ICS83940 데이터 시트보기 (PDF) - Integrated Circuit Systems
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ICS83940 Datasheet PDF : 11 Pages
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Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS83940
LOW SKEW, 1-TO-18
LVCMOS FANOUT BUFFER
GENERAL DESCRIPTION
The ICS83940 is a low skew, 1-to-18 Fanout
,&6
Buffer and a member of the HiPerClockS™
HiPerClockS™ family of High Performance Clock Solutions from
ICS. The low impedance LVCMOS out-
puts are designed to drive 50Ω series or parallel
terminated transmission lines. The effective fanout can be in-
creased from 18 to 36 by utilizing the ability of the outputs to
drive two series terminated lines. The differential clock
input is designed to accept any differential input levels
including LVPECL.
The ICS83940 is characterized at full 3.3V, full 2.5V and mixed
3.3V input and 2.5V output operating supply modes. Guaran-
teed output and part-to-part skew characteristics make the
ICS83940 ideal for those clock distribution applications de-
manding well defined performance and repeatability.
FEATURES
• 18 LVCMOS outputs, 23Ω typical output impedance
• Output frequency up to 200MHz
• 150ps output skew
• Part to part skew: 850ps
• Selectable LVCMOS or differential clock input
• LVTTL / LVCMOS clock select input
• Full 3.3V, 2.5V or mixed 3.3V, 2.5V supply modes
• 0°C to 70°C ambient operating temperature
• Industrial temperature information available upon request
BLOCK DIAGRAM
CLK_SEL
CLK0
nCLK0
0
LVCMOS_CLK
1
PIN ASSIGNMENT
Q0
Q1 - Q16
Q17
GND
GND
LVCMOS_CLK
CLK_SEL
CLK
nCLK
VDDI
VDDO
32 31 30 29 28 27 26 25
1
24
2
23
3
22
4
ICS83940 21
5
20
6
19
7
18
8
17
9 10 11 12 13 14 15 16
Q6
Q7
Q8
VDDI
Q9
Q10
Q11
GND
32-Lead LQFP
Y Pacakge
7mm x 7mm x 1.4mm package body
Top View
The Preliminary Information presented herein represents a product in prototyping or pre-production. The noted characteristics are based on initial
product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice.
83940AY
www.icst.com/products/hiperclocks.html
REV. B JULY 31, 2001
1
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