Precison Edge®
SY10E111A/L
®
Precision Edge
Micrel, Inc.
SY100E111A/L
5V/3.3V 1:9 DIFFERENTIAL
CLOCK DRIVER (w/o ENABLE)
SY10E111A/L
SY100E111A/L
FEATURES
■ 5V and 3.3V power supply options
■ 200ps part-to-part skew
®
Precision Edge
■ 50ps output-to-output skew
■ Differential design
DESCRIPTION
■ VBB output
The SY10/100E111A/L are low skew 1-to-9 differential
driver designed for clock distribution in mind. The
SY10/100E111A/L's function and performance are similar to
the popular SY10/100E111, with the improvement of lower
jitterandtheaddedfeatureoflowvoltageoperation. Itaccepts
one signal input, which can be either differential or single-
ended if the VBB output is used. The signal is fanned out to 9
identical differential outputs.
■ Voltage and temperature compensated outputs
■ 75KΩ input pulldown resistors
■ Fully compatible with Motorola MC100LVE111
■ Available in 28-pin PLCC package
BLOCK DIAGRAM
The E111A/L are specifically designed, modeled and
produced with low skew as the key goal. Optimal design and
layoutservetominimizegatetogateskewwithinadevice,and
empirical modeling is used to determine process control limits
that ensure consistent tpd distributions from lot to lot. The net
result is a dependable, guaranteed low skew device.
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
0
0
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
To ensure that the tight skew specification is met it is
necessary that both sides of the differential output are
terminated into 50Ω, even if only one side is being used. In
most applications, all nine differential pairs will be used and
therefore terminated. In the case where fewer that nine pairs
are used, it is necessary to terminate at least the output pairs
on the same package side as the pair(s) being used on that
side, in order to maintain minimum skew. Failure to do this will
resultinsmalldegradationsofpropagationdelay(ontheorder
of 10-20ps) of the output(s) being used which, while not being
catastrophictomostdesigns, willmeanalossofskewmargin.
IN
IN
The E111A/L, as with most other ECL devices, can be
operated from a positive VCC supply in PECL mode. This
allows the E111A/L to be used for high performance clock
distribution in +5V/+3.3V systems. Designers can take
advantage of the E111A/L's performance to distribute low
skew clocks across the backplane or the board. In a PECL
environment,seriesorTheveninlineterminationsaretypically
used as they require no additional power supplies. For
systems incorporating GTL, parallel termination offers the
lowest power by taking advantage of the 1.2V supply as
terminating voltage.
V
BB
PIN NAMES
Pin
IN, IN
Function
Differential Input Pair
Differential Outputs
VBB Output
Q0, Q0 — Q8, Q8
VBB
VCCO
VCC to Output
Precision Edge is a registered trademark of Micrel, Inc.
Rev.: J
Amendment: /0
M9999-032006
hbwhelp@micrel.com or (408) 955-1690
1
Rev. Date: March 2006