ICS85357-11 Datasheet, PDF (1/12 Pages) Integrated Circuit Systems – 4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V LVPECL / ECL MULTIPLEXER

Integrated
Circuit
Systems, Inc.
ICS85357-11
4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V
LVPECL / ECL MULTIPLEXER
GENERAL DESCRIPTION
The ICS85357-11 is a 4:1 or 2:1, Crystal
,&6
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 - 25MHz parallel
resonant crystals 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 multiplexer. The SEL1 lead is
the most significant line and the binary number applied to
the select pins will select the same numbered 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 - 25MHz. The oscillator circuit is optimized for
parallel resonant mode, and will require external capacitance
• Maximum output frequency up to 25MHz
• LVCMOS SEL0 and SEL1 inputs have internal pulldown
resistors
• Part-to-part skew: 150ps (maximum)
• Propagation delay: 2ns (maximum)
• LVPECL mode operating voltage supply range:
V_CC = 3.135V to 3.465V, V_EE = 0V
• ECL mode operating voltage supply range:
V_CC = 0V, V_EE = -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 10 11 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
REV. A JULY 25, 2001