SY10EL34/L
SY100EL34/L
5V/3.3V ÷2, ÷4, ÷8 Clock Generation Chip
Precision Edge®
Precision Edge is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
December 2011 M9999-120611-I
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General Description
The SY10/100EL34/L are low-skew ÷2, ÷4, ÷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 VBB output, a sinusoidal source can be AC-
coupled into the device. If a single-ended input is to be
used, the VBB output should be connected to the CLK
input and bypassed to ground via a 0.01µF capacitor. The
VBB 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.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Precision Edge®
Features
• 3.3V and 5V power supply options
• 50ps output-to-output skew
• Synchronous enable/disable
• Master Reset for synchronization
• Internal 75KΩ input pull-down resistors
• Available in 16-pin SOIC package
Pin Description
Pin Name Pin Function
CLK Differential clock inputs.
EN Synchronous enable.
MR Master reset.
VBB Reference output.
Q0 Differential
÷
2 outputs.
Q1 Differential
÷
4 outputs.
Q2 Differential
÷
8 outputs.
Micrel, Inc. Precision Edge
®
SY10EL34/L
SY100EL34/L
December 2011 3 M9999-120611-I
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Ordering Information
Part Number Package Type Operating Range Package Marking Lead Finish
SY10EL34LZG Z16-2 Industrial SY10EL34LZG with
Pb-Free Bar Line Indicator Pb-Free NiPdAu
SY10EL34LZGTR(2) Z16-2 Industrial SY10EL34LZG with
Pb-Free Bar Line Indicator Pb-Free NiPdAu
SY100EL34LZG Z16-2 Industrial SY100EL34LZG with
Pb-Free Bar Line Indicator Pb-Free NiPdAu
SY100EL34LZGTR(2) Z16-2 Industrial SY100EL34LZG with
Pb-Free Bar Line Indicator Pb-Free NiPdAu
SY10EL34ZG Z16-2 Industrial SY10EL34ZG with
Pb-Free Bar Line Indicator Pb-Free NiPdAu
SY10EL34ZGTR(2) Z16-2 Industrial SY10EL34ZG with
Pb-Free Bar Line Indicator Pb-Free NiPdAu
SY100EL34ZG Z16-2 Industrial SY100EL34ZG with
Pb-Free Bar Line Indicator Pb-Free NiPdAu
SY100EL34ZGTR(2) Z16-2 Industrial SY100EL34ZG with
Pb-Free Bar Line Indicator Pb-Free NiPdAu
Notes:
1. Contact factory for die availability. Dice are guaranteed at TA = 25°C, DC electricals only.
2. Tape and reel.
Pin Configuration
16-Pin Narrow SOIC (Z16-2)
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®
SY10EL34/L
SY100EL34/L
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DC Electrical Characteristics(1)
VEE = VEE (minimum) to VEE (maximum); VCC = GND.
Symbol Paramete
r
Min. Typ. Max. Units
TA = −40°C
IEE
Power Supply Current
mA
10EL
−
−
49
100EL
−
−
49
VBB
Output Reference Voltage
V
10EL
−
1.43 −1.30
100EL
−
1.38 −1.26
IIH Input High Current
−
−
150 µA
TA = 0°C
IEE
Power Supply Current
mA
10EL
−
−
49
100EL
−
−
49
VBB
Output Reference Voltage
V
10EL
−
1.38 −1.27
100EL
−
1.38 −1.26
IIH Input High Current
−
−
150 µA
TA = +25°C
IEE
Power Supply Current
mA
10EL
−
−
49
100EL
−
−
49
VBB
Output Reference Voltage
V
10EL
−
1.35 −1.25
100EL
−
1.38 −1.26
IIH Input High Current
−
−
150 µA
TA = +85°C
IEE
Power Supply Current
mA
10EL
−
−
49
100EL
−
−
54
VBB
Output Reference Voltage
V
10EL
−
1.31 −1.19
100EL
−
1.38 −1.26
IIH Input High Current
−
−
150 µA
Note:
1. Parametric values specified at:
− 5V Power Supply Range:
100EL34 Series: −4.2V to −5.5V
10EL34 Series: −4.75V to −5.5V
− 3V Power Supply Range:
10/100EL34L Series: −3.0V to −3.8V
Micrel, Inc. Precision Edge
®
SY10EL34/L
SY100EL34/L
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AC Electrical Characteristics(1)
VEE = VEE (minimum) to VEE (maximum); VCC = GND.
