.

Typ.

Max.

Unit

Power Supply

ECL

-4.2

-5.5

-4.2

-5.5

-4.2

-5.5

-4.2

-5.5

Voltage

LVECL

-3.0

-3.8

-3.0

-3.8

-3.0

-3.8

-3.0

-3.8

Output HIGH Voltage

-1085

-880

-1025

-880

-1025

-955

-880

-1025

-880

Output LOW Voltage

-1830

-1555 -1810

-1620 -1810 -1705 -1620

-1810

-1620

Power Supply Current

NOTE:

1. Parametric values specified at:

3 volt Power Supply Range

100EL91L Series

-3.0V to -3.8V.

SY100EL91L

Micrel

AC ELECTRICAL CHARACTERISTICS

(4)

LVPECL: V

= +3.0V to +3.8V, ECL: V

= -4.2V to -5.5V, LVECL: V

= -3.0V to -3.8V

= 40

= 0

= +25

= +85

Symbol

Parameter

Min.

Typ.

Max.

Min.

Typ.

Max.

Min.

Typ.

Max.

Min.

Typ.

Max. Unit

PLH

Propagation Delay

Diff.

490

590

690

510

610

710

520

620

720

560

660

760

PHL

D to Q

S.E.

440

590

740

460

610

760

470

620

770

510

660

810

skew

Within-Device Skew

(1)

Output-to-Output

100

Part-to-Part (Diff.)

200

Duty Cycle (Diff.)

Minimum Input Swing

(2)

150

CMR

Common Mode Range

(3)

< 500mV

1.3

0.2

1.2

0.2

1.2

0.2

1.2

0.2

> 500mV

1.5

0.2

1.4

0.2

1.4

0.2

1.4

0.2

Output Rise/Fall Times Q

320

400

580

320

400

580

320

400

580

320

400

580

(20% to 80%)

NOTES:

1. Skew is measured between outputs under identical transitions.

2. Minimum input swing for which AC parameters are guaranteed. The device has a DC gain of ~40.

3. 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.

4. Parametric values specified at:

3 volt Power Supply Range

100EL91L Series

-3.0V to -3.8V.

PRODUCT ORDERING CODE

Ordering

Package

Operating

Code

Type

Range

SY100EL91LZC

Z20-1

Commercial

SY100EL91LZCTR

Z20-1

Commercial

SY100EL91L

Micrel

LVPECL-TO-ECL MODE CONFIGURATION

3.3V Configuration

5.0V Configuration

GND

LVPECL_V

ECL

LVPECL

ECL

LVPECL

ECL

LVPECL

= +3.3V

125

= 0V

= +3.3V

125

= 0V

= +3.3V

= 0V

LVPECL

DEVICE

= -3.3V

= 0V

= -3.3V

125

ECL

DEVICE

= -3.3V

= 0V

Single

Ended Mode

= +3.3V

Unused

Input

0.1ľF

-3.3V

GND

LVPECL_V

ECL

LVPECL

ECL

LVPECL

ECL

LVPECL

= +3.3V

125

= 0V

= +3.3V

125

= 0V

= +3.3V

= 0V

LVPECL

DEVICE

= -5V

= 0V

= -5V

125

ECL

DEVICE

= -5V

= 0V

Single

Ended Mode

= +3.3V

Unused

Input

0.1ľF

-5V

NOTES:

1. The schematic above demonstrates three different ways that all or any inputs of SY100EL91L can be used. The three modes or operation are: Differential

LVPECL, Single-Ended LVPECL, and/or Open.

2. If D2 an D2 are used in differential mode, then the same scheme of D0 and D0 applies. If used in single-ended mode, then use the same scheme of D1

and D1.

SY100EL91L

Micrel

20 LEAD SOIC .300" WIDE (Z20-1)

Rev. 03

MICREL-SYNERGY

3250 SCOTT BOULEVARD

SANTA CLARA

CA 95054

USA

TEL

+ 1 (408) 980-9191

FAX

+ 1 (408) 914-7878

WEB

http://www.micrel.com

This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or

other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.

Š 2000 Micrel Incorporated

Part Number SY100EL91L