LOW SKEW, 1-TO-4 DIFFERENTIAL-TO-LVDS
FANOUT BUFFER
ICS8543I
General Description
Features
The ICS8543I is a low skew, high performance
• Four differential LVDS output pairs
S
IC
1-to-4 Differential-to-LVDS Clock Fanout Buffer and
a member of the HiPerClockS™ family of High
Performance Clock Solutions from IDT. Utilizing Low
Voltage Differential Signaling (LVDS) the ICS8543I
• Selectable differential CLK/nCLK or LVPECL clock inputs
HiPerClockS™
• CLK/nCLK pair can accept the following differential input levels:
LVPECL, LVDS, LVHSTL, SSTL, HCSL
• PCLK/nPCLK pair can accept the following differential input
provides a low power, low noise, solution for distributing clock
signals over controlled impedances of 100Ω. The ICS8543I has
two selectable 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.
levels: LVPECL, CML, SSTL
• Maximum output frequency: 650MHz
• Translates any single-ended input signals to LVDS levels with
resistor bias on nCLK input
• Additive phase Jitter, RMS: 0.164ps (typical)
• Output skew: 40ps (maximum)
• Part-to-part skew: 600ps (maximum)
• Propagation delay: 2.6ns (maximum)
• Full 3.3Vsupply mode
Guaranteed output and part-to-part skew characteristics make the
ICS8543I ideal for those applications demanding well defined
performance and repeatability.
• -40°C to 85°C ambient operating temperature
• Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
Pin Assignment
Block Diagram
GND
CLK_EN
CLK_SEL
CLK
1
2
20 Q0
Pullup
CLK_EN
D
19
nQ0
Q
3
4
18
17
VDD
Q1
LE
Pulldown
Pullup
CLK
nCLK
0
nCLK
PCLK
nPCLK
5
6
7
8
9
16 nQ1
0
Q0
15
14
13
Q2
nQ2
GND
nQ0
Pulldown
Pullup
PCLK
nPCLK
1
1
Q1
nQ1
OE
GND
VDD 10
12 Q3
11
nQ3
Pulldown
CLK_SEL
Q2
nQ2
ICS8543I
Q3
20-Lead TSSOP
6.5mm x 4.4mm x 0.925mm
package body
nQ3
Pullup
OE
G Package
Top View
IDT™ / ICS™ LVDS FANOUT BUFFER
1
ICS8543BGI REV. E SEPTEMBER 9, 2008