Symbol Paramete
r
Min. Typ. Max. Units
TA = −40°C
tPD
Propagation Delay to Output
ps CLK 960 1100 1200
MR 650 800 1010
tSKEW Within-Device Skew
(2)
−
−
50 ps
tS Set-Up Time ( EN ) 400 − − ps
tH Hold Time ( EN ) 200 − − ps
VPP Minimum Input Swing
(3)
250
−
− mV
VCMR Common-Mode Range
(4)
−
1.3
−
−0.4 V
tr
tf
Output Rise/Fall Times
Q (20% − 80%) 275 400 525 ps
TA = 0°C
tPD
Propagation Delay to Output
ps CLK 960 1100 1200
MR 650 800 1010
tSKEW Within-Device Skew
(2)
−
−
50 ps
tS Set-Up Time ( EN ) 400 − − ps
tH Hold Time ( EN ) 200 − − ps
VPP Minimum Input Swing
(3)
250
−
− mV
VCMR Common-Mode Range
(4)
−
1.4
−
−0.4 V
tr
tf
Output Rise/Fall Times
Q (20% − 80%) 275 400 525 ps
TA = +25°C
tPD
Propagation Delay to Output
ps CLK 960 1100 1200
MR 650 800 1010
tSKEW Within-Device Skew
(2)
−
−
50 ps
tS Set-Up Time ( EN ) 400 − − ps
tH Hold Time ( EN ) 200 − − ps
VPP Minimum Input Swing
(3)
250
−
− mV
VCMR Common-Mode Range
(4)
−
1.4
−
−0.4 V
tr
tf
Output Rise/Fall Times
Q (20% − 80%) 275 400 525 ps
Micrel, Inc. Precision Edge
®
SY10EL34/L
SY100EL34/L
December 2011 6 M9999-120611-I
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AC Electrical Characteristics(1) (Continued)
VEE = VEE (minimum) to VEE (maximum); VCC = GND.
Symbol Paramete
r
Min. Typ. Max. Units
TA = +85°C
tPD
Propagation Delay to Output
ps CLK 960 1100 1200
MR 650 800 1010
tSKEW Within-Device Skew
−
−
50 ps
tS Set-Up Time ( EN ) 400 − − ps
tH Hold Time ( EN ) 200 − − ps
VPP Minimum Input Swing
(3)
250
−
− mV
VCMR Common-Mode Range
(4)
−
1.4
−
−0.4 V
tr
tf
Output Rise/Fall Times
Q (20% − 80%) 275 400 525 ps
Notes:
1. Parametric values specified at:
− 5V Power Supply Range:
100EL34 Series: −4.2V to −5.5V
10EL34 Series: −4.75V to −5.5V
− 3V 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 VPP minimum and 1V. The lower end of the CMR range varies 1:1 with VEE. The
numbers in the specification table assume a nominal VEE = −3.3V. Note for PECL operation, the VCMR(MIN) will be fixed at 3.3V − IVCMR(MIN)I.
Truth Table
CLK EN MR Function
Z L L Divide
ZZ H L
Hold Q0−2
X X H
Reset Q0−2
Notes:
Z = LOW-to-HIGH transition
ZZ = HIGH-to-LOW transition
Micrel, Inc. Precision Edge
®
SY10EL34/L
SY100EL34/L
December 2011 7 M9999-120611-I
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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.
Micrel, Inc. Precision Edge
®
SY10EL34/L
SY100EL34/L
December 2011 8 M9999-120611-I
hbwhelp@micrel.com or (408) 955-1690
Package Information
16-Pin .150” Wide SOIC (Z16-2)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com
Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This
information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry,
specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability
whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties
relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right.
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
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