pckep14-01 NXP Semiconductors, pckep14-01 Datasheet

pckep14-01

Manufacturer Part Number

pckep14-01

Description

Pckep14 2.5 V/3.3 V 1 5 Differential Ecl/pecl/hstl Clock Driver

Manufacturer

NXP Semiconductors

Datasheet

1.PCKEP14-01.pdf (15 pages)

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1. Description

2. Features

The PCKEP14 is a low skew 1-to-5 differential driver, designed with clock distribution

in mind, accepting two clock sources into an input multiplexer. The ECL/PECL input

signals can be either differential or single-ended (if the V

inputs can be used when the PCKEP14 is operating under PECL conditions.

The PCKEP14 speciﬁcally guarantees low output-to-output skew. Optimal design,

layout, and processing minimize skew within a device, and from device to device.

To ensure that the tight skew speciﬁcation is realized, both sides of any differential

output need to be terminated identically into 50

being used. If an output pair is unused, both outputs may be left open (unterminated)

without affecting skew.

The common enable (EN) is synchronous, outputs are enabled/disabled in the LOW

state. This avoids a runt clock pulse when the device is enabled/disabled, as can

happen with an asynchronous control. The internal ﬂip-ﬂop is clocked on the falling

edge of the input clock, therefore, all associated speciﬁcation limits are referenced to

the negative edge of the clock input.

The PCKEP14, as with most other ECL devices, can be operated from a positive V

supply in PECL mode. This allows the PCKEP14 to be used for high performance

clock distribution in +3.3 V or +2.5 V systems.

PCKEP14

2.5 V/3.3 V 1:5 differential ECL/PECL/HSTL clock driver

Rev. 01 — 30 October 2002

100 ps device-to-device skew

25 ps within device skew

400 ps typical propagation delay

Maximum frequency > 2 GHz (typical)

Contains temperature compensation

PECL and HSTL mode: V

NECL mode: V

LVDS input compatible

Open input default state.

= 0 V with V

= 2.375 V to 3.8 V with V

= 2.375 V to 3.8 V

resistors, even if only one output is

output is used). HSTL

= 0 V

Product data

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