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ISP1520

Hi-Speed Universal Serial Bus hub controller

Philips Electronics 

Philips Semiconductors

ISP1520

Hi-Speed USB hub controller

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.

VCC

2.03 V

POR

≤ 683 µs

0V

At t1: clock is running and available.

Fig 3. Power-on reset timing.

t1

004aaa388

POR

EXTERNAL CLOCK

A

Stable external clock is to be available at A.

Fig 4. External clock with respect to power-on reset.

004aaa365

9397 750 11689

Product data

Rev. 02 — 04 May 2004

© Koninklijke Philips Electronics N.V. 2004. All rights reserved.

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