PDF ICS83948I Data sheet ( Hoja de datos )

Número de pieza	ICS83948I
Descripción	1-TO-12 DIFFERENTIAL-TO-LVCMOS FANOUT BUFFER
Fabricantes	Integrated Circuit Systems
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Hay una vista previa y un enlace de descarga de ICS83948I (archivo pdf) en la parte inferior de esta página. Total 10 Páginas
No Preview Available ! Integrated Circuit Systems, Inc. ICS83948I LOW SKEW, 1-TO-12 DIFFERENTIAL-TO-LVCMOS FANOUT BUFFER GENERAL DESCRIPTION The ICS83948I is a low skew, 1-to-12 Differen- ICS tial-to-LVCMOS Fanout Buffer and a member HiPerClockS™ of the HiPerClockS™ 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 www.DataShee5t40UΩ.cosmeries or parallel terminated transmission lines. The effective fanout can be increased from 12 to 24 by utilizing the ability of the outputs to drive two series terminated lines. 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 ap- plications demanding well defined performance and re- peatability. 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 BLOCK DIAGRAM CLK_EN LVCMOS_CLK CLK nCLK CLK_SEL 1 0 D Q LE OE PIN ASSIGNMENT 32 31 30 29 28 27 26 25 Q0 CLK_SEL 1 LVCMOS_CLK 2 24 GND 23 Q4 Q1 CLK 3 2 2 VDDO Q2 nCLK 4 ICS83948I 21 Q5 CLK_EN 5 20 GND Q3 OE 6 19 Q6 Q4 VDD 7 GND 8 1 8 VDDO 17 Q7 Q5 9 10 11 12 13 14 15 16 Q6 Q7 Q8 32-Lead LQFP Q9 7mm x 7mm x 1.4mm package body Y Package Q10 Top View Q11 83948AYI www.icst.com/products/hiperclocks.html 1 REV. C DECEMBER 15, 2005 1 page Integrated Circuit Systems, Inc. ICS83948I LOW SKEW, 1-TO-12 DIFFERENTIAL-TO-LVCMOS FANOUT BUFFER PARAMETER MEASUREMENT INFORMATION 1.65V±0.15V VDD, VDDO www.DataSheet4U.com LVCMOS SCOPE Qx VDD nCLK CLK V PP Cross Points GND = -1.65V±0.15V 3.3V OUTPUT LOAD AC TEST CIRCUIT GND DIFFERENTIAL INPUT LEVEL V CMR VDDO Qx 2 VDDO Qy 2 t sk(o) OUTPUT SKEW PART 1 Qx PART 2 Qy V DDO 2 V DDO 2 t sk(pp) PART-TO-PART SKEW 0.8V Clock Outputs 2V tR OUTPUT RISE/FALL TIME 2V 0.8V tF LVCMOS_ CLK nCLK CLK VDDO 2 Q0:Q11 VDDO 2 t PW VDDO 2 t PERIOD VDDO 2 Q0:Q11 VDDO 2 tPD ➤ odc = t PW t PERIOD OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD PROPAGATION DELAY 83948AYI www.icst.com/products/hiperclocks.html 5 REV. C DECEMBER 15, 2005 5 Page

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Número de pieza	Descripción	Fabricantes
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