ICS83905I
LOW SKEW, 1:6 CRYSTAL INTERFACE-TO-
LVCMOS / LVTTL FANOUT BUFFER
Integrated
Circuit
Systems, Inc.
GENERAL DESCRIPTION
FEATURES
The ICS83905I is a low skew, 1-to-6 LVCMOS / • 6 LVCMOS / LVTTL outputs
ICS
LVTTL Fanout Buffer and a member of the
• Outputs able to drive 12 series terminated lines
HiPerClockS™
HiPerClockS™family of High Performance Clock
Solutions from ICS. The low impedance
LVCMOS/LVTTL outputs are designed to drive
• Crystal oscillator interface
• Crystal input frequency range: 10MHz to 40MHz
• Output skew: 80ps (maximum)
50W series or parallel terminated transmission lines.The ef-
fective fanout can be increased from 6 to 12 by utilizing the
ability of the outputs to drive two series terminated lines.
• RMS phase jitter @ 25MHz, (100Hz - 1MHz):
0.26ps (typical) (VDD = VDDO = 2.5V)
The ICS83905I is characterized at full 3.3V, 2.5V, and 1.8V,
mixed 3.3V/2.5V, 3.3V/1.8V and 2.5V/1.8V output operating
supply mode. Guaranteed output and part-to-part skew
characteristics along with the 1.8V output capabilities makes
the ICS83905I ideal for high performance, single ended appli-
cations that also require a limited output voltage.
Phase noise:
Offset
100Hz ..............-129.7 dBc/Hz
1kHz ..............-144.4 dBc/Hz
10kHz ..............-147.3 dBc/Hz
100kHz ..............-157.3 dBc/Hz
Noise Power
• 5V tolerant enable inputs
• Synchronous output enables
• Operating power supply modes:
Full 3.3V, 2.5V and 1.8V,
mixed 3.3V core/2.5V output operating supply,
mixed 3.3V core/1.8V output operating supply,
mixed 2.5V core/1.8V output operating supply
• -40°C to 85°C ambient operating temperature
• Lead-Free package fully RoHS compliant
BLOCK DIAGRAM
PIN ASSIGNMENT
1
2
3
4
5
6
7
8
XTAL_OUT
ENABLE 2
GND
16
15
14
13
12
11
10
9
XTAL_IN
ENABLE 1
BCLK5
VDDO
BCLK4
GND
BCLK0
BCLK1
BCLK0
VDDo
BCLK1
GND
XTAL_IN
BCLK3
VDD
BCLK2
BCLK2
BCLK3
XTAL_OUT
ICS83905I
16-LeadTSSOP
4.4mm x 5.0mm x 0.92mm body package
G Pacakge
TopView
BCLK4
BCLK5
ENABLE 1
SYNCHRONIZE
ENABLE 2
SYNCHRONIZE
83905AGI
http://www.icst.com/products/hiperclocks.html
REV. B MAY 16, 2005
1