1-TO-12 DIFFERENTIAL-TO-LVCMOS FANOUT BUFFER - Integrated Circuit Systems
Description
Integrated Circuit Systems, Inc.
ICS83948I
LOW SKEW, 1-TO-12 DIFFERENTIAL-TO-LVCMOS FANOUT BUFFER
FEATURES
• Twelve LVCMOS outputs • Selectable LVCMOS clock or differential CLK, nCLK inputs • CLK, nCLK pair can accept the following differential input levels: LVDS, LVPECL, LVHSTL, SSTL, HCSL • LVCMOS_CLK accepts the following input levels: LVCMOS or LVTTL • Maximum output frequency: 250MHz • Output skew: 350ps (maximum) • Part to part skew: 1.
5ns (maximum) • 3.
3V core, 3.
3V output • -40°C to 85°C ambient operating temperature • Available in both standard and lead-free RoHS-compliant packages
GENERAL DESCRIPTION
The ICS83948I is a low skew, 1-to-12 Differential-to-LVCMOS Fanout Buffer and a member HiPerClockS™ of the HiPerClock S ™ family of High Performance Clock Solutions from ICS.
The ICS83948I has two selectable clock inputs.
The CLK, nCLK pair can accept most standard differential input levels.
The LVCMOS_CLK can accept LVCMOS or LVTTL input levels.
The low impedance LVCMOS outputs are designed to drive 50Ω series or parallel terminated transmission lines.
The www.
DataSheet4U.
com effective fanout can be increased from 12 to 24 by utilizing the ability of the outputs to drive two series terminated lines.
IC S
The ICS83948I is characterized at 3.
3V core/3.
3V output.
Guaranteed output and part-to-part skew characteristics make the ICS83948I ideal for those clock distribution applications demanding well defined performance and repeatability.
BLOCK DIAGRAM
CLK_EN D Q LE LVCMOS_CLK CLK nCLK 1 Q0 0 Q1 CLK_SEL Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 Q11 OE
PIN ASSIGNMENT
GND GND VDDO VDDO Q3 Q0 Q1 Q2
32 31 30 29 28 27 26 25 CLK_SEL LVCMOS_CLK CLK nCLK CLK_EN OE VDD GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Q11 VDDO Q10 GND Q9 VDDO Q8 GND
24 23 22
GND Q4 VDDO Q5 GND Q6 VDDO Q7
ICS83948I
21 20 19 18 17
32-Lead LQFP 7mm x 7mm x 1.
4mm package body Y Package Top View
83948AYI
www.
icst.
com/products/hiperclocks.
html 1
REV.
C DECEMBER 15, 2005
Integrated Circuit Systems, In...
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