3.3V/5V, 4GHz PECL/ECL
÷2 Clock Generator
The SY89312V is an integrated ÷2 divider with differential
clock inputs. It is functionally equivalent to the
SY100EP32V but in an ultra-small 8-pin QFN package
that features a 70% smaller footprint.
The VBB pin, an internally generated voltage supply, is
available for this device only. For single-ended input
conditions, the unused differential input is connected to VBB
as a switching reference voltage. VBB can also bias AC-
coupled inputs. When used, decouple VBB and VCC via a
0.01µF capacitor and limit current sourcing or sinking to
0.5mA. When not in use, VBB should be left open.
The reset pin is asynchronous and is asserted when it is
high. Upon power-up, the internal flip-flops will be in a
random state; the reset allows for the synchronous use of
multiple SY89312Vs in a system.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
• Guaranteed AC performance over temperature and
• >4GHz fMAX input
• <160ps tr/tf
• <440ps tpd
• 3.3V and 5V power supply operation
• 100k ECL/PECL-compatible I/O
• Internal 75KΩ input pull-down resistors
• Wide operating temperature range: –40°C to +85°C
• Available in ultra-small 8-pin 2mm × 2mm QFN package
1. F = Divide by 2 function.
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
June 25, 2013
firstname.lastname@example.org or (408) 955-1690