isp1181 NXP Semiconductors, isp1181 Datasheet - Page 46

• Manufacturer Part Number: isp1181
• Description: Isp1181 Full-speed Universal Serial Bus Interface Device
• Manufacturer: NXP Semiconductors

Philips Semiconductors
16. Power-on reset
9397 750 08938
Product data
The ISP1181 has an internal power-on reset (POR) circuit. Input pin RESET can be
directly connected to V
power-on and normally requires 3 to 4 ms to stabilize.
The triggering voltage of the POR circuit is 2.0 V nominal. A POR is automatically
generated when V
A hardware reset disables all USB endpoints and clears all ECRs, except for the
control endpoint which is fixed and always enabled.
(re-)initialize the endpoints.
Fig 15. Power-on reset timing.
t
t
t
(1) Supply voltage (5 V or 3.3 V), connected externally to pin RESET.
1
2
3
: clock is running
: BUS_CONF pins are sampled
: registers are accessible
V CC
2.0 V
0 V
(1)
Rev. 04 — 30 October 2001
CC
goes below the trigger voltage for a duration longer than 50 s.
CC
50 s
POR
. The clock signal on output CLKOUT starts 0.5 ms after
350 s
t 1
1 ms
Section 9.3
t 2
© Koninklijke Philips Electronics N.V. 2001. All rights reserved.
Full-speed USB interface
1 ms
explains how to
ISP1181
MGT026
t 3
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