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PCK942C Datasheet, PDF (1/11 Pages) NXP Semiconductors – Low voltage 1 : 18 clock distribution chip | |||
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PCK942C
Low voltage 1 : 18 clock distribution chip
Rev. 01 â 15 February 2006
Product data sheet
1. General description
The PCK942C is a 1 : 18 low voltage clock distribution chip with 2.5 V or 3.3 V LVCMOS
output capabilities. The device is offered in two versions: the PCK942C has an LVCMOS
input clock, while the PCK942P has an LVPECL input clock. The 18 outputs are 2.5 V or
3.3 V LVCMOS compatible and feature the drive strength to drive 50 ⦠series or parallel
terminated transmission lines. With output-to-output skews of 200 ps, the PCK942C is
ideal as a clock distribution chip for the most demanding of synchronous systems. The
2.5 V outputs also make the device ideal for supplying clocks for a higher performance
Pentium II microprocessor based design.
With a low output impedance of approximately 12 â¦, in both the HIGH and LOW logic
states, the output buffers of the PCK942C are ideal for driving series terminated
transmission lines. With an output impedance of 12 ⦠the PCK942C can drive two series
terminated transmission lines from each output. This capability gives the PCK942C an
effective fan-out of 1 : 36. The PCK942C provides enough copies of low skew clocks for
most high performance synchronous systems.
The LVCMOS/LVTTL input of the PCK942C provides a more standard LVCMOS interface.
The OE pin will place the outputs into a high-impedance state. The OE pin has an internal
pull-up resistor.
The PCK942C is a single supply device. The VCC power pins require either 2.5 V or 3.3 V.
The 32-lead LQFP package was chosen to optimize performance, board space, and cost
of the device. The 32-lead LQFP package has a 7 mm à 7 mm body size with a
conservative 0.8 mm pin spacing.
2. Features
s LVCMOS/LVTTL clock input
s 2.5 V LVCMOS outputs for Pentium II microprocessor support
s 150 ps maximum targeted output-to-output skew
s Maximum output frequency of 250 MHz @ 3.3 V VCC
s 32-lead LQFP packaging
s Single 3.3 V or 2.5 V supply voltage
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