ICS8520 Datasheet, PDF (1/8 Pages) Integrated Circuit Systems – LOW SKEW, 1-TO-16 DIFFERENTIAL-TO-3.3V LVHSTL FANOUT BUFFER

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS8520
LOW SKEW, 1-TO-16
DIFFERENTIAL-TO-3.3V LVHSTL FANOUT BUFFER
GENERAL DESCRIPTION
The ICS8520 is a low skew, high performance
,&6
1-to-16 Differential-to-3.3V LVHSTL Fanout Buffer
HiPerClockS™ _{and a member of the HiPerClockS™ family of}
High Performance Clock Solutions from ICS. The
ICS8520 has 1 clock input pair. The CLK, nCLK
pair can accept most standard differential input levels.
Guaranteed output skew, part-to-part skew and crossover
voltage characteristics make the ICS8520 ideal for interfac-
ing to today’s most advanced microprocessor and static
RAMs.
FEATURES
• 16 differential 3.3V LVHSTL outputs each with the ability to
drive 50Ω to ground
• 1 differential CLK, nCLK input pair
• CLK, nCLK pair can accept the following differential input
levels: LVDS, LVPECL, LVHSTL, SSTL, HCSL
• Maximum output frequency up to 500MHz
• Translates single ended input levels to LVHSTL levels with
resistor bias nCLK input
• Output skew: 50ps (maximum)
• Part-to-part skew: 250ps (maximum)
• Propagation delay: 1.6ns (maximum)
• VOH: 1.2V (maximum)
• 40% of VOH ≤ Vcrossover ≤ 60% of VOH
• 3.3V core, 1.8V output operating supply voltages
• 0°C to 70°C ambient operating temperature
BLOCK DIAGRAM
PIN ASSIGNMENT
CLK
nCLK
Q0
nQ0
Q15
nQ15
VCCO
Q11
48 47 46 45 44 43 42 41 40 39 38 37
1
36
2
35
CLK
VCCO
Q1
nQ1
Q14
nQ14
nQ11 3
Q10 4
34 nQ0
33 Q0
Q2
Q13
nQ10 5
32 nQ1
nQ2
Q3
nQ13
Q12
GND 6
Q9 7
ICS8520
31 Q1
30 GND
nQ3
nQ12
nQ9 8
29 nQ2
Q4
nQ4
Q11
nQ11
Q8 9
nQ8 10
VCCO 11
28 Q2
27 nQ3
26 Q3
Q5
nQ5
Q10
nQ10
VCC 12
25 VCCO
13 14 15 16 17 18 19 20 21 22 23 24
Q6
Q9
nQ6
nQ9
Q7
Q8
nQ7
nQ8
48-Lead LQFP
7mm x 7mm x 1.4mm body package
Y Package
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.
ICS8520DY
www.icst.com/products/hiperclocks.html
REV. B JULY 5, 2001
1