ICS8521I Datasheet, PDF (1/14 Pages) Integrated Circuit Systems – LOW SKEW, 1-TO-9 DIFFERENTIAL-TO-HSTL FANOUT BUFFER

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS8521I
LOW SKEW, 1-TO-9
DIFFERENTIAL-TO-HSTL FANOUT BUFFER
GENERAL DESCRIPTION
The ICS8521I is a low skew, 1-to-9 Differential-
ICS
to-HSTL Fanout Buffer and a member of the
HiPerClockS™ _{HiPerClockS™family of High Performance Clock}
Solutions from ICS. The ICS8521I has two se-
lectable clock inputs. The CLK, nCLK pair can
accept most standard differential input levels. The PCLK,
nPCLK pair can accept LVPECL, CML, or SSTL input levels.
The clock enable is internally synchronized to eliminate runt
pulses on the outputs during asynchronous assertion/
deassertion of the clock enable pin.
Guaranteed output skew, part-to-part skew and crossover
voltage characteristics make the ICS8521I ideal for today’s
most advanced applications, such as IA64 and static RAMs.
FEATURES
• Nine HSTL outputs
• Selectable differential CLK, nCLK or LVPECL clock inputs
• CLK, nCLK pair can accept the following differential
input levels: LVPECL, LVDS, HSTL, SSTL, HCSL
• PCLK, nPCLK supports the following input types:
LVPECL, CML, SSTL
• Maximum output frequency: 500MHz
• Output skew: 25ps (typical)
• Part-to-part skew: 200ps (typical)
• Propagation delay: 1.3ns (typical)
•
V = 1.4V (maximum)
OH
• 3.3V core, 1.8V output operating supply voltages
• -40°C to 85°C ambient operating temperature
• Available in both standard and lead-free RoHS
compliant packages
BLOCK DIAGRAM
PIN ASSIGNMENT
CLK_EN
CLK
nCLK
0
PCLK
nPCLK
1
CLK_SEL
D
Q
LE
32 31 30 29 28 27 26 25
Q0
VDD 1
nQ0
CLK 2
24 VDDO
23 Q3
Q1
nCLK 3
22 nQ3
nQ1
Q2
CLK_SEL 4
PCLK 5
ICS8521I
21 Q4
20 nQ4
nQ2
nPCLK 6
19 Q5
Q3
GND 7
nQ3
CLK_EN 8
18 nQ5
17 VDDO
Q4
9 1 0 1 1 1 2 1 3 1 4 1 5 16
nQ4
Q5
nQ5
Q6
32-Lead LQFP
nQ6
7mm x 7mm x 1.4mm package body
Q7
Y Package
nQ7
Top View
Q8
nQ8
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.
8521BYI
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 17, 2005
1