The SY10/100EL34/L are low skew

8 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 EL34/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 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.

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 EL34/Ls in a system.

Pin

Function

CLK

Differential Clock Inputs

Synchronous Enable

Master Reset

Reference Output

Differential

2 Outputs

Differential

4 Outputs

Differential

8 Outputs

DESCRIPTION

PIN NAMES

FEATURES

5V/3.3V

8 CLOCK

GENERATION CHIP

Precision EdgeTM

SY10EL34/L

SY100EL34/L

FINAL

PIN CONFIGURATION/BLOCK DIAGRAM

SOIC

TOP VIEW

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 16-pin SOIC package

CLK

÷2

÷4

÷8

Q D

Rev.: G

Amendment: /0

Issue Date:

February 2003

Precision Edge is a trademark of Micrel, Inc.

Precision EdgeTM

Precision EdgeTM

SY10EL34/L

SY100EL34/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

10EL

Current

100EL

Output Reference 10EL 1.43

1.30 1.38

1.27 1.35

1.25 1.31

1.19

Voltage

100EL 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

100EL34 Series:

-4.2V to -5.5V.

10EL34 Series

-4.75V to -5.5V.

3 volt Power Supply Range

10/100EL34L Series:

-3.0V to -3.8V.

A =

40

A =

+25

A =

+85

Symbol

Parameter

Min.

Typ.

Max.

Min.

Typ.

Max.

Min.

Typ.

Max.

Min.

Typ.

Max.

Unit

PLH

Propagation Delay to

PHL

Output

CLK

960

1100

1200

960

1100

1200

960

1100

1200

960

1100 1200

650

800

1010

650

800

1010

650

800

1010

650

800

1010

skew

Within-Device Skew

(2)

Set-up Time EN

400

Hold Time EN

200

Minimum Input Swing

(3)

250

CMR

Common Mode Range

(4)

1.3

0.4

1.4

0.4

1.4

0.4

1.4

0.4

Output Rise/Fall Times

275

400

525

275

400

525

275

400

525

275

400

525

Q (20% 80%)

= V

(Min.) to V

(Max.); V

= GND

AC ELECTRICAL CHARACTERISTICS

(1)

NOTES:

1. Parametric values specified at:

5 volt Power Supply Range

100EL34 Series:

-4.2V to -5.5V.

10EL34 Series

-4.75V to -5.5V.

3 volt Power Supply Range

10/100EL34L 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.

TRUTH TABLE

CLK

Function

Divide

Hold Q

Reset Q

NOTE:

Z = LOW-to-HIGH transition

ZZ = HIGH-to-LOW transition

Precision EdgeTM

SY10EL34/L

SY100EL34/L

Micrel

Ordering

Package

Operating

Marking

Code

Type

Range

Code

SY10EL34LZC

Z16-2

Commercial

HEL34L

SY10EL34LZCTR*

Z16-2

Commercial

HEL34L

SY100EL34LZC

Z16-2

Commercial

XEL34L

SY100EL34LZCTR*

Z16-2

Commercial

XEL34L

*Tape and Reel

TIMING DIAGRAM

The EN signal will freeze the internal clocks to the flip-flops on the first falling edge of CLK after its assertion. The internal dividers
will maintain their state during the internal clock freeze and will return to clocking once the internal clocks are unfrozen. The outputs
will transition to their next states in the same manner, time and relationship as they would have had the EN signal not been asserted.

PRODUCT ORDERING CODE

CLK

Internal Clock

Disabled

Internal Clock

Enabled

Note 1.

Recommended for new designs.

Ordering

Package

Operating

Marking

Code

Type

Range

Code

SY10EL34LZI

(1)

Z16-2

Industrial

HEL34L

SY10EL34LZITR*

(1)

Z16-2

Industrial

HEL34L

SY100EL34LZI

(1)

Z16-2

Industrial

XEL34L

SY100EL34LZITR*

(1)

Z16-2

Industrial

XEL34L

*Tape and Reel

Precision EdgeTM

SY10EL34/L

SY100EL34/L

Micrel

16 LEAD SOIC .150" WIDE (Z16-2)

Rev. 02

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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