ISP1520BD datasheet(11/51 Pages) PHILIPS

Part #	ISP1520BD

Description	Hi-Speed Universal Serial Bus hub controller

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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Philips Semiconductors

ISP1520

Hi-Speed USB hub controller

Product data

Rev. 02 — 04 May 2004

11 of 51

9397 750 11689

8.7 Power-on reset

The ISP1520 has an internal Power-On Reset (POR) circuit.

The triggering voltage of the POR circuit is 2.03 V nominal. A POR is automatically

generated when VCC goes below the trigger voltage for a duration longer than 1 µs.

At t1: clock is running and available.

Fig 3.

Power-on reset timing.

Stable external clock is to be available at A.

Fig 4.

External clock with respect to power-on reset.

004aaa388

t1

VCC

2.03 V

0 V

≤ 683 µs

POR

EXTERNAL CLOCK

A

004aaa365

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