The SY10/100EL38/L are low skew

4/6 clock

generation chips designed explicitly for low skew clock
generation applications. The internal dividers are
synchronous to each other, therefore, the common output
edges are all precisely aligned. The devices can be driven
by either a differential or single-ended ECL or, if positive
power supplies are used, PECL input signal. In addition,
by using the V

output, a sinusoidal source can be AC-

coupled into the device. If a single-ended input is to be
used, the V

output should be connected to the CLK

input and bypassed to ground via a 0.01

F capacitor.

The V

output is designed to act as the switching

reference for the input of the EL38/L under single-ended
input conditions. As a result, this pin can only source/
sink up to 0.5mA of current.

The common enable (EN) is synchronous so that the

internal dividers will only be enabled/disabled when the
internal clock is already in the LOW state. This avoids
any chance of generating a runt clock pulse on the
internal clock when the device is enabled/disabled as
can happen with an asynchronous control. An internal
runt pulse could lead to losing synchronization between
the internal divider stages. The internal enable flip-flop is
clocked on the falling edge of the input clock, therefore,
all associated specification limits are referenced to the
negative edge of the clock input.

The Phase_Out output will go HIGH for one clock cycle

whenever the

2 and the

4/6 outputs are both

transitioning from a LOW to a HIGH. This output allows
for clock synchronization within the system.

Upon start-up, the internal flip-flops will attain a

random state; the master reset (MR) input allows for the
synchronization of the internal dividers, as well as for
multiple EL38/Ls in a system.

PIN CONFIGURATION/BLOCK DIAGRAM

3.3V and 5V power supply options

50ps output-to-output skew

Synchronous enable/disable

Master Reset for synchronization

Internal 75K

input pull-down resistors

Available in 20-pin SOIC package

DESCRIPTION

FEATURES

5V/3.3V

4/6 CLOCK

GENERATION CHIP

Precision EdgeTM

SY10EL38/L

SY100EL38/L

FINAL

DIVSEL CLK

CLK

Phased_Out

TOP VIEW

SOIC

Z20-1

Rev.: F

Amendment: /0

Issue Date:

February 2003

Precision EdgeTM

Precision Edge is a trademark of Micrel, Inc.

Precision EdgeTM

SY10EL38/L

SY100EL38/L

Micrel

A =

40

A =

+25

A =

+85

Symbol

Parameter

Min.

Typ.

Max.

Min.

Typ.

Max.

Min.

Typ.

Max.

Min.

Typ.

Max.

Unit

Power Supply Current

10EL

100EL

Output Reference

Voltage

10EL

-1.43

-1.30

-1.38

-1.27

-1.35

-1.25

-1.31

-1.19

100EL

-1.38

-1.26

-1.38

-1.26

-1.38

-1.26

-1.38

-1.26

Input High Current

150

DC ELECTRICAL CHARACTERISTICS

(1)

= V

(Min.) to V

(Max.); V

= GND

NOTE:

1. Parametric values specified at:

5 volt Power Supply Range

100EL38 Series:

-4.2V to -5.5V.

10EL38 Series

-4.75V to -5.5V.

3 volt Power Supply Range

10/100EL38L Series:

-3.0V to -3.8V.

CLK

Function

Divide

Hold Q

Reset Q

TRUTH TABLE

NOTE:

Z = LOW-to-HIGH transition

ZZ = HIGH-to-LOW transition

DIVSEL

OUTPUTS

Divide by 4

Divide by 6

Pin

Function

CLK

Differential Clock Inputs

Synchronous Enable

Master Reset

Reference Output

Differential

2 Outputs

Differential

4/6 Outputs

DIVSEL

Frequency Select Input

PIN NAMES

Precision EdgeTM

SY10EL38/L

SY100EL38/L

Micrel

= -40

= 0

= +25

= +85

Symbol

Parameter

Min.

Typ.

Max.

Min. Typ. Max. Min. Typ. Max.

Min.

Typ.

Max. Unit

MAX

Maximum Toggle Frequency

1000

MHz

PLH

Propagation Delay to Output

PHL

CLK

Output (Diff.)

950

1150

950

1150

970

1170 1050

1250

CLK

Output (S.E.)

900

1200

900

1200

920

1220 1000

1300

Output

600

900

600

900

600

900

600

900

skew

Within-Device Skew

(2)

-- Q

All

Part-to-Part

-- Q

(Diff.)

200

All

240

Set-up Time

CLK

300

150

DIVSEL

CLK

300

Hold Time

CLK

400

150

400

150

400

150

400

150

CLK

DIVSEL

400

200

400

200

400

200

400

200

Minimum Input Swing

(3)

CLK

250

CMR

Common Mode Range

(4)

CLK

1.3

0.4

1.4

0.4

1.4

0.4

1.4

0.4

Reset Recovery Time

100

Minimum Pulse Width

CLK

800

700

Output Rise/Fall Times

280

550

280

550

280

550

280

550

(20% --80%)

AC ELECTRICAL CHARACTERISTICS

(1)

= V

(Min.) to V

(Max.); V

= GND

NOTES:

1. Parametric values specified at:

5 volt Power Supply Range

100EL38 Series:

-4.2V to -5.5V.

10EL38 Series

-4.75V to -5.5V.

3 volt Power Supply Range

10/100EL38L Series:

-3.0V to -3.8V.

2. Skew is measured between outputs under identical transitions.

3. Minimum input swing for which AC parameters are guaranteed. The device will function reliably with differential inputs down to 100mV.

4. 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 varies 1:1 with V

. The numbers in the spec table

assume a nominal V

= 3.3V. Note for PECL operation, the V

CMR

(min) will be fixed at 3.3V IV

CMR

(min)I.

Precision EdgeTM

SY10EL38/L

SY100EL38/L

Micrel

LOGIC DIAGRAM

TIMING DIAGRAMS

CLK

DIVSEL

Phase

Out

Logic

Phased_Out

(÷ 2)

(÷ 4/6)

CLK

Q (÷ 2)

Q (÷ 4)

Q (÷ 6)

Phase_Out(÷ 4)

Phase_Out(÷ 6)

PRODUCT ORDERING CODE

Ordering

Package

Operating

Marking

Code

Type

Range

Code

SY10EL38LZC

Z20-1

Commerical

HEL38L

SY10EL38LZCTR*

Z20-1

Commerical

HEL38L

SY100EL38LZC

Z20-1

Commerical

XEL38L

SY100EL38LZCTR*

Z20-1

Commerical

XEL38L

*Tape and Reel

Note 1.

Recommended for new designs.

Ordering

Package

Operating

Marking

Code

Type

Range

Code

SY10EL38LZI

(1)

Z20-1

Industrial

HEL38L

SY10EL38LZITR*

(1)

Z20-1

Industrial

HEL38L

SY100EL38LZI

(1)

Z20-1

Industrial

XEL38L

SY100EL38LZITR*

(1)

Z20-1

Industrial

XEL38L

*Tape and Reel

Precision EdgeTM

SY10EL38/L

SY100EL38/L

Micrel

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

Rev. 03

MICREL, INC.

1849 FORTUNE DRIVE

SAN JOSE, CA 95131

USA

TEL

+ 1 (408) 944-0800

FAX

+ 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.

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ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: SY10/100EL38/L