ICS85357AG-11T Ver la hoja de datos (PDF) - Integrated Circuit Systems
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ICS85357AG-11T
Integrated Circuit Systems
ICS85357AG-11T Datasheet PDF : 12 Pages
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Integrated
Circuit
Systems, Inc.
ICS85357-11
4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V
LVPECL / ECL MULTIPLEXER
GENERAL DESCRIPTION
ICS
The ICS85357-11 is a 4:1 or 2:1, Crystal
Oscillator-to-3.3V LVPECL / ECL Multiplexer and
HiPerClockS™ is a member of the HiPerClockS™family of High
Performance Clock Solutions from ICS. The
ICS85357-11 has 4 selectable crystal inputs. The
device can support 10MHz to 27MHz parallel resonant crys-
tals by connecting external capacitors between XTALIN/
XTALOUT and ground. The select pins have internal pulldown
resistors and leaving one input unconnected (pulled to logic low
by the internal resistor) will transform the device into a 2:1 mul-
tiplexer. The SEL1 lead is the most significant line and the bi-
nary number applied to the select pins will select the same num-
bered data input (i.e., 00 selects XTALIN0/XTALOUT0).
FEATURES
• 1 differential 3.3V LVPECL output
• 4:1 or 2:1 Crystal Oscillator Multiplexer
• Supports parallel resonant crystals with a frequency range
of 10MHz to 27MHz. The oscillator circuit is optimized for
parallel resonant mode, and will require external capacitance
• Maximum output frequency: 27MHz
• LVCMOS/LVTTL SEL0 and SEL1 inputs have
internal pulldown resistors
• LVPECL mode operating voltage supply range:
VCC = 3.135V to 3.465V, VEE = 0V
• ECL mode operating voltage supply range:
VCC = 0V, VEE = -3.135V to -3.465V
• 0°C to 70°C ambient operating temperature
• Industrial temperature information available upon request
BLOCK DIAGRAM
XTALIN0
XTALOUT0
XTALIN1
XTALOUT1
XTALIN2
XTALOUT2
XTALIN3
XTALOUT3
OSC
OSC
OSC
OSC
00
01
10
11
SEL1 SEL0
PIN ASSIGNMENT
VCC 1
20 VCC
XTALIN0 2 19 SEL1
XTALOUT0 3 18 SEL0
XTALIN1 4 17 VCC
XTALOUT1 5 16 Q0
XTALIN2 6 15 nQ0
XTALOUT2 7 14 VCC
XTALIN3 8 13 nc
XTALOUT3 9 12 nc
Q0
VEE 1 0 1 1 VEE
nQ0
ICS85357-11
20-Lead TSSOP
4.40mm x 6.50mm x 0.92mm body package
G Package
Top View
85357AG-11
www.icst.com/products/hiperclocks.html
1
RREV. C OCTOBER 7, 2004
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