ICS8501 Datasheet, PDF (1/8 Pages) Integrated Circuit Systems – Low Skew 1-to-16 Differential Current Mode Fanout Buffer

Integrated
Circuit
Systems, Inc.
ICS8501
LOW SKEW 1-TO-16 DIFFERENTIAL
CURRENT MODE FANOUT BUFFER
GENERAL DESCRIPTION
The ICS8501 is a low skew, 1-to-16 Differential
,&6
Current Mode Fanout Buffer and a member of
HiPerClockS™ the HiPerClockS™ family of High Performance
Clock Solutions from ICS. The ICS8501 is de-
signed to translate any differential signal levels
to small swing differential current mode(DCM) output levels.
An external reference resistor is used to set the value of the
current supplied to an external load load/termination resis-
tor. The load resistor value is chosen to equal the value of
the characteristic line impedance of 50Ω. The ICS8501 is char-
acterized at an operating supply voltage of 3.3V.
The small swing outputs, accurate crossover voltage and duty
cycle makes the ICS8501 ideal for interfacing to today’s most
advanced microprocessors.
FE ATURES
• 16 small swing DCM outputs
• Translates any differential input signal(PECL, HSTL, LVDS,
DCM) to DCM levels without external bias networks
• Translates single ended input levels to DCM levels with a
resistor bias network on the nCLK input
• Translates single ended input levels to inverted DCM levels
with a resistor bias network on the CLK input
• Voh(max) = 1.2V
• 40% of Voh ≤ Vcrossover ≤ 60% of Voh
• 45% ≤ Duty Cycle ≤ 55%
• Output frequency up to 500MHz
• 100ps output skew
• 3.3V operating supply
• 48 lead low-profile QFP(LQFP), 7mm x 7mm x 1.4mm
package body, 0.5mm package lead pitch
• 0°C to 70°C ambient operating temperature
BLOCK DIAGRAM
CLK
nCLK
Q0
nQ0
Q1
nQ1
Q2
nQ2
Q3
nQ3
Q4
nQ4
Q5
nQ5
Q6
nQ6
Q7
nQ7
Q15
nQ15
Q14
nQ14
Q13
nQ13
Q12
nQ12
Q11
nQ11
Q10
nQ10
Q9
nQ9
Q8
nQ8
PIN ASSIGNMENT
VCC
Q11
nQ11
Q10
nQ10
GND
Q9
nQ9
Q8
nQ8
VCC
nc
48 47 46 45 44 43 42 41 40 39 38 37
1
36
2
35
3
34
4
33
5
32
6
7
ICS8501
31
30
8
29
9
28
10
27
11
26
12
25
13 14 15 16 17 18 19 20 21 22 23 24
CLK
VCC
nQ0
Q0
nQ1
Q1
GND
nQ2
Q2
nQ3
Q3
VCC
48-Lead LQFP
Y Package
Top View
8501
www.icst.com
1
REV. A - AUGUST 23, 2000